MTB


Line plots across dimensions of each concept
Line plots across concepts
Tables

Table of contents



us-gaap:CommonStockValue

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:TierOneRiskBasedCapitalToRiskWeightedAssets
dei:LegalEntity

us-gaap:CapitalToRiskWeightedAssets
dei:LegalEntity

us-gaap:ComprehensiveIncomeNetOfTax
us-gaap:StatementEquityComponents

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxesPaidNet

us-gaap:InterestAndFeeIncomeLoansAndLeases

us-gaap:InterestExpense

us-gaap:InterestExpenseLongTermDebt

us-gaap:InterestIncomeExpenseNet

us-gaap:InterestPaidNet

us-gaap:MarketingAndAdvertisingExpense

us-gaap:NetIncomeLoss
us-gaap:StatementBusinessSegments

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax
us-gaap:InvestmentType
us-gaap:StatementEquityComponents

us-gaap:PreferredStockDividendsIncomeStatementImpact
us-gaap:ProductOrService
us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax
us-gaap:ProductOrService, us-gaap:AdjustmentsForNewAccountingPronouncements
us-gaap:ProductOrService, us-gaap:AdjustmentsForNewAccountingPronouncements, us-gaap:StatementBusinessSegments
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:ConsolidationItems
us-gaap:Revenues
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:Assets
us-gaap:ConsolidatedEntities

us-gaap:Liabilities
us-gaap:ConsolidatedEntities

us-gaap:LiabilitiesAndStockholdersEquity
us-gaap:ConsolidatedEntities

us-gaap:StockholdersEquity
us-gaap:ConsolidatedEntities
us-gaap:InvestmentType
us-gaap:StatementEquityComponents
dei:LegalEntity
us-gaap:TierOneRiskBasedCapital
us-gaap:ConsolidatedEntities
us-gaap:Cash
us-gaap:ConsolidatedEntities
us-gaap:CashAndCashEquivalentsAtCarryingValue
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:Land

us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:FurnitureAndFixturesGross

us-gaap:LeaseholdImprovementsGross

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:AmortizationOfIntangibleAssets

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:Goodwill
us-gaap:StatementBusinessSegments

us-gaap:FiniteLivedIntangibleAssetsNet
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:DeferredTaxAssetsLiabilitiesNet

us-gaap:OperatingLeaseRightOfUseAsset
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:EquitySecuritiesFvNi
us-gaap:FairValueByMeasurementFrequency
us-gaap:ConsolidatedEntities
us-gaap:OtherAssets

us-gaap:LongTermDebt
us-gaap:ConsolidatedEntities
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:StatementEquityComponents

us-gaap:OperatingLeaseLiability

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:StockholdersEquity
us-gaap:ConsolidatedEntities
us-gaap:InvestmentType
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapital

us-gaap:RetainedEarningsAccumulatedDeficit
us-gaap:Restatement, us-gaap:AdjustmentsForNewAccountingPronouncements

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:TreasuryStockValue

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:StatementBusinessSegments

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:RepaymentsOfLongTermDebt

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
us-gaap:IncomeTaxAuthority
us-gaap:UnrecognizedTaxBenefits
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument
mtb:AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesOptionAdjustedBasisSpreadOnVariableRate

mtb:CommonSharesOutstandingIncludingCommonStockIssuableAndUnvestedStockBasedCompensationAwards

mtb:DepreciationAndAmortization1
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation, us-gaap:TradingActivityByType
mtb:GainLossOnHedgedItemInFairValueHedge

mtb:ImpairedFinancingReceivableNonaccrualInterestIncome
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

mtb:IncomeAttributableToUnvestedStockBasedCompensationAwardsBasic

mtb:IncomeAttributableToUnvestedStockBasedCompensationAwardsDiluted

mtb:IncreaseDecreaseInEstimatedFairValueOfInterestRateContractsInAssetPosition

mtb:IncreaseDecreaseInEstimatedFairValueOfInterestRateContractsInLiabilityPosition
us-gaap:FairValueByFairValueHierarchyLevel
mtb:IncreaseDecreaseInFairValueOfNonrecurringFairValueMeasuredLoansForChargeOffsAndImpairmentReserves

mtb:InterestExpensesSavingsAndInterestCheckingDeposits
us-gaap:AdjustmentsForNewAccountingPronouncements
mtb:MerchantDiscountAndCreditCardFees
us-gaap:AdjustmentsForNewAccountingPronouncements, us-gaap:StatementBusinessSegments

mtb:NetChangeInAccruedInterestReceivablePayable

mtb:NetIncomeLossAvailableToCommonStockholdersBasicBeforeUnvestedStockBasedCompensationAwardsAdjustment

mtb:NetIncomeLossAvailableToCommonStockholdersDilutedBeforeUnvestedStockBasedCompensationAwardsAdjustment

mtb:NetIncreaseDecreaseInLoanServicingAdvances

mtb:NetIncreaseDecreaseInShortTermBorrowings
us-gaap:Restatement
mtb:NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification1
us-gaap:Restatement, us-gaap:StatementEquityComponents
us-gaap:AdjustmentsForNewAccountingPronouncements
mtb:NoninterestIncomeExpenseOtherOperatingIncomeLoss
us-gaap:AdjustmentsForNewAccountingPronouncements, us-gaap:StatementBusinessSegments

mtb:OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanActuarialLossRecognizedInNetPeriodicBenefitCostNetOfTax

mtb:OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanActuarialLossRecognizedInNetPeriodicBenefitCostTaxEffect

mtb:OtherComprehensiveIncomeLossNetYieldAdjustmentFromCashFlowHedgesBeforeTax
us-gaap:StatementEquityComponents

mtb:OtherComprehensiveIncomeLossNetYieldAdjustmentFromCashFlowHedgesNetOfTax

mtb:OtherComprehensiveIncomeLossNetYieldAdjustmentFromCashFlowHedgesTax

mtb:OtherComprehensiveIncomeLossReclassificationAdjustmentForRealizedGainsLossesIncludedInNetIncomeBeforeTax
us-gaap:InvestmentType

mtb:OtherComprehensiveIncomeLossReclassificationAdjustmentForRealizedGainsLossesIncludedInNetIncomeNetOfTax

mtb:OtherComprehensiveIncomeLossReclassificationAdjustmentForRealizedGainsLossesIncludedInNetIncomeTax

mtb:OtherComprehensiveIncomeReclassificationToIncomeOfUnrealizedHoldingLossesBeforeTax
us-gaap:InvestmentType

mtb:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnHeldToMaturitySecuritiesArisingDuringPeriodNetOfTax

mtb:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnHeldToMaturitySecuritiesArisingDuringPeriodTax

mtb:PaymentsToAcquireEquityAndOtherSecuritiesInvestments

mtb:ProceedsFromSaleOfEquityAndOtherSecuritiesInvestments
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
mtb:ReductionInEstimatedFairValueLossesOnHedgingInstruments
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
mtb:RevenuesFromSubservicing

mtb:ShareBasedCompensationExpenseNet
us-gaap:StatementEquityComponents

mtb:TaxableEquivalentAdjustment

mtb:UnvestedStockBasedCompensationAwards
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument
mtb:ValuationChargeRecognized

us-gaap:AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount

us-gaap:AllowanceForLoanAndLeaseLossesWriteoffsNet
us-gaap:FinancingReceivablePortfolioSegment

us-gaap:AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization

us-gaap:AmortizationOfMortgageServicingRightsMSRs

us-gaap:AssetImpairmentCharges
us-gaap:FinancialInstrument
us-gaap:AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesDiscountRate
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument
us-gaap:AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed

us-gaap:BrokerageCommissionsRevenue
us-gaap:AdjustmentsForNewAccountingPronouncements
us-gaap:AdjustmentsForNewAccountingPronouncements, us-gaap:StatementBusinessSegments
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
us-gaap:BusinessAcquisition, us-gaap:SubsequentEventType
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationStepAcquisitionEquityInterestInAcquireeFairValue1

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect

us-gaap:DebtAndEquitySecuritiesGainLoss

us-gaap:DebtSecuritiesUnrealizedGainLoss
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanInterestCost
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanServiceCost
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation, us-gaap:TradingActivityByType
us-gaap:DerivativeGainLossOnDerivativeNet
us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet

us-gaap:DividendsCommonStockCash
us-gaap:StatementEquityComponents

us-gaap:DividendsPreferredStockCash
us-gaap:StatementEquityComponents
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3

us-gaap:FederalDepositInsuranceCorporationPremiumExpense

us-gaap:FinancingReceivableAllowanceForCreditLossesRecovery
us-gaap:FinancingReceivablePortfolioSegment

us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs
us-gaap:FinancingReceivablePortfolioSegment

us-gaap:FinancingReceivableModificationsPostModificationRecordedInvestment2

us-gaap:FinancingReceivableModificationsPreModificationRecordedInvestment2
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:GainLossOnDerivativeInstrumentsHeldForTradingPurposesNet
us-gaap:DerivativeInstrumentRisk

us-gaap:GainsLossesOnSalesOfAssets
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:IncomeStatementLocation
us-gaap:IncomeLossFromEquityMethodInvestments

us-gaap:IncreaseDecreaseInDeposits

us-gaap:IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:FinancialInstrument
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:TradingActivityByType

us-gaap:IncreaseDecreaseInFinancialInstrumentsUsedInOperatingActivities

us-gaap:IncreaseDecreaseInLoansHeldForSale

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:InformationTechnologyAndDataProcessing

us-gaap:InterestAndDividendIncomeOperating

us-gaap:InterestExpenseForeignDeposits

us-gaap:InterestExpenseShortTermBorrowings

us-gaap:InterestExpenseTimeDeposits

us-gaap:InterestIncomeDomesticDeposits

us-gaap:InterestIncomeExpenseAfterProvisionForLoanLoss

us-gaap:InterestIncomeSecuritiesTaxExempt

us-gaap:InterestIncomeSecuritiesTaxable
us-gaap:IncomeStatementLocation
us-gaap:InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet

us-gaap:LaborAndRelatedExpense
us-gaap:ProductOrService, us-gaap:BusinessAcquisition
us-gaap:NoncashMergerRelatedCosts

us-gaap:NoninterestExpense

us-gaap:NoninterestIncome
us-gaap:AdjustmentsForNewAccountingPronouncements
us-gaap:AdjustmentsForNewAccountingPronouncements, us-gaap:StatementBusinessSegments

us-gaap:NoninterestIncomeOtherOperatingIncome

us-gaap:OccupancyNet

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax
us-gaap:InvestmentType
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsTax

us-gaap:OtherComprehensiveIncomeLossBeforeTax
us-gaap:InvestmentType
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossTax

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
us-gaap:InvestmentType

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax

us-gaap:OtherInterestAndDividendIncome

us-gaap:OtherNoninterestExpense

us-gaap:PaymentsForProceedsFromLoansAndLeases

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsForProceedsFromProductiveAssets

us-gaap:PaymentsOfDividendsPreferredStockAndPreferenceStock

us-gaap:PaymentsToAcquireAvailableForSaleSecurities

us-gaap:PaymentsToAcquireHeldToMaturitySecurities

us-gaap:PensionAndOtherPostretirementBenefitExpense

us-gaap:ProceedsFromInterestReceived

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities

us-gaap:ProceedsFromPaymentsForInInterestBearingDepositsInBanks

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities

us-gaap:ProvisionForLoanAndLeaseLosses
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:LongtermDebtType
us-gaap:RepaymentsOfSeniorDebt
dei:LegalEntity
us-gaap:RepaymentsOfSubordinatedDebt

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument
us-gaap:ServicingAssetAtAmortizedValueValuationAllowance

us-gaap:SuppliesAndPostageExpense

us-gaap:TradingGainsLosses

us-gaap:TransferToOtherRealEstate

us-gaap:TreasuryStockValueAcquiredCostMethod
us-gaap:StatementEquityComponents
us-gaap:DebtInstrumentRedemptionPeriod, us-gaap:DerivativeInstrumentRisk
us-gaap:UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument
us-gaap:ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisionsRecoveries

mtb:AccumulatedOtherComprehensiveIncomeLossIncomeTax

mtb:AverageAsset
us-gaap:StatementBusinessSegments
us-gaap:BusinessAcquisition
mtb:BusinessCombinationRecognizedIdentifiableAssetsAcquisitionOfDeposits
us-gaap:BusinessAcquisition, us-gaap:SubsequentEventType
us-gaap:BusinessAcquisition
mtb:BusinessCombinationRecognizedIdentifiableAssetsAcquisitionOfLoansOutstanding
us-gaap:BusinessAcquisition, us-gaap:SubsequentEventType

mtb:CapitalLeasesNetInvestmentInDirectFinancingLeasesGuaranteedResidualValuesOfLeasedProperty
us-gaap:InformationByCategoryOfDebtSecurity
mtb:CarryingValueOfAvailableForSaleSecuritiesPledged

mtb:CollateralizedMortgageObligationsAmortizedCost

mtb:CollateralizedMortgageObligationsEstimatedFairValue

mtb:CommitmentsRegardingCommercialLettersOfCredit

mtb:CommitmentsRegardingFinancialGuaranteesAndIndemnificationContracts

mtb:CommitmentsToExtendCreditForCommercialAndOther

mtb:CommitmentsToExtendCreditForCommercialRealEstateLoansToBeSold

mtb:CommitmentsToExtendCreditForHomeEquityLinesOfCredit

mtb:CommitmentsToExtendCreditForOtherCommercialRealEstate

mtb:CommitmentsToExtendCreditForOtherResidentialRealEstate

mtb:CommitmentsToExtendCreditForResidentialRealEstateLoansToBeSold

mtb:CommitmentsToExtendCreditToCommercialCustomers
us-gaap:FairValueByFairValueHierarchyLevel
mtb:CommitmentsToOriginateRealEstateLoansForSale
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByFairValueHierarchyLevel
mtb:CommitmentsToSellRealEstateLoansNet
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

mtb:CommitmentsToSellRealEstateLoansNotionalAmount
dei:LegalEntity
mtb:CommonEquityTierOneRiskBasedCapital

mtb:CommonEquityTierOneRiskBasedCapitalToRiskWeightedAssets
dei:LegalEntity

mtb:CommonEquityTierOneRiskBasedCapitalToWellCapitalizedToRiskWeightedAssets

mtb:CommonStockIssuable

mtb:DeferredTaxAssetsLossesOnLoansAndOtherAssets

mtb:DeferredTaxAssetsOperatingLeaseLiabilities

mtb:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementAndOtherEmployeeBenefits

mtb:DeferredTaxLiabilitiesInterestOnLoans

mtb:DeferredTaxLiabilitiesUnrealizedGainsOnInvestmentSecurities

mtb:DeferredTaxLiabilityDepreciationAndAmortization

mtb:DeferredTaxLiabilityGainsOnCashFlowHedges
us-gaap:RetirementPlanType
mtb:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeTax

mtb:DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitSensitivityRateIncreaseDecreaseDiscountRate

mtb:DerivativeHedgedLoans
us-gaap:DerivativeInstrumentRisk
mtb:DerivativeNotionalAmountToExpireInNextTwelveMonths
us-gaap:DerivativeInstrumentRisk
mtb:DerivativeNotionalAmountToExpireInYearFive
us-gaap:DerivativeInstrumentRisk
mtb:DerivativeNotionalAmountToExpireInYearThree
us-gaap:DerivativeInstrumentRisk
mtb:DerivativeNotionalAmountToExpireInYearTwo
us-gaap:ConsolidatedEntities
mtb:DueFromSubsidiaries
us-gaap:ConsolidatedEntities
mtb:DueFromSubsidiariesMoneyMarketSavings

mtb:EquityAndOtherSecuritiesAtCost

mtb:EquityAndOtherSecuritiesEstimatedFairValue

mtb:EquitySecuritiesGrossUnrealizedGains

mtb:EquitySecuritiesGrossUnrealizedLosses

mtb:FundsAvailableForPaymentOfDividendsToParentCompanyFromBankingSubsidiaries

mtb:HeldToMaturitySecuritiesDebtMaturitiesWithSingleMaturityDateNetCarryingAmount
us-gaap:FairValueByFairValueHierarchyLevel
mtb:InterestRateSwapAgreementsUsedForInterestRateRiskManagement
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

mtb:InvestmentInDebtSecuritiesAmortizedCost

mtb:InvestmentInDebtSecuritiesEstimatedFairValue

mtb:InvestmentInDebtSecuritiesGrossUnrealizedGains

mtb:InvestmentInDebtSecuritiesGrossUnrealizedLosses

mtb:InvestmentSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAggregateLosses

mtb:InvestmentSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue

mtb:InvestmentSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAggregateLosses

mtb:InvestmentSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue

mtb:InvestmentSecuritiesGrossUnrealizedLosses

mtb:InvestmentSecuritiesPledgedToSecureDebtCarryingValue
us-gaap:ConsolidatedEntities
mtb:InvestmentsInConsolidatedBankingSubsidiaries
us-gaap:ConsolidatedEntities
mtb:InvestmentsInConsolidatedOtherSubsidiaries
us-gaap:ConsolidatedEntities
mtb:InvestmentsInTrustPreferredEntities
us-gaap:FairValueByFairValueHierarchyLevel
mtb:LoansAndLeasesReceivableConsumerInstallmentRevolvingAndHomeEquity
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

mtb:LoansAndLeasesReceivableThirtyToEightyNineDaysPastDue
us-gaap:CreditFacility, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:ExtinguishmentOfDebt, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment
mtb:LoansServicedForOthersSoldWithCreditRecourse
us-gaap:StatementClassOfStock
mtb:LondonInterbankOfferedRatePlusBasisPoints

mtb:MaximumCreditRiskForRecourseAssociatedWithLoansSoldUnderFederalNationalMortgageAssociationDelegatedUnderwritingAndServicingProgram

mtb:MaximumExposureToLossOfInvestmentsInRealEstatePartnerships
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
mtb:MortgageLoansOfPrivatelyHeldCompany
us-gaap:FinancialInstrument
mtb:MortgageLoansServicedForOthers

mtb:NetInvestmentInDirectFinancingAndLeveragedTypeLeases

mtb:OtherAssetsForItsInvestmentInCommonSecuritiesRecognizedByCompanyOfVariousTrusts
us-gaap:FairValueByFairValueHierarchyLevel
mtb:OtherCreditRelatedCommitments
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis
us-gaap:RetirementPlanType
mtb:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNet

mtb:PercentageOfLoansInTheProcessOfForeclosureServicedByOtherEntitiesClassifiedAsGovernmentGuaranteed

mtb:ReadilyMarketableSecuritiesAtEstimatedFairValue

mtb:ReadilyMarketableSecuritiesAtFairValueAmortizedCost

mtb:ReadilyMarketableSecuritiesAtFairValueGrossUnrealizedGains

mtb:ReadilyMarketableSecuritiesAtFairValueGrossUnrealizedLosses

mtb:ResidentialMortgageLoansSecuredByResidentialRealEstateInProcessOfForeclosure

mtb:SavingsAndInterestCheckingDeposits
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

mtb:SecuritiesWithDisclosedRatingAmortizedCost
us-gaap:FinancialInstrument

mtb:SecuritiesWithDisclosedRatingEstimatedFairValue
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
mtb:SubServicedResidentialMortgageLoansOfPrivatelyHeldCompany

mtb:TradingAccount

mtb:UnfundedCommitmentsIncludesCarrryingAmountOfItsInvestments
us-gaap:IncomeTaxAuthority
mtb:UnrecognizedFederalStateAndLocalIncomeTaxBenefits
us-gaap:FinancialInstrument
mtb:WeightedAverageOptionAdjustedSpreadOverMarketImpliedForwardLondonInterbankOfferedRatesUsedToDetermineDiscountRate
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:AccruedInvestmentIncomeReceivable
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis
us-gaap:ConsolidatedEntities
us-gaap:AccruedLiabilitiesAndOtherLiabilities

us-gaap:AccumulatedOtherComprehensiveIncomeLossBeforeTax1
us-gaap:InvestmentType
us-gaap:StatementEquityComponents
us-gaap:RetirementPlanType
us-gaap:AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:AssetsFairValueDisclosure
us-gaap:FairValueByMeasurementFrequency

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue

us-gaap:AvailableForSaleSecuritiesDebtSecurities
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:FinancialInstrument

us-gaap:BuildingsAndImprovementsGross
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
us-gaap:BusinessAcquisition, us-gaap:SubsequentEventType
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities
dei:LegalEntity
us-gaap:Capital

us-gaap:CapitalLeasesFutureMinimumPaymentsReceivable

us-gaap:CapitalLeasesFutureMinimumPaymentsReceivableDueThereafter

us-gaap:CapitalLeasesFutureMinimumPaymentsReceivableInFiveYears

us-gaap:CapitalLeasesFutureMinimumPaymentsReceivableInFourYears

us-gaap:CapitalLeasesFutureMinimumPaymentsReceivableInThreeYears

us-gaap:CapitalLeasesFutureMinimumPaymentsReceivableInTwoYears

us-gaap:CapitalLeasesFutureMinimumPaymentsReceivableNextRollingTwelveMonths

us-gaap:CapitalLeasesNetInvestmentInDirectFinancingLeases

us-gaap:CapitalLeasesNetInvestmentInDirectFinancingLeasesDeferredIncome

us-gaap:CapitalLeasesNetInvestmentInDirectFinancingLeasesMinimumPaymentsToBeReceived

us-gaap:CapitalLeasesNetInvestmentInDirectFinancingLeasesUnguaranteedResidualValuesOfLeasedProperty

us-gaap:CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets

us-gaap:CashAndDueFromBanks
us-gaap:IncomeStatementLocation
us-gaap:CashFlowHedgesDerivativeInstrumentsAtFairValueNet
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesOutstandingBalance
us-gaap:FinancialInstrument
us-gaap:CollateralAlreadyPostedAggregateFairValue

us-gaap:CostMethodInvestments
us-gaap:LongtermDebtType
us-gaap:DebtInstrumentInterestRateEffectivePercentage

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
us-gaap:FinancialInstrument
us-gaap:LongtermDebtType
us-gaap:DebtWeightedAverageInterestRate

us-gaap:DeferredIncomeTaxLiabilities
us-gaap:BalanceSheetLocation
us-gaap:DeferredRevenue

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts

us-gaap:DeferredTaxLiabilitiesLeasingArrangements

us-gaap:DeferredTaxLiabilitiesMortgageServicingRights

us-gaap:DeferredTaxLiabilitiesOther
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
us-gaap:RetirementPlanType
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanBenefitObligation
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo

us-gaap:DefinedBenefitPlanFairValueOfPlanAssets
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanFundedStatusOfPlan

us-gaap:DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear

us-gaap:DefinedBenefitPlanUltimateHealthCareCostTrendRate1
us-gaap:DefinedBenefitPlanByPlanAssetCategories
us-gaap:DefinedBenefitPlanWeightedAverageAssetAllocations

us-gaap:Deposits

us-gaap:DepositsForeign
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis
us-gaap:StatementGeographical

us-gaap:DerivativeAssetFairValueOfCollateral
us-gaap:FairValueByMeasurementBasis, us-gaap:FinancialInstrument, us-gaap:HedgingDesignation
us-gaap:DerivativeAssetsLiabilitiesAtFairValueNet
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:FinancialInstrument
us-gaap:DerivativeAverageFixedInterestRate
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:TradingActivityByType
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:FinancialInstrument
us-gaap:DerivativeAverageVariableInterestRate
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:TradingActivityByType

us-gaap:DerivativeFairValueOfDerivativeAsset
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation
us-gaap:HedgingDesignation

us-gaap:DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral

us-gaap:DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral

us-gaap:DerivativeFairValueOfDerivativeLiability
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation
us-gaap:HedgingDesignation

us-gaap:DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
us-gaap:FinancialInstrument
us-gaap:DerivativeLiabilityFairValueOfCollateral
us-gaap:AwardType
us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized

us-gaap:EquitySecuritiesFvNiCost
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency, us-gaap:ValuationTechnique
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis
us-gaap:ShortTermDebtType

us-gaap:FederalFundsSold
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByMeasurementBasis
us-gaap:Range, us-gaap:LongtermDebtType
us-gaap:FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd

us-gaap:FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFixedRate

us-gaap:FederalHomeLoanBankStockAndFederalReserveBankStock

us-gaap:FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
us-gaap:CreditFacility, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:ExtinguishmentOfDebt, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:FinancingReceivableRecordedInvestmentCurrent
us-gaap:CreditFacility, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:ExtinguishmentOfDebt, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

us-gaap:FiniteLivedIntangibleAssetsGross
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FairValueByMeasurementFrequency
us-gaap:ForeclosedAssets

us-gaap:HeldToMaturitySecurities
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateNetCarryingAmount

us-gaap:HeldToMaturitySecuritiesFairValue
us-gaap:FinancialInstrument

us-gaap:ImpairedFinancingReceivableRelatedAllowance
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:ImpairedFinancingReceivableUnpaidPrincipalBalance

us-gaap:ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:InterestBearingDepositsInBanks
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:InterestPayableCurrentAndNoncurrent
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

us-gaap:InterestReceivableAndOtherAssets

us-gaap:Investments
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

us-gaap:JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
us-gaap:LongtermDebtType

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterRollingYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextRollingTwelveMonths

us-gaap:LettersOfCreditOutstandingAmount

us-gaap:LeveragedLeasesNetInvestmentInLeveragedLeasesDisclosureDeferredIncome

us-gaap:LeveragedLeasesNetInvestmentInLeveragedLeasesDisclosureDeferredTaxesArisingFromLeveragedLeases

us-gaap:LeveragedLeasesNetInvestmentInLeveragedLeasesDisclosureInvestmentInLeveragedLeasesNet

us-gaap:LeveragedLeasesNetInvestmentInLeveragedLeasesDisclosureRentalReceivablesNet

us-gaap:LeveragedLeasesNetInvestmentInLeveragedLeasesDisclosureResidualValueOfLeasedAssets
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:LiabilitiesFairValueDisclosure
us-gaap:FairValueByMeasurementFrequency
dei:LegalEntity
us-gaap:LineOfCredit
us-gaap:LongtermDebtType
us-gaap:LineOfCreditFacilityCurrentBorrowingCapacity
dei:LegalEntity
us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity

us-gaap:LoansAndLeasesReceivableAllowance

us-gaap:LoansAndLeasesReceivableDeferredIncome

us-gaap:LoansAndLeasesReceivableGrossCarryingAmount
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FairValueByMeasurementBasis, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
us-gaap:CreditFacility, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:ExtinguishmentOfDebt, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:LoansAndLeasesReceivableNetOfDeferredIncome

us-gaap:LoansAndLeasesReceivableNetReportedAmount
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis
us-gaap:GeographicDistribution
us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:LoansAndLeasesReceivableRelatedParties
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:LoansHeldForSaleFairValueDisclosure
us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:LoansReceivableFairValueDisclosure
us-gaap:FairValueByMeasurementFrequency
us-gaap:FinancialInstrument, us-gaap:FinancingReceivablePortfolioSegment
us-gaap:LoansReceivableHeldForSaleNetNotPartOfDisposalGroup

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:MortgageBackedSecuritiesHeldToMaturityFairValueDisclosure

us-gaap:NoninterestBearingDepositLiabilitiesDomestic
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

us-gaap:NotesReceivableGross
us-gaap:Collateral
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FairValueByMeasurementBasis, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:OtherAssetsFairValueDisclosure
us-gaap:FairValueByMeasurementFrequency

us-gaap:OtherInvestmentsAndSecuritiesAtCost

us-gaap:OtherLiabilities
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:OtherLiabilitiesFairValueDisclosure
us-gaap:FairValueByMeasurementFrequency

us-gaap:OtherLongTermDebt

us-gaap:OtherRealEstateAndForeclosedAssets
us-gaap:RetirementPlanType
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent
us-gaap:FinancialInstrument
us-gaap:PledgedFinancialInstrumentsNotSeparatelyReportedLoansReceivablePledgedForFederalHomeLoanBankDebt
us-gaap:FinancingReceivablePortfolioSegment

us-gaap:PreferredStockValue

us-gaap:RevenueRemainingPerformanceObligation
us-gaap:BusinessAcquisition
us-gaap:SaleOfStockPricePerShare
us-gaap:BusinessAcquisition, us-gaap:SubsequentEventType

us-gaap:SecuritiesHeldAsCollateralAtFairValue
us-gaap:FinancialInstrument
us-gaap:SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInDiscountRate
us-gaap:FinancialInstrument
us-gaap:SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInOtherAssumption
us-gaap:FinancialInstrument
us-gaap:SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInPrepaymentSpeed
us-gaap:FinancialInstrument
us-gaap:SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInDiscountRate
us-gaap:FinancialInstrument
us-gaap:SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInOtherAssumption
us-gaap:FinancialInstrument
us-gaap:SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInPrepaymentSpeed
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument
us-gaap:ServicingAssetAtAmortizedValue
us-gaap:FinancialInstrument
us-gaap:FinancialInstrument
us-gaap:ServicingAssetAtAmortizedValueFairValue
us-gaap:FinancialInstrument
us-gaap:ServicingAssetAtFairValueAmount
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1

us-gaap:ShortTermBorrowings

us-gaap:ShortTermDebtWeightedAverageInterestRate
us-gaap:ShortTermDebtType
us-gaap:LongtermDebtType
us-gaap:SubordinatedDebt
dei:LegalEntity
us-gaap:TierOneLeverageCapital

us-gaap:TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets

us-gaap:TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
dei:LegalEntity
us-gaap:TierOneLeverageCapitalToAverageAssets

us-gaap:TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets

us-gaap:TimeDeposits
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:TradingLiabilitiesFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:TradingSecurities
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementFrequency
us-gaap:IncomeTaxAuthority
us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
dei:LegalEntity
us-gaap:UnsecuredDebt
dei:LegalEntity, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType

Plots across concepts


IncomeStatement
Other Comprehensive Income Loss Net Of Tax
Expenses
Interest Expense
Balance Sheet
Finite Lived Intangible Assets Net
Assets
Operating Lease Right Of Use Asset
Current Assets
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents
NonCurrent Assets
Finite Lived Intangible Assets Net
PropertyPlantAndEquipmentNet
Accumulated Depreciation Depletion And Amortization Property Plant And Equipment
Liabilities
Operating Lease Liability
Noncurrent Liabilities
Long Term Debt
Stockholders Equity
Accumulated Other Comprehensive Income Loss Net Of Tax
CashFlow
Net Cash Provided By Used In Financing Activities
NetCashProvidedByUsedInOperatingActivities
Net Income Loss
NetCashProvidedByUsedInInvestingActivities
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInFinancingActivities
Net Cash Provided By Used In Financing Activities
Shares
Weighted Average Number Of Shares Outstanding Basic
DividendsAndRepurchase
Payments For Repurchase Of Common Stock
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Undiscounted Excess Amount
FiniteLivedIntangibleAssets
Finite Lived Intangible Assets Net
BanksAndOrInsurance
Interest And Dividend Income Operating
AssetsBanks
Property Plant And Equipment Net
LiabilitiesBanks
Short Term Borrowings

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:CommonStockValue ███████████████████████▃▃▃▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▁▁79.87179.87179.87179.87179.87179.87179.87179.87179.87179.87179.88379.88379.88479.88479.90979.9179.91179.91379.97379.97579.97979.98279.78266.63766.53166.45566.15766.0565.95665.69465.25865.09764.70964.47664.08863.70263.29463.23862.84262.80562.77760.19860.198NANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding █▁128.842128.669NA128.355128.333129.755NA132.999135.464137.92NA142.976144.998148.905NA151.691153.276154.949NA156.026158.341159.181NA133.376133.116132.769NA132.128131.828131.126NA130.265129.017128.636NA126.292125.897125.616NA124.86122.796119.852NA119.155118.878118.256
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic █▁128.671128.537NA128.285128.275129.696NA132.965135.433137.889NA142.822144.825148.688NA151.347152.857154.427NA155.493157.802158.734NA132.63132.356132.049NA131.265130.856130.212NA129.171128.252127.669NA125.819125.488125.22NA124.575122.181119.201NA118.32118.054117.765
us-gaap:EarningsPerShareBasic ▇▇▇▅▃▃█▇▇▇█▇▇▄▄▄▄▄▃▄▃▃▃▃▃▃▃▃▃▃▂▄▅▄▄▄▃▂▁▂▅▂▂▂▂▁3.413.333.51999999999999962.751.741.933.59999999999999963.473.343.353.743.543.262.242.01000000000000072.222.362.131.97999999999999952.11.981.741.631.941.991.661.92999999999999971.921.991.631.56999999999999942.132.562.02.18000000000000062.181.711.51.03000000000000021.322.431.591.59999999999999961.491.471.16
us-gaap:EarningsPerShareDiluted ▇▇▇▅▃▃█▇▇▇█▇▇▄▄▄▄▄▃▄▃▃▃▃▃▃▃▃▃▂▂▄▅▃▄▄▃▂▁▂▅▂▂▂▂▁3.413.333.51999999999999962.751.741.933.593.473.343.353.743.533.262.232.0099999999999992.212.352.121.98000000000000042.11.981.731.621.931.981.651.921.911.981.611.55999999999999962.112.551.982.172.171.711.51.02999999999999941.322.421.591.59000000000000071.481.461.15
us-gaap:TierOneRiskBasedCapitalToRiskWeightedAssets NANA6e-06NANANA6e-08NANANA6e-08NANANA6e-08NANANA6e-08NANANA6e-08NANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:TierOneRiskBasedCapitalToRiskWeightedAssets dei:LegalEntity mtb:MAndTNANA1.117e-05NANANA1.094e-07NANANA1.138e-07NANANA1.226e-07NANANA1.192e-07NANANA1.268e-07NANANA1.247e-07NANANA1.2e-07NANANA1.022e-07NANANA9.67e-08NANANA9.470000000000001e-08NANANA
 us-gaap:TierOneRiskBasedCapitalToRiskWeightedAssets dei:LegalEntity mtb:MAndTBankNANA1.09e-05NANANA1.034e-07NANANA1.0839999999999999e-07NANANA1.03e-07NANANA1.002e-07NANANA1.133e-07NANANA1.046e-07NANANA1.008e-07NANANA8.92e-08NANANA8.870000000000001e-08NANANA8.62e-08NANANA
 us-gaap:TierOneRiskBasedCapitalToRiskWeightedAssets dei:LegalEntity mtb:WilmingtonTrustNaNANA4.657e-05NANANA5.635e-07NANANA6.069e-07NANANA4.816e-07NANANA5.708e-07NANANA8.687e-07NANANA5.722e-07NANANA7.379e-07NANANA6.102e-07NANANA7.189e-07NANANA2.68e-07NANANA
us-gaap:CapitalToRiskWeightedAssets NANA8e-06NANANA8e-08NANANA8e-08NANANA8e-08NANANA8e-08NANANA8e-08NANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CapitalToRiskWeightedAssets dei:LegalEntity mtb:MAndTNANA1.3369999999999999e-05NANANA1.305e-07NANANA1.368e-07NANANA1.475e-07NANANA1.409e-07NANANA1.492e-07NANANA1.5210000000000002e-07NANANA1.507e-07NANANA1.339e-07NANANA1.3259999999999998e-07NANANA1.308e-07NANANA
 us-gaap:CapitalToRiskWeightedAssets dei:LegalEntity mtb:MAndTBankNANA1.262e-05NANANA1.199e-07NANANA1.272e-07NANANA1.24e-07NANANA1.17e-07NANANA1.335e-07NANANA1.306e-07NANANA1.296e-07NANANA1.184e-07NANANA1.213e-07NANANA1.226e-07NANANA
 us-gaap:CapitalToRiskWeightedAssets dei:LegalEntity mtb:WilmingtonTrustNaNANA4.672e-05NANANA5.65e-07NANANA6.11e-07NANANA4.854e-07NANANA5.757e-07NANANA8.765e-07NANANA5.779e-07NANANA7.46e-07NANANA6.183e-07NANANA7.295000000000001e-07NANANA2.7639999999999996e-07NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:ComprehensiveIncomeNetOfTax ▅▄▃▄▃█▄▆█▇█▆▅▃▃▄▅▄▂▄▅▅▂▄▃▃▁▃▄▃419.573371.803232.605303.009275.851685.335366.694512.731648.311614.814668.537501.633458.462250.034270.533378.089402.539351.996150.494336.446385.199399.966182.811334.43221.677270.11684.088247.503349.905267.915NANANANANANANANANANANANANANANANA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest ▆▆▇▄▁▂▇▇▇▇██▇▄▇▆▆▅▅▅▅▄▃▃▄▂▂▃▃▂605.628592.549620.522486.882312.368349.749652.19635.05625.544634.477699.394696.353654.624457.869628.69580.538596.381518.253510.12550.298530.178467.802411.039434.71453.527375.416380.879425.811427.866354.306NANANANANANANANANANANANANANANANA
us-gaap:IncomeTaxExpenseBenefit ▄▄▄▃▁▂▄▄▄▄▄▄▄▂█▆▅▄▄▅▅▄▃▄▄▃▃▃▃▃▂▄▅▃▄▄▃▂▁▂▃▂▂▂▂▁147.559145.3149.382114.74671.31480.927159.124154.969152.284151.735153.175170.262161.464105.259306.287224.615215.328169.326179.549200.314194.147169.274140.074154.309166.839133.803142.826136.542129.996113.252106.236149.391182.219141.223149.247152.966118.861101.95455.16281.974125.605102.38102.31994.61990.96768.723
us-gaap:IncomeTaxesPaidNet ▆▃▃▆▃▃▃▄▄▅▆▃▅▃▃▅█▃▅▃▆▁▃▅▅▄▄▅▆▃▄▅▇▃▅▄▆▃▂▃▆▄▄▄▅▃180.03924.2221.087192.71217.09944.6618.07259.03793.856149.548177.86921.628137.6237.99932.042141.057291.83429.272138.49133.014191.507-86.1465.644147.909136.52988.57882.291131.593193.2394.78957.891104.711216.8619.545133.09668.253195.8338.416-56.24741.817189.07177.16972.83769.701130.95214.25
us-gaap:InterestAndFeeIncomeLoansAndLeases ▅▆▆▆▆▇▇████▇▇▆▆▆▅▅▅▅▅▅▄▂▂▂▂▂▂▂▂▂▃▂▂▂▂▂▂▂▁▁▁▁▁▁926.965972.582991.266956.594980.3721046.8211079.031119.6621125.5771117.9131099.2891060.8321024.471979.969966.527953.662924.64898.038882.842871.345867.478863.385796.247672.092662.633647.179659.055647.28645.029645.222663.376683.482705.395682.455693.627687.466674.549648.514648.707655.581624.247594.032605.837603.199596.919588.127
us-gaap:InterestExpense ▁▁▂▂▃▆▇██▇▆▆▅▄▄▄▄▄▄▄▄▄▄▃▃▃▃▃▃▃▃▃▃▃▃▃▄▄▄▄▄▄▄▅▅▅28.01835.56749.6158.06675.105143.614177.069199.579196.432176.249161.321138.337120.118106.633102.689100.07692.21391.773107.137111.175106.802100.8795.33377.19977.22678.49974.77273.96465.17666.51967.98269.57872.6273.92577.93182.12989.40393.70697.969103.632102.05198.679108.628116.032117.557120.052
us-gaap:InterestExpenseLongTermDebt ▁▁▂▂▃▄▅▆▇██▇▆▆▅▅▅▅▆▇▆▆▇▇▇▇▇▆▅▅▅▅▆▆▆▆▇▇▇▇▇▇▇███14.86516.86619.52720.90228.60540.29849.43756.21466.01267.57970.50866.04958.09353.90650.49847.50644.70846.6656.20358.84958.07757.88864.00262.07662.6464.04859.14958.05349.60450.44149.39149.11250.72950.75151.22953.74859.10561.21560.69562.5261.3759.28164.33969.97668.51868.745
us-gaap:InterestIncomeExpenseNet ▆▇▇▆▇▇▇█████▇▇▇▇▆▆▅▅▅▅▄▃▃▂▃▃▃▂▃▃▃▂▃▂▂▂▂▂▁▁▁▁▁▁942.34981.395989.28943.095957.137976.8051008.8331029.891041.4811050.061058.961029.0381008.787975.517971.45957.134938.2914.26875.764858.34863.819871.964807.044692.827683.128659.588681.84669.059669.114656.433666.484673.108677.587656.05667.422662.722647.983620.389618.031616.719586.202568.804574.097569.868567.227556.334
us-gaap:InterestPaidNet ▁▂▂▄▂▆▆█▆▇▅▆▄▄▄▄24.46355.37853.21295.20565.013158.861158.496216.112169.87191.309135.093162.406100.389118.34294.65111.019NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:MarketingAndAdvertisingExpense ▂▃▄▂▁▆█▆▇▅█▆▆▄▅▄▄▄▆▆▆▆13.36414.62817.83211.8559.84222.37527.06322.08824.04620.27525.9121.78421.76816.24819.36617.40316.32416.1121.07421.99622.61321.454NANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLoss ▆▆▇▅▃▃▇▇▇▇██▇▅▄▅▅▅▄▅▄▄▃▃▃▃▃▃▃▂▂▄▅▃▄▄▃▂▁▂▄▂▂▂▂▁458.069447.249471.14372.136241.054268.822493.066480.081473.26482.742546.219526.091493.16352.61322.403355.923381.053348.927330.571349.984336.031298.528270.965280.401286.688241.613277.549275.344284.336229.017221.422294.479348.466274.113296.193293.462233.38206.463147.74183.108322.358206.273204.442192.015188.749150.955
us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic ▆▆▇▅▃▃▇▇▇▇██▇▅▄▅▅▅▄▄▄▄▃▃▃▃▃▃▃▂▂▄▅▃▄▄▃▂▁▂▄▂▂▂▂▁438.756428.091451.863353.399223.098250.701473.381461.41452.632462.086525.331505.363472.598332.748302.492335.801360.658328.562307.789326.992312.968275.744248.062257.337263.471218.83254.224251.905260.68211.72203.485275.336328.538255.079276.569273.885214.709188.236129.802164.668297.164190.113189.015176.78173.588136.428
us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted ▆▆▇▅▃▃▇▇▇▇██▇▅▄▅▅▅▄▄▄▄▃▃▃▃▃▃▃▂▂▄▅▃▄▄▃▂▁▂▄▂▂▂▂▁438.759428.093451.864353.4223.099250.701473.382461.41452.633462.086525.332505.365472.6332.749302.494335.804360.662328.567307.795326.998312.974275.748248.068257.346263.481218.837254.237251.917260.695211.731203.496275.356328.557255.096276.587273.896214.716188.241129.799164.671297.179190.121189.022176.789173.597136.431
us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax ▅▅▇▇▄▁█▂▄▅▃▄▂▆▄▅▆▅▃▄▃▄▄▄▆▂▃▂▅▄▅▆▄▃▅▅▄▅▄▄▅0.1450.5482.5452.733-0.051-2.9433.195-1.704-0.6750.275-0.816-0.265-2.4341.29-0.2480.8631.150.476-0.767-0.229-1.565-0.053-0.404-0.0031.866-2.384-1.103-1.8170.449-0.1360.1761.251-0.114-0.9320.1680.482-0.5330.402-0.3-0.6990.196NANANANANA
us-gaap:OtherComprehensiveIncomeLossNetOfTax ▃▃▁▃▄█▂▄▅▅▅▃▃▂▃▄▄▄▂▃▄▅▃▄▃▄▁▃▄▄▇▇▇▇▇▇▇▆▃▆▇-38.496-75.446-238.535-69.12734.797416.513-126.37232.65175.051132.072122.318-24.458-34.698-102.576-51.8722.16621.4863.069-180.077-13.53849.168101.438-88.15454.029-65.01128.503-193.461-27.84165.56938.898355.325324.188346.648288.424286.004341.236286.789231.646-16.168219.344291.11NANANANANA
 us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:InvestmentType us-gaap:SecuritiesInvestment▄▄▄▄▆█▅▅▇█▇▃▃▁-8.088-22.406-7.229-17.94834.95197.4487.85722.60569.85384.59181.275-30.381-36.733-100.684NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents mtb:AccumulatedOtherAdjustment█▁-47.215-66.229NANANANA-43.9516.991101.37545.19619.247-1.226-5.003-9.152-8.062-0.2570.1950.453-0.791-0.252-1.588-0.077NANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents us-gaap:AccumulatedDefinedBenefitPlansAdjustment██▁███▄▇▇▇█▇▇▇█▇▇▇█▇▇▇16.80713.189-166.0769.2878.8569.288-90.2783.0543.8232.28521.7967.1497.0387.269.7924.1654.3593.97212.4513.8473.4864.321NANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents us-gaap:AccumulatedGainLossNetCashFlowHedgeParentNANANA-60.466NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents us-gaap:AccumulatedOtherComprehensiveIncome▃▃▁▃▄█▂▄▅▅▅▃▃▂▃▄▄▄▂-38.496-75.446-238.535-69.12734.797416.513-126.37232.65175.051132.072122.318-24.458-34.698-102.576-51.8722.16621.4863.069-180.077NANANANANANANANANANANA133.90329.709-1.81814.311-10.18947.77453.40925.183-163.90836.236NANANANANANA
us-gaap:PreferredStockDividendsIncomeStatementImpact ▅▅▅▅▅▅▅▄▆▆▆▆▆▆▆▆▆▆███████████▂▂▁▁▁17.0517.0517.0517.0517.0517.07817.07716.10318.1318.1318.13118.1318.1318.1318.1318.1318.23718.23720.31720.31820.31720.31820.31720.31820.31720.31820.31820.44320.44314.67414.03213.36313.36213.363NANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ProductOrService us-gaap:DepositAccount▅▄▅▄▁▇██▇▆█▇▇▇▇█▇98.51892.77795.81791.35577.455106.161110.987111.092107.787103.112108.791108.647106.784105.115107.783109.356106.057NANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ProductOrService us-gaap:FiduciaryAndTrust█▇▆▆▆▅▆▄▅▂▃▃▃▂▂▁▁162.991156.022151.314149.937151.882148.751151.525143.915144.382132.786135.024133.545137.641131.375129.669124.9126.797NANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ProductOrService us-gaap:MortgageBanking▆▆▇█▇▅▄▆▃▂▂▁▂▁▂▂▁133.313138.754140.441153.267145.024127.909118.134137.004107.32195.31192.22988.40892.49987.30696.23596.73786.163NANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ProductOrService,us-gaap:AdjustmentsForNewAccountingPronouncements us-gaap:DepositAccount,us-gaap:AccountingStandardsUpdate201409▅▄▅▄▁▇██▇▆█▇▇▇98.51892.77795.81791.35577.455106.161110.987111.092107.787103.112108.791108.647106.784105.115NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
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  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
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us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents ▃▁▅▄▂▁▃█▁▁▅▂▂▁▃▂▂▁▂1410.4681259.9891552.7431489.2321354.8151298.1921436.3051819.0611271.6111267.261605.4391311.6111369.0941292.6641420.8881368.2521345.4781286.9621320.549NANANA1368.04NANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:Land NANA94.929NANANA96.118NANANA97.082NANANA98.077NANANA104.671NANANA105.435NANANA82.335NANANA84.22NANANA84.545NANANA86.12NANANA64.728NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:PropertyPlantAndEquipmentGross NANA1726.796NANANA1594.694NANANA1491.659NANANA1487.347NANANA1437.117NANANA1406.579NANANA1314.422NANANA1261.89NANANA1160.729NANANA1096.327NANANA886.399NANANA
 us-gaap:FurnitureAndFixturesGross us-gaap:PropertyPlantAndEquipmentByType mtb:OwnedAssetsNANA807.701NANANA739.724NANANA669.782NANANA676.665NANANA636.219NANANA614.591NANANA586.429NANANA547.824NANANA465.113NANANA436.203NANANA366.227NANANA
 us-gaap:FurnitureAndFixturesGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:AssetsHeldUnderCapitalLeasesNANA8.63NANANA14.232NANANA18.582NANANA18.039NANANA14.849NANANA12.019NANANA18.853NANANA17.703NANANA17.915NANANA9.407NANANA1.387NANANA
us-gaap:LeaseholdImprovementsGross NANA302.246NANANA262.438NANANA240.731NANANA239.956NANANA232.936NANANA229.919NANANA219.152NANANA208.947NANANA198.498NANANA198.379NANANA172.638NANANA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment NANA977.912NANANA890.697NANANA844.251NANANA840.896NANANA761.854NANANA739.897NANANA701.438NANANA628.37NANANA566.077NANANA514.892NANANA-450.562NANANA
 us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment us-gaap:PropertyPlantAndEquipmentByType mtb:OwnedAssetsNANA971.979NANANA882.272NANANA835.218NANANA830.832NANANA756.245NANANA732.315NANANA686.372NANANA617.228NANANA559.948NANANA512.399NANANA-449.571NANANA
 us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment us-gaap:PropertyPlantAndEquipmentByType us-gaap:AssetsHeldUnderCapitalLeasesNANA5.933NANANA8.425NANANA9.033NANANA10.064NANANA5.609NANANA7.582NANANA15.066NANANA11.142NANANA6.129NANANA2.493NANANA-0.991NANANA
us-gaap:AmortizationOfIntangibleAssets ▁▁▁▂▂▂▂▂▂▂▂▃▃▃▃▃▄▄▄▄▅▆▄▂▃▃▃▃▄▄▅▅▆▆▆▆▇███▇▆▆▆▇█2.7372.7383.1293.9143.9133.9134.3055.0885.0775.025.3596.1436.3886.6327.0257.8088.1138.429.0899.78711.41812.3199.5764.095.9656.7937.177.3589.23410.06210.43910.62812.50213.34313.86514.08515.90716.77417.16217.40114.7412.31413.26913.52614.83316.475
us-gaap:PropertyPlantAndEquipmentNet ███████▇▇▇▃▃▃▃▃▃▃▃▃▃▃▃▃▂▃▃▃▃▃▃▃▃▃▃▃▃▃▂▂▂▂▁▁1116.7031148.9411161.5581146.6811155.2811154.5581140.9241074.1811066.5111044.761647.408634.424637.809628.706646.451656.713673.552672.769675.263660.381658.216662.891666.682581.976590.567602.096612.984612.076625.006627.966633.52614.795595.536589.57594.652589.035592.498580.033581.435569.495567.107431.292435.837NANANA
us-gaap:Goodwill ███████████████████████▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁4593.1124593.1124593.1124593.1124593.1124593.1124593.1124593.1124593.1124593.1124593.1124593.1124593.1124593.1124593.1124593.1124593.1124593.1124593.1124593.1124593.1124593.1124593.1123513.3253513.3253524.6253524.6253524.6253524.6253524.6253524.6253524.6253524.6253524.6253524.6253524.6253524.6253524.6253524.6253524.6253524.6253524.6253524.625NANANA
us-gaap:FiniteLivedIntangibleAssetsNet ▁▁▁▁▂▂▂▂▃▃▃▃▄▄▄▅▅▆▆▆▇▇█▂▂▂▂8.6911.42714.16517.29421.20825.12129.03433.33938.42843.94747.06752.42658.56964.95771.58978.61486.42294.53597.655106.744116.531127.949140.26818.17922.26928.23435.027NANANA68.851NANANA115.763NANANA176.394NANANA125.917NANANA
us-gaap:DeferredTaxAssetsLiabilitiesNet NANA112.713NANANA77.017NANANA173.621NANANA171.256NANANA565.012NANANA707.084NANANA567.694NANANA583.187NANANA837.256NANANA1045.642NANANA523.913NANANA
us-gaap:OperatingLeaseRightOfUseAsset NANA412.674NANANA436.927392.324395.659392.847NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByFairValueHierarchyLevel,us-gaap:FairValueByMeasurementFrequency us-gaap:FairValueInputsLevel1,us-gaap:FairValueMeasurementsRecurring▄▃▃▄▃█▇▇▇▁▄▄71.91764.1563.12972.85667.888115.206100.637104.199109.37743.30171.98972.651NANA73.232NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByFairValueHierarchyLevel,us-gaap:FairValueByMeasurementFrequency us-gaap:FairValueInputsLevel2,us-gaap:FairValueMeasurementsRecurring▁▃▅▅▄▃▇█▇▆▄▃6.75417.64229.85628.32625.72318.95439.40445.90542.42433.28521.92817.478NANA27.724NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByMeasurementFrequency us-gaap:FairValueMeasurementsRecurring▁▁▃▃▃▆▇██▁▃▂78.67181.79292.985101.18293.611134.16140.041150.104151.80176.58693.91790.129NANA100.956NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:LongTermDebt ▁▁▂▃▄▄▄▄▅▆▆▇▆▆▆▆▅▅▇███████▆▆▅▄▃▃▃▃▂▂▃▄▄▄▅▅▅3499.4483498.5034382.1935458.8856321.2916321.4356986.1867002.5247655.5078476.0248444.9149140.2688382.3168591.0518141.438577.6457649.588087.6199493.83510211.1610328.75110341.03510653.85810174.28910175.91210509.1439006.9599061.3917391.9316251.1975108.875121.3265122.3985394.5634607.7584969.5365687.8686476.5266686.2266748.8577128.9167305.427840.151NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:StockholdersEquity ███▇▇▇▇▇▇▇▇▇▇▇█████████▅▅▄▄▄▄▄▃▃▃▃▃▂▂▂▂▂▂▁▁16720.30416446.50816187.28316101.01315945.10515815.79415716.64915779.81115691.82715587.52915460.19115436.08515577.88515709.69416250.81916318.05216283.53716213.10416486.62216340.97616471.51416355.05316173.28912921.93412667.99712528.30112335.89612333.31612168.75511886.86311305.53211016.20210716.3310422.95710202.5939945.5279629.9079428.6889271.2099375.1269244.1948507.5188357.695NANANA
us-gaap:CommonStockValue ███████████████████████▃▃▃▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▁▁79.87179.87179.87179.87179.87179.87179.87179.87179.87179.87179.88379.88379.88479.88479.90979.9179.91179.91379.97379.97579.97979.98279.78266.63766.53166.45566.15766.0565.95665.69465.25865.09764.70964.47664.08863.70263.29463.23862.84262.80562.77760.19860.198NANANA
us-gaap:AdditionalPaidInCapital ███████████████████████▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▂▂▁▁6620.5286611.156617.4046609.5736599.0696588.4076593.5396584.7056577.6036568.486579.3426585.4476579.3956572.2816590.8556598.0486604.936603.3556676.9486689.8126690.6716683.4996680.7683511.1823477.6113445.7073409.5063377.7143347.3143302.4023232.0143192.9813112.6663061.7833025.522951.2482874.5162857.5562828.9862814.1432800.0022367.5562398.615NANANA
us-gaap:RetainedEarningsAccumulatedDeficit ███▇▇▇▇▇▆▆▆▆▅▅▅▅▄▄▄▄▄▄▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▁▁▁▁▁▁14030.21513731.89313444.42813132.37412919.34512837.3912820.91612490.23312162.27811842.37111516.67211128.34310763.63810404.45810164.8049909.4159685.4789437.459222.4889021.9658801.3058596.7528430.5028273.7478107.5257934.827807.1197642.9957481.0777309.9127188.0047074.2876887.076645.1956477.2766286.7856098.0845969.2365867.1655823.9285745.2535534.9095426.701NANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▄▅▅▇██▄▅▅▃▂▁▁▂▃▄▃▃▃▅▅▄▄▄▄▄▄▆▆▆▅▄▄▄▄▄▃▃▃▄▄▄▄▄▄▄-176.974-138.478-63.032175.503244.63209.833-206.68-80.308-112.958-288.009-420.081-542.399-517.941-483.243-363.814-247.915-270.081-291.567-294.636-114.559-101.021-150.189-251.627-163.473-217.502-152.491-180.99412.46740.308-25.261-64.159-198.062-227.771-225.953-240.264-230.075-277.849-331.258-356.441-192.533-228.769-197.521-205.22-192.554-197.197-255.181
us-gaap:TreasuryStockValue ███████▇▇▆▆▅▄▃▃▂▂▂▁5084.5155089.0935142.7325147.6355149.1185150.9994822.5634546.2374247.9933848.1983528.8513048.4052560.2822096.8611454.2821254.7331050.141849.468431.796NANANANANANANANANANANANANANANANANANANA0.00.00.04.89867.445NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▅▇▆▃▅▁█▆▃▅▅▇▃▅▆▅536.974994.737664.122-6.012525.519-394.4421130.707746.6766.872413.306550.2351018.37537.063484.179716.069442.579NANANANANANANANANANANANANA561.098428.647-112.819-81.902698.39826.205-170.852105.616539.012486.749422.31992.525770.653426.244220.633375.171653.599
us-gaap:NetCashProvidedByUsedInInvestingActivities ▆▃▅▇▁▅█▅▆▆▅▇▇▆▇▇-50.625-8931.747-4043.489967.256-15091.885-3852.3634726.674-3418.808-852.12271.261-2946.781873.742911.518-248.531215.588514.539NANANANANANANANANANANANANA-3441.038-1641.444229.368-419.729-371.773-1334.436329.681-1372.249-1683.854-245.755-225.6261252.892-412.579221.7039.694291.668-47.655
us-gaap:NetCashProvidedByUsedInFinancingActivities ▃▆▄▃█▄▁▄▃▃▄▂▃▃▂▃-335.877644.2563442.878-826.82714622.9894108.692-6240.1373219.588789.599-1022.7462690.374-1949.6-872.151-363.873-1879.021-934.344NANANANANANANANANANANANANA2970.124825.978468.702150.066-487.1731671.91841.2681345.3721036.537-142.654-175.551-994.807-309.524-803.517-196.888-654.622-808.617
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:DeferredIncomeTaxExpenseBenefit ▃▃▄▂▂▂▃▃▃▃▄▃▃▁█▃▂▃▄▃▃▃█▃▃▃▃▃▃▃▃▄▃▃▃▄▃▃▃▃▂▃▃▄▃▃15.82439.32988.622-29.82-53.85-36.24340.8650.8662.37613.44189.26750.570.792-124.772390.864-7.21-19.59536.73164.73914.81644.38350.075376.455-9.743-7.16837.05259.071-7.187-1.29242.25646.55662.85611.1219.25323.15996.635-3.16115.22519.39432.731-29.63911.4381.95772.034-12.76-10.163
us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet ▄▄▄█▂▄▁▂▃▆▅▅▂▁▇▂▃▃▄▁▅▂▇▃▃▄▃▃▅▂▄▂▄▂▃▆▄▃▁▄▃▃▃▄▂▂22.89927.30174.667350.488-79.76673.363-151.494-69.15-26.59171.304112.042129.646-90.01-165.114312.119-59.478-50.8690.20953.546-145.989102.946-70.766300.339-50.703-40.58180.084-20.7036.608140.701-57.88443.877-95.06460.309-80.645-4.172169.28667.724-32.134-168.89245.193-21.703-2.063-24.97735.675-74.866-80.537
us-gaap:NetCashProvidedByUsedInOperatingActivities ▅▇▆▃▅▁█▆▃▅▅▇▃▅▆▅536.974994.737664.122-6.012525.519-394.4421130.707746.6766.872413.306550.2351018.37537.063484.179716.069442.579NANANANANANANANANANANANANA561.098428.647-112.819-81.902698.39826.205-170.852105.616539.012486.749422.31992.525770.653426.244220.633375.171653.599
us-gaap:NetIncomeLoss ▆▆▇▅▃▃▇▇▇▇██▇▅▄▅▅▅▄▅▄▄▃▃▃▃▃▃▃▂▂▄▅▃▄▄▃▂▁▂▄▂▂▂▂▁458.069447.249471.14372.136241.054268.822493.066480.081473.26482.742546.219526.091493.16352.61322.403355.923381.053348.927330.571349.984336.031298.528270.965280.401286.688241.613277.549275.344284.336229.017221.422294.479348.466274.113296.193293.462233.38206.463147.74183.108322.358206.273204.442192.015188.749150.955
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▆▃▅▇▁▅█▅▆▆▅▇▇▆▇▇-50.625-8931.747-4043.489967.256-15091.885-3852.3634726.674-3418.808-852.12271.261-2946.781873.742911.518-248.531215.588514.539NANANANANANANANANANANANANA-3441.038-1641.444229.368-419.729-371.773-1334.436329.681-1372.249-1683.854-245.755-225.6261252.892-412.579221.7039.694291.668-47.655
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▃▆▄▃█▄▁▄▃▃▄▂▃▃▂▃-335.877644.2563442.878-826.82714622.9894108.692-6240.1373219.588789.599-1022.7462690.374-1949.6-872.151-363.873-1879.021-934.344NANANANANANANANANANANANANA2970.124825.978468.702150.066-487.1731671.91841.2681345.3721036.537-142.654-175.551-994.807-309.524-803.517-196.888-654.622-808.617
us-gaap:RepaymentsOfLongTermDebt ▁▂▂▂▁▂▁▂▂▁▂▁▁▁▁▁▂▂▂▁▁▁█▁▁▁▁▁▁▁▁▁▁▁▁▂▂▁▁▁▂▁▂▁▂▁0.047852.9451059.982850.6161.302753.1230.96675.952875.4421.139751.4871.224202.178504.192404.12301.2611326.6491401.41692.863104.4445.404317.1878588.1661.283321.2281.79752.63313.2978.1352.2452.2751.759253.7183.46352.854720.774804.187202.35259.789418.879802.805528.5111116.628292.715853.506252.88
us-gaap:PaymentsOfDividendsCommonStock ███████▇▇▇▇█▅▄▄▅▄▅▄▄▄▄▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁141.747142.044141.908141.514141.52143.17145.171132.93134.442139.595139.002143.815115.247112.318112.236114.514114.086116.566108.849109.863111.179112.093.86893.87193.64793.63193.08192.98492.72892.40691.83191.67691.05490.78890.23688.03590.40589.04188.5488.45488.41784.71884.17884.03583.78783.303
us-gaap:PaymentsForRepurchaseOfCommonStock NANA0.00.00.0373.75282.21299.963401.984365.628499.834498.5475.096720.966224.214224.724224.894532.07337.334350.0154.0100.0NANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value7979797979797979797979797979797979797979797979666666666665656565646464636363626262606060
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.1

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value128128128128129132135137142144148151153154156158159133133132132131131130129128126125125124122119119118118
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value128128128128129132135137142144148151152154155157158132132132131130130129128127125125125124122119118118117
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3.413.333.522.751.741.933.63.473.343.353.743.543.262.242.012.222.362.131.982.11.981.741.631.941.991.661.931.921.991.631.572.132.562.02.182.181.711.51.031.322.431.591.61.491.471.16
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3.413.333.522.751.741.933.593.473.343.353.743.533.262.232.012.212.352.121.982.11.981.731.621.931.981.651.921.911.981.611.562.112.551.982.172.171.711.51.031.322.421.591.591.481.461.15
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Tier One Risk Based Capital To Risk Weighted Assets

us-gaap:TierOneRiskBasedCapitalToRiskWeightedAssets

us-gaap:TierOneRiskBasedCapitalToRiskWeightedAssets


Tier
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value6.00.060.060.060.060.06
Percentage of TierOneRiskBasedCapitalToRiskWeightedAssets100.0100.0100.0100.0100.0100.0

us-gaap:TierOneRiskBasedCapitalToRiskWeightedAssets dei:LegalEntity

mtb:MAndT


Tier
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value11.170.10940.11380.12260.11920.12680.12470.120.10220.09670.09470.0859
Percentage of TierOneRiskBasedCapitalToRiskWeightedAssets186.2182.3189.7204.3198.7211.30.00.00.00.00.00.0

mtb:MAndTBank


Tier
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value10.90.10340.10840.1030.10020.11330.10460.10080.08920.08870.08620.0796
Percentage of TierOneRiskBasedCapitalToRiskWeightedAssets181.7172.3180.7171.7167.0188.80.00.00.00.00.00.0

mtb:WilmingtonTrustNa


Tier
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value46.570.56350.60690.48160.57080.86870.57220.73790.61020.71890.268
Percentage of TierOneRiskBasedCapitalToRiskWeightedAssets776.2939.21011.5802.7951.31447.80.00.00.00.00.0

Capital To Risk Weighted Assets

us-gaap:CapitalToRiskWeightedAssets

us-gaap:CapitalToRiskWeightedAssets


Capital
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value8.00.080.080.080.080.08
Percentage of CapitalToRiskWeightedAssets100.0100.0100.0100.0100.0100.0

us-gaap:CapitalToRiskWeightedAssets dei:LegalEntity

mtb:MAndT


Capital
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value13.370.13050.13680.14750.14090.14920.15210.15070.13390.13260.13080.123
Percentage of CapitalToRiskWeightedAssets167.1163.1171.0184.4176.1186.50.00.00.00.00.00.0

mtb:MAndTBank


Capital
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value12.620.11990.12720.1240.1170.13350.13060.12960.11840.12130.12260.1171
Percentage of CapitalToRiskWeightedAssets157.8149.9159.0155.0146.2166.90.00.00.00.00.00.0

mtb:WilmingtonTrustNa


Capital
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value46.720.5650.6110.48540.57570.87650.57790.7460.61830.72950.2764
Percentage of CapitalToRiskWeightedAssets584.0706.2763.8606.8719.61095.60.00.00.00.00.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value41937123230327568536651264861466850145825027037840235115033638539918233422127084247349267
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating43.236.622.430.326.761.230.941.752.450.154.843.040.623.125.235.839.135.015.334.739.741.120.343.429.236.611.133.347.737.1

us-gaap:ComprehensiveIncomeNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value-38.496-75.446-238.535-69.12734416-126.37232175132122-24.458-34.698-102.576-51.8722213.069-180.077-13.53849101-88.15454-65.01128-193.461-27.8416538
Percentage of ComprehensiveIncomeNetOfTax-9.2-20.3-102.5-22.812.660.8-34.56.427.021.518.3-4.9-7.6-41.0-19.25.95.30.9-119.7-4.012.825.4-48.216.2-29.310.6-230.1-11.218.714.5
Percentage of InterestAndDividendIncomeOperating-4.0-7.4-23.0-6.93.437.2-10.72.714.110.810.0-2.1-3.1-9.5-4.82.12.10.3-18.3-1.45.110.4-9.87.0-8.63.9-25.6-3.78.95.4
Percentage of InterestAndDividendIncomeOperating us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value458447471372241268493480473482546526493352322355381348330349336298270280286241277275284229
Percentage of ComprehensiveIncomeNetOfTax109.2120.3202.5122.887.439.2134.593.673.078.581.7104.9107.6141.0119.294.194.799.1219.7104.087.274.6148.283.8129.389.4330.1111.281.385.5
Percentage of InterestAndDividendIncomeOperating47.244.045.437.223.424.041.639.038.239.444.845.143.732.630.033.737.034.733.636.134.630.730.036.437.732.736.737.138.731.7
Percentage of InterestAndDividendIncomeOperating us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value605592620486312349652635625634699696654457628580596518510550530467411434453375380425427354
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating62.458.359.748.630.331.255.051.750.551.757.359.758.042.358.554.957.951.551.956.854.648.145.656.559.650.950.357.358.349.0

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value14714514911471801591541521511531701611053062242151691792001941691401541661331421361291131061491821411491521181015581125102102949068
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating15.214.314.411.56.97.213.412.612.312.412.614.614.39.728.521.220.916.818.320.720.017.415.520.021.918.118.918.417.715.714.520.124.319.320.020.516.114.37.711.418.215.315.013.813.310.2

Income Taxes Paid Net

us-gaap:IncomeTaxesPaidNet

us-gaap:IncomeTaxesPaidNet


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value180242119217441859931491772113737321412912913833191-86.1465.64414713688821311934.789571042169.545133681958.416-56.2474118977726913014
Percentage of IncomeTaxesPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating18.62.42.019.21.74.01.54.87.612.214.61.912.23.53.013.328.32.914.13.419.7-8.90.619.218.012.010.917.726.30.77.914.128.91.317.99.226.61.2-7.95.827.511.610.710.219.12.1

Interest And Fee Income Loans And Leases

us-gaap:InterestAndFeeIncomeLoansAndLeases

us-gaap:InterestAndFeeIncomeLoansAndLeases


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value92697299195698010461079111911251117109910601024979966953924898882871867863796672662647659647645645663683705682693687674648648655624594605603596588
Percentage of InterestAndFeeIncomeLoansAndLeases100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating95.595.695.495.595.093.491.091.190.991.290.190.990.790.690.090.289.789.389.889.989.488.788.287.387.187.787.187.187.889.290.392.094.093.593.192.391.590.890.691.090.789.088.787.987.287.0

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value28354958751431771991961761611381201061021009291107111106100957777787473656667697273778289939710310298108116117120
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating2.93.54.85.87.312.814.916.215.914.413.211.910.69.99.69.58.99.110.911.511.010.410.610.010.210.69.910.08.99.29.39.49.710.110.511.012.113.113.714.414.814.815.916.917.217.7

Interest Expense Long Term Debt

us-gaap:InterestExpenseLongTermDebt

us-gaap:InterestExpenseLongTermDebt


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value14161920284049566667706658535047444656585857646262645958495049495050515359616062615964696868
Percentage of InterestExpenseLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating1.51.71.92.12.83.64.24.65.35.55.85.75.15.04.74.54.34.65.76.16.06.07.18.18.28.77.87.86.87.06.76.66.87.06.97.28.08.68.58.78.98.99.410.210.010.2

Interest Income Expense Net

us-gaap:InterestIncomeExpenseNet

us-gaap:InterestIncomeExpenseNet


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value9429819899439579761008102910411050105810291008975971957938914875858863871807692683659681669669656666673677656667662647620618616586568574569567556
Percentage of InterestIncomeExpenseNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating97.196.595.294.292.787.285.183.884.185.686.888.189.490.190.490.591.190.989.188.589.089.689.490.089.889.490.190.091.190.890.790.690.389.989.589.087.986.986.385.685.285.284.183.182.882.3

Interest Paid Net

us-gaap:InterestPaidNet

us-gaap:InterestPaidNet


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value245553956515815821616919113516210011894111
Percentage of InterestPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating2.55.45.19.56.314.213.417.613.715.611.113.98.910.98.810.5

Marketing And Advertising Expense

us-gaap:MarketingAndAdvertisingExpense

us-gaap:MarketingAndAdvertisingExpense


Marketing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value131417119.8422227222420252121161917161621212221
Percentage of MarketingAndAdvertisingExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating1.41.41.71.21.02.02.31.81.91.72.11.91.91.51.81.61.61.62.12.32.32.2

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value458447471372241268493480473482546526493352322355381348330349336298270280286241277275284229221294348274296293233206147183322206204192188150
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating47.244.045.437.223.424.041.639.038.239.444.845.143.732.630.033.737.034.733.636.134.630.730.036.437.732.736.737.138.731.730.139.746.437.639.739.431.628.920.625.446.830.929.928.027.622.3

us-gaap:NetIncomeLoss us-gaap:StatementBusinessSegments

mtb:BusinessBanking


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value4146353732464243434337312822342122253523252412302728212630323638
Percentage of NetIncomeLoss9.110.39.615.612.29.68.99.08.38.710.78.87.56.410.36.16.88.513.18.68.810.34.311.29.812.59.69.08.811.912.213.1
Percentage of InterestAndDividendIncomeOperating4.34.53.63.62.93.83.43.53.73.83.53.02.82.23.52.22.32.63.93.13.33.41.64.23.84.02.93.64.14.54.95.2
Percentage of InterestAndDividendIncomeOperating mtb:BusinessBanking0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

mtb:CommercialBanking


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value111122131111143132123132147126125109105112101102105101117108108969610110599999787107116112
Percentage of NetIncomeLoss24.227.435.346.153.527.626.127.428.125.635.630.827.732.330.829.431.433.943.538.737.739.934.637.037.143.644.933.025.039.239.238.4
Percentage of InterestAndDividendIncomeOperating11.412.113.110.812.810.810.010.812.711.211.610.410.311.210.410.610.910.413.114.114.213.112.713.714.313.813.513.111.614.715.615.1
Percentage of InterestAndDividendIncomeOperating mtb:CommercialBanking0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

mtb:CommercialRealEstateSegment


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-03-312012-12-312012-09-30
Value8671871071171311211171161121089787849590848090857980857875747579768475
Percentage of NetIncomeLoss18.915.923.444.443.727.325.724.322.122.930.727.322.924.228.925.725.027.033.330.427.833.130.928.626.632.634.327.027.928.425.9
Percentage of InterestAndDividendIncomeOperating8.97.08.710.410.510.79.89.610.010.010.09.28.58.49.79.38.78.310.011.110.510.911.310.610.310.310.310.710.511.310.2
Percentage of InterestAndDividendIncomeOperating mtb:CommercialRealEstateSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

mtb:DiscretionaryPortfolio


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value789097952529383939291931293312504639375.113105.954138.27914111025-8.0361.846-5.078-5.039
Percentage of NetIncomeLoss17.120.226.239.79.56.28.08.17.65.95.68.97.89.73.614.513.813.413.81.83.82.55.03.05.34.95.08.6-2.30.7-1.7-1.7
Percentage of InterestAndDividendIncomeOperating8.18.99.79.32.32.43.13.23.42.61.83.02.93.41.25.24.84.14.20.71.40.81.81.12.01.61.53.4-1.10.3-0.7-0.7
Percentage of InterestAndDividendIncomeOperating mtb:DiscretionaryPortfolio0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

mtb:ResidentialMortgageBanking


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value3049453724157.64212131514131314-4.528221917-1.121273112252719181234344044
Percentage of NetIncomeLoss6.611.112.215.59.23.31.62.72.53.14.23.83.64.3-1.46.65.95.7-0.47.59.713.24.59.19.78.58.24.39.812.513.715.2
Percentage of InterestAndDividendIncomeOperating3.14.94.53.62.21.30.61.11.11.41.41.31.31.5-0.52.42.11.8-0.12.73.64.31.63.43.82.72.51.74.64.75.56.0
Percentage of InterestAndDividendIncomeOperating mtb:ResidentialMortgageBanking0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

mtb:RetailBanking


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value8985858611013114014514114312396100819069716385646868178323229245351525558
Percentage of NetIncomeLoss19.519.122.935.941.027.429.730.126.929.035.027.126.323.527.319.921.321.231.623.124.028.564.411.911.313.011.118.314.819.118.819.9
Percentage of InterestAndDividendIncomeOperating9.28.48.58.49.810.711.311.812.112.711.49.19.78.19.27.27.46.59.58.49.09.323.64.44.44.13.37.36.97.27.57.8
Percentage of InterestAndDividendIncomeOperating mtb:RetailBanking0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AllOtherSegments


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
Value20-18.447-109.933-234.211-185.774-6.983-0.302-7.4242323-76.941-23.96715-1.4391.32-7.502-13.898-29.129-94.75-28.312-33.759-66.514-120.73-2.083-1.034-66.323-176.46-0.62263
Percentage of NetIncomeLoss4.6-4.1-29.5-97.2-69.1-1.5-0.1-1.54.54.8-21.8-6.74.2-0.40.4-2.1-4.1-9.8-35.0-10.1-11.8-27.5-43.5-0.8-0.4-29.0-79.7-0.218.1
Percentage of InterestAndDividendIncomeOperating2.2-1.8-11.0-22.7-16.6-0.6-0.0-0.62.02.1-7.1-2.31.5-0.10.1-0.8-1.4-3.0-10.5-3.7-4.4-9.0-16.0-0.3-0.1-9.2-24.0-0.18.4
Percentage of InterestAndDividendIncomeOperating us-gaap:AllOtherSegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss Available To Common Stockholders Basic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value438428451353223250473461452462525505472332302335360328307326312275248257263218254251260211203275328255276273214188129164297190189176173136
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating45.242.143.535.321.622.439.937.536.637.743.143.341.930.728.231.835.032.731.333.732.228.327.533.434.729.633.633.935.529.327.737.143.834.937.136.829.126.418.122.943.228.527.725.825.320.2

Net Income Loss Available To Common Stockholders Diluted

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value438428451353223250473461452462525505472332302335360328307326312275248257263218254251260211203275328255276273214188129164297190189176173136
Percentage of NetIncomeLossAvailableToCommonStockholdersDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating45.242.143.535.321.622.439.937.536.637.743.143.341.930.728.231.835.032.731.333.732.228.327.533.434.729.633.633.935.529.327.737.143.834.937.136.829.126.418.122.943.228.527.725.825.420.2

Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value145000.0548000.02545000.02733000.0-51000.0-2943000.03195000.0-1704000.0-675000.0275000.0-816000.0-265000.0-2434000.01290000.0-248000.0863000.01150000.0476000.0-767000.0-229000.0-1565000.0-53000.0-404000.0-3000.01866000.0-2384000.0-1103000.0-1817000.0449000.0-136000.0176000.01251000.0-114000.0-932000.0168000.0482000.0-533000.0402000.0-300000.0-699000.0196000.0
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating0.00.10.20.3-0.0-0.30.3-0.1-0.10.0-0.1-0.0-0.20.1-0.00.10.10.0-0.1-0.0-0.2-0.0-0.0-0.00.2-0.3-0.1-0.20.1-0.00.00.2-0.0-0.10.00.1-0.10.1-0.0-0.10.0

Other Comprehensive Income Loss Net Of Tax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value-38.496-75.446-238.535-69.12734416-126.37232175132122-24.458-34.698-102.576-51.8722213.069-180.077-13.53849101-88.15454-65.01128-193.461-27.8416538355324346288286341286231-16.168219291
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating-4.0-7.4-23.0-6.93.437.2-10.72.714.110.810.0-2.1-3.1-9.5-4.82.12.10.3-18.3-1.45.110.4-9.87.0-8.63.9-25.6-3.78.95.448.443.746.239.538.445.838.932.4-2.330.442.3

us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:InvestmentType

us-gaap:SecuritiesInvestment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-8.088-22.406-7.229-17.94834977.85722698481-30.381-36.733-100.684
Percentage of OtherComprehensiveIncomeLossNetOfTax21.029.73.026.0100.423.4-6.269.239.964.066.4124.2105.998.2
Percentage of InterestAndDividendIncomeOperating-0.8-2.2-0.7-1.83.48.70.71.85.66.96.7-2.6-3.3-9.3
Percentage of InterestAndDividendIncomeOperating us-gaap:SecuritiesInvestment0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents

mtb:AccumulatedOtherAdjustment


Other
Period End2021-06-302021-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-47.215-66.229-43.9516.9911014519-1.226-5.003-9.152-8.062-0.2570.1950.453-0.791-0.252-1.588-0.077
Percentage of OtherComprehensiveIncomeLossNetOfTax122.687.834.821.457.934.215.75.014.48.915.5-1.20.914.80.41.9-3.2-0.1
Percentage of InterestAndDividendIncomeOperating-4.9-6.5-3.70.68.23.71.6-0.1-0.4-0.8-0.8-0.00.00.0-0.1-0.0-0.2-0.0
Percentage of InterestAndDividendIncomeOperating mtb:AccumulatedOtherAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value1613-166.0769.2878.8569.288-90.2783.0543.8232.285217.1497.0387.269.7924.1654.3593.972123.8473.4864.321
Percentage of OtherComprehensiveIncomeLossNetOfTax-43.7-17.569.6-13.425.52.271.49.42.21.717.8-29.2-20.3-7.1-18.918.820.3129.4-6.9-28.47.14.3
Percentage of InterestAndDividendIncomeOperating1.71.3-16.00.90.90.8-7.60.20.30.21.80.60.60.70.90.40.40.41.30.40.40.4
Percentage of InterestAndDividendIncomeOperating us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Other
Period End2020-09-30
Value-60.466
Percentage of OtherComprehensiveIncomeLossNetOfTax87.5
Percentage of InterestAndDividendIncomeOperating-6.0
Percentage of InterestAndDividendIncomeOperating us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.0

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value-38.496-75.446-238.535-69.12734416-126.37232175132122-24.458-34.698-102.576-51.8722213.069-180.07713329-1.81814-10.189475325-163.90836
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.037.79.2-0.55.0-3.614.018.610.91013.816.5
Percentage of InterestAndDividendIncomeOperating-4.0-7.4-23.0-6.93.437.2-10.72.714.110.810.0-2.1-3.1-9.5-4.82.12.10.3-18.318.24.0-0.22.0-1.46.47.23.5-22.95.0
Percentage of InterestAndDividendIncomeOperating us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Preferred Stock Dividends Income Statement Impact

us-gaap:PreferredStockDividendsIncomeStatementImpact

us-gaap:PreferredStockDividendsIncomeStatementImpact


Preferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value17171717171717161818181818181818181820202020202020202020201414131313
Percentage of PreferredStockDividendsIncomeStatementImpact100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating1.81.71.61.71.71.51.41.31.51.51.51.61.61.71.71.71.81.82.12.12.12.12.32.62.72.82.72.82.82.01.91.81.81.8

Revenue From Contract With Customer Including Assessed Tax

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ProductOrService

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax

us-gaap:DepositAccount


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value9892959177106110111107103108108106105107109106
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating10.29.19.29.17.59.59.49.08.78.48.99.39.59.710.010.310.3
Percentage of InterestAndDividendIncomeOperating us-gaap:DepositAccount0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:FiduciaryAndTrust


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value162156151149151148151143144132135133137131129124126
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax165.4168.2157.9164.1196.1140.1136.5129.5134.0128.8124.1122.9128.9125.0120.3114.2119.6
Percentage of InterestAndDividendIncomeOperating16.815.314.615.014.713.312.811.711.710.811.111.412.212.112.111.812.3
Percentage of InterestAndDividendIncomeOperating us-gaap:FiduciaryAndTrust0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:MortgageBanking


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value1331381401531451271181371079592889287969686
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax135.3149.6146.6167.8187.2120.5106.4123.399.692.484.881.486.683.189.388.581.2
Percentage of InterestAndDividendIncomeOperating13.713.613.515.314.011.410.011.18.77.87.67.68.28.19.09.28.4
Percentage of InterestAndDividendIncomeOperating us-gaap:MortgageBanking0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ProductOrService, us-gaap:AdjustmentsForNewAccountingPronouncements

us-gaap:DepositAccount, us-gaap:AccountingStandardsUpdate201409


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value9892959177106110111107103108108106105
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating10.29.19.29.17.59.59.49.08.78.48.99.39.59.7
Percentage of InterestAndDividendIncomeOperating us-gaap:DepositAccount us-gaap:AccountingStandardsUpdate2014090.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:FiduciaryAndTrust, us-gaap:AccountingStandardsUpdate201409


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value162156151149151148151143144132135133137131
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax165.4168.2157.9164.1196.1140.1136.5129.5134.0128.8124.1122.9128.9125.0
Percentage of InterestAndDividendIncomeOperating16.815.314.615.014.713.312.811.711.710.811.111.412.212.1
Percentage of InterestAndDividendIncomeOperating us-gaap:FiduciaryAndTrust us-gaap:AccountingStandardsUpdate2014090.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ProductOrService, us-gaap:AdjustmentsForNewAccountingPronouncements, us-gaap:StatementBusinessSegments

us-gaap:DepositAccount, us-gaap:AccountingStandardsUpdate201409, mtb:BusinessBanking


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1212121111151515151515151515
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax13.113.512.612.614.614.413.813.614.114.714.314.514.614.7
Percentage of InterestAndDividendIncomeOperating1.31.21.21.21.11.41.31.21.21.21.31.41.41.4
Percentage of InterestAndDividendIncomeOperating us-gaap:DepositAccount us-gaap:AccountingStandardsUpdate201409 mtb:BusinessBanking0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DepositAccount, us-gaap:AccountingStandardsUpdate201409, mtb:CommercialBanking


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2424232222242323232323242424
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax25.326.224.225.029.122.821.021.121.422.521.422.222.723.5
Percentage of InterestAndDividendIncomeOperating2.62.42.22.32.22.22.01.91.91.91.92.12.12.3
Percentage of InterestAndDividendIncomeOperating us-gaap:DepositAccount us-gaap:AccountingStandardsUpdate201409 mtb:CommercialBanking0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DepositAccount, us-gaap:AccountingStandardsUpdate201409, mtb:CommercialRealEstateSegment


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2.8982.8932.5282.3472.5652.8122.5252.4152.3622.5262.2812.3742.4512.764
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.93.12.62.63.32.62.32.22.22.42.12.22.32.6
Percentage of InterestAndDividendIncomeOperating0.30.30.20.20.20.30.20.20.20.20.20.20.20.3
Percentage of InterestAndDividendIncomeOperating us-gaap:DepositAccount us-gaap:AccountingStandardsUpdate201409 mtb:CommercialRealEstateSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DepositAccount, us-gaap:AccountingStandardsUpdate201409, mtb:RetailBanking


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value5651565340616868656166646360
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax57.455.559.358.451.758.161.661.660.959.360.959.659.057.7
Percentage of InterestAndDividendIncomeOperating5.85.15.55.33.95.55.85.65.35.05.45.55.65.6
Percentage of InterestAndDividendIncomeOperating us-gaap:DepositAccount us-gaap:AccountingStandardsUpdate201409 mtb:RetailBanking0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DepositAccount, us-gaap:AccountingStandardsUpdate201409, us-gaap:AllOtherSegments


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1.1371.641.21.2861.0812.2721.4821.6641.4931.1141.3861.6281.4341.689
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.21.81.31.41.42.11.31.51.41.11.31.51.31.6
Percentage of InterestAndDividendIncomeOperating0.10.20.10.10.10.20.10.10.10.10.10.10.10.2
Percentage of InterestAndDividendIncomeOperating us-gaap:DepositAccount us-gaap:AccountingStandardsUpdate201409 us-gaap:AllOtherSegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:FiduciaryAndTrust, us-gaap:AccountingStandardsUpdate201409, mtb:BusinessBanking


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-03-31
Value0.00.00.0060.0120.010.0090.0070.0050.005
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.00.00.00.00.00.0
Percentage of InterestAndDividendIncomeOperating0.00.00.00.00.00.00.00.00.0
Percentage of InterestAndDividendIncomeOperating us-gaap:FiduciaryAndTrust us-gaap:AccountingStandardsUpdate201409 mtb:BusinessBanking0.00.00.00.00.00.00.00.00.0

us-gaap:FiduciaryAndTrust, us-gaap:AccountingStandardsUpdate201409, mtb:CommercialBanking


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-03-31
Value0.00.0010.1370.3040.2830.2420.2240.2140.214
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.20.30.30.20.20.20.2
Percentage of InterestAndDividendIncomeOperating0.00.00.00.00.00.00.00.00.0
Percentage of InterestAndDividendIncomeOperating us-gaap:FiduciaryAndTrust us-gaap:AccountingStandardsUpdate201409 mtb:CommercialBanking0.00.00.00.00.00.00.00.00.0

us-gaap:FiduciaryAndTrust, us-gaap:AccountingStandardsUpdate201409, us-gaap:AllOtherSegments


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value162156151149151148151143144132134133137131
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax165.4168.2157.9164.1195.9139.8136.3129.3133.7128.6123.3122.9128.9125.0
Percentage of InterestAndDividendIncomeOperating16.815.314.615.014.713.212.811.711.610.811.011.412.212.1
Percentage of InterestAndDividendIncomeOperating us-gaap:FiduciaryAndTrust us-gaap:AccountingStandardsUpdate201409 us-gaap:AllOtherSegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

mtb:BayviewLendingGroupAndBayviewFinancial


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2.02.03.02.02.03.03.03.03.03.03.04.04.04.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.02.23.12.22.62.82.72.72.82.92.83.73.73.8
Percentage of InterestAndDividendIncomeOperating0.20.20.30.20.20.30.30.20.20.20.20.30.40.4
Percentage of InterestAndDividendIncomeOperating mtb:BayviewLendingGroupAndBayviewFinancial0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Revenues

us-gaap:Revenues us-gaap:ConsolidationItems

us-gaap:Revenues

us-gaap:OperatingSegments


Revenuesus-gaap:
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-30
Value145514861463144415061557155315501488146614341416139913611349131212921132118010991120112510761150118610881108
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating150.0146.2146.2139.9134.4126.7125.5126.5127.5129.9132.5134.0135.8135.3139.2135.2132.9147.1155.2149.0150.8153.3148.9154.9158.1149.2148.8
Percentage of InterestAndDividendIncomeOperating us-gaap:OperatingSegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Revenues us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:IntersegmentElimination, mtb:BusinessBanking


Revenuesus-gaap:
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-30
Value0.7940.669-0.0010.1440.8850.9121.0040.8560.920.9120.9180.9191.0060.9111.0861.1970.9911.1671.1221.0451.0821.221.0571.2371.3191.1941.011
Percentage of Revenues0.10.0-0.00.00.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of InterestAndDividendIncomeOperating0.10.1-0.00.00.10.10.10.10.10.10.10.10.10.10.10.10.10.20.10.10.10.20.10.20.20.20.1
Percentage of InterestAndDividendIncomeOperating us-gaap:IntersegmentElimination mtb:BusinessBanking0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:IntersegmentElimination, mtb:CommercialBanking


Revenuesus-gaap:
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-30
Value1.0120.8090.1170.2491.0530.980.8870.840.8750.9280.850.840.8430.920.950.9111.0561.0971.0991.0851.2811.3561.1971.3831.3151.351.561
Percentage of Revenues0.10.10.00.00.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of InterestAndDividendIncomeOperating0.10.10.00.00.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.20.20.20.20.20.20.2
Percentage of InterestAndDividendIncomeOperating us-gaap:IntersegmentElimination mtb:CommercialBanking0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:IntersegmentElimination, mtb:CommercialRealEstateSegment


Revenuesus-gaap:
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-03-312012-09-30
Value0.230.222-0.0170.060.4090.4580.4060.3540.3710.3850.340.4010.3570.4070.4630.4490.3870.4690.4270.0820.4420.5250.3480.3991.5525.031
Percentage of Revenues0.00.0-0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.10.5
Percentage of InterestAndDividendIncomeOperating0.00.0-0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.10.10.00.10.10.00.10.20.7
Percentage of InterestAndDividendIncomeOperating us-gaap:IntersegmentElimination mtb:CommercialRealEstateSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:IntersegmentElimination, mtb:DiscretionaryPortfolio


Revenuesus-gaap:
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-30
Value-10.079-10.027-10.748-9.861-13.037-10.55-9.291-9.299-10.27-10.554-10.832-12.346-12.397-12.927-14.795-14.608-14.323-5.365-5.376-5.443-5.478-5.282-5.039-19.584-10.015-8.601-25.593
Percentage of Revenues-0.7-0.7-0.7-0.7-0.9-0.7-0.6-0.6-0.7-0.7-0.8-0.9-0.9-0.9-1.1-1.1-1.1-0.5-0.5-0.5-0.5-0.5-0.5-1.7-0.8-0.8-2.3
Percentage of InterestAndDividendIncomeOperating-1.0-1.0-1.1-1.0-1.2-0.9-0.8-0.8-0.9-0.9-1.0-1.2-1.2-1.3-1.5-1.5-1.5-0.7-0.7-0.7-0.7-0.7-0.7-2.6-1.3-1.2-3.4
Percentage of InterestAndDividendIncomeOperating us-gaap:IntersegmentElimination mtb:DiscretionaryPortfolio0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:IntersegmentElimination, mtb:ResidentialMortgageBanking


Revenuesus-gaap:
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-30
Value222222212119171415161518181822211912121112119.74815211828
Percentage of Revenues1.61.51.51.51.41.21.10.91.01.11.11.31.31.31.61.61.51.11.11.01.11.00.91.31.81.72.6
Percentage of InterestAndDividendIncomeOperating2.42.22.22.01.91.61.41.21.31.41.41.81.81.82.32.22.01.71.61.51.71.61.32.12.92.63.8
Percentage of InterestAndDividendIncomeOperating us-gaap:IntersegmentElimination mtb:ResidentialMortgageBanking0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:IntersegmentElimination, mtb:RetailBanking


Revenuesus-gaap:
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-30
Value0.2810.2720.2680.2670.2671.8082.7872.5112.8622.7072.8652.6683.0453.0473.0523.1323.0143.2923.2593.1373.7353.8973.5053.3513.5983.2572.841
Percentage of Revenues0.00.00.00.00.00.10.20.20.20.20.20.20.20.20.20.20.20.30.30.30.30.30.30.30.30.30.3
Percentage of InterestAndDividendIncomeOperating0.00.00.00.00.00.10.20.20.20.20.30.30.30.30.30.30.30.40.40.40.50.50.50.50.50.40.4
Percentage of InterestAndDividendIncomeOperating us-gaap:IntersegmentElimination mtb:RetailBanking0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:IntersegmentElimination, us-gaap:AllOtherSegments


Revenuesus-gaap:
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-30
Value-15.113-14.128-11.809-11.875-10.994-12.971-12.943-9.776-10.16-10.425-9.562-11.348-10.998-10.569-12.807-12.325-10.785-13.578-12.967-11.293-13.937-13.488-10.816-2.027-18.36
Percentage of Revenues-1.0-1.0-0.8-0.8-0.7-0.8-0.8-0.6-0.7-0.7-0.7-0.8-0.8-0.8-0.9-0.9-0.8-1.2-1.1-1.0-1.2-1.2-1.0-0.2-1.5
Percentage of InterestAndDividendIncomeOperating-1.6-1.4-1.2-1.2-1.0-1.1-1.0-0.8-0.9-0.9-0.9-1.1-1.1-1.1-1.3-1.3-1.1-1.8-1.7-1.5-1.9-1.8-1.5-0.3-2.4
Percentage of InterestAndDividendIncomeOperating us-gaap:IntersegmentElimination us-gaap:AllOtherSegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, mtb:BusinessBanking


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value145155158131138137141143140139143138136127130130124115136116114113114112111108108107104102108107106105114114
Percentage of Revenues10.010.50.09.09.69.20.09.29.19.00.09.39.38.90.09.28.98.50.08.68.78.80.09.99.49.90.09.69.39.50.09.49.09.70.010.3
Percentage of InterestAndDividendIncomeOperating15.015.315.313.113.412.311.911.711.411.411.711.912.011.812.212.312.111.513.812.011.811.712.714.614.614.714.314.514.314.214.814.514.214.415.415.3
Percentage of InterestAndDividendIncomeOperating us-gaap:OperatingSegments mtb:BusinessBanking0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, mtb:CommercialBanking


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value284285285276287291290282278267294280269266273267277273272268265253269270257246254249252248261257252249265255
Percentage of Revenues19.619.20.018.919.919.40.018.217.917.20.018.918.418.60.018.919.820.10.019.920.219.60.023.921.822.40.022.222.423.10.022.421.322.90.023.0
Percentage of InterestAndDividendIncomeOperating29.328.127.527.627.926.024.523.022.521.824.124.023.924.625.525.326.927.227.727.727.426.129.835.133.833.433.733.534.434.435.734.633.734.235.734.3
Percentage of InterestAndDividendIncomeOperating us-gaap:OperatingSegments mtb:CommercialBanking0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, mtb:CommercialRealEstateSegment


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-03-312012-12-312012-09-30
Value200200228202227223224238225219226214205202214212197195212205192177184181178163166170164158177171165173169
Percentage of Revenues13.813.50.013.915.714.80.015.314.514.10.014.414.014.10.015.014.114.30.015.214.613.70.016.015.214.90.015.214.614.70.014.915.20.015.3
Percentage of InterestAndDividendIncomeOperating20.719.722.020.322.019.918.919.418.217.918.618.418.218.720.020.119.119.421.721.219.818.220.523.623.522.122.023.022.421.924.223.022.623.222.8
Percentage of InterestAndDividendIncomeOperating us-gaap:OperatingSegments mtb:CommercialRealEstateSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, mtb:DiscretionaryPortfolio


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value1181341561401384960506063565358508465727847114988664132015291729242244-14.109121.3521.805
Percentage of Revenues8.19.00.09.69.63.30.03.33.94.10.03.64.03.50.04.65.15.80.08.57.56.70.01.21.71.40.01.62.72.30.03.8-1.21.10.00.2
Percentage of InterestAndDividendIncomeOperating12.213.215.114.013.44.45.14.14.95.24.64.55.24.67.86.27.07.84.911.810.18.97.11.82.72.13.92.44.13.43.05.9-1.91.60.20.2
Percentage of InterestAndDividendIncomeOperating us-gaap:OperatingSegments mtb:DiscretionaryPortfolio0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, mtb:ResidentialMortgageBanking


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value1461531391611421251171159683757982828790889363108103968999112111105110110949992111119138138
Percentage of Revenues10.110.30.011.09.88.30.07.46.25.40.05.35.65.70.06.46.36.90.08.07.97.50.08.89.510.10.09.89.88.80.08.09.411.00.012.5
Percentage of InterestAndDividendIncomeOperating15.115.113.416.113.811.29.99.47.86.86.26.87.37.68.28.58.69.36.411.210.710.09.912.914.715.114.014.815.113.113.612.514.916.418.618.6
Percentage of InterestAndDividendIncomeOperating us-gaap:OperatingSegments mtb:ResidentialMortgageBanking0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, mtb:RetailBanking


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value350346356351353402417432436430433427420393394392383361392353345339327308305300272274268261285314292291313318
Percentage of Revenues24.123.30.024.024.526.70.027.828.127.80.028.728.727.40.027.727.426.50.026.226.326.20.027.225.927.30.024.523.924.30.027.324.726.70.028.7
Percentage of InterestAndDividendIncomeOperating36.234.134.435.134.235.935.235.235.335.135.636.637.336.436.837.137.335.940.036.435.634.936.340.140.240.736.036.936.636.238.842.339.039.942.042.8
Percentage of InterestAndDividendIncomeOperating us-gaap:OperatingSegments mtb:RetailBanking0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, us-gaap:AllOtherSegments


Revenuesus-gaap:
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-30
Value209209200157275294315346294293311257254242182192225146194154194194132163248
Percentage of Revenues14.414.113.710.918.318.920.322.319.820.021.718.218.217.813.614.617.412.916.514.017.317.312.314.221.0
Percentage of InterestAndDividendIncomeOperating21.620.620.015.224.623.925.528.225.226.028.824.424.724.118.919.823.219.025.620.926.126.518.422.033.1
Percentage of InterestAndDividendIncomeOperating us-gaap:OperatingSegments us-gaap:AllOtherSegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value150622150481142601138626139536124577119872125500121554120025120097116827118426118622118593120401120896123223123449126841123820124625122787977979708098377966859722890835885308516284427832298281183008810858080779186779247786377727678816802168880
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidatedEntities

srt:ParentCompany


Assetsus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-31
Value17595170861680116819
Percentage of Assets12.314.314.014.2
Percentage of Assets12.314.314.014.2
Percentage of Assets srt:ParentCompany100.0100.0100.0100.0

us-gaap:VariableInterestEntityPrimaryBeneficiary


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value25002300230021002000160015001100
Percentage of Assets1.71.51.61.51.41.31.30.9
Percentage of Assets1.71.51.61.51.41.31.30.9
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities

us-gaap:Liabilities


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value133902134034126413122525123591108762104156109721105863104437104637101391102848102913102342104083104613107010106962110500107349108270106614848758441285849843498489578666766437385673411725127238972806711397117769758686536848868482593735966361127
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets88.989.188.688.488.687.386.987.487.187.087.186.886.886.886.386.486.586.886.687.186.786.986.886.887.087.387.287.386.686.686.787.087.187.487.787.788.188.188.188.088.187.587.788.7

us-gaap:Liabilities us-gaap:ConsolidatedEntities

srt:ParentCompany


Liabilitiesus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-31
Value140813691341568
Percentage of Liabilities1.11.31.30.6
Percentage of Assets1.01.11.10.5
Percentage of Assets srt:ParentCompany8.08.08.03.4

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value150622150481142601138626139536124577119872125500121554120025120097116827118426118622118593120401120896123223123449126841123820124625122787977979708098377966859722890835885308516284427832298281183008810858080779186779247786377727678816802168880
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilitiesAndStockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Liabilities
Period End2020-12-312019-12-312018-12-312017-12-31
Value17595170861680116819
Percentage of LiabilitiesAndStockholdersEquity12.314.314.014.2
Percentage of Assets12.314.314.014.2
Percentage of Assets srt:ParentCompany100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1672016446161871610115945158151571615779156911558715460154361557715709162501631816283162131648616340164711635516173129211266712528123351233312168118861130511016107161042210202994596299428927193759244850783577752
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets11.110.911.411.611.412.713.112.612.913.012.913.213.213.213.713.613.513.213.412.913.313.113.213.213.012.712.812.713.413.413.313.012.912.612.312.311.911.911.912.011.912.512.311.3

us-gaap:StockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Stockholders
Period End2020-12-312019-12-312018-12-312017-12-31
Value16187157161546016250
Percentage of StockholdersEquity100.0100.0100.0100.0
Percentage of Assets11.413.112.913.7
Percentage of Assets srt:ParentCompany92.092.092.096.6

us-gaap:StockholdersEquity us-gaap:InvestmentType

us-gaap:SecuritiesInvestment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-31
Value11412214415116913437296.918-62.935-147.526-228.801-198.42-161.687-44.15-16.31948
Percentage of StockholdersEquity0.70.70.90.91.10.90.20.20.0-0.4-1.0-1.5-1.3-1.0-0.3-0.10.3
Percentage of Assets0.10.10.10.10.10.10.00.00.0-0.1-0.1-0.2-0.2-0.1-0.0-0.00.0
Percentage of Assets us-gaap:SecuritiesInvestment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

mtb:AccumulatedOtherAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312014-12-312013-12-31
Value1592072739814213533-11.252-30.499-29.273-24.27-15.118-5.052-4.795-4.99-5.443-4.652-2.735-2.6060.097
Percentage of StockholdersEquity1.01.31.70.60.90.90.2-0.1-0.2-0.2-0.2-0.1-0.0-0.0-0.0-0.0-0.0-0.0-0.00.0
Percentage of Assets0.10.10.20.10.10.10.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.00.0
Percentage of Assets mtb:AccumulatedOtherAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

mtb:CommonStockIssuable


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-312010-12-31
Value1.1791.1651.3441.3271.3081.2921.5661.5471.5261.5141.7261.7161.6911.6751.8471.8271.941.9212.1452.2242.2012.182.3642.3412.3322.312.6082.592.62.6162.9152.8892.862.8293.4734.0724.189
Percentage of StockholdersEquity0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.1
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets mtb:CommonStockIssuable0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312014-12-312013-12-31
Value-451.068-467.875-481.064-314.988-324.275-333.131-342.419-252.141-255.195-259.018-261.303-283.099-290.248-297.286-304.546-260.378-264.543-268.902-272.874-285.325-296.979-305.589-98.182
Percentage of StockholdersEquity-2.7-2.8-3.0-2.0-2.0-2.1-2.2-1.6-1.6-1.7-1.7-1.8-1.9-1.9-1.9-1.6-1.6-1.7-1.7-1.7-1.8-2.5-0.9
Percentage of Assets-0.3-0.3-0.3-0.2-0.2-0.3-0.3-0.2-0.2-0.2-0.2-0.2-0.2-0.3-0.3-0.2-0.2-0.2-0.2-0.2-0.2-0.3-0.1
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Stockholders
Period End2020-09-302020-06-302019-12-31
Value33839998
Percentage of StockholdersEquity2.12.50.6
Percentage of Assets0.20.30.1
Percentage of Assets us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-312010-12-31
Value-176.974-138.478-63.032175244209-206.68-80.308-112.958-288.009-420.081-542.399-517.941-483.243-363.814-247.915-270.081-291.567-294.636-114.559-101.021-150.189-251.627-163.473-217.502-152.491-180.9941240-25.261-64.159-198.062-227.771-225.953-240.264-356.441-205.22
Percentage of StockholdersEquity-1.1-0.8-0.41.11.51.3-1.3-0.5-0.7-1.8-2.7-3.5-3.3-3.1-2.2-1.5-1.7-1.8-1.8-0.7-0.6-0.9-1.6-1.3-1.7-1.2-1.50.10.3-0.2-0.6-1.8-2.1-2.2-2.4-3.8-2.5
Percentage of Assets-0.1-0.1-0.00.10.20.2-0.2-0.1-0.1-0.2-0.3-0.5-0.4-0.4-0.3-0.2-0.2-0.2-0.2-0.1-0.1-0.1-0.2-0.2-0.2-0.2-0.20.00.0-0.0-0.1-0.2-0.3-0.3-0.3-0.5-0.3
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-312010-12-31
Value6620661166176609659965886593658465776568657965856579657265906598660466036676668966906683668035113477344534093377334733023232319231123061302528282398
Percentage of StockholdersEquity39.640.240.941.141.441.742.041.741.942.142.642.742.241.840.640.440.640.740.540.940.640.941.327.227.527.527.627.427.527.828.629.029.029.429.730.528.7
Percentage of Assets4.44.44.64.84.75.35.55.25.45.55.55.65.65.55.65.55.55.45.45.35.45.45.43.63.63.53.53.53.73.73.83.83.73.73.63.63.5
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-312010-12-31
Value79797979797979797979797979797979797979797979796666666666656565656464646260
Percentage of StockholdersEquity0.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.60.60.60.60.60.60.70.7
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:PreferredStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-312010-12-31
Value125012501250125012501250125012501231123112311231123112311231123112311231123112311231123112311231123112311231123112311231881879876874872864740
Percentage of StockholdersEquity7.57.67.77.87.87.98.07.97.87.98.08.07.97.87.67.57.67.67.57.57.57.57.69.59.79.810.010.010.110.47.88.08.28.48.69.38.9
Percentage of Assets0.80.80.90.90.91.01.01.01.01.01.01.11.01.01.01.01.01.01.01.01.01.01.01.31.31.31.31.31.41.41.01.01.11.11.11.11.1
Percentage of Assets us-gaap:PreferredStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-312010-12-31
Value1403013731134441313212919128371282012490121621184211516111281076310404101649909968594379222902188018596843082738107793478077642748173097188707468876645647758675426
Percentage of StockholdersEquity83.983.583.181.681.081.281.679.277.576.074.572.169.166.262.560.759.558.255.955.253.452.652.164.064.063.363.362.061.561.563.664.264.363.863.563.364.9
Percentage of Assets9.39.19.49.59.310.310.710.010.09.99.69.59.18.88.68.28.07.77.57.17.16.96.98.58.48.18.17.98.28.38.48.48.38.07.87.58.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312010-12-31
Value-5084.515-5089.093-5142.732-5147.635-5149.118-5150.999-4822.563-4546.237-4247.993-3848.198-3528.851-3048.405-2560.282-2096.861-1454.282-1254.733-1050.141-849.468-431.796-569.941-233.121-88.671-67.445
Percentage of StockholdersEquity-30.4-30.9-31.8-32.0-32.3-32.6-30.7-28.8-27.1-24.7-22.8-19.7-16.4-13.3-8.9-7.7-6.4-5.2-2.6-3.5-1.4-0.5-0.8
Percentage of Assets-3.4-3.4-3.6-3.7-3.7-4.1-4.0-3.6-3.5-3.2-2.9-2.6-2.2-1.8-1.2-1.0-0.9-0.7-0.3-0.4-0.2-0.1-0.1
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Tier One Risk Based Capital

us-gaap:TierOneRiskBasedCapital dei:LegalEntity

us-gaap:TierOneRiskBasedCapital

mtb:MAndT


Tier
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value118731130311193119081208312008964487927810692660515514
Percentage of TierOneRiskBasedCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets8.39.49.310.09.89.810.010.39.48.98.98.0
Percentage of Assets mtb:MAndT0.00.00.00.00.00.00.00.00.00.00.00.0

mtb:MAndTBank


Tier
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value11550106491063699781011510680804373416767628354064988
Percentage of TierOneRiskBasedCapital97.394.295.083.883.788.983.483.586.790.789.390.5
Percentage of Assets8.18.98.98.48.28.78.38.68.28.17.97.2
Percentage of Assets mtb:MAndTBank0.00.00.00.00.00.00.00.00.00.00.00.0

mtb:WilmingtonTrustNa


Tier
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value630606585529496476435420405393190
Percentage of TierOneRiskBasedCapital5.35.45.24.54.14.04.54.85.25.73.1
Percentage of Assets0.40.50.50.40.40.40.50.50.50.50.3
Percentage of Assets mtb:WilmingtonTrustNa0.00.00.00.00.00.00.00.00.00.00.0

Cash

us-gaap:Cash us-gaap:ConsolidatedEntities

us-gaap:Cash

srt:ParentCompany


Cashus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-31
Value100834013
Percentage of Cash100.0100.0100.0100.0
Percentage of Assets0.10.10.00.0
Percentage of Assets srt:ParentCompany0.60.50.20.1

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue us-gaap:ConsolidatedEntities

us-gaap:CashAndCashEquivalentsAtCarryingValue

srt:ParentCompany


Cash
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value80096089716291782885
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0
Percentage of Assets0.60.80.71.41.40.7
Percentage of Assets srt:ParentCompany4.55.65.39.70.00.0

us-gaap:CashAndCashEquivalentsAtCarryingValue us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1


Cash
Period End2021-06-302021-03-312020-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value129112131497125812161112127611931291131112961444183516891596199214121764189515481343
Percentage of CashAndCashEquivalentsAtCarryingValue0.00.0187.20.00.00.0144.20.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets0.90.81.11.01.00.91.01.21.31.31.31.52.01.91.92.41.72.12.31.91.7
Percentage of Assets us-gaap:FairValueInputsLevel10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:FairValueInputsLevel2


Cash
Period End2021-06-302021-03-312020-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value1184555736765915559547679827376666161917479
Percentage of CashAndCashEquivalentsAtCarryingValue0.00.06.90.00.00.010.30.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets0.10.00.00.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of Assets us-gaap:FairValueInputsLevel20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CashAndCashEquivalentsAtCarryingValue us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

us-gaap:FairValueInputsLevel1, us-gaap:EstimateOfFairValueFairValueDisclosure


Cash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value149714371307125613941765121411941528123212581206135212901251121312491276
Percentage of CashAndCashEquivalentsAtCarryingValue187.20.00.00.0145.30.00.00.0170.30.00.00.083.00.00.00.070.1144.2
Percentage of Assets1.11.00.91.01.21.41.01.01.31.11.11.01.11.11.01.01.01.0
Percentage of Assets us-gaap:FairValueInputsLevel1 us-gaap:EstimateOfFairValueFairValueDisclosure0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure


Cash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value5551474137535672777911086687793737091
Percentage of CashAndCashEquivalentsAtCarryingValue6.90.00.00.03.90.00.00.08.60.00.00.04.20.00.00.04.010.3
Percentage of Assets0.00.00.00.00.00.00.00.10.10.10.10.10.10.10.10.10.10.1
Percentage of Assets us-gaap:FairValueInputsLevel2 us-gaap:EstimateOfFairValueFairValueDisclosure0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CashAndCashEquivalentsAtCarryingValue us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value141012581552148913541298143218181271126716051311136912921420136813451286132013321284117813681249135013661373152319171763167220591986
Percentage of CashAndCashEquivalentsAtCarryingValue0.00.0194.10.00.00.0149.20.00.00.0178.90.00.00.087.20.00.00.074.10.00.00.0154.60.00.00.00.00.00.00.00.00.00.0
Percentage of Assets0.90.81.11.11.01.01.21.41.01.11.31.11.21.11.21.11.11.01.11.11.00.91.11.31.41.41.41.62.12.02.02.42.4
Percentage of Assets us-gaap:CarryingReportedAmountFairValueDisclosure0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:EstimateOfFairValueFairValueDisclosure


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value141012581552148913541298143218181271126716051311136912921420136813451286132013321284117813681249135013661373152319171763167220591986
Percentage of CashAndCashEquivalentsAtCarryingValue0.00.0194.10.00.00.0149.20.00.00.0178.90.00.00.087.20.00.00.074.10.00.00.0154.60.00.00.00.00.00.00.00.00.00.0
Percentage of Assets0.90.81.11.11.01.01.21.41.01.11.31.11.21.11.21.11.11.01.11.11.00.91.11.31.41.41.41.62.12.02.02.42.4
Percentage of Assets us-gaap:EstimateOfFairValueFairValueDisclosure0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value14101259155214891354129814361819127112671605131113691292142013681345128613201368
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.90.81.11.11.01.01.21.41.01.11.31.11.21.11.21.11.11.01.11.1

Land

us-gaap:Land

us-gaap:Land


Land
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value94969798104105828484866463
Percentage of Land100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.1

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:PropertyPlantAndEquipmentGross


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value1726159414911487143714061314126111601096886846
Percentage of PropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.21.31.21.31.21.11.41.51.41.41.31.2

Furniture And Fixtures Gross

us-gaap:FurnitureAndFixturesGross us-gaap:PropertyPlantAndEquipmentByType

us-gaap:FurnitureAndFixturesGross

mtb:OwnedAssets


Furniture
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value807739669676636614586547465436366
Percentage of FurnitureAndFixturesGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.60.60.60.60.50.50.60.60.60.60.5
Percentage of Assets mtb:OwnedAssets0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AssetsHeldUnderCapitalLeases


Furniture
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value8.6314181814121817179.4071.387
Percentage of FurnitureAndFixturesGross1.11.92.82.72.32.03.23.23.92.20.4
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AssetsHeldUnderCapitalLeases0.00.00.00.00.00.00.00.00.00.00.0

Leasehold Improvements Gross

us-gaap:LeaseholdImprovementsGross

us-gaap:LeaseholdImprovementsGross


Leasehold
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value302262240239232229219208198198172165
Percentage of LeaseholdImprovementsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.20.20.20.20.20.20.20.20.30.30.2

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment


Accumulated
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value977890844840761739701628566514-450.562-410.959
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.70.70.70.70.60.60.70.70.70.7-0.7-0.6

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment us-gaap:PropertyPlantAndEquipmentByType

mtb:OwnedAssets


Accumulated
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value971882835830756732686617559512-449.571-410.218
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment99.499.198.998.899.399.097.998.298.999.599.899.8
Percentage of Assets0.70.70.70.70.60.60.70.70.70.7-0.7-0.6
Percentage of Assets mtb:OwnedAssets0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AssetsHeldUnderCapitalLeases


Accumulated
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value5.9338.4259.033105.6097.58215116.1292.493-0.991-0.741
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment0.60.91.11.20.71.02.11.81.10.50.20.2
Percentage of Assets0.00.00.00.00.00.00.00.00.00.0-0.0-0.0
Percentage of Assets us-gaap:AssetsHeldUnderCapitalLeases0.00.00.00.00.00.00.00.00.00.00.00.0

Amortization Of Intangible Assets

us-gaap:AmortizationOfIntangibleAssets

us-gaap:AmortizationOfIntangibleAssets


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2.7372.7383.1293.9143.9133.9134.3055.0885.0775.025.3596.1436.3886.6327.0257.8088.1138.429.0899.78711129.5764.095.9656.7937.177.3589.2341010101213131415161717141213131416
Percentage of AmortizationOfIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1116114811611146115511541140107410661044647634637628646656673672675660658662666581590602612612625627633614595589594589592580581569567431435435
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.70.80.80.80.80.91.00.90.90.90.50.50.50.50.50.50.60.50.50.50.50.50.50.60.60.60.60.60.70.70.70.70.70.70.70.70.70.70.70.70.70.60.60.6

Goodwill

us-gaap:Goodwill

us-gaap:Goodwill


Goodwill
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-05-312011-03-312010-12-312009-12-31
Value459345934593459345934593459345934593459345934593459345934593459345934593459345934593459345933513351335243524352435243524352435243524352435243524352435243524352435240.0352435243524
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0
Percentage of Assets3.03.13.23.33.33.73.83.73.83.83.83.93.93.93.93.83.83.73.73.63.73.73.73.63.63.63.63.63.94.04.14.24.24.34.24.34.44.54.54.54.50.05.25.25.1

us-gaap:Goodwill us-gaap:StatementBusinessSegments

mtb:BusinessBanking


Goodwillus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value864864864864864864748748748748
Percentage of Goodwill18.818.818.818.818.818.821.221.221.221.2
Percentage of Assets0.60.70.70.70.70.70.80.90.91.0
Percentage of Assets mtb:BusinessBanking0.00.00.00.00.00.00.00.00.00.0

mtb:CommercialBanking


Goodwillus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value140114011401140114011401907907907907
Percentage of Goodwill30.530.530.530.530.530.525.725.725.725.7
Percentage of Assets1.01.21.21.21.11.10.91.11.11.2
Percentage of Assets mtb:CommercialBanking0.00.00.00.00.00.00.00.00.00.0

mtb:CommercialRealEstateSegment


Goodwillus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value654654654654654654349349349349
Percentage of Goodwill14.214.214.214.214.214.29.99.99.99.9
Percentage of Assets0.50.50.50.60.50.50.40.40.40.4
Percentage of Assets mtb:CommercialRealEstateSegment0.00.00.00.00.00.00.00.00.00.0

mtb:RetailBanking


Goodwillus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value1309130913091309130913091144114411441144
Percentage of Goodwill28.528.528.528.528.528.532.532.532.532.5
Percentage of Assets0.91.11.11.11.11.11.21.31.41.5
Percentage of Assets mtb:RetailBanking0.00.00.00.00.00.00.00.00.00.0

Finite Lived Intangible Assets Net

us-gaap:FiniteLivedIntangibleAssetsNet

us-gaap:FiniteLivedIntangibleAssetsNet


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value8.691114172125293338434752586471788694971061161271401822283568115176125182
Percentage of FiniteLivedIntangibleAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.10.10.10.10.10.10.10.10.10.10.00.00.00.00.10.10.20.20.3

us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:CoreDeposits


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value1225436797136255084129124176
Percentage of FiniteLivedIntangibleAssetsNet88.589.193.294.199.897.673.173.073.373.398.596.8
Percentage of Assets0.00.00.00.10.10.10.00.10.10.20.20.3
Percentage of Assets us-gaap:CoreDeposits0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OtherIntangibleAssets


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value1.6263.1723.184.240.1843.4339.4211830471.903
Percentage of FiniteLivedIntangibleAssetsNet11.510.96.85.90.22.426.927.026.726.71.5
Percentage of Assets0.00.00.00.00.00.00.00.00.00.10.0
Percentage of Assets us-gaap:OtherIntangibleAssets0.00.00.00.00.00.00.00.00.00.00.0

Deferred Tax Assets Liabilities Net

us-gaap:DeferredTaxAssetsLiabilitiesNet

us-gaap:DeferredTaxAssetsLiabilitiesNet


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value112771731715657075675838371045523661652
Percentage of DeferredTaxAssetsLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.10.50.60.60.71.01.30.81.00.0

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


Operating
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value412436392395392
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0
Percentage of Assets0.30.40.30.30.3

Equity Securities Fv Ni

us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:EquitySecuritiesFvNi

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value716463726711510010410943717273
Percentage of EquitySecuritiesFvNi100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.10.00.10.10.10.10.00.10.10.1
Percentage of Assets us-gaap:FairValueInputsLevel1 us-gaap:FairValueMeasurementsRecurring0.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value6.754172928251839454233211727
Percentage of EquitySecuritiesFvNi9.427.547.338.937.916.539.244.138.876.930.524.137.9
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:FairValueInputsLevel2 us-gaap:FairValueMeasurementsRecurring0.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value78819210193134140150151769390100
Percentage of EquitySecuritiesFvNi109.4127.5147.3138.9137.9116.5139.2144.1138.8176.9130.5124.1137.9
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of Assets us-gaap:FairValueMeasurementsRecurring0.00.00.00.00.00.00.00.00.00.00.00.00.0

Other Assets

us-gaap:OtherAssets us-gaap:ConsolidatedEntities

us-gaap:OtherAssets

srt:ParentCompany


Other
Period End2020-12-312019-12-312018-12-312017-12-31
Value92676466
Percentage of OtherAssets100.0100.0100.0100.0
Percentage of Assets0.10.10.10.1
Percentage of Assets srt:ParentCompany0.50.40.40.4

Long Term Debt

us-gaap:LongTermDebt

us-gaap:LongTermDebt


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value3499349843825458632163216986700276558476844491408382859181418577764980879493102111032810341106531017410175105099006906173916251510851215122539446074969568764766686674871287305784010240
Percentage of LongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.32.33.13.94.55.15.85.66.37.17.07.87.17.26.97.16.36.67.78.18.38.38.710.410.510.79.39.38.17.16.06.16.26.55.66.17.08.28.68.79.210.811.514.9

us-gaap:LongTermDebt us-gaap:ConsolidatedEntities

srt:ParentCompany


Long
Period End2020-12-312019-12-312018-12-312017-12-31
Value131112951277519
Percentage of LongTermDebt29.918.515.16.4
Percentage of Assets0.91.11.10.4
Percentage of Assets srt:ParentCompany7.57.67.63.1

us-gaap:LongTermDebt us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel2


Long
Period End2021-06-302021-03-312020-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value3609360944901027710382103381063910219102191064191399214754963885244525752605571476850905784
Percentage of LongTermDebt103.1103.2102.5100.6100.5100.099.9100.4100.4101.3101.5101.7102.1102.2102.7102.7102.7103.3103.5102.4101.7
Percentage of Assets2.42.43.18.18.48.38.710.410.510.89.59.58.37.26.26.26.36.75.76.37.2
Percentage of Assets us-gaap:FairValueInputsLevel20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:LongTermDebt us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure


Long
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value4490554063666233706370567703851183859160839285988193863076768104947310639
Percentage of LongTermDebt102.5101.5100.798.6101.1100.8100.6100.499.3100.2100.1100.1100.6100.6100.4100.299.899.9
Percentage of Assets3.14.04.65.05.95.66.37.17.07.87.17.26.97.26.36.67.78.7
Percentage of Assets us-gaap:FairValueInputsLevel2 us-gaap:EstimateOfFairValueFairValueDisclosure0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:LongTermDebt us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value3499349843825458632163216986700276558476844491408382859181418577764980879493102111032810341106531017410175105099006906173916251510851214607
Percentage of LongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.32.33.13.94.55.15.85.66.37.17.07.87.17.26.97.16.36.67.78.18.38.38.710.410.510.79.39.38.17.16.06.15.6
Percentage of Assets us-gaap:CarryingReportedAmountFairValueDisclosure0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:EstimateOfFairValueFairValueDisclosure


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value3609360944905540636662337063705677038511838591608392859881938630767681049473102771038210338106391021910219106419139921475496388524452574768
Percentage of LongTermDebt103.1103.2102.5101.5100.798.6101.1100.8100.6100.499.3100.2100.1100.1100.6100.6100.4100.299.8100.6100.5100.099.9100.4100.4101.3101.5101.7102.1102.2102.7102.7103.5
Percentage of Assets2.42.43.14.04.65.05.95.66.37.17.07.87.17.26.97.26.36.67.78.18.48.38.710.410.510.89.59.58.37.26.26.25.7
Percentage of Assets us-gaap:EstimateOfFairValueFairValueDisclosure0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:LongTermDebt us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

mtb:BayviewFinancial, mtb:SyndicatedLoanFacility


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value13001100120010001.0690702714826738900750750
Percentage of LongTermDebt37.131.427.418.30.010.910.010.210.88.710.78.28.9
Percentage of Assets0.90.70.80.70.00.60.60.60.70.60.70.60.6
Percentage of Assets mtb:BayviewFinancial mtb:SyndicatedLoanFacility0.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:LongTermDebt us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:StatementEquityComponents

mtb:BayviewFinancial, mtb:SyndicatedLoanFacility, us-gaap:Parent


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value185139210164168858890112941279090
Percentage of LongTermDebt5.34.04.83.02.71.31.31.31.51.11.51.01.1
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of Assets mtb:BayviewFinancial mtb:SyndicatedLoanFacility us-gaap:Parent0.00.00.00.00.00.00.00.00.00.00.00.00.0

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value467488424422419
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0
Percentage of Assets0.30.40.30.30.3

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2020-12-31
Value512
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0
Percentage of Assets0.4

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2020-12-31
Value45
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0
Percentage of Assets0.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1672016446161871610115945158151571615779156911558715460154361557715709162501631816283162131648616340164711635516173129211266712528123351233312168118861130511016107161042210202994596299428927193759244850783577752
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets11.110.911.411.611.412.713.112.612.913.012.913.213.213.213.713.613.513.213.412.913.313.113.213.213.012.712.812.713.413.413.313.012.912.612.312.311.911.911.912.011.912.512.311.3

us-gaap:StockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Stockholders
Period End2020-12-312019-12-312018-12-312017-12-31
Value16187157161546016250
Percentage of StockholdersEquity100.0100.0100.0100.0
Percentage of Assets11.413.112.913.7
Percentage of Assets srt:ParentCompany92.092.092.096.6

us-gaap:StockholdersEquity us-gaap:InvestmentType

us-gaap:SecuritiesInvestment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-31
Value11412214415116913437296.918-62.935-147.526-228.801-198.42-161.687-44.15-16.31948
Percentage of StockholdersEquity0.70.70.90.91.10.90.20.20.0-0.4-1.0-1.5-1.3-1.0-0.3-0.10.3
Percentage of Assets0.10.10.10.10.10.10.00.00.0-0.1-0.1-0.2-0.2-0.1-0.0-0.00.0
Percentage of Assets us-gaap:SecuritiesInvestment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

mtb:AccumulatedOtherAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312014-12-312013-12-31
Value1592072739814213533-11.252-30.499-29.273-24.27-15.118-5.052-4.795-4.99-5.443-4.652-2.735-2.6060.097
Percentage of StockholdersEquity1.01.31.70.60.90.90.2-0.1-0.2-0.2-0.2-0.1-0.0-0.0-0.0-0.0-0.0-0.0-0.00.0
Percentage of Assets0.10.10.20.10.10.10.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.00.0
Percentage of Assets mtb:AccumulatedOtherAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

mtb:CommonStockIssuable


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-312010-12-31
Value1.1791.1651.3441.3271.3081.2921.5661.5471.5261.5141.7261.7161.6911.6751.8471.8271.941.9212.1452.2242.2012.182.3642.3412.3322.312.6082.592.62.6162.9152.8892.862.8293.4734.0724.189
Percentage of StockholdersEquity0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.1
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets mtb:CommonStockIssuable0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312014-12-312013-12-31
Value-451.068-467.875-481.064-314.988-324.275-333.131-342.419-252.141-255.195-259.018-261.303-283.099-290.248-297.286-304.546-260.378-264.543-268.902-272.874-285.325-296.979-305.589-98.182
Percentage of StockholdersEquity-2.7-2.8-3.0-2.0-2.0-2.1-2.2-1.6-1.6-1.7-1.7-1.8-1.9-1.9-1.9-1.6-1.6-1.7-1.7-1.7-1.8-2.5-0.9
Percentage of Assets-0.3-0.3-0.3-0.2-0.2-0.3-0.3-0.2-0.2-0.2-0.2-0.2-0.2-0.3-0.3-0.2-0.2-0.2-0.2-0.2-0.2-0.3-0.1
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Stockholders
Period End2020-09-302020-06-302019-12-31
Value33839998
Percentage of StockholdersEquity2.12.50.6
Percentage of Assets0.20.30.1
Percentage of Assets us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-312010-12-31
Value-176.974-138.478-63.032175244209-206.68-80.308-112.958-288.009-420.081-542.399-517.941-483.243-363.814-247.915-270.081-291.567-294.636-114.559-101.021-150.189-251.627-163.473-217.502-152.491-180.9941240-25.261-64.159-198.062-227.771-225.953-240.264-356.441-205.22
Percentage of StockholdersEquity-1.1-0.8-0.41.11.51.3-1.3-0.5-0.7-1.8-2.7-3.5-3.3-3.1-2.2-1.5-1.7-1.8-1.8-0.7-0.6-0.9-1.6-1.3-1.7-1.2-1.50.10.3-0.2-0.6-1.8-2.1-2.2-2.4-3.8-2.5
Percentage of Assets-0.1-0.1-0.00.10.20.2-0.2-0.1-0.1-0.2-0.3-0.5-0.4-0.4-0.3-0.2-0.2-0.2-0.2-0.1-0.1-0.1-0.2-0.2-0.2-0.2-0.20.00.0-0.0-0.1-0.2-0.3-0.3-0.3-0.5-0.3
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-312010-12-31
Value6620661166176609659965886593658465776568657965856579657265906598660466036676668966906683668035113477344534093377334733023232319231123061302528282398
Percentage of StockholdersEquity39.640.240.941.141.441.742.041.741.942.142.642.742.241.840.640.440.640.740.540.940.640.941.327.227.527.527.627.427.527.828.629.029.029.429.730.528.7
Percentage of Assets4.44.44.64.84.75.35.55.25.45.55.55.65.65.55.65.55.55.45.45.35.45.45.43.63.63.53.53.53.73.73.83.83.73.73.63.63.5
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-312010-12-31
Value79797979797979797979797979797979797979797979796666666666656565656464646260
Percentage of StockholdersEquity0.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.60.60.60.60.60.60.70.7
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:PreferredStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-312010-12-31
Value125012501250125012501250125012501231123112311231123112311231123112311231123112311231123112311231123112311231123112311231881879876874872864740
Percentage of StockholdersEquity7.57.67.77.87.87.98.07.97.87.98.08.07.97.87.67.57.67.67.57.57.57.57.69.59.79.810.010.010.110.47.88.08.28.48.69.38.9
Percentage of Assets0.80.80.90.90.91.01.01.01.01.01.01.11.01.01.01.01.01.01.01.01.01.01.01.31.31.31.31.31.41.41.01.01.11.11.11.11.1
Percentage of Assets us-gaap:PreferredStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-312010-12-31
Value1403013731134441313212919128371282012490121621184211516111281076310404101649909968594379222902188018596843082738107793478077642748173097188707468876645647758675426
Percentage of StockholdersEquity83.983.583.181.681.081.281.679.277.576.074.572.169.166.262.560.759.558.255.955.253.452.652.164.064.063.363.362.061.561.563.664.264.363.863.563.364.9
Percentage of Assets9.39.19.49.59.310.310.710.010.09.99.69.59.18.88.68.28.07.77.57.17.16.96.98.58.48.18.17.98.28.38.48.48.38.07.87.58.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312010-12-31
Value-5084.515-5089.093-5142.732-5147.635-5149.118-5150.999-4822.563-4546.237-4247.993-3848.198-3528.851-3048.405-2560.282-2096.861-1454.282-1254.733-1050.141-849.468-431.796-569.941-233.121-88.671-67.445
Percentage of StockholdersEquity-30.4-30.9-31.8-32.0-32.3-32.6-30.7-28.8-27.1-24.7-22.8-19.7-16.4-13.3-8.9-7.7-6.4-5.2-2.6-3.5-1.4-0.5-0.8
Percentage of Assets-3.4-3.4-3.6-3.7-3.7-4.1-4.0-3.6-3.5-3.2-2.9-2.6-2.2-1.8-1.2-1.0-0.9-0.7-0.3-0.4-0.2-0.1-0.1
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value7979797979797979797979797979797979797979797979666666666665656565646464636363626262606060
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.1

Additional Paid In Capital

us-gaap:AdditionalPaidInCapital

us-gaap:AdditionalPaidInCapital


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value66206611661766096599658865936584657765686579658565796572659065986604660366766689669066836680351134773445340933773347330232323192311230613025295128742857282828142800236723982442
Percentage of AdditionalPaidInCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.44.44.64.84.75.35.55.25.45.55.55.65.65.55.65.55.55.45.45.35.45.45.43.63.63.53.53.53.73.73.83.83.73.73.63.63.63.63.63.63.63.53.53.5

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value14030137311344413132129191283712820124901216211842115161112810763104041016499099685943792229021880185968430827381077934780776427481730971887074688766456477628660985969586758235745553454265076
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets9.39.19.49.59.310.310.710.010.09.99.69.59.18.88.68.28.07.77.57.17.16.96.98.58.48.18.17.98.28.38.48.48.38.07.87.87.57.57.57.57.48.28.07.4

us-gaap:RetainedEarningsAccumulatedDeficit us-gaap:Restatement, us-gaap:AdjustmentsForNewAccountingPronouncements

srt:RevisionOfPriorPeriodAccountingStandardsUpdateAdjustment, us-gaap:NewAccountingPronouncement


Retained
Period End2020-12-31
Value17
Percentage of RetainedEarningsAccumulatedDeficit0.1
Percentage of Assets0.0
Percentage of Assets srt:RevisionOfPriorPeriodAccountingStandardsUpdateAdjustment us-gaap:NewAccountingPronouncement0.0

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value-176.974-138.478-63.032175244209-206.68-80.308-112.958-288.009-420.081-542.399-517.941-483.243-363.814-247.915-270.081-291.567-294.636-114.559-101.021-150.189-251.627-163.473-217.502-152.491-180.9941240-25.261-64.159-198.062-227.771-225.953-240.264-230.075-277.849-331.258-356.441-192.533-228.769-197.521-205.22-192.554-197.197-255.181-335.997-736.881-114.822
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-0.1-0.1-0.00.10.20.2-0.2-0.1-0.1-0.2-0.3-0.5-0.4-0.4-0.3-0.2-0.2-0.2-0.2-0.1-0.1-0.1-0.2-0.2-0.2-0.2-0.20.00.0-0.0-0.1-0.2-0.3-0.3-0.3-0.3-0.3-0.4-0.5-0.2-0.3-0.3-0.30.00.00.0-0.50.00.0

Treasury Stock Value

us-gaap:TreasuryStockValue

us-gaap:TreasuryStockValue


Treasury
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value508450895142514751495150482245464247384835283048256020961454125410508494310.00.00.04.89867225
Percentage of TreasuryStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0100.0100.0100.0
Percentage of Assets3.43.43.63.73.74.14.03.63.53.22.92.62.21.81.21.00.90.70.30.00.00.00.00.10.3

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value536994664-6.012525-394.442113074666413550101837484716442561428-112.819-81.90269826-170.85210553948642292770426220375653
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating55.397.863.9-0.650.9-35.295.360.75.433.745.187.23.344.766.741.977.658.4-15.2-10.995.73.5-22.914.375.568.058.613.4115.562.432.254.896.6

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-50.625-8931.747-4043.489967-15091.885-3852.3634726-3418.808-852.12271-2946.781873911-248.531215514-3441.038-1641.444229-419.729-371.773-1334.436329-1372.249-1683.854-245.755-225.6261252-412.5792219.694291-47.655
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating-5.2-878.3-389.296.6-1462.0-343.8398.6-278.1-68.822.1-241.574.880.7-23.0113.248.7-476.0-223.530.9-55.9-50.9-179.044.3-186.1-235.8-34.3-31.3182.0-61.832.51.442.6-7.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-335.8776443442-826.827146224108-6240.1373219789-1022.7462690-1949.6-872.151-363.873-1879.021-934.3442970825468150-487.17316714113451036-142.654-175.551-994.807-309.524-803.517-196.888-654.622-808.617
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating-34.6751.7331.4-82.61416.6366.7-526.2261.963.8-83.4220.5-167.0-77.3-33.6-174.9-88.4410.8112.563.120.0-66.7224.35.5182.5145.2-19.9-24.4-144.5-46.4-117.7-28.7-95.6-119.5

Deferred Income Tax Expense Benefit

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:DeferredIncomeTaxExpenseBenefit


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value153988-29.82-53.85-36.243400.8662.3761389500.792-124.772390-7.21-19.5953664144450376-9.743-7.1683759-7.187-1.29242466211192396-3.161151932-29.639111.95772-12.76-10.163
Percentage of DeferredIncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Other Operating Capital Net

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value222774350-79.76673-151.494-69.15-26.59171112129-90.01-165.114312-59.478-50.8690.20953-145.989102-70.766300-50.703-40.58180-20.7036.608140-57.88443-95.06460-80.645-4.17216967-32.134-168.89245-21.703-2.063-24.97735-74.866-80.537
Percentage of IncreaseDecreaseInOtherOperatingCapitalNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value536994664-6.012525-394.442113074666413550101837484716442561428-112.819-81.90269826-170.85210553948642292770426220375653
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating55.397.863.9-0.650.9-35.295.360.75.433.745.187.23.344.766.741.977.658.4-15.2-10.995.73.5-22.914.375.568.058.613.4115.562.432.254.896.6

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value458447471372241268493480473482546526493352322355381348330349336298270280286241277275284229221294348274296293233206147183322206204192188150
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating47.244.045.437.223.424.041.639.038.239.444.845.143.732.630.033.737.034.733.636.134.630.730.036.437.732.736.737.138.731.730.139.746.437.639.739.431.628.920.625.446.830.929.928.027.622.3

us-gaap:NetIncomeLoss us-gaap:StatementBusinessSegments

mtb:BusinessBanking


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value4146353732464243434337312822342122253523252412302728212630323638
Percentage of NetIncomeLoss9.110.39.615.612.29.68.99.08.38.710.78.87.56.410.36.16.88.513.18.68.810.34.311.29.812.59.69.08.811.912.213.1
Percentage of InterestAndDividendIncomeOperating4.34.53.63.62.93.83.43.53.73.83.53.02.82.23.52.22.32.63.93.13.33.41.64.23.84.02.93.64.14.54.95.2
Percentage of InterestAndDividendIncomeOperating mtb:BusinessBanking0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

mtb:CommercialBanking


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value111122131111143132123132147126125109105112101102105101117108108969610110599999787107116112
Percentage of NetIncomeLoss24.227.435.346.153.527.626.127.428.125.635.630.827.732.330.829.431.433.943.538.737.739.934.637.037.143.644.933.025.039.239.238.4
Percentage of InterestAndDividendIncomeOperating11.412.113.110.812.810.810.010.812.711.211.610.410.311.210.410.610.910.413.114.114.213.112.713.714.313.813.513.111.614.715.615.1
Percentage of InterestAndDividendIncomeOperating mtb:CommercialBanking0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

mtb:CommercialRealEstateSegment


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-03-312012-12-312012-09-30
Value8671871071171311211171161121089787849590848090857980857875747579768475
Percentage of NetIncomeLoss18.915.923.444.443.727.325.724.322.122.930.727.322.924.228.925.725.027.033.330.427.833.130.928.626.632.634.327.027.928.425.9
Percentage of InterestAndDividendIncomeOperating8.97.08.710.410.510.79.89.610.010.010.09.28.58.49.79.38.78.310.011.110.510.911.310.610.310.310.310.710.511.310.2
Percentage of InterestAndDividendIncomeOperating mtb:CommercialRealEstateSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

mtb:DiscretionaryPortfolio


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value789097952529383939291931293312504639375.113105.954138.27914111025-8.0361.846-5.078-5.039
Percentage of NetIncomeLoss17.120.226.239.79.56.28.08.17.65.95.68.97.89.73.614.513.813.413.81.83.82.55.03.05.34.95.08.6-2.30.7-1.7-1.7
Percentage of InterestAndDividendIncomeOperating8.18.99.79.32.32.43.13.23.42.61.83.02.93.41.25.24.84.14.20.71.40.81.81.12.01.61.53.4-1.10.3-0.7-0.7
Percentage of InterestAndDividendIncomeOperating mtb:DiscretionaryPortfolio0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

mtb:ResidentialMortgageBanking


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value3049453724157.64212131514131314-4.528221917-1.121273112252719181234344044
Percentage of NetIncomeLoss6.611.112.215.59.23.31.62.72.53.14.23.83.64.3-1.46.65.95.7-0.47.59.713.24.59.19.78.58.24.39.812.513.715.2
Percentage of InterestAndDividendIncomeOperating3.14.94.53.62.21.30.61.11.11.41.41.31.31.5-0.52.42.11.8-0.12.73.64.31.63.43.82.72.51.74.64.75.56.0
Percentage of InterestAndDividendIncomeOperating mtb:ResidentialMortgageBanking0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

mtb:RetailBanking


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value8985858611013114014514114312396100819069716385646868178323229245351525558
Percentage of NetIncomeLoss19.519.122.935.941.027.429.730.126.929.035.027.126.323.527.319.921.321.231.623.124.028.564.411.911.313.011.118.314.819.118.819.9
Percentage of InterestAndDividendIncomeOperating9.28.48.58.49.810.711.311.812.112.711.49.19.78.19.27.27.46.59.58.49.09.323.64.44.44.13.37.36.97.27.57.8
Percentage of InterestAndDividendIncomeOperating mtb:RetailBanking0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AllOtherSegments


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
Value20-18.447-109.933-234.211-185.774-6.983-0.302-7.4242323-76.941-23.96715-1.4391.32-7.502-13.898-29.129-94.75-28.312-33.759-66.514-120.73-2.083-1.034-66.323-176.46-0.62263
Percentage of NetIncomeLoss4.6-4.1-29.5-97.2-69.1-1.5-0.1-1.54.54.8-21.8-6.74.2-0.40.4-2.1-4.1-9.8-35.0-10.1-11.8-27.5-43.5-0.8-0.4-29.0-79.7-0.218.1
Percentage of InterestAndDividendIncomeOperating2.2-1.8-11.0-22.7-16.6-0.6-0.0-0.62.02.1-7.1-2.31.5-0.10.1-0.8-1.4-3.0-10.5-3.7-4.4-9.0-16.0-0.3-0.1-9.2-24.0-0.18.4
Percentage of InterestAndDividendIncomeOperating us-gaap:AllOtherSegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-50.625-8931.747-4043.489967-15091.885-3852.3634726-3418.808-852.12271-2946.781873911-248.531215514-3441.038-1641.444229-419.729-371.773-1334.436329-1372.249-1683.854-245.755-225.6261252-412.5792219.694291-47.655
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating-5.2-878.3-389.296.6-1462.0-343.8398.6-278.1-68.822.1-241.574.880.7-23.0113.248.7-476.0-223.530.9-55.9-50.9-179.044.3-186.1-235.8-34.3-31.3182.0-61.832.51.442.6-7.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-335.8776443442-826.827146224108-6240.1373219789-1022.7462690-1949.6-872.151-363.873-1879.021-934.3442970825468150-487.17316714113451036-142.654-175.551-994.807-309.524-803.517-196.888-654.622-808.617
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating-34.6751.7331.4-82.61416.6366.7-526.2261.963.8-83.4220.5-167.0-77.3-33.6-174.9-88.4410.8112.563.120.0-66.7224.35.5182.5145.2-19.9-24.4-144.5-46.4-117.7-28.7-95.6-119.5

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt

us-gaap:RepaymentsOfLongTermDebt


Repayments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.04785210598501.3027530.966758751.1397511.224202504404301132614016921045.40431785881.2833211.79752138.13522.2751.7592533.46352720804202594188025281116292853252
Percentage of RepaymentsOfLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments Of Dividends Common Stock

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:PaymentsOfDividendsCommonStock


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value141142141141141143145132134139139143115112112114114116108109111112939393939392929291919190908890898888888484848383
Percentage of PaymentsOfDividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock


Payments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value0.00.00.037328229940136549949847572022422422453237350154100
Percentage of PaymentsForRepurchaseOfCommonStock0.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value174.11170.15157.98152.23139.6126.65105.31105.48103.398.3797.3594.45
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits us-gaap:IncomeTaxAuthority

us-gaap:UnrecognizedTaxBenefits

mtb:AccruedInterest


Unrecognized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value7.6157.1996.6295.6517.9157.9693.86914129.277201917
Percentage of UnrecognizedTaxBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mtb:FederalStateAndLocalTax


Unrecognized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value48585645352410141618242838
Percentage of UnrecognizedTaxBenefits641.7819.1848.9804.0453.4307.9276.999.4133.7197.6120.1145.1218.1

mtb:UnrecognizedIncomeTaxBenefits


Unrecognized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value56666251433214292827454755
Percentage of UnrecognizedTaxBenefits741.7919.1948.9904.0553.4407.9376.9199.4233.7297.6220.1245.1318.1

mtb:AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesOptionAdjustedBasisSpreadOnVariableRate us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument

mtb:AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesOptionAdjustedBasisSpreadOnVariableRate

us-gaap:FairValueInputsLevel3, us-gaap:ResidentialMortgage


Assumption
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value0900.00891.009.0
Percentage of AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesOptionAdjustedBasisSpreadOnVariableRate0.0100.00.0100.00.0100.0

mtb:CommonSharesOutstandingIncludingCommonStockIssuableAndUnvestedStockBasedCompensationAwards

mtb:CommonSharesOutstandingIncludingCommonStockIssuableAndUnvestedStockBasedCompensationAwards


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value129129-0.114129129130-0.987133136138-1.437143145149-0.722152153155-0.5891561591604.481341331330.161321321310.2661301291290.3441271271270.6691261241200.147120119119
Percentage of CommonSharesOutstandingIncludingCommonStockIssuableAndUnvestedStockBasedCompensationAwards100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mtb:DepreciationAndAmortization1

mtb:DepreciationAndAmortization1


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value5657565553545453515024
Percentage of DepreciationAndAmortization1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mtb:GainLossOnHedgedItemInFairValueHedge us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation, us-gaap:TradingActivityByType

mtb:GainLossOnHedgedItemInFairValueHedge

us-gaap:InterestRateSwap, us-gaap:FairValueHedging, us-gaap:DesignatedAsHedgingInstrument, mtb:FixedRateLongTermBorrowings


Gain
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-0.078311712-0.605-87.82418-22.412-56.458-34.014-57.89212134228145.0114.0129.303127.146
Percentage of GainLossOnHedgedItemInFairValueHedge100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mtb:ImpairedFinancingReceivableNonaccrualInterestIncome

mtb:ImpairedFinancingReceivableNonaccrualInterestIncome


Impaired
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1110111218125.6569.1011110
Percentage of ImpairedFinancingReceivableNonaccrualInterestIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mtb:ImpairedFinancingReceivableNonaccrualInterestIncome us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

mtb:CommercialFinancialLeasing


Impaired
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2.933.0852.2345.9991.2981.7381.4080.8363.6353.081
Percentage of ImpairedFinancingReceivableNonaccrualInterestIncome25.228.819.849.07.213.824.99.231.429.4

mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstruction


Impaired
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.6041.6581.0390.9934.6971.0920.6381.8022.3141.096
Percentage of ImpairedFinancingReceivableNonaccrualInterestIncome5.215.59.28.125.98.711.319.820.010.5

mtb:HomeEquityLinesAndLoans


Impaired
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.9930.9520.8561.0170.761.4591.371.8461.4611.31
Percentage of ImpairedFinancingReceivableNonaccrualInterestIncome8.68.97.68.34.211.624.220.312.612.5

mtb:OtherCommercialConstruction


Impaired
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.2740.0411.6480.2325.7160.861-1.0350.4880.5440.637
Percentage of ImpairedFinancingReceivableNonaccrualInterestIncome2.40.414.61.931.56.8-18.35.44.76.1

mtb:OtherLoans


Impaired
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.1430.180.880.1740.1610.1540.1160.1450.1250.122
Percentage of ImpairedFinancingReceivableNonaccrualInterestIncome1.21.77.81.40.91.22.11.61.11.2

mtb:RecreationalFinance


Impaired
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.1590.1550.1650.1550.1540.1520.1440.1470.1420.142
Percentage of ImpairedFinancingReceivableNonaccrualInterestIncome1.41.41.51.30.81.22.51.61.21.4

mtb:ResidentialBuilderAndDeveloper


Impaired
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.00.0331.5210.1140.0110.0480.0490.0890.0350.184
Percentage of ImpairedFinancingReceivableNonaccrualInterestIncome0.00.313.50.90.10.40.91.00.31.8

mtb:ResidentialLimitedDocumentation


Impaired
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.1570.0790.0630.1140.2560.2010.2970.2690.2740.252
Percentage of ImpairedFinancingReceivableNonaccrualInterestIncome1.40.70.60.91.41.65.33.02.42.4

mtb:ResidentialRealEstateExcludingAltA


Impaired
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value6.2964.4982.8113.415.0296.8192.6163.4252.993.599
Percentage of ImpairedFinancingReceivableNonaccrualInterestIncome54.341.925.027.827.754.246.337.625.834.4

us-gaap:AutomobileLoan


Impaired
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.0480.0490.0470.0470.0450.0470.0530.0540.0530.054
Percentage of ImpairedFinancingReceivableNonaccrualInterestIncome0.40.50.40.40.20.40.90.60.50.5

mtb:IncomeAttributableToUnvestedStockBasedCompensationAwardsBasic

mtb:IncomeAttributableToUnvestedStockBasedCompensationAwardsBasic


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2.2632.1082.2271.6870.9061.0432.6082.5682.4982.5262.7572.5982.4321.7321.7811.9922.1582.1282.4652.6742.7462.4662.5862.7462.92.4653.0072.9963.2132.6232.5383.5454.3733.5244.1574.1813.3452.941.9742.5134.4792.9092.6682.5262.51.913
Percentage of IncomeAttributableToUnvestedStockBasedCompensationAwardsBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mtb:IncomeAttributableToUnvestedStockBasedCompensationAwardsDiluted

mtb:IncomeAttributableToUnvestedStockBasedCompensationAwardsDiluted


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value2.262.1062.2261.6860.9051.0432.6072.5682.4972.5262.7562.5962.431.7311.7791.9892.1542.1232.4592.6682.742.4622.582.7372.892.4582.9942.9843.1982.6122.5273.5254.3543.5074.1394.173.3382.9351.9772.514.4642.9012.6612.517
Percentage of IncomeAttributableToUnvestedStockBasedCompensationAwardsDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mtb:IncreaseDecreaseInEstimatedFairValueOfInterestRateContractsInAssetPosition

mtb:IncreaseDecreaseInEstimatedFairValueOfInterestRateContractsInAssetPosition


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value22-54.6-2.70.20.2-3.3-26.11258-88.1-131.73036235
Percentage of IncreaseDecreaseInEstimatedFairValueOfInterestRateContractsInAssetPosition100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mtb:IncreaseDecreaseInEstimatedFairValueOfInterestRateContractsInLiabilityPosition

mtb:IncreaseDecreaseInEstimatedFairValueOfInterestRateContractsInLiabilityPosition


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-1.1-502.013855-54.9-945.1109-109.4-158.4-122.847-1.3-2.26.2
Percentage of IncreaseDecreaseInEstimatedFairValueOfInterestRateContractsInLiabilityPosition100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mtb:IncreaseDecreaseInFairValueOfNonrecurringFairValueMeasuredLoansForChargeOffsAndImpairmentReserves us-gaap:FairValueByFairValueHierarchyLevel

mtb:IncreaseDecreaseInFairValueOfNonrecurringFairValueMeasuredLoansForChargeOffsAndImpairmentReserves

us-gaap:FairValueInputsLevel3


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value-46000000.0-66000000.0-140000000.0-82000000.0-50000000.0-21000000.0-25000000.0-51000000.0-20000000.0-20000000.0-14000000.0-35000000.0-21000000.0-27000000.0-1000000.0-16000000.0-21000000.0-42000000.0-29000000.0-20000000.0-4000000.0-27000000.0-22000000.0-11000000.0
Percentage of IncreaseDecreaseInFairValueOfNonrecurringFairValueMeasuredLoansForChargeOffsAndImpairmentReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mtb:InterestExpensesSavingsAndInterestCheckingDeposits

mtb:InterestExpensesSavingsAndInterestCheckingDeposits


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value8.0521119222678951049176695648403937302526242016
Percentage of InterestExpensesSavingsAndInterestCheckingDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mtb:MerchantDiscountAndCreditCardFees us-gaap:AdjustmentsForNewAccountingPronouncements

mtb:MerchantDiscountAndCreditCardFees

us-gaap:AccountingStandardsUpdate201409


Merchant
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3424282521272528282527272624
Percentage of MerchantDiscountAndCreditCardFees100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mtb:MerchantDiscountAndCreditCardFees us-gaap:AdjustmentsForNewAccountingPronouncements, us-gaap:StatementBusinessSegments

us-gaap:AccountingStandardsUpdate201409, mtb:BusinessBanking


Merchant
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value139.48111108.159108.3759.6929.8958.8829.4829.2388.3347.503
Percentage of MerchantDiscountAndCreditCardFees40.238.940.041.138.838.033.534.434.535.334.733.332.030.3

us-gaap:AccountingStandardsUpdate201409, mtb:CommercialBanking


Merchant
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value141012108.891131313131213131212
Percentage of MerchantDiscountAndCreditCardFees42.342.743.842.042.249.054.147.645.848.148.548.748.151.3

us-gaap:AccountingStandardsUpdate201409, mtb:CommercialRealEstateSegment


Merchant
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.50.4450.5010.4920.3790.8490.7440.670.4960.6060.5880.6430.4280.554
Percentage of MerchantDiscountAndCreditCardFees1.51.81.81.91.83.13.02.41.72.42.22.31.62.2

us-gaap:AccountingStandardsUpdate201409, mtb:RetailBanking


Merchant
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value5.9083.9213.6014.1593.452.2710.2864.154.5663.1383.4883.9084.143.388
Percentage of MerchantDiscountAndCreditCardFees17.316.112.616.216.48.41.114.715.912.512.814.115.913.7

us-gaap:AccountingStandardsUpdate201409, us-gaap:AllOtherSegments


Merchant
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-0.4540.1090.506-0.3150.1760.42.090.2690.6020.420.5130.4620.6180.615
Percentage of MerchantDiscountAndCreditCardFees-1.30.41.8-1.20.81.58.41.02.11.71.91.72.42.5

mtb:NetChangeInAccruedInterestReceivablePayable

mtb:NetChangeInAccruedInterestReceivablePayable


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-35.84536-3.573873413-22.152-3.121-40.72135-23.01635-20.56214-5.16316-17.43223-1.55116-18.888164013-10.1122.2-5.5250.398-13.2213.1857.7041.688-1.7412.8723.186125.994-7.72521101.033-5.06814-7.0122.346-0.098
Percentage of NetChangeInAccruedInterestReceivablePayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mtb:NetIncomeLossAvailableToCommonStockholdersBasicBeforeUnvestedStockBasedCompensationAwardsAdjustment

mtb:NetIncomeLossAvailableToCommonStockholdersBasicBeforeUnvestedStockBasedCompensationAwardsAdjustment


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value441430454355224251475463455464528507475334304337362330310329315278250260266221257254263214206278332258280278218191131167301193191179176138
Percentage of NetIncomeLossAvailableToCommonStockholdersBasicBeforeUnvestedStockBasedCompensationAwardsAdjustment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mtb:NetIncomeLossAvailableToCommonStockholdersDilutedBeforeUnvestedStockBasedCompensationAwardsAdjustment

mtb:NetIncomeLossAvailableToCommonStockholdersDilutedBeforeUnvestedStockBasedCompensationAwardsAdjustment


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value441430454355224251475463455464528507475334304337362330310329315278250260266221257254263214206278332258280278218191131167301193191179176138
Percentage of NetIncomeLossAvailableToCommonStockholdersDilutedBeforeUnvestedStockBasedCompensationAwardsAdjustment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mtb:NetIncreaseDecreaseInLoanServicingAdvances

mtb:NetIncreaseDecreaseInLoanServicingAdvances


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-43.015-374.614-904.661-29.146227-48.866-136.999-356.7420.77222404.127147115-10.025-56.5034756482.0368137-13.42914424176-143.939-83.046-134.794-122.91-819.416-232.79756-9.054
Percentage of NetIncreaseDecreaseInLoanServicingAdvances100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mtb:NetIncreaseDecreaseInShortTermBorrowings

mtb:NetIncreaseDecreaseInShortTermBorrowings


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value32-0.52513-6.175-6.882-3.183-5451.533
Percentage of NetIncreaseDecreaseInShortTermBorrowings100.0100.0100.0100.0100.0100.0100.0

mtb:NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification1 us-gaap:Restatement

mtb:NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification1

us-gaap:AccountingStandardsUpdate201613


New
Period End2020-12-312020-09-302020-06-302020-03-31
Value000-91925000.0
Percentage of NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification10.00.00.0100.0

mtb:NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification1 us-gaap:Restatement, us-gaap:StatementEquityComponents

us-gaap:AccountingStandardsUpdate201613, us-gaap:RetainedEarnings


New
Period End2020-12-312020-09-302020-06-302020-03-31
Value000-91925000.0
Percentage of NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification10.00.00.0100.0

mtb:NoninterestIncomeExpenseOtherOperatingIncomeLoss us-gaap:AdjustmentsForNewAccountingPronouncements

mtb:NoninterestIncomeExpenseOtherOperatingIncomeLoss

us-gaap:AccountingStandardsUpdate201409


Noninterest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2022242115232220252322202422
Percentage of NoninterestIncomeExpenseOtherOperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mtb:NoninterestIncomeExpenseOtherOperatingIncomeLoss us-gaap:AdjustmentsForNewAccountingPronouncements, us-gaap:StatementBusinessSegments

us-gaap:AccountingStandardsUpdate201409, mtb:CommercialBanking


Noninterest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1.0530.9583.4952.940.7872.1862.1121.2393.1451.0021.9251.6623.6461.563
Percentage of NoninterestIncomeExpenseOtherOperatingIncomeLoss5.34.214.513.75.09.49.36.112.44.38.77.914.96.8

us-gaap:AccountingStandardsUpdate201409, mtb:CommercialRealEstateSegment


Noninterest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1.9261.0913.2580.9291.1880.8432.7751.3722.681.7882.3631.8222.2150.859
Percentage of NoninterestIncomeExpenseOtherOperatingIncomeLoss9.64.813.54.37.53.612.36.710.57.710.78.79.13.8

us-gaap:AccountingStandardsUpdate201409, mtb:DiscretionaryPortfolio


Noninterest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.3760.3840.4130.2050.150.8570.2310.5030.6410.4010.4870.3860.4130.452
Percentage of NoninterestIncomeExpenseOtherOperatingIncomeLoss1.91.71.71.01.03.71.02.52.51.72.21.81.72.0

us-gaap:AccountingStandardsUpdate201409, mtb:ResidentialMortgageBanking


Noninterest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1.4471.7221.6311.1271.0520.9220.5790.8161.0331.0640.9280.9160.9271.043
Percentage of NoninterestIncomeExpenseOtherOperatingIncomeLoss7.27.56.85.36.74.02.64.04.14.64.24.43.84.6

us-gaap:AccountingStandardsUpdate201409, mtb:RetailBanking


Noninterest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value6.0125.8075.6715.9943.1665.9828.9749.3479.3298.4949.6549.3979.6139.865
Percentage of NoninterestIncomeExpenseOtherOperatingIncomeLoss30.025.323.528.020.125.739.745.936.736.643.644.939.443.1

us-gaap:AccountingStandardsUpdate201409, us-gaap:AllOtherSegments


Noninterest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value9.197129.666109.421127.9297.0768.595106.8046.7237.5989.108
Percentage of NoninterestIncomeExpenseOtherOperatingIncomeLoss46.056.540.147.759.853.735.134.833.845.130.732.231.139.8

mtb:OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanActuarialLossRecognizedInNetPeriodicBenefitCostNetOfTax

mtb:OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanActuarialLossRecognizedInNetPeriodicBenefitCostNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value171372-49.2289.522103.8233.8224.5873.0597.9187.9187.8018.0344.2884.2874.4654.1094.5794.5414.1655.0349.6126.8466.8665.6182.2012.2022.3672.0356.2936.2936.2076.3795.865.7255.6795.771
Percentage of OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanActuarialLossRecognizedInNetPeriodicBenefitCostNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mtb:OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanActuarialLossRecognizedInNetPeriodicBenefitCostTaxEffect

mtb:OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanActuarialLossRecognizedInNetPeriodicBenefitCostTaxEffect


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-4.368-7.995-26.80721-5.258-3.588-1.363-1.364-1.636-1.091-2.824-14.122.7822.8662.7812.7822.8972.6662.9723.012.6383.2661.6214.3874.3995.5821.4221.4221.531.3154.0664.0664.0114.1213.7843.6993.6693.729
Percentage of OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanActuarialLossRecognizedInNetPeriodicBenefitCostTaxEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mtb:OtherComprehensiveIncomeLossNetYieldAdjustmentFromCashFlowHedgesBeforeTax

mtb:OtherComprehensiveIncomeLossNetYieldAdjustmentFromCashFlowHedgesBeforeTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-66.611-82.044-88.373-82.404-69.153-32.041-19.704-4.4834.5516.6255.6894.1812.8890.58-1.641-1.181
Percentage of OtherComprehensiveIncomeLossNetYieldAdjustmentFromCashFlowHedgesBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mtb:OtherComprehensiveIncomeLossNetYieldAdjustmentFromCashFlowHedgesBeforeTax us-gaap:StatementEquityComponents

mtb:AccumulatedOther


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-66.611-82.044-88.373-82.404-69.153-32.041-19.704-4.4834.5516.6255.6894.1812.8890.58-1.641-1.181
Percentage of OtherComprehensiveIncomeLossNetYieldAdjustmentFromCashFlowHedgesBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mtb:OtherComprehensiveIncomeLossNetYieldAdjustmentFromCashFlowHedgesNetOfTax

mtb:OtherComprehensiveIncomeLossNetYieldAdjustmentFromCashFlowHedgesNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-49861000.0-59829000.0-65640000.0-61108000.0-51366000.0-23618000.0-14523000.0-3305000.03355000.04883000.04193000.03082000.02129000.0428000.0-995000.0-716000.0
Percentage of OtherComprehensiveIncomeLossNetYieldAdjustmentFromCashFlowHedgesNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mtb:OtherComprehensiveIncomeLossNetYieldAdjustmentFromCashFlowHedgesTax

mtb:OtherComprehensiveIncomeLossNetYieldAdjustmentFromCashFlowHedgesTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value16222221178.4235.1811.178-1.196-1.742-1.496-1.099-0.76-0.1520.6460.465
Percentage of OtherComprehensiveIncomeLossNetYieldAdjustmentFromCashFlowHedgesTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mtb:OtherComprehensiveIncomeLossReclassificationAdjustmentForRealizedGainsLossesIncludedInNetIncomeBeforeTax

mtb:OtherComprehensiveIncomeLossReclassificationAdjustmentForRealizedGainsLossesIncludedInNetIncomeBeforeTax


Other
Period End2021-06-302021-03-312020-12-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312017-09-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312013-12-312013-09-302012-12-312012-09-302012-06-302012-03-31
Value-0.001-0.0030.001-0.0040.00.00.0070.00.0-21.2960.0-1.566-28.48-0.264-0.0040.0220.216-0.01-0.0980.00.00.00.372-0.4080.045
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentForRealizedGainsLossesIncludedInNetIncomeBeforeTax100.0100.0100.0100.00.00.0100.00.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0100.0100.0100.0

mtb:OtherComprehensiveIncomeLossReclassificationAdjustmentForRealizedGainsLossesIncludedInNetIncomeBeforeTax us-gaap:InvestmentType

us-gaap:SecuritiesInvestment


Other
Period End2021-06-302021-03-312020-12-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-0.001-0.0030.001-0.0040.00.00.0070.00.0
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentForRealizedGainsLossesIncludedInNetIncomeBeforeTax100.0100.0100.0100.00.00.0100.00.00.0

mtb:OtherComprehensiveIncomeLossReclassificationAdjustmentForRealizedGainsLossesIncludedInNetIncomeNetOfTax

mtb:OtherComprehensiveIncomeLossReclassificationAdjustmentForRealizedGainsLossesIncludedInNetIncomeNetOfTax


Other
Period End2021-06-302021-03-312020-12-312019-12-312019-09-302018-12-312018-09-302017-12-312017-09-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312013-12-312013-09-302012-12-312012-09-30
Value0.0010.0020.003-0.0070.00.00.0140.00.95170.1630.003-0.0130.0-0.006-0.0620.00.00.00.223
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentForRealizedGainsLossesIncludedInNetIncomeNetOfTax100.0100.0100.0100.00.00.00.0100.00.0100.0100.0100.0100.0100.00.0100.0100.00.00.00.0100.0

mtb:OtherComprehensiveIncomeLossReclassificationAdjustmentForRealizedGainsLossesIncludedInNetIncomeTax

mtb:OtherComprehensiveIncomeLossReclassificationAdjustmentForRealizedGainsLossesIncludedInNetIncomeTax


Other
Period End2021-06-302021-03-312020-12-312019-12-312019-09-302018-12-312018-09-302017-12-312017-09-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312013-12-312013-09-302012-12-312012-09-30
Value0.00.0010.00.0010.00.00.0-7.2020.0-0.616-11.207-0.101-0.0010.0090.00.0040.0360.00.00.00.149
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentForRealizedGainsLossesIncludedInNetIncomeTax0.0100.00.0100.00.00.00.0100.00.0100.0100.0100.0100.0100.00.0100.0100.00.00.00.0100.0

mtb:OtherComprehensiveIncomeReclassificationToIncomeOfUnrealizedHoldingLossesBeforeTax

mtb:OtherComprehensiveIncomeReclassificationToIncomeOfUnrealizedHoldingLossesBeforeTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value1242000.0990000.0928000.01059000.0847000.0772000.0870000.0833000.0763000.0928000.01733000.0929000.0780000.0810000.0852000.0814000.0934000.0787000.0998000.0917000.01113000.0968000.01097000.0828000.0850000.0739000.05914000.0-837000.0-878000.0-825000.0-930000.0-986000.0-1176000.0-1195000.0-116000.0-47000.0-678000.0-819000.0-332000.0-201000.0-242000.0230000.0
Percentage of OtherComprehensiveIncomeReclassificationToIncomeOfUnrealizedHoldingLossesBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mtb:OtherComprehensiveIncomeReclassificationToIncomeOfUnrealizedHoldingLossesBeforeTax us-gaap:InvestmentType

us-gaap:SecuritiesInvestment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1242000.0990000.0928000.01059000.0847000.0772000.0870000.0833000.0763000.0928000.01733000.0929000.0780000.0810000.0
Percentage of OtherComprehensiveIncomeReclassificationToIncomeOfUnrealizedHoldingLossesBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mtb:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnHeldToMaturitySecuritiesArisingDuringPeriodNetOfTax

mtb:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnHeldToMaturitySecuritiesArisingDuringPeriodNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value931000.0714000.0687000.0784000.0600000.0569000.0641000.0615000.0563000.0683000.01277000.0685000.0575000.0597000.0517000.0493000.0567000.0477000.0606000.0556000.0675000.0587000.0658000.0505000.0518000.0450000.0507000.0509000.0533000.0501000.0565000.0599000.0714000.0726000.000-610000.0-1120000.0-1104000.00-88000.0-5076000.0
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnHeldToMaturitySecuritiesArisingDuringPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.00.0100.0100.0

mtb:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnHeldToMaturitySecuritiesArisingDuringPeriodTax

mtb:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnHeldToMaturitySecuritiesArisingDuringPeriodTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value-311000.0-276000.0-241000.0-275000.0-247000.0-203000.0-229000.0-218000.0-200000.0-245000.0-456000.0-1080000.0205000.0213000.0335000.0321000.0367000.0310000.0392000.0361000.0438000.0381000.0439000.0323000.0332000.0289000.02321000.0-328000.0-345000.0-324000.0-365000.0-387000.0-462000.0-469000.000395000.0723000.0713000.0057000.03279000.0
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnHeldToMaturitySecuritiesArisingDuringPeriodTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.00.0100.0100.0

mtb:PaymentsToAcquireEquityAndOtherSecuritiesInvestments

mtb:PaymentsToAcquireEquityAndOtherSecuritiesInvestments


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value108.8012.0496.382.847171583593571031901242312880.27463
Percentage of PaymentsToAcquireEquityAndOtherSecuritiesInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mtb:ProceedsFromSaleOfEquityAndOtherSecuritiesInvestments

mtb:ProceedsFromSaleOfEquityAndOtherSecuritiesInvestments


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value2.7422.526111.267512.5362912972673121.6541432502540.224147
Percentage of ProceedsFromSaleOfEquityAndOtherSecuritiesInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mtb:ReductionInEstimatedFairValueLossesOnHedgingInstruments us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

mtb:ReductionInEstimatedFairValueLossesOnHedgingInstruments

us-gaap:CashFlowHedging


Reduction
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-30
Value-65.3283-91.1-86.0-10.655965-27.02.23.5303.4-1.5
Percentage of ReductionInEstimatedFairValueLossesOnHedgingInstruments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueHedging


Reduction
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-30
Value-1.770-19.3-13.0-0.413411-55.614128312-2.9
Percentage of ReductionInEstimatedFairValueLossesOnHedgingInstruments2.624.921.215.13.824.018.1205.9645.5368.6273.7358.8193.3

mtb:RevenuesFromSubservicing us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

mtb:RevenuesFromSubservicing

mtb:BayviewFinancial


Revenues
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value3734283034373533292828282830292625232525252324263035
Percentage of RevenuesFromSubservicing100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mtb:ShareBasedCompensationExpenseNet

mtb:ShareBasedCompensationExpenseNet


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value134612111239331110189.769.7029.6135.8335.9888.5378.888-11.4098.9145.57512-0.0551110155.57211
Percentage of ShareBasedCompensationExpenseNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mtb:ShareBasedCompensationExpenseNet us-gaap:StatementEquityComponents

mtb:CommonStockIssuable


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.014-0.1790.0170.0190.016-0.2740.0190.0210.012-0.212
Percentage of ShareBasedCompensationExpenseNet0.1-0.40.10.20.1-0.70.10.20.1-1.2

us-gaap:AdditionalPaidInCapital


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value9.378-6.2547.8311010-5.1325.469119.137-7.6069.5859.039.168-15.3623.9367.1438.267-67.0168.8170.5697.724-0.9781110155.42511
Percentage of ShareBasedCompensationExpenseNet68.1-13.361.988.385.6-12.916.495.785.1-42.098.293.195.4-263.465.783.793.0587.498.910.260.11778.299.9100.0100.097.4100.0

us-gaap:RetainedEarnings


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-0.201-0.208-0.101-0.104-0.104-0.102-0.056-0.05-0.05-0.051
Percentage of ShareBasedCompensationExpenseNet-1.5-0.4-0.8-0.9-0.8-0.3-0.2-0.4-0.5-0.3

us-gaap:TreasuryStock


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value4.578534.9031.4831.88145280.51.598250.1750.6730.445212.0531.3950.623550.0995.015.1350.745
Percentage of ShareBasedCompensationExpenseNet33.2114.138.812.515.1113.884.74.314.9142.01.86.94.6363.834.316.37.0-487.91.189.939.9-1354.5

mtb:TaxableEquivalentAdjustment

mtb:TaxableEquivalentAdjustment


Taxable
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3.7323.7333.9724.0194.2345.0635.3925.5795.9255.9675.9585.7335.3974.8099.0078.8288.7367.9997.3836.7256.5226.3326.3576.2486.025.8386.0075.8415.8495.9456.1996.1056.2176.456.5076.5346.6456.7056.5356.5466.4686.3276.135.8656.1055.923
Percentage of TaxableEquivalentAdjustment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mtb:UnvestedStockBasedCompensationAwards

mtb:UnvestedStockBasedCompensationAwards


Unvested
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value918000.0877000.0-2000.0776000.0784000.0744000.0-4000.0738000.0749000.0748000.0-5000.0734000.0746000.0782000.0-15000.0898000.0913000.01036000.0-33000.01274000.01362000.01486000.024000.01419000.01462000.01493000.0-8000.01567000.01617000.01588000.0-19000.01665000.0-1712000.01780000.0-10000.01922000.01957000.01937000.011000.01903000.01854000.01791000.04000.01690000.01702000.01559000.0
Percentage of UnvestedStockBasedCompensationAwards100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mtb:ValuationChargeRecognized us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument

mtb:ValuationChargeRecognized

us-gaap:FairValueInputsLevel3, us-gaap:ResidentialMortgage


Valuation
Period End2021-03-31
Value9.0
Percentage of ValuationChargeRecognized100.0

us-gaap:AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount

us-gaap:AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount


Affordable
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value2221262626212120151616161516181414181515141518
Percentage of AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllowanceForLoanAndLeaseLossesWriteoffsNet

us-gaap:AllowanceForLoanAndLeaseLossesWriteoffsNet


Allowance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value4675972971-49.162413644223815354027244542494124423540213632282931414757364441
Percentage of AllowanceForLoanAndLeaseLossesWriteoffsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllowanceForLoanAndLeaseLossesWriteoffsNet us-gaap:FinancingReceivablePortfolioSegment

mtb:CommercialFinancialLeasing


Allowance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value294.434679.95929-13.122138.948100.7069.5934.6698.4919.7584.7445.29121111714-3.1320.902-3.358214.0568.4119.3978.072
Percentage of AllowanceForLoanAndLeaseLossesWriteoffsNet63.55.969.033.541.126.733.624.622.73.225.229.624.024.117.521.248.327.935.034.1-12.92.1-9.453.719.023.229.328.8

us-gaap:CommercialRealEstatePortfolioSegment


Allowance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value1154121.94416-0.8340.62-0.5499.2-0.543-0.369-12.6363.1111.143-4.404-5.6371.4193.9710.886-0.14-1.866-1.141-1.7430.0842.4296.0941.2620.399
Percentage of AllowanceForLoanAndLeaseLossesWriteoffsNet24.671.912.56.523.11.71.5-1.520.7-2.5-1.0-80.28.82.8-16.2-22.63.19.31.8-0.3-7.7-2.7-4.90.211.416.83.91.4

us-gaap:ConsumerPortfolioSegment


Allowance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value5.65516181725-31.77826262320262221262523182126222637381612191817
Percentage of AllowanceForLoanAndLeaseLossesWriteoffsNet12.321.719.158.136.264.664.973.652.792.370.5139.961.166.192.492.641.651.653.154.5107.888.5107.440.760.054.058.863.7

us-gaap:ResidentialPortfolioSegment


Allowance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value-0.1490.366-0.5380.556-0.279-3.4280.0061.211.7491.5421.9881.6832.1662.8441.7172.1783.1694.7524.9784.8353.1155.0852.4622.1432.0712.1292.5541.695
Percentage of AllowanceForLoanAndLeaseLossesWriteoffsNet-0.30.5-0.61.9-0.47.00.03.33.97.05.210.76.17.06.38.77.011.210.111.712.812.06.95.39.75.98.06.0

us-gaap:AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization

us-gaap:AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value191916222221171717171313131322111113111311111510.01110.01414
Percentage of AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AmortizationOfMortgageServicingRightsMSRs

us-gaap:AmortizationOfMortgageServicingRightsMSRs


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value20192026181818191716131212111413141313131212131212121616171718161515141514141513131313141414
Percentage of AmortizationOfMortgageServicingRightsMSRs100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetImpairmentCharges

us-gaap:AssetImpairmentCharges


Asset
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2.0261.2173.3222.066122.99-46.1491.526501.919172.1612.0453.1924.5512.0813.6795.1186.766.539-1.2038.943.2541.6991.6972.3791.4793.0990.8981.1171.7141.1611.48513176.829231610616301732162327
Percentage of AssetImpairmentCharges100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesDiscountRate us-gaap:FinancialInstrument

us-gaap:AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesDiscountRate

us-gaap:CommercialLoan


Assumption
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value18.00.180.180.180.180.180.18
Percentage of AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesDiscountRate100.0100.0100.0100.0100.0100.0100.0

us-gaap:ResidentialMortgage


Assumption
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value9.40.1060.1140.1220.1220.1240.1190.093
Percentage of AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesDiscountRate52.258.963.367.867.868.966.10.0

us-gaap:AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument

us-gaap:AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed

us-gaap:FairValueInputsLevel3, us-gaap:ResidentialMortgage


Assumption
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value0.3915.22-1.1817.01-0.00620.1865
Percentage of AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed100.0100.0100.0100.0100.0100.0

us-gaap:BrokerageCommissionsRevenue

us-gaap:BrokerageCommissionsRevenue


Brokerage
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value10131211101311121212121212131214161715151616151616151517171615161715141416131313141411121213
Percentage of BrokerageCommissionsRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BrokerageCommissionsRevenue us-gaap:AdjustmentsForNewAccountingPronouncements

us-gaap:AccountingStandardsUpdate201409


Brokerage
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1013121110131112121212121213
Percentage of BrokerageCommissionsRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BrokerageCommissionsRevenue us-gaap:AdjustmentsForNewAccountingPronouncements, us-gaap:StatementBusinessSegments

us-gaap:AccountingStandardsUpdate201409, mtb:RetailBanking


Brokerage
Period End2021-06-30
Value0.02
Percentage of BrokerageCommissionsRevenue0.2

us-gaap:AccountingStandardsUpdate201409, us-gaap:AllOtherSegments


Brokerage
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1013121110131112121212121213
Percentage of BrokerageCommissionsRevenue99.8100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable

mtb:PeoplesUnitedFinancialInc


Business
Period End2021-02-22
Value7700
Percentage of BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable100.0

us-gaap:BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable us-gaap:BusinessAcquisition, us-gaap:SubsequentEventType

mtb:PeoplesUnitedFinancialInc, us-gaap:SubsequentEvent


Business
Period End2021-02-22
Value0.0076
Percentage of BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable0.0

us-gaap:BusinessCombinationStepAcquisitionEquityInterestInAcquireeFairValue1 us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationStepAcquisitionEquityInterestInAcquireeFairValue1

mtb:PeoplesUnitedFinancialInc


Business
Period End2021-02-22
Value7600
Percentage of BusinessCombinationStepAcquisitionEquityInterestInAcquireeFairValue1100.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value150-292.7546313456-138.113-382.7565474.351-338.179293-57.48376-128.224522258-33.587
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtAndEquitySecuritiesGainLoss

us-gaap:DebtAndEquitySecuritiesGainLoss


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value-10.655-12.2821.6192.7736.969-20.782-6.4523.7378.911114.219-3.4152.326-9.431210.0-0.017
Percentage of DebtAndEquitySecuritiesGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0

us-gaap:DebtSecuritiesUnrealizedGainLoss

us-gaap:DebtSecuritiesUnrealizedGainLoss


Debt
Period End2021-06-302021-03-31
Value4000000.0-26000000.0
Percentage of DebtSecuritiesUnrealizedGainLoss100.0100.0

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value347000.0300000.0318000.0300000.0318000.0300000.0312000.0312000.0323000.0300000.0207000.0206000.0213000.0200000.0247000.0247000.0469000.025000.0-15000.0-15000.0-30000.0
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-22359000.0-22150000.0-15098000.0-13950000.0-15098000.0-13950000.0-5498000.0-5498000.0-6546000.0-4450000.0-10949000.0-10948000.0-10796000.0-11100000.0-7316000.0-7316000.0-7831000.0-6800000.0-7536000.0-7536000.0-6773000.0
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses-6443.5-7383.3-4747.8-4650.0-4747.8-4650.0-1762.2-1762.2-2026.6-1483.3-5289.4-5314.6-5068.5-5550.0-2961.9-2961.9-1669.7-27200.050240.050240.022576.7

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-1194000.0-1175000.0-1194000.0-1175000.0-1194000.0-1175000.0-1183000.0-1182000.0-1190000.0-1175000.0-1183000.0-1182000.0-1189000.0-1175000.0-340000.0-340000.0-329000.0-350000.0-340000.0-339000.0-330000.0
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value151000.0125000.0153000.0125000.0154000.0125000.0139000.0139000.0154000.0125000.0140000.0139000.0153000.0125000.0139000.0139000.0154000.0125000.0-807000.0-807000.0-789000.0
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit-12.6-10.6-12.8-10.6-12.9-10.6-11.7-11.8-12.9-10.6-11.8-11.8-12.9-10.6-40.9-40.9-46.8-35.7237.4238.1239.1

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value353531313131303030303030303027272727272726
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanInterestCost us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanInterestCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value0.3290.3270.4350.4360.4510.4190.5860.5860.5690.6030.5740.5730.5890.5570.9290.9290.7781.081.2431.2421.281
Percentage of DefinedBenefitPlanInterestCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value151517171717202020201818181819191919202020
Percentage of DefinedBenefitPlanInterestCost4711.94719.94104.84095.23952.14268.73480.43480.23618.63349.93253.53259.33149.13376.12133.32133.32563.41823.21677.61679.01625.4

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-0.954-0.9-0.834-0.797-0.799-0.833-0.694-0.693-0.715-0.672-0.581-0.581-0.57-0.5920.6360.6350.1821.0881.3161.3171.321
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value7.4726.7826.7155.5387.0535.2-0.179-0.1791.379-1.7384.0694.0683.8784.2585.195.196.0554.3246.7226.7236.52
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost-783.2-753.6-805.2-694.9-882.7-624.225.825.8-192.9258.6-700.3-700.2-680.4-719.3816.0817.33326.9397.4510.8510.5493.6

us-gaap:DefinedBenefitPlanServiceCost us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanServiceCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value0.2580.2480.2430.2420.2620.2230.2150.2150.2290.20.2350.2340.2430.2260.2940.2930.2020.3830.3980.3990.34
Percentage of DefinedBenefitPlanServiceCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value5.2345.0234.9864.9865.2584.7144.3244.3244.5594.0875.0885.0865.0695.1035.0485.0485.1894.9086.2596.2596.137
Percentage of DefinedBenefitPlanServiceCost2028.72025.42051.92060.32006.92113.92011.22011.21990.82043.52165.12173.52086.02258.01717.01722.92568.81281.51572.61568.71805.0

us-gaap:DerivativeGainLossOnDerivativeNet us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation, us-gaap:TradingActivityByType

us-gaap:DerivativeGainLossOnDerivativeNet

us-gaap:InterestRateSwap, us-gaap:FairValueHedging, us-gaap:DesignatedAsHedgingInstrument, mtb:FixedRateLongTermBorrowings


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value0.154-32.658-18.149-13.0670.11788-18.43522563458-12.568-13.357-42.39-28.969-13.509-5.795-4.119-9.168-12.588-7.611
Percentage of DerivativeGainLossOnDerivativeNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet us-gaap:DerivativeInstrumentRisk

us-gaap:DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet

us-gaap:InterestRateSwap


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value759110095813621-1.0-11.0-13.0-13.0-8.0-5.01.07.07.07.04.07.09.010.010.01111111111111211111110.010.0
Percentage of DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCommonStockCash

us-gaap:DividendsCommonStockCash


Dividends
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1421421411411411431451321351381391431151111121131141151091081111119393939393929292919191909089898988888884-586.847838383
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCommonStockCash us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Dividends
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1421421411411411431451321351381391431151111121131141151091081111119393939393929292919191909089898988888884-586.847838383
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsPreferredStockCash

us-gaap:DividendsPreferredStockCash


Dividends
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value171717171717171918181818181818181818202020202020202020202014131313131313131314149.54810-70.394101010
Percentage of DividendsPreferredStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsPreferredStockCash us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Dividends
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value171717171717171918181818181818181818202020202020202020202014131313131313131314149.54810-70.394101010
Percentage of DividendsPreferredStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1

mtb:OtherAssetsAndOtherLiabilities, us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value-52.312-6.025-43.837-57.819-48.732-44.081-14.211-62.178-36.463-16.546-20.049-10.284-20.277-8.13-12.008-22.313-19.571-23.94-215.79945-35.43-23.898-154.67221
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease

mtb:OtherAssetsAndOtherLiabilities, us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-03-312015-12-312015-09-30
Value375.3-7.814443332-13.83519178.5253.7234.508108.778-5.706121015-22.0322714-7.11515
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements

us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprises, us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring


Fair
Period End2021-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value0.0160.00.00.00.0060.0010.0010.0030.0010.0020.0050.0060.0030.0070.0060.0080.0090.0080.006
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements100.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3 us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3

mtb:OtherAssetsAndOtherLiabilities, us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value303552464319275526161616187.6731721231528373016
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FederalDepositInsuranceCorporationPremiumExpense

us-gaap:FederalDepositInsuranceCorporationPremiumExpense


Federal
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value171415121412129.9069.7729.4269.8371819202323252828282225191110101113151517141719232324282726261918182121
Percentage of FederalDepositInsuranceCorporationPremiumExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableAllowanceForCreditLossesRecovery

us-gaap:FinancingReceivableAllowanceForCreditLossesRecovery


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value34472522201821232422263622162622161917172216281211111415121522161912118.2911211149.43212
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableAllowanceForCreditLossesRecovery us-gaap:FinancingReceivablePortfolioSegment

mtb:CommercialFinancialLeasing


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value10224.6564.4753.3733.2613.5516.736.5067.7949.5487.1236.4094.8238.8794.4233.4334.4617.3436.958105.247175.3223.6723.9394.6747.849
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery31.647.118.619.916.617.616.428.326.133.935.519.629.129.733.920.020.822.342.538.947.031.959.941.131.734.932.752.1

us-gaap:CommercialRealEstatePortfolioSegment


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value1.1936.560.522.5781.0140.4380.4891.6560.9650.8264.8141.4370.2234.7795.8950.4341.4740.351.7042.5992.4135.8782.1191.0410.5854.831.267
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery3.513.72.111.55.02.42.37.03.93.617.840.26.51.418.326.62.67.42.09.511.514.620.316.49.05.233.88.4

us-gaap:ConsumerPortfolioSegment


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value191617141313141315121012129.6699.7969.8079.88127.2427.3197.4216.9254.84.3865.6255.7743.1253.445
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery57.834.969.064.469.071.065.858.464.054.640.435.756.259.637.444.360.062.841.940.932.842.016.633.948.651.221.922.9

us-gaap:ResidentialPortfolioSegment


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value2.4112.0332.5940.961.8881.6743.3491.5111.5141.831.6991.6551.81.512.7182.0282.731.5072.3391.9191.9751.8870.9591.1251.2380.9891.6732.498
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery7.04.310.44.39.39.015.56.36.18.06.34.68.29.310.49.216.67.513.510.78.711.53.38.710.78.811.716.6

us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs

us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value8012212252916762606945645257565347616266594658645332474643414763647648565064608866718399101
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs us-gaap:FinancingReceivablePortfolioSegment

mtb:CommercialFinancialLeasing


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value4026711432161715168.519111414139.714251624217.4876.14913267.728121415
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs49.921.958.627.635.724.227.726.023.918.829.522.625.925.725.620.640.926.136.935.616.010.521.650.623.426.030.336.9

us-gaap:CommercialRealEstatePortfolioSegment


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value1260124.522171.2721.1091.107100.2834.4311.9414.5481.3660.3750.2581.8535.4451.2361.5640.7331.2724.1352.2033.476.6796.0921.666
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs15.649.310.38.719.11.91.81.814.60.66.83.77.92.40.70.53.08.71.92.61.62.26.44.110.514.113.13.9

us-gaap:ConsumerPortfolioSegment


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value25323531394441403932373434363432283433293344432018252121
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs31.726.829.360.843.466.465.267.656.773.058.067.259.264.265.469.946.555.150.250.471.675.566.739.156.053.447.449.5

us-gaap:ResidentialPortfolioSegment


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value2.2622.3992.0561.5161.6095.1023.3552.7213.2633.3723.6873.3383.9664.3544.4354.2065.8996.2597.3176.7545.096.9723.4213.2683.3093.1184.2274.193
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs2.82.01.72.91.87.55.34.54.77.55.76.46.97.78.38.99.610.011.011.410.911.95.36.110.06.69.19.7

us-gaap:FinancingReceivableModificationsPostModificationRecordedInvestment2

us-gaap:FinancingReceivableModificationsPostModificationRecordedInvestment2


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value252129522731436639162346183058723229893943831043660239518328.38857322419130798253
Percentage of FinancingReceivableModificationsPostModificationRecordedInvestment2100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableModificationsPreModificationRecordedInvestment2

us-gaap:FinancingReceivableModificationsPreModificationRecordedInvestment2


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value2541315707315266561623461829587036291054444931063464239620359.00957322418135798555
Percentage of FinancingReceivableModificationsPreModificationRecordedInvestment2100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableModificationsPreModificationRecordedInvestment2 us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

mtb:CommercialFinancialLeasing


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value7053143355512246.1452.597306.2246.8374147171565115.889696017
Percentage of FinancingReceivableModificationsPreModificationRecordedInvestment227.840.825.247.936.119.142.837.311.065.834.523.171.368.648.753.062.426.713.274.257.250.8

mtb:HomeEquityLinesAndLoans


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value1.971.7155.5093.417.5710.7380.9861.3921.2730.4760.3981.6510.5551.3482.1642.1543.2292.5022.6812.5523.8062.831
Percentage of FinancingReceivableModificationsPreModificationRecordedInvestment20.81.31.04.75.01.11.78.55.41.02.25.61.01.96.07.23.15.66.02.73.68.1

mtb:OtherCommercialConstruction


Financing
Period End2021-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value0.5420.1030.01.0380.4180.00.00.00.7520.00.00.0660.1022.7390.00.374
Percentage of FinancingReceivableModificationsPreModificationRecordedInvestment20.20.20.04.40.90.00.00.01.10.00.00.10.26.20.00.4

mtb:OtherLoans


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value0.8361.4342.5593.0462.1830.0440.00.0490.0750.0050.0540.0260.0170.0260.620.546
Percentage of FinancingReceivableModificationsPreModificationRecordedInvestment20.31.10.44.21.40.10.00.10.20.00.10.10.00.00.61.6

mtb:RecreationalFinance


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1.1192.2122.7732.734100.090.1010.0610.0150.0880.1090.0440.00.049
Percentage of FinancingReceivableModificationsPreModificationRecordedInvestment20.41.70.53.77.10.10.20.40.10.20.60.10.00.1

mtb:ResidentialBuilderAndDeveloper


Financing
Period End2020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302019-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value0.00.00.0910.00.00.01.330.00.00.012150.023
Percentage of FinancingReceivableModificationsPreModificationRecordedInvestment20.00.00.10.00.00.02.90.00.00.027.535.40.022.4

mtb:ResidentialLimitedDocumentation


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value0.4051.1164.4330.00.02.980.3250.2360.6120.2360.2920.7160.5840.2950.5060.5151.8311.3781.1450.8270.1511.437
Percentage of FinancingReceivableModificationsPreModificationRecordedInvestment20.20.80.80.00.04.50.61.42.60.51.62.41.00.41.41.71.73.12.60.90.14.1

mtb:ResidentialRealEstateExcludingAltA


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value34391758.5448.872105.2055.1617.5133.8166.0298.1827.951129.3685.1237.9569.388.1115.6382.0064.302
Percentage of FinancingReceivableModificationsPreModificationRecordedInvestment213.430.130.811.75.815.39.131.331.98.233.427.713.718.125.817.27.621.018.26.01.912.3

us-gaap:AutomobileLoan


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value1.5024.9696.417.007260.1820.150.4850.1890.3170.3230.5260.3330.1480.2180.3420.4280.390.2590.1860.1750.644
Percentage of FinancingReceivableModificationsPreModificationRecordedInvestment20.63.81.19.617.20.30.32.90.80.71.81.80.60.20.61.10.40.90.60.20.21.8

us-gaap:CommercialRealEstatePortfolioSegment


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value14326215134139252.986109.241
Percentage of FinancingReceivableModificationsPreModificationRecordedInvestment256.320.437.918.227.459.645.218.143.919.9

us-gaap:GainLossOnDerivativeInstrumentsHeldForTradingPurposesNet

us-gaap:GainLossOnDerivativeInstrumentsHeldForTradingPurposesNet


Gain
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-1.126-1.626-1.836-3.291.695178.8839.033104.32413-0.566-0.3211.0265.090.9442.3993.7864.7146.5688.2392.186116.5611.0610.4932.062-0.6490.598-5.3322.951.9161.0030.5873.1090.851-0.3550.429-0.8934.1890.258-0.0734.333-0.7190.111-0.272
Percentage of GainLossOnDerivativeInstrumentsHeldForTradingPurposesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GainLossOnDerivativeInstrumentsHeldForTradingPurposesNet us-gaap:DerivativeInstrumentRisk

mtb:ForeignExchangeAndOtherOptionAndFuturesContracts


Gain
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value1.6181.6080.8081.4860.7174.3521.8212.5982.4791.6133.6380.7822.3652.6312.0551.3621.5681.8362.251.7462.4571.2127.7742.441-0.711-0.167-0.122-0.781-0.786-5.03-0.9-0.862-1.225-0.381-0.8990.074-2.435-0.71-3.1221.764-0.743-0.5480.268-1.532
Percentage of GainLossOnDerivativeInstrumentsHeldForTradingPurposesNet-143.7-98.9-44.0-45.242.325.420.528.822.637.326.4-138.2-736.8256.440.4144.365.448.547.726.629.855.464.937.2-67.0-33.9-5.9120.3-131.494.3-30.5-45.0-122.1-64.9-28.98.7685.9-165.5349.642.1-288.0750.76.2213.1

us-gaap:InterestRateContract


Gain
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-2.744-3.234-2.644-4.7760.978127.0626.4358.4932.71110-1.348-2.686-1.6053.035-0.4180.8311.952.4644.8225.7820.9744.2034.121.7720.662.1840.1321.384-0.3023.852.7782.2280.9684.0080.7772.081.1392.2292.4251.0010.4754.0650.813
Percentage of GainLossOnDerivativeInstrumentsHeldForTradingPurposesNet243.7198.9144.0145.257.774.679.571.277.462.773.6238.2836.8-156.459.6-44.334.651.552.373.470.244.635.162.8167.0133.9105.9-20.3231.45.7130.5145.0222.1164.9128.991.3-585.9265.5-249.657.9388.0-650.793.8-113.1

us-gaap:GainsLossesOnSalesOfAssets

us-gaap:GainsLossesOnSalesOfAssets


Gains
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value102.1064.7058.9281.8753.933-45.4643.4175.355.1715.8228.9434.1914.547256.6959.6251116365.0785.3995.7913471.0663.0881.781.1390.8523.51565562.6761.7981.2841.3152.4713.2592.543136447.424.4260.041-1.461
Percentage of GainsLossesOnSalesOfAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeLossFromEquityMethodInvestments us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:IncomeStatementLocation

us-gaap:IncomeLossFromEquityMethodInvestments

mtb:BayviewLendingGroup, mtb:OtherRevenuesFromOperations


Income
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3023230.00.00.0370.00.00.023
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0100.00.00.00.0100.00.00.00.0100.0

us-gaap:IncreaseDecreaseInDeposits

us-gaap:IncreaseDecreaseInDeposits


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-207.59386704642195147855413-343.245343312113131016-131.473-1673.269-1484.629-1099.085-26.36-3500.1741550-2640.838349044022641140315-946.804-4.543-758.79451311301581909550573-519.5551606146116391522-82.781259-178.7057456611135-11.53493
Percentage of IncreaseDecreaseInDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1

us-gaap:IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value4.122-3.1940.6990.626-3.2322.9834.38-0.36211-16.9243.0842.575-0.5050.376-0.058-4.185
Percentage of IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1 us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:FinancialInstrument

us-gaap:CashFlowHedging, mtb:InterestPaymentsOnVariableRateCommercialRealEstateLoans


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2.267-2.077-0.4650.67-3.7223.9423.861-0.57.978-12.5340.3230.932-0.0040.06
Percentage of IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments155.065.0-66.5107.0115.2132.188.2138.171.674.110.536.20.816.0

us-gaap:IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1 us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:TradingActivityByType

us-gaap:FairValueHedging, mtb:FixedRateLongTermBorrowings


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1.855-1.1171.164-0.0440.49-0.9590.5190.1383.166-4.392.7611.643-0.5010.316-0.124-4.185-2.8917.773
Percentage of IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments145.035.0166.5-7.0-15.2-32.111.8-38.128.425.989.563.899.284.0213.8100.00.00.0

us-gaap:IncreaseDecreaseInFinancialInstrumentsUsedInOperatingActivities

us-gaap:IncreaseDecreaseInFinancialInstrumentsUsedInOperatingActivities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value19-359.559-140.909-62.95256708-141.988126228170191-50.46-37.535-91.219-65.2673.34921-113.332-46.38442-18.528595.3343.191-18.40418-10.464.00512-27.893169.597.794-22.15612-12.305-4.598-7.84-20.0621020-80.805784.3913.4272.664
Percentage of IncreaseDecreaseInFinancialInstrumentsUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInLoansHeldForSale

us-gaap:IncreaseDecreaseInLoansHeldForSale


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-13.739-158.87811920262158-150.555-198.6421-202.67-102.286-503.02268372-187.76221167-712.95437997188-0.211-90.356-310.651275-197.70812631314-122.406-134.716587426-205.643396494188-154.43678-148.766205-373.02-134.91716024-252.227
Percentage of IncreaseDecreaseInLoansHeldForSale100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements


Incremental
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value171000.0132000.03000.070000.058000.059000.02000.034000.031000.031000.0-22000.0154000.0173000.0217000.0-35000.0344000.0419000.0522000.017000.0533000.0539000.0447000.0-12000.0746000.0760000.0720000.0-22000.0863000.0972000.0914000.06000.01094000.0765000.0967000.0115000.0474000.0409000.0
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InformationTechnologyAndDataProcessing

us-gaap:InformationTechnologyAndDataProcessing


Information
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value74656864616461605552505049485045444443424243
Percentage of InformationTechnologyAndDataProcessing100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestAndDividendIncomeOperating

us-gaap:InterestAndDividendIncomeOperating


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value97010161038100110321120118512291237122612201167112810821074105710301006982969970972902770760738756743734722734742750729745744737714716720688667682685684676
Percentage of InterestAndDividendIncomeOperating100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestExpenseForeignDeposits

us-gaap:InterestExpenseForeignDeposits


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.0160.1850.2330.2410.1613.4194.9226.2186.0394.7383.1541.5560.5420.3810.330.310.2810.2650.2190.2040.1810.1930.1670.1510.150.1470.1490.1610.1810.2080.2170.2130.20.3880.3490.3360.2320.2130.1870.1880.1930.3940.3520.3150.3760.325
Percentage of InterestExpenseForeignDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestExpenseShortTermBorrowings

us-gaap:InterestExpenseShortTermBorrowings


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.0010.0020.0020.0010.0020.0233.1686.9677.8936.7131.521.61.3830.8830.3630.5540.3780.2160.1510.1691.1432.1621.5750.0320.0360.0340.0250.0190.0250.0320.0450.0580.0960.2310.270.3650.3480.3030.1690.2220.1470.4920.6330.760.7260.887
Percentage of InterestExpenseShortTermBorrowings100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestExpenseTimeDeposits

us-gaap:InterestExpenseTimeDeposits


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value5.0847.011014192123252421161211101213161823272624153.6433.693.743.9153.8053.8553.944.636.1297.4848.1969.3961012131417191921232629
Percentage of InterestExpenseTimeDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestIncomeDomesticDeposits

us-gaap:InterestIncomeDomesticDeposits


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value8.716.8745.6484.1634.17918374036274126211821141212111210104.9313.8523.3513.1185.7443.1982.5351.8841.8291.651.4550.2670.1020.1390.7670.2131.2551.1640.4790.0360.0430.0340.0050.006
Percentage of InterestIncomeDomesticDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestIncomeExpenseAfterProvisionForLoanLoss

us-gaap:InterestIncomeExpenseAfterProvisionForLoanLoss


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value9571006914793632726954984986102810201013973932940927886859813811831822749648653621648640639624624625620618618616587571544558523493489476482451
Percentage of InterestIncomeExpenseAfterProvisionForLoanLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestIncomeSecuritiesTaxExempt

us-gaap:InterestIncomeSecuritiesTaxExempt


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value10000.055000.020000.059000.029000.075000.051000.098000.077000.095000.092000.0153000.0172000.0248000.0277000.0345000.0379000.0430000.0525000.0623000.0663000.0795000.0933000.0950000.01062000.01318000.01288000.01271000.01293000.01504000.01579000.01617000.01777000.01829000.01874000.02067000.02020000.02084000.02128000.02387000.02281000.02346000.02363000.02489000.02507000.02510000.0
Percentage of InterestIncomeSecuritiesTaxExempt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestIncomeSecuritiesTaxable

us-gaap:InterestIncomeSecuritiesTaxable


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value34374038475063697580788082828587929587849198999393859091857367554144495459626360607073808585
Percentage of InterestIncomeSecuritiesTaxable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet us-gaap:IncomeStatementLocation

us-gaap:InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet

us-gaap:InterestIncome


Interest
Period End2021-06-302020-06-30
Value6769
Percentage of InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet100.0100.0

us-gaap:LaborAndRelatedExpense

us-gaap:LaborAndRelatedExpense


Labor
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value479541476478458536469476455499438431418463402399398449393399398431434363361389345348339371336339323356323321323346312325300266243246245264
Percentage of LaborAndRelatedExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NoncashMergerRelatedCosts us-gaap:ProductOrService, us-gaap:BusinessAcquisition

us-gaap:NoncashMergerRelatedCosts

us-gaap:FinancialService, mtb:PeoplesUnitedFinancialInc


Noncash
Period End2021-06-302021-03-31
Value4000000.010000000.0
Percentage of NoncashMergerRelatedCosts100.0100.0

us-gaap:NoninterestExpense

us-gaap:NoninterestExpense


Noninterest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value865919845826807906823877873894802775776933795806750787769752749776786653696686680679681702743658598635626616627639739662576499469480476489
Percentage of NoninterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NoninterestIncome

us-gaap:NoninterestIncome


Noninterest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value513505551520487529521527512500480459457458484459460446465491448420448439497440451451456420446477508432453445391376398368501314286289273257
Percentage of NoninterestIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NoninterestIncome us-gaap:AdjustmentsForNewAccountingPronouncements

us-gaap:AccountingStandardsUpdate201409


Noninterest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value325309312299276318322315318296306303307297
Percentage of NoninterestIncome63.461.256.657.656.860.261.859.862.259.363.766.067.264.9

us-gaap:NoninterestIncome us-gaap:AdjustmentsForNewAccountingPronouncements, us-gaap:StatementBusinessSegments

us-gaap:AccountingStandardsUpdate201409, mtb:BusinessBanking


Noninterest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2621232219252324252325252322
Percentage of NoninterestIncome5.24.34.34.24.04.84.54.74.94.85.25.45.25.0

us-gaap:AccountingStandardsUpdate201409, mtb:CommercialBanking


Noninterest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value4035393632393938393639394038
Percentage of NoninterestIncome7.97.17.17.06.67.57.57.37.77.38.28.68.88.5

us-gaap:AccountingStandardsUpdate201409, mtb:CommercialRealEstateSegment


Noninterest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value5.3244.4296.2873.7684.1324.5046.0444.4575.5384.925.2324.8395.0944.177
Percentage of NoninterestIncome1.00.91.10.70.80.91.20.81.11.01.11.11.10.9

us-gaap:AccountingStandardsUpdate201409, mtb:DiscretionaryPortfolio


Noninterest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.3760.3840.4130.2050.150.8570.2310.5030.6410.4010.4870.3860.4130.452
Percentage of NoninterestIncome0.10.10.10.00.00.20.00.10.10.10.10.10.10.1

us-gaap:AccountingStandardsUpdate201409, mtb:ResidentialMortgageBanking


Noninterest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1.4471.7221.6311.1271.0520.9220.5790.8161.0351.0660.930.9180.931.046
Percentage of NoninterestIncome0.30.30.30.20.20.20.10.20.20.20.20.20.20.2

us-gaap:AccountingStandardsUpdate201409, mtb:RetailBanking


Noninterest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value6861666346697781797279787673
Percentage of NoninterestIncome13.312.112.012.29.613.214.915.515.514.516.517.016.816.1

us-gaap:AccountingStandardsUpdate201409, us-gaap:AllOtherSegments


Noninterest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value183183174172172176174164167157155154159156
Percentage of NoninterestIncome35.736.431.733.235.533.433.531.232.731.432.433.735.034.0

us-gaap:NoninterestIncomeOtherOperatingIncome

us-gaap:NoninterestIncomeOtherOperatingIncome


Noninterest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value11211014210787133118103112134110113100126105106117110115103104101118113150951039810296104153100961019689861489316391119777979
Percentage of NoninterestIncomeOtherOperatingIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OccupancyNet

us-gaap:OccupancyNet


Occupancy
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value80828481777982827979737773747175737469757574706866666267687168666465626465656568595650545555
Percentage of OccupancyNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value197000.0684000.02946000.03402000.0-399000.0-3225000.04044000.0-2156000.0-855000.0348000.0-1034000.0-335000.0-3080000.01632000.0618000.01327000.01770000.0732000.0-1184000.0-347000.0-2406000.0-83000.0-588000.044000.02953000.0-3732000.0-1725000.0-2793000.0713000.0-234000.0250000.01940000.0-192000.0-1452000.0257000.0760000.0-830000.0622000.0
Percentage of OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax us-gaap:StatementEquityComponents

mtb:AccumulatedOther


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value197000.0684000.02946000.03402000.0-399000.0-3225000.04044000.0-2156000.0-855000.0348000.0-1034000.0-335000.0-3080000.01632000.0618000.01327000.01770000.0732000.0-1184000.0-347000.0-2406000.0-83000.0-588000.044000.02953000.0-3732000.0-1725000.0-2793000.0713000.0-234000.0
Percentage of OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax