STBA


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:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted
us-gaap:CreditFacility
us-gaap:TierOneRiskBasedCapitalToRiskWeightedAssets
us-gaap:CreditFacility
us-gaap:CapitalToRiskWeightedAssets
us-gaap:AwardType, us-gaap:PlanName
us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxesPaidNet

us-gaap:InterestAndFeeIncomeLoansAndLeases

us-gaap:InterestExpense

us-gaap:InterestExpenseDebt

us-gaap:InterestIncomeExpenseNet

us-gaap:InterestPaidNet

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted
us-gaap:ProductOrService
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService, us-gaap:TimingOfTransferOfGoodOrService

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:StatementEquityComponents
us-gaap:CreditFacility
us-gaap:TierOneRiskBasedCapital

us-gaap:CashAndCashEquivalentsAtCarryingValue
us-gaap:ConsolidatedEntities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
us-gaap:ConsolidatedEntities

us-gaap:PropertyPlantAndEquipmentNet
us-gaap:ConsolidatedEntities
us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures

us-gaap:Goodwill
us-gaap:BusinessAcquisition

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:FiniteLivedIntangibleAssetsNet

us-gaap:DeferredTaxAssetsLiabilitiesNet

us-gaap:OperatingLeaseRightOfUseAsset

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

us-gaap:OtherAssets
us-gaap:ConsolidatedEntities

us-gaap:TimeDepositMaturitiesYearOne

us-gaap:LongTermDebt
us-gaap:ConsolidatedEntities
us-gaap:DebtInstrument

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:OperatingLeaseLiability

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

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

us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapital

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:TreasuryStockValue

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:ShareBasedCompensation

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:RepaymentsOfLongTermDebt

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:DeferredTaxAssetsNet

us-gaap:UnrecognizedTaxBenefits

us-gaap:DeferredTaxAssetsValuationAllowance
us-gaap:IncomeTaxAuthorityName

stba:BookValue
us-gaap:BusinessAcquisition
stba:BusinessCombinationAcquisitionRelatedCostsOther
us-gaap:BusinessAcquisition
stba:BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAccruedInterestPayableAndOtherLiabilities

stba:BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAcquiredReceivableFairValue
us-gaap:BusinessAcquisition
us-gaap:BusinessAcquisition
stba:BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentDeferredIncomeTaxes
us-gaap:BusinessAcquisition
stba:BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentLiabilities
us-gaap:BusinessAcquisition
stba:BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentNoncurrentLiabilitiesLongTermDebt
us-gaap:BusinessAcquisition
stba:BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherNoncurrentAssets
us-gaap:BusinessAcquisition
stba:BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentTangibleAssets
us-gaap:BusinessAcquisition
stba:BusinessCombinationProvisionalInformationInitialAccountingIncompleteIdentifiableTangibleAssetsAndLiabilitiesAssumedNet
us-gaap:BusinessAcquisition
stba:DataProcessingContractTerminationAndConversionCostExpenses

stba:FinancialReceivableTroubleDebtRestructuringReclassifiedToAccruingTroubleDebtRestructuringStatus
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
stba:FinancingReceivableAllowanceForCreditLossIncreaseDecreaseForPandemicForecast
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
stba:FinancingReceivableAllowanceForCreditLossIncreaseDecreaseForRiskComponent
us-gaap:UnusualOrInfrequentItem
stba:FinancingReceivableAllowanceForCreditLossQualitativeReservePeriodIncreaseDecrease

stba:FinancingReceivableAllowanceForCreditLossWriteoffAfterRecoveryPercent

stba:FinancingReceivableAndOffBalanceSheetLiabilityCreditLossExpenseReversal
us-gaap:FinancialInstrumentPerformanceStatus, us-gaap:UnusualOrInfrequentItem
stba:FinancingReceivableBeforeAllowanceForCreditLossPeriodIncreaseDecrease
us-gaap:FinancingReceivablePortfolioSegment
stba:FinancingReceivableBeforeAllowanceForCreditLossReclassificationDuringPeriod
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
stba:FinancingReceivableCreditLossExpenseReversalCOVID19AssessmentForecastComponent
us-gaap:UnusualOrInfrequentItem
stba:FinancingReceivableCreditLossExpenseReversalPeriodIncreaseDecrease
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:LoanRestructuringModificationName
stba:FinancingReceivableNonTDRRestructuringPostmodification
us-gaap:LoanRestructuringModificationName
us-gaap:FinancialInstrumentPerformanceStatus
stba:FinancingReceivableNonperformingAssetsPeriodIncreaseDecrease

stba:FinancingReceivableTroubledDebtRestructuringReturnedToAccruingStatus

stba:IncreaseDecreaseFinancingReceivableModificationsDifferenceInRecordedInvestments

stba:NoninterestIncomeExcludingDebtAndEquitySecuritiesGainLoss

stba:ProceedsFromRepaymentsOfOtherShortTermDebt

stba:ProceedsFromSaleOfLoansNotOriginatedForResale

stba:WeightedAverageCommonSharesOutstandingDilutedTwoClassMethod

us-gaap:AccretionAmortizationOfDiscountsAndPremiumsInvestments

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationOtherLongtermIncentivePlansRequisiteServicePeriodRecognition
us-gaap:StatementEquityComponents

us-gaap:AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount
us-gaap:IncomeStatementLocation
us-gaap:AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization

us-gaap:BusinessCombinationAcquisitionRelatedCosts
us-gaap:BusinessAcquisition
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationConsiderationTransferred1
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred

us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposure
us-gaap:OtherCommitments

us-gaap:DebtAndEquitySecuritiesGainLoss

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets

us-gaap:DefinedBenefitPlanBenefitObligationPaymentForSettlement

us-gaap:DefinedBenefitPlanContributionsByEmployer

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets

us-gaap:DefinedBenefitPlanInterestCost

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1

us-gaap:DepreciationAmortizationAndAccretionNet
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeGainLossOnDerivativeNet
us-gaap:HedgingDesignation

us-gaap:DividendIncomeOperating

us-gaap:DividendsCommonStockCash
us-gaap:StatementEquityComponents

us-gaap:EquipmentExpense

us-gaap:EquitySecuritiesFvNiGainLoss

us-gaap:EquitySecuritiesFvNiRealizedGainLoss

us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss

us-gaap:FederalDepositInsuranceCorporationPremiumExpense

us-gaap:FeesAndCommissionsMortgageBankingAndServicing

us-gaap:FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease

us-gaap:FinancingReceivableAllowanceForCreditLossesRecovery
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:FinancingReceivableModificationsPostModificationRecordedInvestment2

us-gaap:FinancingReceivableModificationsPreModificationRecordedInvestment2

us-gaap:FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1

us-gaap:FinancingReceivableNonaccrualInterestIncome
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancialInstrumentPerformanceStatus, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown

us-gaap:GainLossOnSaleOfMortgageLoans
us-gaap:BusinessAcquisition
us-gaap:GoodwillPurchaseAccountingAdjustments

us-gaap:IncreaseDecreaseInAccruedInterestReceivableNet

us-gaap:IncreaseDecreaseInDemandDeposits

us-gaap:IncreaseDecreaseInFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseNet

us-gaap:IncreaseDecreaseInInterestPayableNet

us-gaap:IncreaseDecreaseInOtherOperatingAssets

us-gaap:IncreaseDecreaseInOtherOperatingLiabilities

us-gaap:IncreaseDecreaseInTimeDeposits

us-gaap:InformationTechnologyAndDataProcessing

us-gaap:InterestAndDividendIncomeOperating

us-gaap:InterestAndFeeIncomeLoansCommercial

us-gaap:InterestExpenseDeposits

us-gaap:InterestIncomeExpenseAfterProvisionForLoanLoss

us-gaap:InterestIncomeSecuritiesTaxExempt

us-gaap:InterestIncomeSecuritiesTaxable

us-gaap:LaborAndRelatedExpense

us-gaap:MarketingExpense

us-gaap:NoninterestExpense

us-gaap:NoninterestIncome

us-gaap:NoninterestIncomeOther

us-gaap:OccupancyNet
us-gaap:StatementEquityComponents
us-gaap:OciBeforeReclassificationsBeforeTaxAttributableToParent
us-gaap:StatementEquityComponents
us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent

us-gaap:OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal
us-gaap:UnusualOrInfrequentItem
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsTax

us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1
us-gaap:StatementEquityComponents

us-gaap:OtherNoninterestExpense

us-gaap:ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic

us-gaap:PaymentsForOriginationOfMortgageLoansHeldForSale

us-gaap:PaymentsForProceedsFromFederalHomeLoanBankStock

us-gaap:PaymentsForProceedsFromLoansAndLeases

us-gaap:PaymentsForRepurchaseOfOtherEquity

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt
us-gaap:BusinessAcquisition
us-gaap:PaymentsToAcquireBusinessesGross

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities

us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesDebt

us-gaap:ProceedsFromSaleOfFederalHomeLoanBankStock

us-gaap:ProceedsFromSaleOfMortgageLoansHeldForSale

us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment

us-gaap:ProfessionalFees
us-gaap:BusinessAcquisition

us-gaap:ProvisionForLoanLossesExpensed
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:LienCategory
us-gaap:UnusualOrInfrequentItem
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAociCurrentPeriodTax

us-gaap:RepaymentsOfOtherShortTermDebt

us-gaap:ResultsOfOperationsIncomeBeforeIncomeTaxes

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability
us-gaap:BusinessAcquisition
us-gaap:SeveranceCosts1
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures

us-gaap:StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
us-gaap:StatementEquityComponents

us-gaap:TaxesOther

us-gaap:TransferOfPortfolioLoansAndLeasesToHeldForSale1

us-gaap:TransferToOtherRealEstate
us-gaap:ShareRepurchaseProgram
us-gaap:TreasuryStockAcquiredAverageCostPerShare

us-gaap:TreasuryStockValueAcquiredCostMethod
us-gaap:ShareRepurchaseProgram
us-gaap:StatementEquityComponents

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment

stba:AccumulatedOtherComprehensiveIncomeLossDebtSecuritiesAvailableForSaleGrossUnrealizedGainAdjustmentNetOfTax

stba:AccumulatedOtherComprehensiveIncomeLossDebtSecuritiesAvailableForSaleGrossUnrealizedGainAdjustmentTaxExpenseBenefit

stba:AccumulatedOtherComprehensiveIncomeLossDebtSecuritiesAvailableForSaleGrossUnrealizedLossAdjustmentTaxExpenseBenefit

stba:AccumulatedOtherComprehensiveIncomeLossDebtSecuritiesAvailableForSaleGrossUnrealizedLossesAdjustmentNetOfTax

stba:AccumulatedOtherComprehensiveIncomeLossDebtSecuritiesAvailableforsaleAdjustmentTaxExpenseBenefit
us-gaap:CreditFacility
stba:AggregateBorrowingInFederalHomeLoanBank
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
stba:AssetsHeldinTrustFairValueDisclosure
us-gaap:FairValueByMeasurementFrequency
us-gaap:BusinessAcquisition
stba:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedInterestPayableAndOtherLiabilities
us-gaap:BusinessAcquisition
stba:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsLiabilities
us-gaap:BusinessAcquisition
stba:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssetsAcquired
us-gaap:BusinessAcquisition
stba:BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDeposits
us-gaap:BusinessAcquisition
stba:BusinessCombinationRecognizedIdentifiableTangibleAssetsAcquiredAndLiabilitiesAssumedNet
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
stba:CombinedPercentageOfCommercialRealEstateAndCommercialConstructionInCommercialLoans
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
stba:CombinedPercentageOfCommercialRealEstateAndCommercialConstructionInPortfolioLoans

stba:CommitmentToLendAdditionalFunds

stba:DebtSecuritiesAvailableforsaleandEquitySecuritiesFVNI
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

stba:DeferredTaxAssetsOperatingLeaseLiability

stba:DeferredTaxLiabilitiesPurchaseAccountingAdjustments

stba:DeferredTaxLiabilitiesUnrealizedGainsLossesForAvailableForSaleSecurities
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:InternalCreditAssessment, us-gaap:UnusualOrInfrequentItem
stba:FinancingReceivableAllowanceForCreditLossQuantitativeReserve
us-gaap:Collateral, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:UnusualOrInfrequentItem
stba:FinancingReceivableAllowanceForCreditLossSpecificReserve
us-gaap:UnusualOrInfrequentItem

stba:FinancingReceivableBeforeAllowanceForCreditLossAndHeldForSaleNotPartOfADisposalGroup
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
stba:FinancingReceivableNonaccrualHeldForSale

stba:FinancingReceivableNonaccrualIncludingHeldForSale

stba:FinancingReceivableRecordedInvestmentNonPerforming

stba:FinancingReceivableRecordedInvestmentNonaccrualTroubleDebtRestructured
us-gaap:FinancialInstrumentPerformanceStatus, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
stba:FinancingReceivablesImpairedTroubledDebtRestructuringAfterWriteDown

stba:InterestReceivableDebtSecuritiesAvailableForSale
us-gaap:ConsolidatedEntities
stba:InvestmentsInNonBankSubsidiary

stba:LesseeOperatingAndFinanceLeaseLiabilityPaymentsDue

stba:LesseeOperatingAndFinanceLeaseLiabilityPaymentsDueAfterYearFive

stba:LesseeOperatingAndFinanceLeaseLiabilityPaymentsDueNextTwelveMonths

stba:LesseeOperatingAndFinanceLeaseLiabilityPaymentsDueYearFive

stba:LesseeOperatingAndFinanceLeaseLiabilityPaymentsDueYearFour

stba:LesseeOperatingAndFinanceLeaseLiabilityPaymentsDueYearThree

stba:LesseeOperatingAndFinanceLeaseLiabilityPaymentsDueYearTwo

stba:LesseeOperatingAndFinanceLeaseLiabilityUndiscountedExcessAmount
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:MeasurementInputType, us-gaap:ValuationTechnique
stba:LoansReceivableMeasurementInput
us-gaap:Range, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:MeasurementInputType, us-gaap:ValuationTechnique

stba:LongTermDebtAverageInterestRateAfterYearFive

stba:LongTermDebtAverageInterestRateInYearFive

stba:LongTermDebtAverageInterestRateInYearFour

stba:LongTermDebtAverageInterestRateInYearThree

stba:LongTermDebtAverageInterestRateInYearTwo

stba:LongtermDebtAverageInterestRate

stba:LongtermDebtAverageInterestRateInNextTwelveMonths
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
stba:NetLoansOutOfStatePercentageExcludingContiguousStates

stba:NetNonperformingAssets

stba:OperatingAndFinanceLeaseLiability
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:ValuationTechnique
stba:OtherRealEstateOwnedFairValueDisclosure
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
stba:OutOfStateExposureOfCombinedPortfolio
us-gaap:FinancingReceivablePortfolioSegment
stba:PercentageOfCommercialLoansInPortfolioLoans
us-gaap:FinancialInstrument
stba:PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesAmortizedCost

stba:PortfolioLoansFairValueDisclosure

stba:SubordinatedBorrowingsAllowableinComputationofNetCapital1

us-gaap:AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
us-gaap:UnusualOrInfrequentItem
us-gaap:AllowanceForNotesAndLoansReceivableCurrent

us-gaap:AmortizationMethodQualifiedAffordableHousingProjectInvestments
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:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
us-gaap:FinancialInstrument
us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost
us-gaap:FinancialInstrument
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:BankOwnedLifeInsurance
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationAcquiredReceivablesFairValue
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
us-gaap:BusinessAcquisition, us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
us-gaap:CreditFacility
us-gaap:Capital
us-gaap:CreditFacility
us-gaap:CapitalRequiredForCapitalAdequacy
us-gaap:CreditFacility
us-gaap:CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
us-gaap:CreditFacility
us-gaap:CapitalRequiredToBeWellCapitalized
us-gaap:CreditFacility
us-gaap:CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:CashAndCashEquivalentsFairValueDisclosure
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:CashSurrenderValueFairValueDisclosure
us-gaap:FairValueByMeasurementBasis
us-gaap:CreditFacility
us-gaap:CommonEquityTierOneCapital
us-gaap:CreditFacility
us-gaap:CommonEquityTierOneCapitalRatio
us-gaap:CreditFacility
us-gaap:CommonEquityTierOneCapitalRequiredForCapitalAdequacy
us-gaap:CreditFacility
us-gaap:CommonEquityTierOneCapitalRequiredToBeWellCapitalized

us-gaap:DebtLongtermAndShorttermCombinedAmount

us-gaap:DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedGainLossBeforeTax

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleExcludingAccruedInterest
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:FairValueByMeasurementFrequency
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us-gaap:FairValueByMeasurementBasis
us-gaap:CreditFacility
us-gaap:TierOneLeverageCapital
us-gaap:CreditFacility
us-gaap:TierOneLeverageCapitalRequiredForCapitalAdequacy
us-gaap:CreditFacility
us-gaap:TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
us-gaap:CreditFacility
us-gaap:TierOneLeverageCapitalRequiredToBeWellCapitalized
us-gaap:CreditFacility
us-gaap:TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
us-gaap:CreditFacility
us-gaap:TierOneLeverageCapitalToAverageAssets
us-gaap:CreditFacility
us-gaap:TierOneRiskBasedCapitalRequiredForCapitalAdequacy
us-gaap:CreditFacility
us-gaap:TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
us-gaap:CreditFacility
us-gaap:TierOneRiskBasedCapitalRequiredToBeWellCapitalized
us-gaap:CreditFacility
us-gaap:TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets

us-gaap:TimeDepositMaturitiesAfterYearFive

us-gaap:TimeDepositMaturitiesYearFive

us-gaap:TimeDepositMaturitiesYearFour

us-gaap:TimeDepositMaturitiesYearThree

us-gaap:TimeDepositMaturitiesYearTwo

us-gaap:TimeDeposits

us-gaap:TimeDeposits100000OrMore

us-gaap:TimeDepositsAtOrAboveFDICInsuranceLimit
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:TradingSecurities
us-gaap:FairValueByMeasurementBasis

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate

us-gaap:ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance

Plots across concepts


IncomeStatement
Net Income Loss
Expenses
Interest Expense
Balance Sheet
Intangible Assets Net Excluding Goodwill
Assets
Operating Lease Right Of Use Asset
Current Assets
Cash And Cash Equivalents At Carrying Value
NonCurrent Assets
Intangible Assets Net Excluding Goodwill
Liabilities
Operating Lease Liability
Noncurrent Liabilities
Long Term Debt
Stockholders Equity
Accumulated Other Comprehensive Income Loss Net Of Tax
Per Share
Common Stock Dividends Per Share Declared
CashFlow
Payments To Acquire Property Plant And Equipment
NetCashProvidedByUsedInOperatingActivities
Share Based Compensation
NetCashProvidedByUsedInInvestingActivities
Payments To Acquire Property Plant And Equipment
NetCashProvidedByUsedInFinancingActivities
Payments For Repurchase Of Common Stock
Shares
Weighted Average Number Of Shares Outstanding Basic
DividendsAndRepurchase
Payments For Repurchase Of Common Stock
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Payments Due Year Four
FiniteLivedIntangibleAssets
Finite Lived Intangible Assets Net
BanksAndOrInsurance
Securities Sold Under Agreements To Repurchase
LiabilitiesBanks
Short Term Borrowings

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:CommonStockValue ███████▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁103.623103.623103.623103.623103.623103.623103.62390.32690.32690.32690.32690.32690.32690.32690.32690.32690.32690.32690.32690.32690.32690.32690.32690.32690.32690.32677.99377.99377.99377.99377.99377.99377.99377.99377.99377.99376.01175.96874.28574.28574.285NA74.285NANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding █▁39.13956139.12113NA39.04146739.01316139.379656NA34.17028134.21098634.542811NA35.01929235.05757634.999165NA34.96013934.90649634.912261NA34.76850534.76456534.739514NA34.69299234.68117831.260948NA29.71461229.70119429.698047NA29.685629.67787629.674406NA29.27723228.81075428.272569NA28.02527.984NANA27.81327.797
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic █▁39.04897139.021208NA39.02081139.01316139.27154NA34.09077934.15813634.414555NA34.79917434.7931634.756726NA34.75126634.72492534.69025NA34.68748734.67471234.661016NA34.66000734.65289531.232075NA29.69341729.684329.660794NA29.65806529.65401829.621453NA29.24458828.79120728.25745NA28.00327.968NANA27.827.77
 us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities us-gaap:RestrictedStock▁█2.5e-050.165NA0.0194490.0213334.1e-05NA0.0002540.0051830.068314NA0.1134510.0899740.090298NA0.0925770.1263320.079544NA0.1466950.1449980.08184NA0.1189870.1228510.082901NA0.0817850.0420790.036984NA0.0527050.0511360.055296NA0.0487170.0664220.030783NA0.0649780.075015NANANANA
us-gaap:EarningsPerShareBasic ▇█▇▆▁▆▇█▇▇██▇▇▆▇▇▇▆▇▆▆▆▇▇▆▆▆▆▆▆▆▆▆▆▆▆▅▆▆▆▅▆▆▆0.730.810.620.43-0.850.340.61999999999999970.790.760.670.770.890.620.750.270.650.660.520.510.590.490.460.50.540.520.410.490.490.490.470.39999999999999990.410.470.410.329999999999999960.430.30.120.329999999999999850.440.480.170.310000000000000050.390.28
us-gaap:EarningsPerShareDiluted ▇█▇▆▁▆▇██▇██▇▇▆▇▇▇▇▇▆▆▆▇▇▆▆▆▆▆▆▆▆▆▆▆▆▅▆▆▆▅▆▆▆0.720.810.620.43-0.850.340.620.790.760.660.770.880.610.750.270.650.650.520.510.590.490.460.50.540.520.410.490.490.490.470.40.410.470.410.320.430.30.120.330.440.480.170.310000000000000050.390.28
 us-gaap:TierOneRiskBasedCapitalToRiskWeightedAssets us-gaap:CreditFacility stba:SAndTBankNANA1.1550000000000001e-05NANANA1.1559999999999999e-07NANANA1.1229999999999999e-07NANANA1.029e-07NANANA9.71e-08NANANA9.55e-08NANANA1.076e-07NANANA1.1360000000000001e-07NANANA1.088e-07NANANA1.055e-07NANANANANANA
 us-gaap:TierOneRiskBasedCapitalToRiskWeightedAssets us-gaap:CreditFacility stba:SavingsAndTrustNANA1.174e-05NANANA1.184e-07NANANA1.172e-07NANANA1.106e-07NANANA1.0390000000000001e-07NANANA1.015e-07NANANA1.234e-07NANANA1.237e-07NANANA1.198e-07NANANA1.163e-07NANANANANANA
 us-gaap:CapitalToRiskWeightedAssets us-gaap:CreditFacility stba:SAndTBankNANA1.3140000000000001e-05NANANA1.281e-07NANANA1.1229999999999999e-07NANANA1.176e-07NANANA1.115e-07NANANA1.1e-07NANANA1.268e-07NANANA1.335e-07NANANA1.4349999999999998e-07NANANA1.411e-07NANANANANANA
 us-gaap:CapitalToRiskWeightedAssets us-gaap:CreditFacility stba:SavingsAndTrustNANA1.344e-05NANANA1.322e-07NANANA1.138e-07NANANA1.255e-07NANANA1.186e-07NANANA1.16e-07NANANA1.427e-07NANANA1.4360000000000002e-07NANANA1.5390000000000002e-07NANANA1.5199999999999998e-07NANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
 us-gaap:AllocatedShareBasedCompensationExpense us-gaap:AwardType,us-gaap:PlanName us-gaap:RestrictedStock,stba:A2014StockPlanModifiedNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTax ▇▇▇▆▁▇▆▇█▇█▇▆▆▄▇▆▆▅▆▆▇▅▆▆▆▅▆▆▆▆▅▅▅▅▆▅▄▄▆▆▅30.91123.99223.71416.926-29.51230.57317.91229.14233.51329.10437.028.57320.44414.6373.47122.97522.50319.3769.51819.68620.42724.43410.70222.4214.69516.647.83513.51518.34317.07920.33312.8746.65111.5697.41314.5149.2973.5020.06715.93217.2516.24NANANA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments ██▇▆▁▆▇▇▇▇▇█▇▇▇▇▇▇▇▇▇▇▇▇▇▆▆▆▆▆▆▆▆▆▆▆▆▅▆▆▆▅▆▆▆35.33839.17829.87820.028-44.86515.99827.3631.67931.17127.1531.80633.75725.44632.1731.54931.60431.36924.88324.16927.94822.55522.02424.23725.04224.68617.51518.45919.56619.59517.80415.95716.45418.05414.55211.92515.2189.9834.33516.63218.48418.9617.80913.64216.08213.292
us-gaap:IncomeTaxExpenseBenefit ▅▅▅▄▁▄▄▄▄▄▄▄▄▅█▅▅▅▅▅▅▅▅▅▅▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄6.9717.2765.7023.323-11.7932.7675.0914.7435.074.2224.9522.8764.016.00722.2558.8838.6046.6956.517.3675.4965.9316.8146.4076.4984.683.9634.9064.8753.7714.0984.2073.9512.2222.42.6231.3830.8554.3764.6814.0511.5143.3523.63.888
us-gaap:IncomeTaxesPaidNet ▇▁▁▄▁▁▃▅▃▂▁▃▇▁█▅█▁▆▃▇▂▅▄▅▂▄▃▅▁▄▃▄▁▂11.90.1970.0216.00.00.213.4856.6213.1251.4320.04.62510.9950.10812.7187.69713.2270.1728.7694.511.681.7947.56.47.7751.55.1754.58.40.05.02.9755.2-0.0452.669NANANANANANANANANANA
us-gaap:InterestAndFeeIncomeLoansAndLeases ▆▆▆▇▇█▇▇▇▇▆▆▆▅▅▅▅▄▄▄▄▃▃▃▃▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▂▂▂▂▂66.94270.23271.14872.26375.49882.05177.42575.0874.72873.39271.51568.63166.6163.05563.40762.4560.55856.955.16853.95652.01951.15849.57449.57848.93339.92737.79737.23336.61435.64935.94935.73335.76535.04536.12736.12136.59636.33737.40138.10338.96839.64941.80642.71842.662
us-gaap:InterestExpense ▁▁▂▃▄▇████▇▆▆▅▄▄▃▃▃▂▂▂▂▁▁▁▁▁▁▁▁▁▁▂▂▂▂▂▂▃▃▃▃▃▄3.2734.1225.627.57210.33117.55318.04518.61718.79718.23416.74714.36513.17811.09710.0279.2678.3447.2726.6386.3536.1425.3824.4684.0733.83.6573.3153.0763.0173.0743.1253.3073.9574.1744.6295.0255.5515.8196.1926.9767.2457.327.8768.3528.936
us-gaap:InterestExpenseDebt ▁▁▂▂▂▄▄▅▅▆█▇█▆▆▅▅▄▃▂▂▂▂▂▁▁▁▁▁▁▁▁▂▂▂▂▂▂▂▂▃▂0.6210.6410.8250.9461.1042.2152.2612.412.7423.2533.7743.4944.0123.2512.82.5192.3681.8931.3491.2341.1131.1280.8570.7980.7490.650.6520.5960.5410.5640.5890.591.0060.9721.0171.0671.0761.0681.0041.2311.2881.258NANANA
us-gaap:InterestIncomeExpenseNet ██████▇▆▆▆▆▆▆▅▆▆▅▅▅▄▄▄▄▄▄▂▂▂▂▁▂▁▁▁▂▁▁▁▂▁▁▁▂▂▂68.30470.65969.92869.27670.14870.03664.41261.19660.82760.35659.84259.26258.40356.93257.82857.45656.5753.87852.45851.45549.70849.63748.88549.59648.81140.25938.06737.52936.85535.59138.77935.27434.59633.66938.9233.79533.81933.32140.25933.86934.53834.87236.33436.97336.625
us-gaap:InterestPaidNet ▁▂▂▃▅▇▇▇██▆▆▅▅▃3.7465.3686.9167.71611.92617.79518.23118.43519.58919.02315.19714.26211.75911.8178.909NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLoss ██▇▆▁▆▇▇▇▇▇█▇▇▆▇▇▇▆▇▆▆▆▇▇▆▆▆▆▆▆▆▆▆▆▆▅▅▆▆▆▅▆▆▆28.36731.90224.17616.705-33.07213.23122.26926.93626.10122.92826.85430.88121.43626.1639.29422.72122.76518.18817.65920.58117.05916.09317.42318.63518.18812.83514.49614.6614.7214.03311.85912.24714.10312.339.52412.5958.63.4812.25613.80314.916.29510.2912.4829.404
us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic ██▇▆▁▆▇▇▇▇▇█▇▇▆▇▇▇▆▇▆▆▆▇▇▆▆▆▆▆▆▆▆▆▆▆▅▅▆▆▆▅▆▆▅28.22631.76124.10816.653-33.07213.20222.26926.86426.02922.86626.85430.79421.37426.0839.29422.64822.68418.12817.65920.51316.99916.05217.42318.55418.10912.78914.49714.60914.69113.99811.85912.21414.06712.2859.52412.5958.63.489.31712.24413.3524.748.73710.9317.855
us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted ▁█28.36731.902NA16.705-33.07213.231NA26.93626.10122.928NA30.88121.43626.163NA22.72122.76518.18817.65920.58117.05916.09317.42318.63518.18812.83514.49614.6614.7214.03311.85912.24714.10312.339.52512.5958.63.48NANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService stba:WealthManagement█▇▄▄▄▃▃▁▁▁▃▄▅▅▄▃▃3.1672.9442.4862.5222.5862.3622.4132.1012.0622.0482.3022.4832.6162.6822.5212.4062.428NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService us-gaap:CreditAndDebitCard▁█▇█▆▆▆▆▆▅▅▅▆▅▅▅▅1.7344.1623.8294.1713.6123.4823.4543.4753.5012.9743.1923.1413.3093.0373.0773.0673.042NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService us-gaap:DepositAccount█▇▄▄▁█▇▇▆▅▆▆▆▆▆▆▅3.6423.4742.9842.822.3423.5583.5393.4123.2123.1533.3313.3513.2273.2413.243.2072.997NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService,us-gaap:TimingOfTransferOfGoodOrService stba:WealthManagement,us-gaap:TransferredAtPointInTimeNANA0.5110.531.9342.0180.4650.3981.6530.4130.7060.6691.8230.803NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService,us-gaap:TimingOfTransferOfGoodOrService stba:WealthManagement,us-gaap:TransferredOverTimeNANA1.9751.9920.6520.3451.9481.7030.4091.6351.5961.8150.7931.879NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService,us-gaap:TimingOfTransferOfGoodOrService us-gaap:CreditAndDebitCard,us-gaap:TransferredAtPointInTimeNANA3.6473.9933.4283.2873.2733.2953.3242.7893.0312.9833.1582.849NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService,us-gaap:TimingOfTransferOfGoodOrService us-gaap:CreditAndDebitCard,us-gaap:TransferredOverTimeNANA0.1820.1780.1840.1940.1810.180.1770.1850.160.1580.1510.188NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService,us-gaap:TimingOfTransferOfGoodOrService us-gaap:DepositAccount,us-gaap:TransferredAtPointInTimeNANA2.5342.3971.9023.0743.0612.9392.7612.6962.6043.0392.7742.708NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService,us-gaap:TimingOfTransferOfGoodOrService us-gaap:DepositAccount,us-gaap:TransferredOverTimeNANA0.450.4230.440.4840.4780.4730.4510.4570.7280.3120.4530.533NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService,us-gaap:TimingOfTransferOfGoodOrService us-gaap:ProductAndServiceOther,us-gaap:TransferredAtPointInTimeNANA0.9510.978NANA0.9080.864NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:Assets ██▇██▇▇▆▅▅▅▅▅▅▅▅▅▅▅▄▄▄▄▄▄▃▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁9495.8329328.9798967.8979190.5729474.2969005.4968764.6497571.9917334.6057229.2627252.2217105.3637097.3467005.3297060.2557170.1797086.1667065.0986943.0536718.2056674.2056479.1626318.3546215.3386133.7285971.2934964.6864906.7444788.034706.9874533.194588.1284528.7594479.8634526.7024422.2584347.3924330.9754119.9944091.974058.29NA4114.339NANA
us-gaap:Liabilities ██▇██▇▇▅▅▅▅▅▅▅▅▅▅▅▅▄▄▄▄▄▄▄▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁8307.0998160.7017813.1868048.4578338.5197829.2457572.6516589.5446369.6526286.1066316.466185.5826190.2136109.9226176.2246282.6036215.1046209.9186101.0975879.4985849.1555668.3615526.1175427.5355362.4995209.0354356.2974300.8474190.8434123.3363961.8844032.73981.9073935.2493989.283888.0163836.8163826.5573629.4683488.2963465.753NA3535.674NANA
us-gaap:LiabilitiesAndStockholdersEquity ██▇██▇▇▆▅▅▅▅▅▅▅▅▅▅▅▄▄▄▄▄▄▃▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁9495.8329328.9798967.8979190.5729474.2969005.4968764.6497571.9917334.6057229.2627252.2217105.3637097.3467005.3297060.2557170.1797086.1667065.0986943.0536718.2056674.2056479.1626318.3546215.3386133.7285971.2934964.6864906.7444788.034706.9874533.194588.1284528.7594479.8634526.7024422.2584347.3924330.9754119.9944091.974058.29NA4114.339NANA
us-gaap:StockholdersEquity ████▇██▆▆▆▅▅▅▅▅▅▅▅▅▄▄▄▄▄▄▄▂▂▂▂▂▂▂▂▁▁▁▁▁▂▂1188.7331168.2781154.7111142.1151135.7771176.2511191.998982.447964.953943.156935.761919.781907.133895.407884.031887.576871.062855.18841.956838.707825.05810.801792.237787.803771.229762.258608.389605.897597.187583.651571.306555.428546.852544.614537.422534.242510.576504.418490.526603.674592.537NA578.665NANA
 us-gaap:TierOneRiskBasedCapital us-gaap:CreditFacility stba:SAndTBankNANA810.636NANANA832.113NANANA659.304NANANA582.929NANANA542.048NANANA502.114NANANA403.593NANANA389.584NANANA343.331NANANA321.352NANANANANANA
 us-gaap:TierOneRiskBasedCapital us-gaap:CreditFacility stba:SavingsAndTrustNANA825.515NANANA854.146NANANA689.778NANANA628.876NANANA582.155NANANA535.234NANANA465.114NANANA426.234NANANA392.506NANANA356.484NANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:CashAndCashEquivalentsAtCarryingValue █▆▂▃▃▂▂▂▁▁▂▁▂▁▁▁▁▁▂▁▁▁▁▁▂▁▁▂▁▂▁▂▂▂▃▃▄▃▃▂▂▁▁▁▁985.278671.429229.666308.489351.365187.684197.823173.609122.876116.82155.489132.65137.933112.849117.152114.44125.863104.705139.486125.16394.991121.66999.399115.347146.582124.737109.58143.831130.235185.303108.356234.928247.432261.124337.711347.076403.244386.64270.526262.406170.826108.855108.19688.15771.15
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents █▅▂▃▃▂▂▁▁▁▁▁▁▁▁985.278671.429229.666308.489351.365187.684197.823173.609122.876116.82155.489132.65137.933112.849117.152NANANA139.486NANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:PropertyPlantAndEquipmentNet NANANA56.25456.44156.65956.9441.87641.68842.19941.7341.40340.88941.63542.70242.88845.01945.32244.99947.12247.02548.39549.12749.10649.03249.6638.16637.2436.66536.23936.61537.79237.47337.97538.67639.27339.60539.97937.75538.72939.434NA39.954NANA
 us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures us-gaap:ConsolidatedEntities srt:ParentCompanyNANA1168.831NANANA1198.964NANANA925.286NANANA857.293NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:Goodwill ███████▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁373.424373.424373.424373.417373.289374.27371.621287.446287.446287.446287.446287.446287.446287.446291.67291.67291.67291.67291.67291.67291.67291.67291.764291.683291.204290.617175.82175.82175.82175.82175.82175.82175.82175.82175.733175.733171.457171.395165.273165.273165.273NA165.273NANA
us-gaap:IntangibleAssetsNetExcludingGoodwill ▆▆▆▇▇▇█▁▁▁▁▂▂▂▂▂▃▃▃▄▄▄▅▅▅▆▁▂▂▂▂▃▃▃▄▄▄▄▄▄▅7.7718.2118.6759.2659.74310.28710.9192.0922.2552.4182.6012.7252.9093.1263.6773.9564.1914.5524.915.2825.6576.0676.5257.07.4797.9962.6312.8863.1463.4433.7594.1284.5064.9195.355.7835.7696.2025.7286.1426.556NA7.465NANA
us-gaap:FiniteLivedIntangibleAssetsNet NANA8.675NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:DeferredTaxAssetsLiabilitiesNet NANA18.193NANANA13.206NANANA17.209NANANA20.579NANANA32.812NANANA34.749NANANA28.686NANANA29.751NANANA27.843NANANA23.324NANANANANANA
us-gaap:OperatingLeaseRightOfUseAsset NANA46.245NANANA47.68637.53436.41735.686NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:EquitySecuritiesFvNi ▁▅▅▄▄▅█▇▇▇▇██1.0963.4163.33.2492.6633.5665.154.7064.5514.4984.8165.3145.425NA5.144NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:TimeDepositMaturitiesYearOne NANA1182.938NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:LongTermDebt NANANA113.144113.542114.218115.145114.775115.41116.037115.93391.05391.68192.30392.9258.5359.13759.73760.33260.92261.507162.087162.662163.232163.84769.45765.06165.66166.25566.84567.42968.00968.58423.53534.10140.66935.21831.42631.87432.31932.759NA29.365NANA
 us-gaap:LongTermDebt us-gaap:ConsolidatedEntities srt:ParentCompanyNANA39.317NANANA39.277NANANA20.619NANANA20.619NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LongTermDebt us-gaap:DebtInstrument us-gaap:JuniorSubordinatedDebtNANANA64.06864.05364.03864.27745.61945.61945.61945.61945.61945.61945.61945.619NA45.61945.61945.61945.61945.61945.61945.61945.61945.61950.61945.61945.61945.61921.22621.8145.61945.619NA90.619NANANANANANANANANANA
 us-gaap:LongTermDebt us-gaap:DebtInstrument us-gaap:LongTermDebtNANANA49.07649.48950.1850.86869.15669.79170.41870.31445.43446.06246.68447.301NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo NANA4.855NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree NANA4.759NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour NANA4.752NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive NANA4.787NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive NANA66.409NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:StockholdersEquity ████▇██▆▆▆▅▅▅▅▅▅▅▅▅▄▄▄▄▄▄▄▂▂▂▂▂▂▂▂▁▁▁▁▁▂▂1188.7331168.2781154.7111142.1151135.7771176.2511191.998982.447964.953943.156935.761919.781907.133895.407884.031887.576871.062855.18841.956838.707825.05810.801792.237787.803771.229762.258608.389605.897597.187583.651571.306555.428546.852544.614537.422534.242510.576504.418490.526603.674592.537NA578.665NANA
us-gaap:CommonStockValue ███████▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁103.623103.623103.623103.623103.623103.623103.62390.32690.32690.32690.32690.32690.32690.32690.32690.32690.32690.32690.32690.32690.32690.32690.32690.32690.32690.32677.99377.99377.99377.99377.99377.99377.99377.99377.99377.99376.01175.96874.28574.28574.285NA74.285NANA
us-gaap:AdditionalPaidInCapital ███████▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁402.053401.353400.668400.789400.417400.387399.944212.04211.325210.949210.345209.685216.885216.618216.106215.451214.941214.1213.098212.407211.824211.276210.545210.141209.709209.1578.81878.81678.5778.32578.1477.83577.67277.54177.45877.2365.80565.11652.63752.452.104NA51.57NANA
us-gaap:RetainedEarningsAccumulatedDeficit █▇▇▇▇███▇▇▇▆▆▆▅▅▅▅▅▄▄▄▄▃▃▃▃▃▃▂▂▂▂▂▂▁▁▁▁▁▁746.472731.718710.061698.351692.24740.726761.083748.28730.577716.078701.819684.361662.112649.925628.107626.283610.504595.105585.891575.192561.132551.229544.228533.442521.056509.575504.06494.909485.277477.79468.158461.044453.258444.115436.039430.936422.731419.263421.468416.616408.868NA401.734NANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▇▇███▇▅▅▅▄▃▁▁▂▃▄▄▄▄▆▆▅▄▅▄▅▄▅▅▅▄▃▃▄▄▅▄▄▄▆▆3.6051.0618.9719.4539.2325.672-11.67-7.313-9.519-16.931-23.107-33.253-30.945-29.953-18.427-12.604-12.858-12.596-13.784-5.643-4.748-8.116-16.457-9.736-13.521-10.028-13.833-7.172-6.026-9.648-12.694-21.168-21.795-14.343-13.582-11.47-13.389-14.086-14.108-1.919-4.048NA-6.334NANA
us-gaap:TreasuryStockValue ▇▇▇▇▇█▆▆▅▅▃▁▁▁▁▁▁▁▁▁▁▁▂▂▂▂▂▂▂▃▂▂▂▃▃▃▃▃▃▃▃67.0269.47768.61270.10169.73574.15760.98260.88657.75657.26643.62231.33831.24531.50932.08131.8831.85131.75533.57533.57533.48433.91436.40536.3736.34136.76538.64938.64938.62740.80940.29140.27640.27640.69240.48640.44740.58241.84343.75644.44145.204NA48.727NANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:NetCashProvidedByUsedInOperatingActivities ▆█▆▅▅▁▆▅▅▅▆▅▅▆▅▅▅▅▅▅▅▅▄▅▄▅▅▄▅▅▅▅▅▄▄▅▅▅▅▅▅▄▅▅37.89890.14556.45328.56628.393-59.96145.62933.89828.43730.45942.83220.69226.70237.79130.80531.31221.81230.30724.40528.39718.32825.666-1.05536.4195.9319.2919.64514.68821.40522.36518.15922.69630.76714.4545.38936.0926.1916.22115.5527.67618.11812.55833.79215.512NA
us-gaap:NetCashProvidedByUsedInInvestingActivities ▇▅▇█▁▄▆▃▄▆▄▅▄▆▆▄▅▃▂▅▃▄▄▄▄▅▄▄▄▄▄▄▄▅▄▅▅▇▅▆▆▅▅▆146.988-19.65299.82223.359-358.644-125.63620.282-170.828-83.71123.701-137.815-18.454-73.85228.15757.449-101.935-1.417-166.512-234.48-23.742-222.699-135.732-102.238-124.93-134.832-43.737-87.944-109.075-139.592-100.437-83.143-84.815-89.028-52.697-110.841-6.976-10.876120.37-20.83150.71594.2437.613-15.25657.695NA
us-gaap:NetCashProvidedByUsedInFinancingActivities ▅▇▂▁█▅▃▅▄▃▅▄▄▃▃▄▄▅▆▄▅▅▄▄▅▄▄▅▄▅▃▄▄▃▄▃▄▃▄▄▃▃▄▃128.963371.27-235.096-294.801493.932175.458-41.697187.66361.33-92.829117.822-7.52172.234-70.251-85.54259.20.763101.424224.39825.517177.693132.33687.34557.276150.74739.60434.048107.98363.119155.019-61.58849.61544.569-38.34496.087-85.2821.29-20.47713.40113.189-50.39-19.5121.454-56.2NA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect ▆█▁▁▄▂▂▃▂▂▂▂▂▂313.849441.763-78.823-42.876163.681-10.13924.21450.7336.056-38.66922.839-5.28325.084-4.303NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:NetCashProvidedByUsedInOperatingActivities ▆█▆▅▅▁▆▅▅▅▆▅▅▆▅▅▅▅▅▅▅▅▄▅▄▅▅▄▅▅▅▅▅▄▄▅▅▅▅▅▅▄▅▅37.89890.14556.45328.56628.393-59.96145.62933.89828.43730.45942.83220.69226.70237.79130.80531.31221.81230.30724.40528.39718.32825.666-1.05536.4195.9319.2919.64514.68821.40522.36518.15922.69630.76714.4545.38936.0926.1916.22115.5527.67618.11812.55833.79215.512NA
us-gaap:NetIncomeLoss ██▇▆▁▆▇▇▇▇▇█▇▇▆▇▇▇▆▇▆▆▆▇▇▆▆▆▆▆▆▆▆▆▆▆▅▅▆▆▆▅▆▆▆28.36731.90224.17616.705-33.07213.23122.26926.93626.10122.92826.85430.88121.43626.1639.29422.72122.76518.18817.65920.58117.05916.09317.42318.63518.18812.83514.49614.6614.7214.03311.85912.24714.10312.339.52412.5958.63.4812.25613.80314.916.29510.2912.4829.404
us-gaap:ShareBasedCompensation NANA-0.1210.3720.030.4430.6210.840.3760.6040.660.4520.2670.5120.6550.510.8411.0020.6820.5830.5480.7310.4780.3890.5290.240.3810.1990.260.1350.1790.2540.1370.1170.230.2050.370.1080.3240.2530.2020.1810.2860.064NA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:NetCashProvidedByUsedInInvestingActivities ▇▅▇█▁▄▆▃▄▆▄▅▄▆▆▄▅▃▂▅▃▄▄▄▄▅▄▄▄▄▄▄▄▅▄▅▅▇▅▆▆▅▅▆146.988-19.65299.82223.359-358.644-125.63620.282-170.828-83.71123.701-137.815-18.454-73.85228.15757.449-101.935-1.417-166.512-234.48-23.742-222.699-135.732-102.238-124.93-134.832-43.737-87.944-109.075-139.592-100.437-83.143-84.815-89.028-52.697-110.841-6.976-10.876120.37-20.83150.71594.2437.613-15.25657.695NA
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment ▄▃▄▅▅▅▄▅▃▆▆▆▂▁▄▂█▃▃▅▃▂▅▅▆▃▇▅▅▂▁▄▃▂▂▁▂▃▁▂▄▂▅▄1.1150.8111.061.4941.4331.4291.0991.4950.8021.7571.5841.7840.4950.3091.0480.6282.2730.7450.8161.3840.8920.4681.3961.2721.6160.8491.8591.5011.2620.4570.2341.1990.7480.6520.40.2170.6430.9190.2430.5081.1670.6131.5271.079NA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:NetCashProvidedByUsedInFinancingActivities ▅▇▂▁█▅▃▅▄▃▅▄▄▃▃▄▄▅▆▄▅▅▄▄▅▄▄▅▄▅▃▄▄▃▄▃▄▃▄▄▃▃▄▃128.963371.27-235.096-294.801493.932175.458-41.697187.66361.33-92.829117.822-7.52172.234-70.251-85.54259.20.763101.424224.39825.517177.693132.33687.34557.276150.74739.60434.048107.98363.119155.019-61.58849.61544.569-38.34496.087-85.2821.29-20.47713.40113.189-50.39-19.5121.454-56.2NA
us-gaap:RepaymentsOfLongTermDebt ▁▁▆▁▂▁█▁▁▁▁▁0.3130.39925.395-1.0722.1760.68834.7850.6280.5230.00.120.628NANANANANANANANANANANANANANANANANANANANANA10.5666.5680.5560.5187.4460.4440.440.4070.3910.06210.479NA
us-gaap:PaymentsOfDividendsCommonStock ██████▆▆▆▆▆▆▆▅▅▄▄▄▄▃▃▃▃▃▃▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁10.98810.97510.97710.9610.96111.0519.5629.2399.2429.3179.4248.7248.7227.6697.676.9726.9676.966.966.6136.616.6016.6016.2786.2515.3575.3455.0485.0524.7584.7584.4614.4584.464.464.3414.3364.224.2164.2134.2084.1934.1784.173NA
us-gaap:PaymentsForRepurchaseOfCommonStock NANA0.00.00.012.5590.03.12.83512.28711.5990.00.00.657-0.688-0.0010.4950.194-0.115-0.0010.1160.00.0710.00.0320.079NANANANA0.0020.0NANA0.001-0.001NANA0.0350.003NANANA0.0NA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value1031031031031031031039090909090909090909090909090909090909077777777777777777777767574747474
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.11.11.21.11.11.21.21.21.21.21.21.31.31.31.31.31.31.31.31.31.41.41.41.51.51.51.61.61.61.71.71.71.71.71.71.81.71.81.81.81.81.8

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302010-09-302010-06-30
Value393939393934343435353434343434343434343129292929292929282828272727
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302010-09-302010-06-30
Value393939393934343434343434343434343434343129292929292929282828272727
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:RestrictedStock


Antidilutive
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-30
Value25.0165000.019449.021333.041.0254.05183.068314.0113450.089974.090298.092577.0126330.079544.0146700.0145000.081840.0118990.0122850.082901.081785.042079.036984.052705.051136.055296.048717.066422.030783.064978.075015.0
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value0.730.810.620.43-0.850.340.620.790.760.670.770.890.620.750.270.650.660.520.510.590.490.460.50.540.520.410.490.490.490.470.40.410.470.410.330.430.30.120.330.440.480.170.310.390.28
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value0.720.810.620.43-0.850.340.620.790.760.660.770.880.610.750.270.650.650.520.510.590.490.460.50.540.520.410.490.490.490.470.40.410.470.410.320.430.30.120.330.440.480.170.310.390.28
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Tier One Risk Based Capital To Risk Weighted Assets

us-gaap:TierOneRiskBasedCapitalToRiskWeightedAssets us-gaap:CreditFacility

us-gaap:TierOneRiskBasedCapitalToRiskWeightedAssets

stba:SAndTBank


Tier
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value11.550.11560.11230.10290.09710.09550.10760.11360.10880.1055
Percentage of TierOneRiskBasedCapitalToRiskWeightedAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

stba:SavingsAndTrust


Tier
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value11.740.11840.11720.11060.10390.10150.12340.12370.11980.1163
Percentage of TierOneRiskBasedCapitalToRiskWeightedAssets101.6102.4104.4107.5107.0106.3114.7108.9110.1110.2

Capital To Risk Weighted Assets

us-gaap:CapitalToRiskWeightedAssets us-gaap:CreditFacility

us-gaap:CapitalToRiskWeightedAssets

stba:SAndTBank


Capital
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value13.140.12810.11230.11760.11150.110.12680.13350.14350.1411
Percentage of CapitalToRiskWeightedAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

stba:SavingsAndTrust


Capital
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value13.440.13220.11380.12550.11860.1160.14270.14360.15390.152
Percentage of CapitalToRiskWeightedAssets102.3103.2101.3106.7106.4105.5112.5107.6107.2107.7

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:AwardType, us-gaap:PlanName

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:RestrictedStock, stba:A2014StockPlanModified


Allocated
Period End2020-10-02
Value-300000.0
Percentage of AllocatedShareBasedCompensationExpense100.0
Percentage of InterestAndDividendIncomeOperating0.0
Percentage of InterestAndDividendIncomeOperating us-gaap:RestrictedStock stba:A2014StockPlanModified0.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value30232316-29.5123017293329372820143.4712222199.518192024102214167.83513181720126.651117.413149.2973.5020.06715176.24
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating43.232.131.422.0-36.734.921.736.542.137.048.338.828.621.55.134.434.731.716.134.136.644.420.141.827.937.918.933.346.044.252.433.417.330.619.037.423.68.90.239.041.314.8

Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value35392920-44.865152731312731332532313131242427222224252417181919171516181411159.9834.3351618187.809131613
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating49.452.439.526.1-55.718.333.239.739.134.541.545.835.547.346.547.448.340.740.948.340.440.045.446.746.939.944.648.249.146.041.142.646.838.530.639.225.411.141.345.345.418.530.935.529.2

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value6.9717.2765.7023.323-11.7932.7675.0914.7435.074.2224.9522.8764.016.007228.8838.6046.6956.517.3675.4965.9316.8146.4076.4984.683.9634.9064.8753.7714.0984.2073.9512.2222.42.6231.3830.8554.3764.6814.0511.5143.3523.63.888
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating9.79.77.54.3-14.73.26.25.96.45.46.53.95.68.832.813.313.310.911.012.79.810.812.811.912.410.79.612.112.29.810.610.910.25.96.26.83.52.210.911.59.73.67.67.98.5

Income Taxes Paid Net

us-gaap:IncomeTaxesPaidNet

us-gaap:IncomeTaxesPaidNet


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value110.1970.0216.00.00.213.4856.6213.1251.4320.04.625100.108127.697130.1728.7694.5111.7947.56.47.7751.55.1754.58.40.05.02.9755.2-0.0452.669
Percentage of IncomeTaxesPaidNet100.0100.0100.0100.00.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating16.60.30.07.80.00.24.28.33.91.80.06.315.40.218.711.520.40.314.87.820.93.314.111.914.83.412.511.121.10.012.97.713.5-0.16.9

Interest And Fee Income Loans And Leases

us-gaap:InterestAndFeeIncomeLoansAndLeases

us-gaap:InterestAndFeeIncomeLoansAndLeases


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value667071727582777574737168666363626056555352514949483937373635353535353636363637383839414242
Percentage of InterestAndFeeIncomeLoansAndLeases100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating93.593.994.294.093.893.793.994.193.993.493.493.293.192.793.493.693.393.093.493.393.193.092.992.493.090.991.391.791.892.292.792.692.892.692.893.093.092.892.993.393.394.094.694.293.6

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value3.2734.1225.627.57210171818181816141311109.2678.3447.2726.6386.3536.1425.3824.4684.0733.83.6573.3153.0763.0173.0743.1253.3073.9574.1744.6295.0255.5515.8196.1926.9767.2457.327.8768.3528.936
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating4.65.57.49.912.820.021.923.323.623.221.919.518.416.314.813.912.911.911.211.011.09.88.47.67.28.38.07.67.68.08.18.610.311.011.912.914.114.915.417.117.317.317.818.419.6

Interest Expense Debt

us-gaap:InterestExpenseDebt

us-gaap:InterestExpenseDebt


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value0.6210.6410.8250.9461.1042.2152.2612.412.7423.2533.7743.4944.0123.2512.82.5192.3681.8931.3491.2341.1131.1280.8570.7980.7490.650.6520.5960.5410.5640.5890.591.0060.9721.0171.0671.0761.0681.0041.2311.2881.258
Percentage of InterestExpenseDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating0.90.91.11.21.42.52.73.03.44.14.94.75.64.84.13.83.63.12.32.12.02.11.61.51.41.51.61.51.41.51.51.52.62.62.62.72.72.72.53.03.13.0

Interest Income Expense Net

us-gaap:InterestIncomeExpenseNet

us-gaap:InterestIncomeExpenseNet


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value687069697070646160605959585657575653525149494849484038373635383534333833333340333434363636
Percentage of InterestIncomeExpenseNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating95.494.592.690.187.280.078.176.776.476.878.180.581.683.785.286.187.188.188.889.089.090.291.692.492.891.792.092.492.492.0100.091.489.789.0100.087.185.985.1100.082.982.782.782.281.680.4

Interest Paid Net

us-gaap:InterestPaidNet

us-gaap:InterestPaidNet


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value3.7465.3686.9167.716111718181919151411118.909
Percentage of InterestPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating5.27.29.210.014.820.322.123.124.624.219.819.416.417.413.1

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value28312416-33.0721322262622263021269.294222218172017161718181214141414111214129.524128.63.481213146.29510129.404
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating39.642.732.021.7-41.115.127.033.732.829.235.141.929.938.513.734.135.129.729.935.630.529.232.734.734.629.235.036.136.936.330.631.736.632.624.532.421.88.930.433.835.714.923.327.520.6

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value28312416-33.0721322262622263021269.294222218172017161718181214141414111214129.525128.63.481213146.2951012
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating39.642.732.021.7-41.115.127.033.732.829.235.141.929.938.513.734.135.129.729.935.630.529.232.734.734.629.235.036.136.936.330.631.736.632.624.532.421.88.930.433.835.714.923.327.5
Percentage of InterestAndDividendIncomeOperating us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss Available To Common Stockholders Basic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value28312416-33.0721322262622263021269.294222218172016161718181214141413111214129.524128.63.489.31712134.748.737107.855
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating39.442.531.921.7-41.115.127.033.732.729.135.141.829.938.313.733.934.929.629.935.530.429.232.734.634.429.135.036.036.836.230.631.736.532.524.532.421.88.923.130.032.011.219.824.117.2

Net Income Loss Available To Common Stockholders Diluted

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value283116-33.07213262622302126222218172017161718181214141414111214129.525128.63.48
Percentage of NetIncomeLossAvailableToCommonStockholdersDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating39.642.721.7-41.115.133.732.829.241.929.938.534.135.129.729.935.630.529.232.734.734.629.235.036.136.936.330.631.736.632.624.532.421.88.9

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

stba:WealthManagement


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
Value3.1672.9442.4862.5222.5862.3622.4132.1012.0622.0482.3022.4832.6162.6822.5212.4062.428
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating4.43.93.33.33.22.72.92.62.62.63.03.43.73.93.73.63.7
Percentage of InterestAndDividendIncomeOperating stba:WealthManagement0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CreditAndDebitCard


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
Value1.7344.1623.8294.1713.6123.4823.4543.4753.5012.9743.1923.1413.3093.0373.0773.0673.042
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax54.8141.4154.0165.4139.7147.4143.1165.4169.8145.2138.7126.5126.5113.2122.1127.5125.3
Percentage of InterestAndDividendIncomeOperating2.45.65.15.44.54.04.24.44.43.84.24.34.64.54.54.64.7
Percentage of InterestAndDividendIncomeOperating us-gaap:CreditAndDebitCard0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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
Value3.6423.4742.9842.822.3423.5583.5393.4123.2123.1533.3313.3513.2273.2413.243.2072.997
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax115.0118.0120.0111.890.6150.6146.7162.4155.8154.0144.7135.0123.4120.8128.5133.3123.4
Percentage of InterestAndDividendIncomeOperating5.14.63.93.72.94.14.34.34.04.04.34.64.54.84.84.84.6
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:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService, us-gaap:TimingOfTransferOfGoodOrService

stba:WealthManagement, us-gaap:TransferredAtPointInTime


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.5110.531.9342.0180.4650.3981.6530.4130.7060.6691.8230.803
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax20.621.074.885.419.318.980.220.230.726.969.729.9
Percentage of InterestAndDividendIncomeOperating0.70.72.42.30.60.52.10.50.90.92.51.2
Percentage of InterestAndDividendIncomeOperating stba:WealthManagement us-gaap:TransferredAtPointInTime0.00.00.00.00.00.00.00.00.00.00.00.0

stba:WealthManagement, us-gaap:TransferredOverTime


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1.9751.9920.6520.3451.9481.7030.4091.6351.5961.8150.7931.879
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax79.479.025.214.680.781.119.879.869.373.130.370.1
Percentage of InterestAndDividendIncomeOperating2.62.60.80.42.42.10.52.12.12.51.12.8
Percentage of InterestAndDividendIncomeOperating stba:WealthManagement us-gaap:TransferredOverTime0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CreditAndDebitCard, us-gaap:TransferredAtPointInTime


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3.6473.9933.4283.2873.2733.2953.3242.7893.0312.9833.1582.849
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax146.7158.3132.6139.2135.6156.8161.2136.2131.7120.1120.7106.2
Percentage of InterestAndDividendIncomeOperating4.85.24.33.84.04.14.23.54.04.14.44.2
Percentage of InterestAndDividendIncomeOperating us-gaap:CreditAndDebitCard us-gaap:TransferredAtPointInTime0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CreditAndDebitCard, us-gaap:TransferredOverTime


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.1820.1780.1840.1940.1810.180.1770.1850.160.1580.1510.188
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.37.17.18.27.58.68.69.07.06.45.87.0
Percentage of InterestAndDividendIncomeOperating0.20.20.20.20.20.20.20.20.20.20.20.3
Percentage of InterestAndDividendIncomeOperating us-gaap:CreditAndDebitCard us-gaap:TransferredOverTime0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DepositAccount, us-gaap:TransferredAtPointInTime


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2.5342.3971.9023.0743.0612.9392.7612.6962.6043.0392.7742.708
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax101.995.073.5130.1126.9139.9133.9131.6113.1122.4106.0101.0
Percentage of InterestAndDividendIncomeOperating3.43.12.43.53.73.73.53.43.44.13.94.0
Percentage of InterestAndDividendIncomeOperating us-gaap:DepositAccount us-gaap:TransferredAtPointInTime0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DepositAccount, us-gaap:TransferredOverTime


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.450.4230.440.4840.4780.4730.4510.4570.7280.3120.4530.533
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax18.116.817.020.519.822.521.922.331.612.617.319.9
Percentage of InterestAndDividendIncomeOperating0.60.60.50.60.60.60.60.61.00.40.60.8
Percentage of InterestAndDividendIncomeOperating us-gaap:DepositAccount us-gaap:TransferredOverTime0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ProductAndServiceOther, us-gaap:TransferredAtPointInTime


Revenue
Period End2020-12-312020-09-302019-12-312019-09-30
Value0.9510.9780.9080.864
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax38.338.837.641.1
Percentage of InterestAndDividendIncomeOperating1.31.31.11.1
Percentage of InterestAndDividendIncomeOperating us-gaap:ProductAndServiceOther us-gaap:TransferredAtPointInTime0.00.00.00.0

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value949593288967919094749005876475717334722972527105709770057060717070867065694367186674647963186215613359714964490647884706453345884528447945264422434743304119409140584114
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidatedEntities

srt:ParentCompany


Assetsus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-31
Value11941232958905
Percentage of Assets13.314.113.212.8
Percentage of Assets13.314.113.212.8
Percentage of Assets srt:ParentCompany100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities

us-gaap:Liabilities


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value830781607813804883387829757265896369628663166185619061096176628262156209610158795849566855265427536252094356430041904123396140323981393539893888383638263629348834653535
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets87.587.587.187.688.086.986.487.086.887.087.187.187.287.287.587.687.787.987.987.587.687.587.587.387.487.287.787.787.587.687.487.987.987.888.187.988.388.488.185.285.485.9

us-gaap:Liabilities us-gaap:ConsolidatedEntities

srt:ParentCompany


Liabilitiesus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-31
Value39402221
Percentage of Liabilities0.50.50.40.3
Percentage of Assets0.40.50.30.3
Percentage of Assets srt:ParentCompany3.33.32.32.4

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value949593288967919094749005876475717334722972527105709770057060717070867065694367186674647963186215613359714964490647884706453345884528447945264422434743304119409140584114
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilitiesAndStockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Liabilities
Period End2020-12-312019-12-312018-12-312017-12-31
Value11941232958905
Percentage of LiabilitiesAndStockholdersEquity13.314.113.212.8
Percentage of Assets13.314.113.212.8
Percentage of Assets srt:ParentCompany100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value1188116811541142113511761191982964943935919907895884887871855841838825810792787771762608605597583571555546544537534510504490603592578
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets12.512.512.912.412.013.113.613.013.213.012.912.912.812.812.512.412.312.112.112.512.412.512.512.712.612.812.312.312.512.412.612.112.112.211.912.111.711.611.914.814.614.1

us-gaap:StockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Stockholders
Period End2020-12-312019-12-312018-12-312017-12-31
Value11541191935884
Percentage of StockholdersEquity100.0100.0100.0100.0
Percentage of Assets12.913.612.912.5
Percentage of Assets srt:ParentCompany96.796.797.797.6

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312010-12-31
Value3.6051.0618.9719.4539.2325.672-11.67-7.313-9.519-16.931-23.107-33.253-30.945-29.953-18.427-12.604-12.858-12.596-13.784-5.643-4.748-8.116-16.457-9.736-13.521-10.028-13.833-7.172-6.026-9.648-12.694-21.168-21.795-14.343-13.582-11.47-13.389-14.108-6.334
Percentage of StockholdersEquity0.30.10.80.80.80.5-1.0-0.7-1.0-1.8-2.5-3.6-3.4-3.3-2.1-1.4-1.5-1.5-1.6-0.7-0.6-1.0-2.1-1.2-1.8-1.3-2.3-1.2-1.0-1.7-2.2-3.8-4.0-2.6-2.5-2.1-2.6-2.9-1.1
Percentage of Assets0.00.00.10.10.10.1-0.1-0.1-0.1-0.2-0.3-0.5-0.4-0.4-0.3-0.2-0.2-0.2-0.2-0.1-0.1-0.1-0.3-0.2-0.2-0.2-0.3-0.1-0.1-0.2-0.3-0.5-0.5-0.3-0.3-0.3-0.3-0.3-0.2
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312010-12-31
Value40240140040040040039921221121021020921621621621521421421321221121121021020920978787878787777777777655251
Percentage of StockholdersEquity33.834.434.735.135.334.033.621.621.922.422.522.823.924.224.424.324.725.025.325.325.726.126.626.727.227.413.013.013.213.413.714.014.214.214.414.512.910.78.9
Percentage of Assets4.24.34.54.44.24.44.62.82.92.92.93.03.13.13.13.03.03.03.13.23.23.33.33.43.43.51.61.61.61.71.71.71.71.71.71.71.51.31.3
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312010-12-31
Value1031031031031031031039090909090909090909090909090909090909077777777777777777777767474
Percentage of StockholdersEquity8.78.99.09.19.18.88.79.29.49.69.79.810.010.110.210.210.410.610.710.810.911.111.411.511.711.812.812.913.113.413.714.014.314.314.514.614.915.112.8
Percentage of Assets1.11.11.21.11.11.21.21.21.21.21.21.31.31.31.31.31.31.31.31.31.41.41.41.51.51.51.61.61.61.71.71.71.71.71.71.81.71.81.8
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312010-12-31
Value746731710698692740761748730716701684662649628626610595585575561551544533521509504494485477468461453444436430422421401
Percentage of StockholdersEquity62.862.661.561.160.963.063.876.275.775.975.074.473.072.671.170.670.169.669.668.668.068.068.767.767.666.982.981.781.381.981.983.082.981.581.180.782.885.969.4
Percentage of Assets7.97.87.97.67.38.28.79.910.09.99.79.69.39.38.98.78.68.48.48.68.48.58.68.68.58.510.210.110.110.210.310.010.09.99.69.79.710.29.8
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312010-12-31
Value-67.02-69.477-68.612-70.101-69.735-74.157-60.982-60.886-57.756-57.266-43.622-31.338-31.245-31.509-32.081-31.88-31.851-31.755-33.575-33.575-33.484-33.914-36.405-36.37-36.341-36.765-38.649-38.649-38.627-40.809-40.291-40.276-40.276-40.692-40.486-40.447-40.582-43.756-48.727
Percentage of StockholdersEquity-5.6-5.9-5.9-6.1-6.1-6.3-5.1-6.2-6.0-6.1-4.7-3.4-3.4-3.5-3.6-3.6-3.7-3.7-4.0-4.0-4.1-4.2-4.6-4.6-4.7-4.8-6.4-6.4-6.5-7.0-7.1-7.3-7.4-7.5-7.5-7.6-7.9-8.9-8.4
Percentage of Assets-0.7-0.7-0.8-0.8-0.7-0.8-0.7-0.8-0.8-0.8-0.6-0.4-0.4-0.4-0.5-0.4-0.4-0.4-0.5-0.5-0.5-0.5-0.6-0.6-0.6-0.6-0.8-0.8-0.8-0.9-0.9-0.9-0.9-0.9-0.9-0.9-0.9-1.1-1.2
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Tier One Risk Based Capital

us-gaap:TierOneRiskBasedCapital us-gaap:CreditFacility

us-gaap:TierOneRiskBasedCapital

stba:SAndTBank


Tier
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value810832659582542502403389343321
Percentage of TierOneRiskBasedCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets9.09.59.18.37.87.98.18.67.67.8
Percentage of Assets stba:SAndTBank0.00.00.00.00.00.00.00.00.00.0

stba:SavingsAndTrust


Tier
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value825854689628582535465426392356
Percentage of TierOneRiskBasedCapital101.8102.6104.6107.9107.4106.6115.2109.4114.3110.9
Percentage of Assets9.29.79.58.98.48.59.49.48.78.7
Percentage of Assets stba:SavingsAndTrust0.00.00.00.00.00.00.00.00.00.0

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-312008-12-31
Value985671229308351187197173122116155132137112117114125104139125941219911514612410914313018510823424726133734740338627026217010810888716969
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.47.22.63.43.72.12.32.31.71.62.11.91.91.61.71.61.81.52.01.91.41.91.61.92.42.12.22.92.73.92.45.15.55.87.57.89.38.96.66.44.20.02.60.00.00.00.0

us-gaap:CashAndCashEquivalentsAtCarryingValue us-gaap:ConsolidatedEntities

srt:ParentCompany


Cash
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value6.5857.5098.869211712
Percentage of CashAndCashEquivalentsAtCarryingValue2.93.85.718.212.212.7
Percentage of Assets0.10.10.10.30.20.2
Percentage of Assets srt:ParentCompany0.60.60.92.40.00.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value985671229308351187197173122116155132137112117139
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.47.22.63.43.72.12.32.31.71.62.11.91.91.61.72.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents us-gaap:ConsolidatedEntities

srt:ParentCompany


Cash
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value6.5857.5098.8692117
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents2.93.85.718.212.2
Percentage of Assets0.10.10.10.30.2
Percentage of Assets srt:ParentCompany0.60.60.92.40.0

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value565656564141424141404142424545444747484949494938373636363737373839393937383939
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.60.60.60.60.60.60.60.60.60.60.60.60.60.60.60.60.70.70.70.80.80.80.80.80.80.80.80.80.80.80.80.90.90.90.90.90.91.01.0

Investments In Affiliates Subsidiaries Associates And Joint Ventures

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures us-gaap:ConsolidatedEntities

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures

srt:ParentCompany


Investments
Period End2020-12-312019-12-312018-12-312017-12-31
Value11681198925857
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures100.0100.0100.0100.0
Percentage of Assets13.013.712.812.1
Percentage of Assets srt:ParentCompany97.897.396.694.7

Goodwill

us-gaap:Goodwill

us-gaap:Goodwill


Goodwill
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value373373373373373374371287287287287287287287291291291291291291291291291291291290175175175175175175175175175175171171165165165165
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.94.04.24.13.94.24.23.83.94.04.04.04.14.14.14.14.14.14.24.34.44.54.64.74.74.93.53.63.73.73.93.83.93.93.94.03.94.04.04.04.14.0

us-gaap:Goodwill us-gaap:BusinessAcquisition

stba:DNBFinancialCorporation


Goodwillus-gaap:
Period End2020-12-312020-11-302020-09-302020-06-302020-03-312019-12-312019-11-30
Value86858685868484
Percentage of Goodwill23.00.023.023.023.022.70.0
Percentage of Assets1.00.00.90.91.01.00.0
Percentage of Assets stba:DNBFinancialCorporation0.00.00.00.00.00.00.0

Intangible Assets Net Excluding Goodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill


Intangible
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value7.7718.2118.6759.2659.74310102.0922.2552.4182.6012.7252.9093.1263.6773.9564.1914.5524.915.2825.6576.0676.5257.07.4797.9962.6312.8863.1463.4433.7594.1284.5064.9195.355.7835.7696.2025.7286.1426.5567.465
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.10.10.10.10.00.00.00.00.00.00.00.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.20.20.2

Finite Lived Intangible Assets Net

us-gaap:FiniteLivedIntangibleAssetsNet

us-gaap:FiniteLivedIntangibleAssetsNet


Finite
Period End2020-12-31
Value8675000.0
Percentage of FiniteLivedIntangibleAssetsNet100.0
Percentage of Assets0.1

Deferred Tax Assets Liabilities Net

us-gaap:DeferredTaxAssetsLiabilitiesNet

us-gaap:DeferredTaxAssetsLiabilitiesNet


Deferred
Period End2020-12-312020-01-012019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value1813131720323428292723
Percentage of DeferredTaxAssetsLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.00.20.20.30.50.50.60.70.60.6

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
Value4647373635
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0
Percentage of Assets0.50.50.50.50.5

Equity Securities Fv Ni

us-gaap:EquitySecuritiesFvNi

us-gaap:EquitySecuritiesFvNi


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value1096000.03416000.03300000.03249000.02663000.03566000.05150000.04706000.04551000.04498000.04816000.05314000.05425000.05144000.0
Percentage of EquitySecuritiesFvNi100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.10.10.10.10.10.10.10.1

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

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value1015000.03328000.03228000.03185000.02602000.03504000.05078000.00000000
Percentage of EquitySecuritiesFvNi92.697.497.898.097.798.398.60.00.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.00.10.00.00.00.00.00.00.0
Percentage of Assets us-gaap:FairValueInputsLevel1 us-gaap:FairValueMeasurementsRecurring0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value81000.088000.072000.064000.061000.062000.072000.04706000.04551000.04498000.04816000.05314000.05425000.05144000.0
Percentage of EquitySecuritiesFvNi7.42.62.22.02.31.71.4100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.10.10.10.10.10.10.1
Percentage of Assets us-gaap:FairValueInputsLevel2 us-gaap:FairValueMeasurementsRecurring0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value1096000.03416000.03300000.03249000.02663000.03566000.05150000.04706000.04551000.04498000.04816000.05314000.05425000.05144000.0
Percentage of EquitySecuritiesFvNi100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.10.10.10.10.10.10.10.1
Percentage of Assets us-gaap:FairValueMeasurementsRecurring0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Other Assets

us-gaap:OtherAssets

us-gaap:OtherAssets


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value236228304336334310159117134128881021019595102989710210110410110210210610297939499103105109119120128128130124119117115
Percentage of OtherAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.52.43.43.73.53.41.81.61.81.81.21.41.41.41.41.41.41.41.51.51.61.61.61.61.71.72.01.92.02.12.32.32.42.72.72.93.03.03.02.92.92.8

us-gaap:OtherAssets us-gaap:ConsolidatedEntities

srt:ParentCompany


Other
Period End2020-12-312019-12-312018-12-312017-12-31
Value8.6149.7418.4587.272
Percentage of OtherAssets2.86.19.57.6
Percentage of Assets0.10.10.10.1
Percentage of Assets srt:ParentCompany0.70.80.90.8

Time Deposit Maturities Year One

us-gaap:TimeDepositMaturitiesYearOne

us-gaap:TimeDepositMaturitiesYearOne


Time
Period End2020-12-31
Value1182
Percentage of TimeDepositMaturitiesYearOne100.0
Percentage of Assets13.2

Long Term Debt

us-gaap:LongTermDebt

us-gaap:LongTermDebt


Long
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value113113114115114115116115919192925859596060611621621631636965656666676868233440353131323229
Percentage of LongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.21.21.31.31.51.61.61.61.31.31.31.30.80.80.80.90.90.92.52.62.62.71.21.31.31.41.41.51.51.50.50.80.90.80.70.80.80.80.7

us-gaap:LongTermDebt us-gaap:ConsolidatedEntities

srt:ParentCompany


Long
Period End2020-12-312019-12-312018-12-312017-12-31
Value39392020
Percentage of LongTermDebt0.034.117.822.2
Percentage of Assets0.40.40.30.3
Percentage of Assets srt:ParentCompany3.33.22.22.3

us-gaap:LongTermDebt us-gaap:DebtInstrument

us-gaap:JuniorSubordinatedDebt


Long
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value646464644545454545454545454545454545454545504545452121454590
Percentage of LongTermDebt56.656.456.155.839.739.539.339.350.149.849.449.177.176.475.674.974.228.128.027.927.872.970.169.568.931.832.367.166.5265.7
Percentage of Assets0.70.70.70.70.60.60.60.60.60.60.70.60.60.60.70.70.70.70.70.70.70.80.90.91.00.50.51.01.02.0
Percentage of Assets us-gaap:JuniorSubordinatedDebt0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:LongTermDebt


Long
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value494950506969707045464647
Percentage of LongTermDebt43.443.643.944.260.360.560.760.749.950.250.650.9
Percentage of Assets0.50.50.60.60.91.01.01.00.60.60.70.7
Percentage of Assets us-gaap:LongTermDebt0.00.00.00.00.00.00.00.00.00.00.00.0

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2020-12-31
Value4855000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0
Percentage of Assets0.1

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2020-12-31
Value4759000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0
Percentage of Assets0.1

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour


Lessee
Period End2020-12-31
Value4752000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0
Percentage of Assets0.1

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2020-12-31
Value4787000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0
Percentage of Assets0.1

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive


Lessee
Period End2020-12-31
Value66
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0
Percentage of Assets0.7

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value5152424140
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0
Percentage of Assets0.60.60.60.60.6

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2020-12-31
Value90
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0
Percentage of Assets1.0

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2020-12-31
Value38
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0
Percentage of Assets0.4

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value1188116811541142113511761191982964943935919907895884887871855841838825810792787771762608605597583571555546544537534510504490603592578
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets12.512.512.912.412.013.113.613.013.213.012.912.912.812.812.512.412.312.112.112.512.412.512.512.712.612.812.312.312.512.412.612.112.112.211.912.111.711.611.914.814.614.1

us-gaap:StockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Stockholders
Period End2020-12-312019-12-312018-12-312017-12-31
Value11541191935884
Percentage of StockholdersEquity100.0100.0100.0100.0
Percentage of Assets12.913.612.912.5
Percentage of Assets srt:ParentCompany96.796.797.797.6

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312010-12-31
Value3.6051.0618.9719.4539.2325.672-11.67-7.313-9.519-16.931-23.107-33.253-30.945-29.953-18.427-12.604-12.858-12.596-13.784-5.643-4.748-8.116-16.457-9.736-13.521-10.028-13.833-7.172-6.026-9.648-12.694-21.168-21.795-14.343-13.582-11.47-13.389-14.108-6.334
Percentage of StockholdersEquity0.30.10.80.80.80.5-1.0-0.7-1.0-1.8-2.5-3.6-3.4-3.3-2.1-1.4-1.5-1.5-1.6-0.7-0.6-1.0-2.1-1.2-1.8-1.3-2.3-1.2-1.0-1.7-2.2-3.8-4.0-2.6-2.5-2.1-2.6-2.9-1.1
Percentage of Assets0.00.00.10.10.10.1-0.1-0.1-0.1-0.2-0.3-0.5-0.4-0.4-0.3-0.2-0.2-0.2-0.2-0.1-0.1-0.1-0.3-0.2-0.2-0.2-0.3-0.1-0.1-0.2-0.3-0.5-0.5-0.3-0.3-0.3-0.3-0.3-0.2
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312010-12-31
Value40240140040040040039921221121021020921621621621521421421321221121121021020920978787878787777777777655251
Percentage of StockholdersEquity33.834.434.735.135.334.033.621.621.922.422.522.823.924.224.424.324.725.025.325.325.726.126.626.727.227.413.013.013.213.413.714.014.214.214.414.512.910.78.9
Percentage of Assets4.24.34.54.44.24.44.62.82.92.92.93.03.13.13.13.03.03.03.13.23.23.33.33.43.43.51.61.61.61.71.71.71.71.71.71.71.51.31.3
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312010-12-31
Value1031031031031031031039090909090909090909090909090909090909077777777777777777777767474
Percentage of StockholdersEquity8.78.99.09.19.18.88.79.29.49.69.79.810.010.110.210.210.410.610.710.810.911.111.411.511.711.812.812.913.113.413.714.014.314.314.514.614.915.112.8
Percentage of Assets1.11.11.21.11.11.21.21.21.21.21.21.31.31.31.31.31.31.31.31.31.41.41.41.51.51.51.61.61.61.71.71.71.71.71.71.81.71.81.8
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312010-12-31
Value746731710698692740761748730716701684662649628626610595585575561551544533521509504494485477468461453444436430422421401
Percentage of StockholdersEquity62.862.661.561.160.963.063.876.275.775.975.074.473.072.671.170.670.169.669.668.668.068.068.767.767.666.982.981.781.381.981.983.082.981.581.180.782.885.969.4
Percentage of Assets7.97.87.97.67.38.28.79.910.09.99.79.69.39.38.98.78.68.48.48.68.48.58.68.68.58.510.210.110.110.210.310.010.09.99.69.79.710.29.8
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312010-12-31
Value-67.02-69.477-68.612-70.101-69.735-74.157-60.982-60.886-57.756-57.266-43.622-31.338-31.245-31.509-32.081-31.88-31.851-31.755-33.575-33.575-33.484-33.914-36.405-36.37-36.341-36.765-38.649-38.649-38.627-40.809-40.291-40.276-40.276-40.692-40.486-40.447-40.582-43.756-48.727
Percentage of StockholdersEquity-5.6-5.9-5.9-6.1-6.1-6.3-5.1-6.2-6.0-6.1-4.7-3.4-3.4-3.5-3.6-3.6-3.7-3.7-4.0-4.0-4.1-4.2-4.6-4.6-4.7-4.8-6.4-6.4-6.5-7.0-7.1-7.3-7.4-7.5-7.5-7.6-7.9-8.9-8.4
Percentage of Assets-0.7-0.7-0.8-0.8-0.7-0.8-0.7-0.8-0.8-0.8-0.6-0.4-0.4-0.4-0.5-0.4-0.4-0.4-0.5-0.5-0.5-0.5-0.6-0.6-0.6-0.6-0.8-0.8-0.8-0.9-0.9-0.9-0.9-0.9-0.9-0.9-0.9-1.1-1.2
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value1031031031031031031039090909090909090909090909090909090909077777777777777777777767574747474
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.11.11.21.11.11.21.21.21.21.21.21.31.31.31.31.31.31.31.31.31.41.41.41.51.51.51.61.61.61.71.71.71.71.71.71.81.71.81.81.81.81.8

Additional Paid In Capital

us-gaap:AdditionalPaidInCapital

us-gaap:AdditionalPaidInCapital


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value40240140040040040039921221121021020921621621621521421421321221121121021020920978787878787777777777656552525251
Percentage of AdditionalPaidInCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.24.34.54.44.24.44.62.82.92.92.93.03.13.13.13.03.03.03.13.23.23.33.33.43.43.51.61.61.61.71.71.71.71.71.71.71.51.51.31.31.31.3

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value746731710698692740761748730716701684662649628626610595585575561551544533521509504494485477468461453444436430422419421416408401
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets7.97.87.97.67.38.28.79.910.09.99.79.69.39.38.98.78.68.48.48.68.48.58.68.68.58.510.210.110.110.210.310.010.09.99.69.79.79.710.210.210.19.8

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value3605000.01061000.08971000.09453000.09232000.05672000.0-11670000.0-7313000.0-9519000.0-16931000.0-23107000.0-33253000.0-30945000.0-29953000.0-18427000.0-12604000.0-12858000.0-12596000.0-13784000.0-5643000.0-4748000.0-8116000.0-16457000.0-9736000.0-13521000.0-10028000.0-13833000.0-7172000.0-6026000.0-9648000.0-12694000.0-21168000.0-21795000.0-14343000.0-13582000.0-11470000.0-13389000.0-14086000.0-14108000.0-1919000.0-4048000.0-6334000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.10.10.10.1-0.1-0.1-0.1-0.2-0.3-0.5-0.4-0.4-0.3-0.2-0.2-0.2-0.2-0.1-0.1-0.1-0.3-0.2-0.2-0.2-0.3-0.1-0.1-0.2-0.3-0.5-0.5-0.3-0.3-0.3-0.3-0.3-0.3-0.0-0.1-0.2

Treasury Stock Value

us-gaap:TreasuryStockValue

us-gaap:TreasuryStockValue


Treasury
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value676968706974606057574331313132313131333333333636363638383840404040404040404143444548
Percentage of TreasuryStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.70.70.80.80.70.80.70.80.80.80.60.40.40.40.50.40.40.40.50.50.50.50.60.60.60.60.80.80.80.90.90.90.90.90.90.90.91.01.11.11.11.2

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value3790562828-59.96145332830422026373031213024281825-1.055365.931919142122182230145.389362616152718123315
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating52.9120.574.737.235.3-68.555.342.535.738.855.928.137.355.645.446.933.649.641.349.132.846.6-2.067.911.343.947.536.253.757.846.858.879.838.213.893.066.541.438.667.843.429.876.434.2

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value146-19.65299223-358.644-125.63620-170.828-83.71123-137.815-18.454-73.8522857-101.935-1.417-166.512-234.48-23.742-222.699-135.732-102.238-124.93-134.832-43.737-87.944-109.075-139.592-100.437-83.143-84.815-89.028-52.697-110.841-6.976-10.876120-20.83150947.613-15.25657
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating205.4-26.3132.1290.7-445.6-143.424.6-214.0-105.130.2-179.9-25.1-103.241.484.7-152.8-2.2-272.3-396.8-41.1-398.7-246.7-191.6-232.8-256.3-99.6-212.5-268.6-350.1-259.8-214.4-219.8-230.9-139.3-284.8-18.0-27.6307.5-51.7124.2225.618.0-34.5127.3

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value128371-235.096-294.801493175-41.69718761-92.829117-7.52172-70.251-85.542590.763101224251771328757150393410763155-61.5884944-38.34496-85.2821.29-20.4771313-50.39-19.5121.454-56.2
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating180.2496.5-311.2-383.6613.7200.3-50.6235.177.0-118.1153.8-10.2100.9-103.3-126.188.71.2165.9379.744.1318.2240.5163.7106.7286.590.282.3265.9158.3400.9-158.8128.6115.6-101.3246.9-219.73.3-52.333.332.3-120.6-46.23.3-124.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value313441-78.823-42.876163-10.13924506.056-38.66922-5.28325-4.303
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating438.5590.7-104.3-55.8203.4-11.629.463.67.6-49.229.8-7.235.0-6.3

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value3790562828-59.96145332830422026373031213024281825-1.055365.931919142122182230145.389362616152718123315
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating52.9120.574.737.235.3-68.555.342.535.738.855.928.137.355.645.446.933.649.641.349.132.846.6-2.067.911.343.947.536.253.757.846.858.879.838.213.893.066.541.438.667.843.429.876.434.2

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value28312416-33.0721322262622263021269.294222218172017161718181214141414111214129.524128.63.481213146.29510129.404
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating39.642.732.021.7-41.115.127.033.732.829.235.141.929.938.513.734.135.129.729.935.630.529.232.734.734.629.235.036.136.936.330.631.736.632.624.532.421.88.930.433.835.714.923.327.520.6

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value28312416-33.0721322262622263021269.294222218172017161718181214141414111214129.525128.63.481213146.2951012
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating39.642.732.021.7-41.115.127.033.732.829.235.141.929.938.513.734.135.129.729.935.630.529.232.734.734.629.235.036.136.936.330.631.736.632.624.532.421.88.930.433.835.714.923.327.5
Percentage of InterestAndDividendIncomeOperating us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Share Based Compensation

us-gaap:ShareBasedCompensation

us-gaap:ShareBasedCompensation


Share
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-121000.0372000.030000.0443000.0621000.0840000.0376000.0604000.0660000.0452000.0267000.0512000.0655000.0510000.0841000.01002000.0682000.0583000.0548000.0731000.0478000.0389000.0529000.0240000.0381000.0199000.0260000.0135000.0179000.0254000.0137000.0117000.0230000.0205000.0370000.0108000.0324000.0253000.0202000.0181000.0286000.064000.0
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value146-19.65299223-358.644-125.63620-170.828-83.71123-137.815-18.454-73.8522857-101.935-1.417-166.512-234.48-23.742-222.699-135.732-102.238-124.93-134.832-43.737-87.944-109.075-139.592-100.437-83.143-84.815-89.028-52.697-110.841-6.976-10.876120-20.83150947.613-15.25657
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating205.4-26.3132.1290.7-445.6-143.424.6-214.0-105.130.2-179.9-25.1-103.241.484.7-152.8-2.2-272.3-396.8-41.1-398.7-246.7-191.6-232.8-256.3-99.6-212.5-268.6-350.1-259.8-214.4-219.8-230.9-139.3-284.8-18.0-27.6307.5-51.7124.2225.618.0-34.5127.3

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value1115000.0811000.01060000.01494000.01433000.01429000.01099000.01495000.0802000.01757000.01584000.01784000.0495000.0309000.01048000.0628000.02273000.0745000.0816000.01384000.0892000.0468000.01396000.01272000.01616000.0849000.01859000.01501000.01262000.0457000.0234000.01199000.0748000.0652000.0400000.0217000.0643000.0919000.0243000.0508000.01167000.0613000.01527000.01079000.0
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value128371-235.096-294.801493175-41.69718761-92.829117-7.52172-70.251-85.542590.763101224251771328757150393410763155-61.5884944-38.34496-85.2821.29-20.4771313-50.39-19.5121.454-56.2
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating180.2496.5-311.2-383.6613.7200.3-50.6235.177.0-118.1153.8-10.2100.9-103.3-126.188.71.2165.9379.744.1318.2240.5163.7106.7286.590.282.3265.9158.3400.9-158.8128.6115.6-101.3246.9-219.73.3-52.333.332.3-120.6-46.23.3-124.0

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt

us-gaap:RepaymentsOfLongTermDebt


Repayments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value0.3130.39925-1.0722.1760.688340.6280.5230.00.120.628106.5680.5560.5187.4460.4440.440.4070.3910.06210
Percentage of RepaymentsOfLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments Of Dividends Common Stock

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:PaymentsOfDividendsCommonStock


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value1010101010119.5629.2399.2429.3179.4248.7248.7227.6697.676.9726.9676.966.966.6136.616.6016.6016.2786.2515.3575.3455.0485.0524.7584.7584.4614.4584.464.464.3414.3364.224.2164.2134.2084.1934.1784.173
Percentage of PaymentsOfDividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock


Payments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312013-12-312013-09-302012-12-312012-09-302011-12-312011-09-302010-09-30
Value0.00.00.0120.03.12.83512110.00.00.657-0.688-0.0010.4950.194-0.115-0.0010.1160.00.0710.00.0320.0790.0020.00.001-0.0010.0350.0030.0
Percentage of PaymentsForRepurchaseOfCommonStock0.00.00.0100.00.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.0100.0100.0100.00.0100.0100.0100.0100.00.0

Deferred Tax Assets Net

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsNet


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value51382827444641374240
Percentage of DeferredTaxAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits

us-gaap:UnrecognizedTaxBenefits


Unrecognized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value1277000.01051000.0768000.0909000.0804000.01102000.0284000.01902000.0978000.0200000.0242000.0286000.0
Percentage of UnrecognizedTaxBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:DeferredTaxAssetsValuationAllowance


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value5489000.05134000.04573000.03598000.03114000.02670000.02249000.02199000.01498000.01232000.0
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsValuationAllowance us-gaap:IncomeTaxAuthorityName

stpr:PA


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value5500000.05100000.04600000.03600000.03100000.02700000.02200000.0
Percentage of DeferredTaxAssetsValuationAllowance100.299.3100.6100.199.6101.197.8

stba:BookValue

stba:BookValue


Book
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value29.3829.128.9330.0630.1328.6928.1127.4726.9826.2725.9125.5825.2825.3724.924.4524.1224.0223.6323.2322.7622.6322.1521.9120.4220.3320.0419.6419.2118.6818.3918.3218.0817.9717.6517.4717.4417.6817.3116.9
Percentage of BookValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

stba:BusinessCombinationAcquisitionRelatedCostsOther us-gaap:BusinessAcquisition

stba:BusinessCombinationAcquisitionRelatedCostsOther

stba:DNBFinancialCorporation


Business
Period End2020-12-312020-09-302020-06-302020-03-31
Value000300000.0
Percentage of BusinessCombinationAcquisitionRelatedCostsOther0.00.00.0100.0

stba:BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAccruedInterestPayableAndOtherLiabilities us-gaap:BusinessAcquisition

stba:BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAccruedInterestPayableAndOtherLiabilities

stba:DNBFinancialCorporation


Business
Period End2020-11-302020-06-302019-11-30
Value-100000.00-3184000.0
Percentage of BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAccruedInterestPayableAndOtherLiabilities100.00.0100.0

stba:BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAcquiredReceivableFairValue

stba:BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAcquiredReceivableFairValue


Business
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value-6900000.0-7500000.0-8600000.0-9300000.0-10500000.0-10900000.0-12300000.0
Percentage of BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAcquiredReceivableFairValue100.0100.0100.0100.0100.0100.0100.0

stba:BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAcquiredReceivableFairValue us-gaap:BusinessAcquisition

stba:DNBFinancialCorporation


Business
Period End2020-11-302020-09-302020-06-302020-03-312019-11-30
Value-2400000.0-4900000.0100000.02500000.0-8143000.0
Percentage of BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAcquiredReceivableFairValue0.052.7-1.0-22.90.0

stba:BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentDeferredIncomeTaxes us-gaap:BusinessAcquisition

stba:BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentDeferredIncomeTaxes

stba:DNBFinancialCorporation


Business
Period End2020-11-302020-06-302019-11-30
Value300000.00-3298000.0
Percentage of BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentDeferredIncomeTaxes100.00.0100.0

stba:BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentLiabilities us-gaap:BusinessAcquisition

stba:BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentLiabilities

stba:DNBFinancialCorporation


Business
Period End2020-11-302020-06-302019-11-30
Value-379000.012000.0-2458000.0
Percentage of BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentLiabilities100.0100.0100.0

stba:BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentNoncurrentLiabilitiesLongTermDebt us-gaap:BusinessAcquisition

stba:BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentNoncurrentLiabilitiesLongTermDebt

stba:DNBFinancialCorporation


Business
Period End2020-11-302020-06-302019-11-30
Value-300000.00-276000.0
Percentage of BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentNoncurrentLiabilitiesLongTermDebt100.00.0100.0

stba:BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherNoncurrentAssets us-gaap:BusinessAcquisition

stba:BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherNoncurrentAssets

stba:DNBFinancialCorporation


Business
Period End2020-11-302020-06-302019-11-30
Value-100000.034000.0-4278000.0
Percentage of BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherNoncurrentAssets100.0100.0100.0

stba:BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentTangibleAssets us-gaap:BusinessAcquisition

stba:BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentTangibleAssets

stba:DNBFinancialCorporation


Business
Period End2020-11-302020-06-302019-11-30
Value-2182000.0153000.0-16753000.0
Percentage of BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentTangibleAssets100.0100.0100.0

stba:BusinessCombinationProvisionalInformationInitialAccountingIncompleteIdentifiableTangibleAssetsAndLiabilitiesAssumedNet us-gaap:BusinessAcquisition

stba:BusinessCombinationProvisionalInformationInitialAccountingIncompleteIdentifiableTangibleAssetsAndLiabilitiesAssumedNet

stba:DNBFinancialCorporation


Business
Period End2020-11-302020-06-302019-11-30
Value-1803000.0141000.0-14295000.0
Percentage of BusinessCombinationProvisionalInformationInitialAccountingIncompleteIdentifiableTangibleAssetsAndLiabilitiesAssumedNet100.0100.0100.0

stba:DataProcessingContractTerminationAndConversionCostExpenses us-gaap:BusinessAcquisition

stba:DataProcessingContractTerminationAndConversionCostExpenses

stba:DNBFinancialCorporation


Data
Period End2020-12-312020-09-302020-06-302020-03-31
Value000400000.0
Percentage of DataProcessingContractTerminationAndConversionCostExpenses0.00.00.0100.0

stba:FinancialReceivableTroubleDebtRestructuringReclassifiedToAccruingTroubleDebtRestructuringStatus

stba:FinancialReceivableTroubleDebtRestructuringReclassifiedToAccruingTroubleDebtRestructuringStatus


Financial
Period End2020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302014-12-312014-09-302014-06-302013-12-312013-09-30
Value-22.60.10.10.30.20.1-0.10.51.45.01.7
Percentage of FinancialReceivableTroubleDebtRestructuringReclassifiedToAccruingTroubleDebtRestructuringStatus100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

stba:FinancingReceivableAllowanceForCreditLossIncreaseDecreaseForPandemicForecast us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

stba:FinancingReceivableAllowanceForCreditLossIncreaseDecreaseForPandemicForecast

us-gaap:CommercialPortfolioSegment, stba:BusinessBanking


Financing
Period End2020-09-30
Value2000000.0
Percentage of FinancingReceivableAllowanceForCreditLossIncreaseDecreaseForPandemicForecast100.0

stba:FinancingReceivableAllowanceForCreditLossIncreaseDecreaseForRiskComponent us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

stba:FinancingReceivableAllowanceForCreditLossIncreaseDecreaseForRiskComponent

stba:PaycheckProtectionProgramLoanCARESAct


Financing
Period End2020-09-30
Value-200000.0
Percentage of FinancingReceivableAllowanceForCreditLossIncreaseDecreaseForRiskComponent100.0

stba:FinancingReceivableAllowanceForCreditLossQualitativeReservePeriodIncreaseDecrease us-gaap:UnusualOrInfrequentItem

stba:FinancingReceivableAllowanceForCreditLossQualitativeReservePeriodIncreaseDecrease

stba:COVID19


Financing
Period End2021-03-312020-03-31
Value2700000.03100000.0
Percentage of FinancingReceivableAllowanceForCreditLossQualitativeReservePeriodIncreaseDecrease100.0100.0

stba:FinancingReceivableAllowanceForCreditLossWriteoffAfterRecoveryPercent

stba:FinancingReceivableAllowanceForCreditLossWriteoffAfterRecoveryPercent


Financing
Period End2021-03-312020-03-31
Value0.330.63
Percentage of FinancingReceivableAllowanceForCreditLossWriteoffAfterRecoveryPercent100.0100.0

stba:FinancingReceivableAndOffBalanceSheetLiabilityCreditLossExpenseReversal

stba:FinancingReceivableAndOffBalanceSheetLiabilityCreditLossExpenseReversal


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2.5613.1377.131786202.1054.9132.2055.684
Percentage of FinancingReceivableAndOffBalanceSheetLiabilityCreditLossExpenseReversal100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

stba:FinancingReceivableBeforeAllowanceForCreditLossPeriodIncreaseDecrease us-gaap:FinancialInstrumentPerformanceStatus, us-gaap:UnusualOrInfrequentItem

stba:FinancingReceivableBeforeAllowanceForCreditLossPeriodIncreaseDecrease

us-gaap:NonperformingFinancingReceivable, stba:COVID19


Financing
Period End2021-03-31
Value61
Percentage of FinancingReceivableBeforeAllowanceForCreditLossPeriodIncreaseDecrease100.0

stba:FinancingReceivableBeforeAllowanceForCreditLossReclassificationDuringPeriod us-gaap:FinancingReceivablePortfolioSegment

stba:FinancingReceivableBeforeAllowanceForCreditLossReclassificationDuringPeriod

us-gaap:CommercialPortfolioSegment


Financing
Period End2021-03-31
Value90
Percentage of FinancingReceivableBeforeAllowanceForCreditLossReclassificationDuringPeriod100.0

us-gaap:ConsumerPortfolioSegment


Financing
Period End2021-03-31
Value23
Percentage of FinancingReceivableBeforeAllowanceForCreditLossReclassificationDuringPeriod25.7

stba:FinancingReceivableCreditLossExpenseReversalCOVID19AssessmentForecastComponent us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

stba:FinancingReceivableCreditLossExpenseReversalCOVID19AssessmentForecastComponent

stba:PaycheckProtectionProgramLoanCARESAct


Financing
Period End2020-09-30
Value-13.3
Percentage of FinancingReceivableCreditLossExpenseReversalCOVID19AssessmentForecastComponent100.0

stba:FinancingReceivableCreditLossExpenseReversalPeriodIncreaseDecrease us-gaap:UnusualOrInfrequentItem

stba:FinancingReceivableCreditLossExpenseReversalPeriodIncreaseDecrease

stba:COVID19


Financing
Period End2021-06-302021-03-312020-06-302020-03-31
Value-84200000.0-16900000.0-86800000.0-20000000.0
Percentage of FinancingReceivableCreditLossExpenseReversalPeriodIncreaseDecrease100.0100.0100.0100.0

stba:FinancingReceivableNonTDRRestructuringPostmodification us-gaap:FinancingReceivablePortfolioSegment, us-gaap:LoanRestructuringModificationName

stba:FinancingReceivableNonTDRRestructuringPostmodification

us-gaap:CommercialPortfolioSegment, stba:PaycheckProtectionProgramLoanCARESAct


Financing
Period End2021-06-302021-03-31
Value6.961
Percentage of FinancingReceivableNonTDRRestructuringPostmodification100.0100.0

stba:FinancingReceivableNonTDRRestructuringPostmodification us-gaap:LoanRestructuringModificationName

stba:PaycheckProtectionProgramLoanCARESAct


Financing
Period End2020-12-312020-09-30
Value-154.4-1050.0
Percentage of FinancingReceivableNonTDRRestructuringPostmodification0.00.0

stba:FinancingReceivableNonperformingAssetsPeriodIncreaseDecrease us-gaap:FinancialInstrumentPerformanceStatus

stba:FinancingReceivableNonperformingAssetsPeriodIncreaseDecrease

stba:PerformingFinancialInstrumentConvertedToNonperforming


Financing
Period End2021-06-302021-03-31
Value2211
Percentage of FinancingReceivableNonperformingAssetsPeriodIncreaseDecrease100.0100.0

stba:FinancingReceivableTroubledDebtRestructuringReturnedToAccruingStatus

stba:FinancingReceivableTroubledDebtRestructuringReturnedToAccruingStatus


Financing
Period End2021-06-302020-06-30
Value500000.0100000.0
Percentage of FinancingReceivableTroubledDebtRestructuringReturnedToAccruingStatus100.0100.0

stba:IncreaseDecreaseFinancingReceivableModificationsDifferenceInRecordedInvestments

stba:IncreaseDecreaseFinancingReceivableModificationsDifferenceInRecordedInvestments


Increase
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value-1197000.0-131000.0-66000.00759000.0-336000.0-76000.0-23000.0-549000.0-16000.0218000.0-106000.067000.0377000.0-5000.0-4000.0648000.052000.0-2514000.0-32000.0-304000.0-15000.00-27000.0-118000.0-31000.0
Percentage of IncreaseDecreaseFinancingReceivableModificationsDifferenceInRecordedInvestments100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0

stba:NoninterestIncomeExcludingDebtAndEquitySecuritiesGainLoss

stba:NoninterestIncomeExcludingDebtAndEquitySecuritiesGainLoss


Noninterest
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1516151215131211
Percentage of NoninterestIncomeExcludingDebtAndEquitySecuritiesGainLoss100.0100.0100.0100.0100.0100.0100.0100.0

stba:ProceedsFromRepaymentsOfOtherShortTermDebt

stba:ProceedsFromRepaymentsOfOtherShortTermDebt


Proceeds
Period End2021-06-302021-03-312020-06-302020-03-31
Value0.0-75.0-325.699128
Percentage of ProceedsFromRepaymentsOfOtherShortTermDebt0.0100.0100.0100.0

stba:ProceedsFromSaleOfLoansNotOriginatedForResale

stba:ProceedsFromSaleOfLoansNotOriginatedForResale


Proceeds
Period End2021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value640000.000055000.00465000.0
Percentage of ProceedsFromSaleOfLoansNotOriginatedForResale100.00.00.00.0100.00.0100.0

stba:WeightedAverageCommonSharesOutstandingDilutedTwoClassMethod

stba:WeightedAverageCommonSharesOutstandingDilutedTwoClassMethod


Weighted
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
Value3939-0.028093939390.271746343434-0.0084663434340.0054553434340.0046263434340.2885583434310.0095632929290.001352929290.2180712928280.019392828
Percentage of WeightedAverageCommonSharesOutstandingDilutedTwoClassMethod100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccretionAmortizationOfDiscountsAndPremiumsInvestments

us-gaap:AccretionAmortizationOfDiscountsAndPremiumsInvestments


Accretion
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-1006000.0-1010000.0-1035000.0-1154000.0-773000.0-908000.0-786000.0-776000.0-793000.0-815000.0-776000.0-796000.0-938000.0-1035000.0-1000000.0-1030000.0-1013000.0-955000.0-946000.0-915000.0-918000.0-880000.0-889000.0-913000.0-880000.0-902000.0-932000.0-966000.0-1069000.0-981000.0-915000.0-861000.0-689000.0-587000.0-547000.0-457000.0-347000.0-264000.0-262000.0-318000.0-249000.0-241000.0
Percentage of AccretionAmortizationOfDiscountsAndPremiumsInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationOtherLongtermIncentivePlansRequisiteServicePeriodRecognition

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationOtherLongtermIncentivePlansRequisiteServicePeriodRecognition


Adjustments
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
Value700000.0685000.0-121000.0372000.030000.0443000.0621000.0840000.0376000.0604000.0660000.0452000.0267000.0512000.0655000.0510000.0841000.01002000.0682000.0583000.0548000.0731000.0404000.0408000.0539000.0319000.0257000.0246000.0245000.0185000.0162000.0163000.0143000.0118000.0228000.0278000.0
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationOtherLongtermIncentivePlansRequisiteServicePeriodRecognition100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationOtherLongtermIncentivePlansRequisiteServicePeriodRecognition us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
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
Value700000.0685000.0-121000.0372000.030000.0443000.0621000.0840000.0376000.0604000.0660000.0452000.0267000.0512000.0655000.0510000.0841000.01002000.0682000.0583000.0548000.0731000.0404000.0408000.0539000.0319000.0257000.0246000.0245000.0185000.0162000.0163000.0143000.0118000.0228000.0278000.0
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationOtherLongtermIncentivePlansRequisiteServicePeriodRecognition100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount

us-gaap:AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount


Affordable
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-30
Value500000.0600000.0600000.0600000.02000000.0700000.0700000.0700000.0800000.0800000.0800000.0800000.0800000.0900000.0900000.0900000.01000000.0900000.0900000.0900000.01000000.01000000.01000000.01000000.01000000.01100000.01100000.0
Percentage of AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization us-gaap:IncomeStatementLocation

us-gaap:AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization

stba:NoninterestExpense


Amortization
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value400000.0500000.0500000.0600000.0600000.0700000.0700000.0700000.0
Percentage of AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BusinessCombinationAcquisitionRelatedCosts

us-gaap:BusinessCombinationAcquisitionRelatedCosts


Business
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312012-12-31
Value0.00.00.02.342100.5520.6180.00.00.00.00.00.00.00.00.00.00.8662.3010.6890.00.00.00.7
Percentage of BusinessCombinationAcquisitionRelatedCosts0.00.00.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.0100.0100.0100.00.00.00.0100.0

us-gaap:BusinessCombinationAcquisitionRelatedCosts us-gaap:BusinessAcquisition

stba:DNBFinancialCorporation


Business
Period End2020-12-312020-09-302020-06-302020-03-31
Value0.00.00.02.3
Percentage of BusinessCombinationAcquisitionRelatedCosts0.00.00.098.2

us-gaap:BusinessCombinationConsiderationTransferred1 us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationConsiderationTransferred1

stba:DNBFinancialCorporation


Business
Period End2020-11-302020-09-302019-11-30
Value200200201
Percentage of BusinessCombinationConsiderationTransferred1100.0100.0100.0

us-gaap:BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred

stba:DNBFinancialCorporation


Business
Period End2020-11-302020-06-30
Value1800000.0-100000.0
Percentage of BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred100.0100.0

us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:CommonStockDividendsPerShareDeclared


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value0.280.280.280.280.280.280.280.270.270.270.270.250.250.220.220.20.20.20.20.190.190.190.190.180.180.180.180.170.170.160.160.150.150.150.150.150.150.150.150.150.150.150.150.150.15
Percentage of CommonStockDividendsPerShareDeclared100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposure

us-gaap:ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposure


Concentration
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
Value2132349-64.78829257205226292981537389.212-38.8881533-5.9495.4693.8151498-32.115-56.114171665828284146749-13.685961099-6.057101-2.7341024-40.97252
Percentage of ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposure us-gaap:OtherCommitments

us-gaap:CommitmentsToExtendCredit


Concentration
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
Value2152261-65.354242591967257929814633417-40.6121454-1.4787.04-0.1371415-36.468-55.6152615748184831370
Percentage of ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposure100.996.2100.981.0100.895.998.199.2100.395.288.6186.3104.494.824.8128.7-3.694.5113.699.1156.994.698.7102.798.393.4

us-gaap:StandbyLettersOfCredit


Concentration
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
Value-1.886880.5665.623-2.115854.9860.784-0.302744.376-7.9511.72478-4.471-1.5713.952834.353-0.499-9.721901.064-2.2261.45297
Percentage of ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposure-0.93.8-0.919.0-0.84.11.90.8-0.34.811.4-86.3-4.45.275.2-28.7103.65.5-13.60.9-56.95.41.3-2.71.76.6

us-gaap:DebtAndEquitySecuritiesGainLoss

us-gaap:DebtAndEquitySecuritiesGainLoss


Debt
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value29000.000142000.00-26000.00000000-987000.003617000.0
Percentage of DebtAndEquitySecuritiesGainLoss100.00.00.0100.00.0100.00.00.00.00.00.00.00.0100.00.0100.0

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value298000.0248000.0411000.0385000.0384000.0-1177000.0395000.0395000.0394000.0-1601000.0512000.0545000.0544000.0-1424000.0475000.0475000.0474000.030000.029000.0-35000.0-35000.0-34000.0-34000.0-35000.0-35000.0-33000.0-34000.0-35000.0-35000.0-36000.0-34000.0-34000.0-34000.0236000.0-34000.0-33000.0-32000.012000.0-2000.0-1000.0
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value02.4203.4155-0.00050.0350000.048
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets0.0100.00.0100.0100.0100.00.00.00.0100.0

us-gaap:DefinedBenefitPlanBenefitObligationPaymentForSettlement

us-gaap:DefinedBenefitPlanBenefitObligationPaymentForSettlement


Defined
Period End2021-06-302021-03-312020-09-30
Value200000.0700000.0700000.0
Percentage of DefinedBenefitPlanBenefitObligationPaymentForSettlement100.0100.0100.0

us-gaap:DefinedBenefitPlanContributionsByEmployer

us-gaap:DefinedBenefitPlanContributionsByEmployer


Defined
Period End2020-12-312020-09-302018-09-07
Value0.0150.120
Percentage of DefinedBenefitPlanContributionsByEmployer100.0100.0100.0

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value645000.0716000.01012000.0970000.0971000.0972000.01190000.01181000.01181000.01180000.01566000.01566000.01567000.01567000.01567000.01582000.01582000.01582000.01443000.01444000.01434000.01459000.01795000.01772000.01807000.01807000.01727000.01710000.01735000.01735000.01551000.01526000.01565000.01565000.0-9736000.01364000.01404000.01404000.0-9411000.01344000.01346000.0
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanInterestCost

us-gaap:DefinedBenefitPlanInterestCost


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value797000.0703000.0770000.0905000.0890000.0891000.01020000.0989000.0989000.0989000.0970000.0978000.0967000.0967000.01025000.01025000.01025000.01025000.01096000.01099000.01036000.01065000.01106000.01120000.01100000.01100000.01117000.01141000.01106000.01106000.0996000.0997000.0996000.0996000.01089000.01117000.01076000.01076000.01041000.01035000.01044000.0
Percentage of DefinedBenefitPlanInterestCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value627000.0984000.0159000.01017000.0304000.0303000.0257000.0203000.0203000.0203000.0-63000.0-76000.0-55000.0-56000.0-100000.0-82000.0-82000.0-83000.0-703000.0316000.093000.0589000.0434000.0506000.0398000.0398000.0184000.0200000.0176000.0176000.0708000.0738000.0693000.0693000.0-6859000.01066000.0937000.0937000.0-3362000.0366000.0537000.0
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1


Defined
Period End2021-06-302021-03-312020-12-312020-09-30
Value-200000.0-700000.0-133000.0-700000.0
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1100.0100.0100.0100.0

us-gaap:DepreciationAmortizationAndAccretionNet

us-gaap:DepreciationAmortizationAndAccretionNet


Depreciation
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value4176000.01601000.0697000.01171000.01350000.01541000.01452000.01420000.01290000.01135000.01157000.01017000.0901000.0747000.0481000.0369000.0770000.0980000.0972000.0906000.0362000.0-394000.0-1072000.01460000.01193000.01201000.01194000.01115000.01013000.01259000.01471000.01590000.01694000.01845000.01954000.01507000.01465000.01530000.01863000.01465000.01636000.01585000.0
Percentage of DepreciationAmortizationAndAccretionNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:DerivativeGainLossOnDerivativeNet

us-gaap:ForwardContracts, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-09-30
Value194000.0979000.0929000.0144000.0698000.0-1293000.0-63000.0169000.0-193000.033000.0-6000.099000.0-15000.0-19000.042000.0-30000.076000.0-36000.071000.0106000.0-132000.0-67000.0121000.0-143000.092000.0-17000.049000.0
Percentage of DerivativeGainLossOnDerivativeNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestRateLockCommitments, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-09-302014-06-30
Value-883000.0-1759000.0-1162000.086000.0186000.02606000.0-134000.0-194000.0310000.088000.022000.0-169000.0128000.045000.0-227000.0-4000.0-13000.0233000.0-503000.097000.0117000.0265000.0-313000.0208000.0-8000.0136000.0-105000.0199000.0
Percentage of DerivativeGainLossOnDerivativeNet-455.2-179.7-125.159.726.6-201.5212.7-114.8-160.6266.7-366.7-170.7-853.3-236.8-540.513.3-17.1-647.2-708.591.5-88.6-395.5-258.7-145.5-8.7-800.0-214.30.0

us-gaap:InterestRateSwap, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-09-30
Value5000.0310000.0-261000.0-537000.0-62000.0114000.0-20000.0-16000.026000.0-122000.0200000.031000.0-201000.0115000.0-8000.09000.0-8000.024000.0-50000.0-87000.023000.097000.0-28000.029000.0-21000.013000.0-10000.0
Percentage of DerivativeGainLossOnDerivativeNet2.631.7-28.1-372.9-8.9-8.831.7-9.5-13.5-369.7-3333.331.31340.0-605.3-19.0-30.0-10.5-66.7-70.4-82.1-17.4-144.8-23.1-20.3-22.8-76.5-20.4

us-gaap:DerivativeGainLossOnDerivativeNet us-gaap:HedgingDesignation

us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value-684000.0-470000.0-494000.0-307000.0822000.01427000.0-217000.0-41000.0143000.0-1000.0216000.0-39000.0-88000.0141000.0-193000.0-25000.055000.0221000.0-482000.0116000.08000.0295000.0-220000.094000.063000.0132000.06000.0-66000.0124000.0-29000.067000.0-298000.088000.0-331000.0-210000.0137000.0169000.0
Percentage of DerivativeGainLossOnDerivativeNet-352.6-48.0-53.2-213.2117.8-110.4344.4-24.3-74.1-3.0-3600.0-39.4586.7-742.1-459.583.372.4-613.9-678.9109.4-6.1-440.3-181.8-65.768.5-776.50.0-134.70.00.00.00.00.00.00.00.00.0

us-gaap:DividendIncomeOperating

us-gaap:DividendIncomeOperating


Dividend
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value152000.0173000.0178000.0227000.0231000.0453000.0451000.0394000.0415000.0564000.0483000.0490000.0580000.0671000.0413000.0389000.0481000.0482000.0398000.0375000.0336000.0366000.0337000.0581000.0286000.0586000.096000.095000.095000.0104000.095000.094000.094000.0102000.0108000.082000.0109000.0106000.0-36000.0163000.0182000.0102000.0134000.0121000.0113000.0
Percentage of DividendIncomeOperating100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCommonStockCash

us-gaap:DividendsCommonStockCash


Dividends
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value1010101010119.5629.2399.2429.3179.4248.7248.7227.6697.676.9726.9676.966.966.6136.616.6016.6016.2786.2515.3575.3455.0485.0524.7584.7584.4614.4584.464.464.3414.3364.224.2164.2134.2084.1934.1784.173
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCommonStockCash us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Dividends
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value1010101010119.5629.2399.2429.3179.4248.7248.7227.6697.676.9726.9676.966.966.6136.616.6016.6016.2786.2515.3575.3455.0485.0524.7584.7584.4614.4584.464.464.3414.3364.224.2164.2134.2084.1934.1784.173
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquipmentExpense

us-gaap:EquipmentExpense


Equipment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value2.4022.643.0852.443.0062.5192.3372.092.3012.231.9872.0052.1341.9572.21.891.812.0471.711.9321.7191.9291.6321.6531.5821.2261.4611.3081.2771.2711.261.0841.231.3081.4011.4141.2091.2381.1361.2631.3651.1771.4921.1761.313
Percentage of EquipmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquitySecuritiesFvNiGainLoss

us-gaap:EquitySecuritiesFvNiGainLoss


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value28000.0116000.052000.0585000.0448000.0-1585000.0444000.0156000.052000.0-318000.0-499000.0-111000.0230000.052000.0
Percentage of EquitySecuritiesFvNiGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquitySecuritiesFvNiRealizedGainLoss

us-gaap:EquitySecuritiesFvNiRealizedGainLoss


Equity
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3000.000142000.0000000000
Percentage of EquitySecuritiesFvNiRealizedGainLoss100.00.00.0100.00.00.00.00.00.00.00.00.00.0

us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss

us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value25000.0116000.052000.0585000.0306000.0-1585000.01445000.0156000.052000.0-318000.0830000.0-111000.0230000.052000.0
Percentage of EquitySecuritiesFvNiUnrealizedGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FederalDepositInsuranceCorporationPremiumExpense

us-gaap:FederalDepositInsuranceCorporationPremiumExpense


Federal
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1832000.01046000.01371000.01900000.01048000.0770000.0222000.0-675000.0695000.0516000.0646000.0746000.0739000.01108000.01082000.01152000.01185000.01123000.01046000.01005000.0994000.0940000.0923000.0990000.0808000.0695000.0619000.0607000.0579000.0631000.0660000.0629000.0707000.0776000.0762000.0838000.0719000.0608000.0678000.0749000.0917000.01226000.01368000.01359000.01398000.0
Percentage of FederalDepositInsuranceCorporationPremiumExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FeesAndCommissionsMortgageBankingAndServicing

us-gaap:FeesAndCommissionsMortgageBankingAndServicing


Fees
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value4.7444.313.13.9642.6231.2360.7650.5940.6370.4940.6290.70.8310.6020.6350.8720.6750.7330.6941.0770.5780.5290.5480.6980.7820.5250.2510.270.2640.1320.4650.2650.9110.4820.7040.7970.7050.6710.775-0.4470.2460.6251.2531.5730.166
Percentage of FeesAndCommissionsMortgageBankingAndServicing100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery

us-gaap:FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value7.4735.812111268111.9974.2772.135
Percentage of FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:CommercialPortfolioSegment, stba:BusinessBanking


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value0.3630.751-0.0191.6840.220.386
Percentage of FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery4.912.9-0.213.00.33.5

us-gaap:CommercialPortfolioSegment, stba:CommercialAndIndustrial


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value0.4624.1650.450.798619.86-0.1211.257
Percentage of FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery6.271.74.06.290.588.4-6.129.4

us-gaap:CommercialPortfolioSegment, us-gaap:CommercialRealEstate


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value6.5940.8110105.5620.4150.8282.298
Percentage of FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery88.213.990.877.68.23.741.553.7

us-gaap:CommercialPortfolioSegment, us-gaap:ConstructionLoans


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-0.002-0.0010.293-0.001-0.0190.2270.405-0.001
Percentage of FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery-0.0-0.02.6-0.0-0.02.020.3-0.0

us-gaap:ConsumerPortfolioSegment, stba:ConsumerRealEstate


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-0.0760.1890.1630.2110.0150.1340.4960.302
Percentage of FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery-1.03.31.51.60.01.224.87.1

us-gaap:ConsumerPortfolioSegment, stba:OtherConsumer


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value0.132-0.1020.1480.2060.6820.1340.3890.421
Percentage of FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery1.8-1.81.31.61.01.219.59.8

us-gaap:FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease

us-gaap:FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease


Financing
Period End2020-09-30
Value-13.5
Percentage of FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease100.0

us-gaap:FinancingReceivableAllowanceForCreditLossesRecovery

us-gaap:FinancingReceivableAllowanceForCreditLossesRecovery


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value1264000.0720000.01712000.0754000.0231000.0274000.0801000.0423000.0532000.0
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableAllowanceForCreditLossesRecovery us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:CommercialPortfolioSegment, stba:BusinessBanking


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value47000.0166000.0162000.064000.040000.074000.0
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery3.723.19.58.517.327.0

us-gaap:CommercialPortfolioSegment, stba:CommercialAndIndustrial


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value11000.0137000.01140000.0398000.04000.019000.0670000.0210000.0
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery0.919.066.652.81.76.983.649.6

us-gaap:CommercialPortfolioSegment, us-gaap:CommercialRealEstate


Financing
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value965000.029000.0172000.038000.027000.03000.06000.0
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery76.31.722.816.59.90.41.4

us-gaap:CommercialPortfolioSegment, us-gaap:ConstructionLoans


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value2000.01000.0161000.01000.019000.02000.01000.01000.0
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery0.20.19.40.18.20.70.10.2

us-gaap:ConsumerPortfolioSegment, stba:ConsumerRealEstate


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value152000.082000.034000.041000.022000.038000.042000.0102000.0
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery12.011.42.05.49.513.95.224.1

us-gaap:ConsumerPortfolioSegment, stba:OtherConsumer


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value88000.0334000.0186000.078000.0108000.0114000.085000.0104000.0
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery7.046.410.910.346.841.610.624.6

us-gaap:FinancingReceivableAllowanceForCreditLossesRecovery us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

stba:CustomerFraud


Financing
Period End2021-06-30
Value900000.0
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery71.2

us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs

us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value8.7376.532121368112.7984.72.667
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:CommercialPortfolioSegment, stba:BusinessBanking


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value0.410.9170.1431.7480.260.46
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs4.714.01.112.80.44.0

us-gaap:CommercialPortfolioSegment, stba:CommercialAndIndustrial


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value0.4734.3021.591.196619.8790.5491.467
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs5.465.912.38.890.286.419.631.2

us-gaap:CommercialPortfolioSegment, us-gaap:CommercialRealEstate


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value7.5580.8110105.60.4420.8312.304
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs86.512.479.074.58.23.929.749.0

us-gaap:ConsumerPortfolioSegment, stba:ConsumerRealEstate


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value0.0760.2710.1970.2520.0370.1720.5380.404
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs0.94.11.51.80.11.519.28.6

us-gaap:ConsumerPortfolioSegment, stba:OtherConsumer


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value0.2210.2320.3340.2840.790.2480.4740.525
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs2.53.62.62.11.22.216.911.2

us-gaap:FinancingReceivableModificationsPostModificationRecordedInvestment2

us-gaap:FinancingReceivableModificationsPostModificationRecordedInvestment2


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value1.3776.865114.5621.3048.297-4.506256.4275.499-0.3150.6335.1556.771.621.4712.6650.438-3.5835.0038.1932.6140.9851.5780.7964.5851.5791.1790.2291.7910.9821.7585.6942.5848.412.3243.674
Percentage of FinancingReceivableModificationsPostModificationRecordedInvestment2100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableModificationsPreModificationRecordedInvestment2

us-gaap:FinancingReceivableModificationsPreModificationRecordedInvestment2


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value1.3846.914124.6931.378.297-5.265266.5045.5220.2340.6494.9376.8761.5531.0942.670.442-4.2314.951102.6461.2891.5930.7964.6121.6971.210.2331.8081.3091.7855.7132.9728.8962.9723.786
Percentage of FinancingReceivableModificationsPreModificationRecordedInvestment2100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1

us-gaap:FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1


Financing
Period End2020-12-312020-09-302020-06-302020-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-30
Value-6.3-3.00.1210.00.00.616-0.3070.00.1190.188-0.0080.00.00.0720.0961.0020.0790.1360.270.509
Percentage of FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1100.0100.0100.0100.00.00.0100.0100.00.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableNonaccrualInterestIncome

us-gaap:FinancingReceivableNonaccrualInterestIncome


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value426000.0352000.0326000.0189000.0145000.0881000.0
Percentage of FinancingReceivableNonaccrualInterestIncome100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableNonaccrualInterestIncome us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:CommercialPortfolioSegment, stba:BusinessBanking


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value139000.0137000.0112000.059000.057000.058000.0
Percentage of FinancingReceivableNonaccrualInterestIncome32.638.934.431.239.36.6

us-gaap:CommercialPortfolioSegment, stba:CommercialAndIndustrial


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value72000.043000.049000.031000.09000.064000.0
Percentage of FinancingReceivableNonaccrualInterestIncome16.912.215.016.46.27.3

us-gaap:CommercialPortfolioSegment, us-gaap:CommercialRealEstate


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value5000.061000.03000.08000.03000.0684000.0
Percentage of FinancingReceivableNonaccrualInterestIncome1.217.30.94.22.177.6

us-gaap:ConsumerPortfolioSegment, stba:ConsumerRealEstate


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value210000.0110000.0161000.090000.075000.047000.0
Percentage of FinancingReceivableNonaccrualInterestIncome49.331.249.447.651.75.3

us-gaap:ConsumerPortfolioSegment, stba:OtherConsumer


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value01000.001000.01000.028000.0
Percentage of FinancingReceivableNonaccrualInterestIncome0.00.30.00.50.73.2

us-gaap:FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown us-gaap:FinancialInstrumentPerformanceStatus, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown

stba:PerformingFinancialInstrumentConvertedToNonperforming, us-gaap:CommercialPortfolioSegment, stba:CommercialAndIndustrial


Financing
Period End2021-06-302021-03-312020-12-31
Value03900000.01600000.0
Percentage of FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown0.0100.0100.0

stba:PerformingFinancialInstrumentConvertedToNonperforming, us-gaap:CommercialPortfolioSegment, us-gaap:CommercialRealEstate


Financing
Period End2020-09-30
Value10000000.0
Percentage of FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown0.0

us-gaap:GainLossOnSaleOfMortgageLoans

us-gaap:GainLossOnSaleOfMortgageLoans


Gain
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value3079000.03486000.01897000.0536000.0587000.0617000.0390000.0293000.0342000.0512000.0387000.0296000.0490000.0342000.0526000.0193000.0467000.0475000.0448000.0231000.0314000.0133000.0394000.0203000.0121000.0147000.063000.022000.098000.0129000.0318000.0329000.0533000.0480000.0336000.0263000.0331000.01094000.0-919000.0369000.0943000.01159000.0
Percentage of GainLossOnSaleOfMortgageLoans100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GoodwillPurchaseAccountingAdjustments us-gaap:BusinessAcquisition

us-gaap:GoodwillPurchaseAccountingAdjustments

stba:DNBFinancialCorporation


Goodwill
Period End2020-11-302020-06-302019-11-30
Value1803000.0-141000.0-15525000.0
Percentage of GoodwillPurchaseAccountingAdjustments100.0100.0100.0

us-gaap:IncreaseDecreaseInAccruedInterestReceivableNet

us-gaap:IncreaseDecreaseInAccruedInterestReceivableNet


Increase
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-2872000.02231000.03227000.0-26000.03056000.0-523000.0-728000.01963000.0129000.0986000.0856000.0-336000.0-1172000.03220000.0604000.062000.0-1610000.0534000.0717000.02768000.0464000.0-262000.0254000.02288000.0329000.0361000.0-300000.0543000.0109000.0-1201000.0446000.0776000.0-922000.0864000.0-278000.0-637000.0627000.0-795000.0-475000.054000.0244000.0-1414000.0
Percentage of IncreaseDecreaseInAccruedInterestReceivableNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInDemandDeposits

us-gaap:IncreaseDecreaseInDemandDeposits


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value190522-154.648-156.3538742828147751701038032145664-17.30562208639213-64.136-37.615562406434-15.986157-64.337681.867-28.86688-8.56879484661-8.7356.9916426
Percentage of IncreaseDecreaseInDemandDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseNet

us-gaap:IncreaseDecreaseInFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseNet


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value1.172.25422-49.45322495.963-0.229-9.2735.044-26.8170.4760.107-5.544-3.8459.884-7.531-11.546-2.06119-3.264-0.486167.521-2.185-13.1654.5870.557-40.8619.7941.77513-1.2496.10210-12.0391.2972.843-2.384-7.5353.693
Percentage of IncreaseDecreaseInFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInInterestPayableNet

us-gaap:IncreaseDecreaseInInterestPayableNet


Increase
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-1296000.0-45000.0-1595000.0-242000.0-824000.0183000.0-793000.0-789000.01550000.0104000.01419000.0-720000.0901000.0202000.0681000.0-435000.0598000.0-9000.0251000.0875000.0444000.0-162000.0-101000.0-374000.0296000.0-237000.098000.0-284000.0225000.0-989000.0-147000.0-1094000.0-125000.0-800000.0-386000.0-65000.0-264000.083000.0-422000.0160000.041000.0-892000.0
Percentage of IncreaseDecreaseInInterestPayableNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherOperatingAssets

us-gaap:IncreaseDecreaseInOtherOperatingAssets


Increase
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-31.81892-71.462149-29.245207.543.466-9.596-1.2054.973-4.123.101-4.251-1.08-3.404-3.966-3.6022.1860.71424-11.3621.091-2.9453.121-0.733-6.368-3.648-4.138-4.3-15.378-1.865-6.339-7.067-3.001-2.408-0.9973.496-5.878-0.753-14.3178.772
Percentage of IncreaseDecreaseInOtherOperatingAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherOperatingLiabilities

us-gaap:IncreaseDecreaseInOtherOperatingLiabilities


Increase
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-7.604-3.0385.13255-10.24118105.6-5.7477.375-1.3073.8364.9721.844-3.5431.768-8.199-0.541-3.147.267-0.2332.342-2.8722.0613.492-2.096-0.8622.0611.626-1.562-0.952-20.029-1.48155.039-0.852-4.595.6481.853-11.4425.693.791
Percentage of IncreaseDecreaseInOtherOperatingLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInTimeDeposits

us-gaap:IncreaseDecreaseInTimeDeposits


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-50.779-67.003-58.533-77.566-63.965-7.04257-21.87-52.495-11.241102-6.948-25.698-55.557-33.916-31.379-8.372100-81.517-38.5369.2631286355-24.98-43.417-57.041.519123842-23.0578.03428-44.77-20.654-83.746-68.14118-43.722-43.15-18.708-51.105-18.915
Percentage of IncreaseDecreaseInTimeDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InformationTechnologyAndDataProcessing

us-gaap:InformationTechnologyAndDataProcessing


Information
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value3.7874.2253.8284.2183.5853.8684.1413.6813.4143.2333.0232.9062.3792.3252.1312.2842.1352.2512.0832.1292.7232.1112.3482.4542.5552.322.2712.1522.2192.0952.0832.1372.1372.6642.1722.0122.1953.241.9251.7431.6811.5041.5441.5471.451
Percentage of InformationTechnologyAndDataProcessing100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestAndDividendIncomeOperating

us-gaap:InterestAndDividendIncomeOperating


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value717475768087827979787673716867666461595755555353524341403938383838373838393940404142444545
Percentage of InterestAndDividendIncomeOperating100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestAndFeeIncomeLoansCommercial

us-gaap:InterestAndFeeIncomeLoansCommercial


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value299000.095000.0812000.0499000.0945000.02484000.02356000.01464000.01102000.0581000.0
Percentage of InterestAndFeeIncomeLoansCommercial100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestExpenseDeposits

us-gaap:InterestExpenseDeposits


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value2.6523.4814.7956.6269.227151516161412109.1667.8467.2276.7485.9765.3795.2895.1195.0294.2543.6113.2753.0513.0072.6622.482.4762.512.5362.7172.9513.2023.6123.9584.4754.7515.1885.7455.9576.0626.6027.0147.44
Percentage of InterestExpenseDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestIncomeExpenseAfterProvisionForLoanLoss

us-gaap:InterestIncomeExpenseAfterProvisionForLoanLoss


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value65676251-16.61149625658545758495456545148464844444446463936363735343133313031262431323324282827
Percentage of InterestIncomeExpenseAfterProvisionForLoanLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestIncomeSecuritiesTaxExempt

us-gaap:InterestIncomeSecuritiesTaxExempt


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value690000.0813000.0851000.0885000.0959000.0870000.0836000.0787000.0834000.0844000.0846000.0857000.0872000.0874000.0871000.0896000.0928000.0920000.0894000.0907000.0915000.0942000.0948000.0988000.0998000.01020000.0985000.0964000.0979000.0929000.0888000.0865000.0815000.0833000.0802000.0788000.0778000.0753000.0669000.0525000.0555000.0598000.0626000.0683000.0725000.0
Percentage of InterestIncomeSecuritiesTaxExempt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestIncomeSecuritiesTaxable

us-gaap:InterestIncomeSecuritiesTaxable


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value3.7933.5633.3713.4733.7914.2153.7443.5523.6473.793.7453.6493.5193.4293.1642.9882.9472.8482.6362.572.582.5532.4942.5222.3942.3832.5032.3132.1841.9831.8471.8891.8791.8631.8841.8291.8871.9442.2252.0542.0781.8431.6441.8032.061
Percentage of InterestIncomeSecuritiesTaxable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LaborAndRelatedExpense

us-gaap:LaborAndRelatedExpense


Labor
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value242322242121221920201819181820201920191917201716171614141515151414161414141613111213121111
Percentage of LaborAndRelatedExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:MarketingExpense

us-gaap:MarketingExpense


Marketing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value996000.01322000.02113000.01793000.0979000.01111000.01117000.01062000.01310000.01141000.01276000.01023000.01190000.0702000.01191000.0766000.0948000.0754000.0841000.0896000.01075000.0901000.01319000.0895000.01193000.0816000.0981000.0757000.0960000.0618000.0841000.0607000.0793000.0689000.01146000.0759000.0655000.0742000.0964000.0747000.0706000.0601000.0
Percentage of MarketingExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NoninterestExpense

us-gaap:NoninterestExpense


Noninterest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value454548484346503740383637353637363636353434383333353329283028292728312931293226242527272425
Percentage of NoninterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NoninterestIncome

us-gaap:NoninterestIncome


Noninterest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value151715161512151312111112121313131612121312151312131211111111111212141114121311101111121211
Percentage of NoninterestIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NoninterestIncomeOther

us-gaap:NoninterestIncomeOther


Noninterest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1809000.02252000.02398000.02507000.02974000.0-719000.0-771000.03481000.03489000.02693000.01540000.02266000.02134000.02188000.02497000.01457000.02045000.02169000.02288000.02227000.02101000.02911000.02140000.01572000.02417000.01687000.01720000.01475000.01907000.01640000.01892000.02224000.01848000.01979000.01476000.01447000.01861000.01852000.0-321000.01899000.02133000.01276000.025000.01977000.02070000.0
Percentage of NoninterestIncomeOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OccupancyNet

us-gaap:OccupancyNet


Occupancy
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value3.4343.8273.8863.4413.4373.7653.222.8982.9493.0362.6982.7222.8042.8732.7362.6922.7512.8152.6442.7762.6882.952.6382.7442.6822.5881.9932.0041.9842.231.9861.911.9582.1692.0111.9781.8321.7841.6951.6531.7381.8571.6111.6741.659
Percentage of OccupancyNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OciBeforeReclassificationsBeforeTaxAttributableToParent us-gaap:StatementEquityComponents

us-gaap:OciBeforeReclassificationsBeforeTaxAttributableToParent

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Oci
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
Value0.324-9.712-2.2-0.8824.20121-2.9232.358.9687.3988.497-3.521-2.296-9.474-5.461-0.1482.6721.662-14.647-1.9214.6369.033
Percentage of OciBeforeReclassificationsBeforeTaxAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent us-gaap:StatementEquityComponents

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Oci
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
Value0.255-7.64-1.733-0.6943.30716-2.2991.8497.0565.826.699-2.773-1.809-7.462-3.543-0.0961.7341.078-9.529-1.2493.0145.871
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal

us-gaap:OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal


Off
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value555000.0-164000.0-721000.0-1816000.0927000.01616000.0671000.095000.0
Percentage of OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal us-gaap:UnusualOrInfrequentItem

stba:COVID19


Off
Period End2021-06-30
Value600000.0
Percentage of OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal108.1

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsTax us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsTax

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


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
Value69000.0-2072000.0-467000.0-188000.0894000.04592000.0-624000.0501000.01912000.01578000.01798000.0-748000.0-487000.0-2012000.0-1918000.0-52000.0938000.0584000.0-5118000.0-672000.01622000.03162000.0
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent


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
Value3.234-10.055-0.6010.2814.52322-5.5382.8049.427.85112-2.931-1.594-8.853-8.0830.391-0.4061.831-12.562-1.3775.18112-10.3415.824-5.3755.712-10.105-1.7635.5724.686130.963-11.463-1.172-3.2492.9531.0720.034
Percentage of OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLoss


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
Value2.91-0.3431.4571.1630.4640.465-2.6410.4540.4520.4534.3840.590.7020.621-3.6090.5390.5390.5392.0850.5440.5453.8
Percentage of OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent90.03.4-242.4413.910.32.147.716.24.85.834.0-20.1-44.0-7.044.6137.9-132.829.4-16.6-39.510.529.6

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent


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
Value2.544-7.91-0.4820.2213.5617-4.3572.2067.4126.17610-2.308-1.256-6.973-5.8230.254-0.2621.188-8.141-0.8953.3688.341-6.7213.785-3.4933.805-6.661-1.1453.6223.0468.4740.627-7.452-0.761-2.1121.9190.6970.022
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLoss


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-03-31
Value2.289-0.271.1390.9150.3650.366-2.0780.3570.3560.3563.4470.4650.5530.489-2.9210.350.3510.351.3880.3542.47
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent90.03.4-236.3414.010.32.147.716.24.85.834.0-20.1-44.0-7.050.2137.8-134.029.5-17.0-39.629.6

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value2.544-7.91-0.4820.2213.5617-4.3572.2067.4126.17610-2.308-1.256-6.973-5.8230.254-0.2621.188-8.141-0.8953.3688.341-6.7213.785-3.4933.805-6.661-1.1463.6223.0468.4740.627-7.452-0.761-2.1121.9190.6970.022
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1

us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1


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
Value690000.0-2145000.0-119000.060000.0963000.04691000.0-1181000.0598000.02008000.01675000.02735000.0-623000.0-338000.0-1880000.0-2260000.0137000.0-144000.0643000.0-4421000.0-482000.01813000.04492000.0-3620000.02039000.0-1882000.01907000.0-3444000.0-618000.01950000.01640000.04564000.0336000.0-4011000.0411000.0-1137000.01034000.0375000.0-12000.0
Percentage of OtherComprehensiveIncomeLossTaxPortionAttributableToParent1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLoss


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
Value621000.0-73000.0318000.0248000.099000.099000.0-563000.097000.096000.097000.0937000.0125000.0149000.0132000.0-688000.0189000.0188000.0189000.0697000.0190000.0191000.01330000.0
Percentage of OtherComprehensiveIncomeLossTaxPortionAttributableToParent190.03.4-267.2413.310.32.147.716.24.85.834.3-20.1-44.1-7.030.4138.0-130.629.4-15.8-39.410.529.6

us-gaap:OtherNoninterestExpense

us-gaap:OtherNoninterestExpense


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value6.3026.2268.1476.366.4688.0336.0675.5296.1745.4845.6055.3925.3795.4036.1355.3665.8245.2585.3644.5695.9856.6365.746.6396.3485.535.4655.05.6065.3995.5814.6314.755.976.1246.7766.1085.1310.8674.354.3734.5342.654.9654.967
Percentage of OtherNoninterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic

us-gaap:ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic


Participating
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
Value141000.0141000.052000.0029000.056000.072000.071000.062000.075000.087000.062000.080000.028000.073000.081000.060000.058000.068000.060000.041000.076000.081000.079000.046000.050000.051000.029000.035000.033000.033000.036000.0
Percentage of ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForOriginationOfMortgageLoansHeldForSale

us-gaap:PaymentsForOriginationOfMortgageLoansHeldForSale


Payments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value8210913137373324142127241626272315302927182529302114158.164.8971017191742251819185.74420235030
Percentage of PaymentsForOriginationOfMortgageLoansHeldForSale100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForProceedsFromFederalHomeLoanBankStock

us-gaap:PaymentsForProceedsFromFederalHomeLoanBankStock


Payments
Period End2021-06-302021-03-312020-06-302020-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value-2093000.0-831000.0-13103000.05277000.0-1744000.0-4603000.06013000.0499000.0-1243000.0296000.0478000.0-2078000.03486000.0575000.04418000.0305000.0-2680000.03201000.04358000.0-4024000.0-3860000.03177000.03855000.0-1666000.0-1420000.01091000.0773000.0-2129000.0-2143000.0-1707000.0
Percentage of PaymentsForProceedsFromFederalHomeLoanBankStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForProceedsFromLoansAndLeases

us-gaap:PaymentsForProceedsFromLoansAndLeases


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value-167.608-33.937-156.116-140.573368122351422665-27.717-56.366912515119237217151107134111306875106626373643977
Percentage of PaymentsForProceedsFromLoansAndLeases100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForRepurchaseOfOtherEquity

us-gaap:PaymentsForRepurchaseOfOtherEquity


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value167000.0135000.00031000.0563000.0024000.015000.0876000.0
Percentage of PaymentsForRepurchaseOfOtherEquity100.0100.00.00.0100.0100.00.0100.0100.0100.0

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt


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
Value64898810503092270.0019.437132426278733
Percentage of PaymentsToAcquireAvailableForSaleSecuritiesDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireBusinessesGross us-gaap:BusinessAcquisition

us-gaap:PaymentsToAcquireBusinessesGross

stba:DNBFinancialCorporation


Payments
Period End2020-11-302020-09-302019-11-30
Value0.360.360.4
Percentage of PaymentsToAcquireBusinessesGross100.0100.0100.0

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value383429944733232820201825232222231816221717171310196.3891010142116269.814138.482283019202017131849
Percentage of ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesDebt

us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesDebt


Proceeds
Period End2020-12-312020-09-302018-12-312018-09-302017-12-312017-09-30
Value0.00.00.00.0580.0
Percentage of ProceedsFromSaleOfAvailableForSaleSecuritiesDebt0.00.00.00.0100.00.0

us-gaap:ProceedsFromSaleOfFederalHomeLoanBankStock

us-gaap:ProceedsFromSaleOfFederalHomeLoanBankStock


Proceeds
Period End2020-12-312020-09-302019-12-312019-09-30
Value2747000.0-626000.02577000.0-2906000.0
Percentage of ProceedsFromSaleOfFederalHomeLoanBankStock100.0100.0100.0100.0

us-gaap:ProceedsFromSaleOfMortgageLoansHeldForSale

us-gaap:ProceedsFromSaleOfMortgageLoansHeldForSale


Proceeds
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value8411012635413319142327241827282116313027192729202114147.5535.9221019203723242018201212294529
Percentage of ProceedsFromSaleOfMortgageLoansHeldForSale100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment

us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value074000.08000.015000.027000.035000.09000.00025000.01000.0109000.046000.0103000.0257000.016000.037000.017000.003000.0203000.0237000.020000.07000.0-2000.034000.0064000.018000.049000.0434000.0142000.00114000.021000.07000.0119000.027000.05000.0253000.0-51000.084000.0
Percentage of ProceedsFromSaleOfPropertyPlantAndEquipment0.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProfessionalFees

us-gaap:ProfessionalFees


Professional
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
Value1637000.01531000.01504000.01911000.01932000.01048000.0862000.01054000.01145000.01184000.01012000.01181000.0888000.01051000.01225000.0870000.0958000.01043000.01177000.01041000.01047000.0947000.01095000.0946000.0801000.0523000.01229000.0950000.0875000.0663000.01045000.0996000.01171000.0974000.01111000.01440000.01208000.01900000.01379000.01173000.01298000.01588000.0
Percentage of ProfessionalFees100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProfessionalFees us-gaap:BusinessAcquisition

stba:DNBFinancialCorporation


Professional
Period End2020-12-312020-09-302020-06-302020-03-31
Value000200000.0
Percentage of ProfessionalFees0.00.00.019.1

us-gaap:ProvisionForLoanLossesExpensed

us-gaap:ProvisionForLoanLossesExpensed


Provision
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value2.0083.3017.8571985182.1064.9132.2052.3074.2152.3047.0249.2722.3371.5351.097107.6768.278
Percentage of ProvisionForLoanLossesExpensed100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProvisionForLoanLossesExpensed us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:CommercialPortfolioSegment, stba:BusinessBanking


Provision
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value-0.560.5141.1062.0720.9181.194
Percentage of ProvisionForLoanLossesExpensed-27.915.614.110.71.16.5

us-gaap:CommercialPortfolioSegment, stba:CommercialAndIndustrial


Provision
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value0.2252.7282.339-4.155606.1961.1932.397
Percentage of ProvisionForLoanLossesExpensed11.282.629.8-21.571.033.656.648.8

us-gaap:CommercialPortfolioSegment, us-gaap:CommercialRealEstate


Provision
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value2.9371.9964.30423207.639-0.4251.292
Percentage of ProvisionForLoanLossesExpensed146.360.554.8123.524.141.4-20.226.3

us-gaap:CommercialPortfolioSegment, us-gaap:ConstructionLoans


Provision
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-0.426-0.9110.274-1.6172.2492.3090.430.62
Percentage of ProvisionForLoanLossesExpensed-21.2-27.63.5-8.42.612.520.412.6

us-gaap:ConsumerPortfolioSegment, stba:ConsumerRealEstate


Provision
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-0.41-0.844-0.4-0.7970.40.4720.4990.065
Percentage of ProvisionForLoanLossesExpensed-20.4-25.6-5.1-4.10.52.623.71.3

us-gaap:ConsumerPortfolioSegment, stba:OtherConsumer


Provision
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value0.243-0.1820.234-0.040.6770.620.4090.539
Percentage of ProvisionForLoanLossesExpensed12.1-5.53.0-0.20.83.419.411.0

us-gaap:ProvisionForLoanLossesExpensed us-gaap:LienCategory

us-gaap:SeniorLien


Provision
Period End2020-09-30
Value3.4
Percentage of ProvisionForLoanLossesExpensed17.6

us-gaap:ProvisionForLoanLossesExpensed us-gaap:UnusualOrInfrequentItem

stba:COVID19


Provision
Period End2021-06-302021-03-31
Value2.63.1
Percentage of ProvisionForLoanLossesExpensed129.593.9

us-gaap:ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Reclassification
Period End2020-09-302020-06-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value0-142000.0000000-987000.003617000.0370000.00000
Percentage of ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent0.0100.00.00.00.00.00.00.0100.00.0100.0100.00.00.00.00.0

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Reclassification
Period End2020-09-302020-06-302020-03-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value0-112000.00000000-641000.002347000.0240000.00000
Percentage of ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent0.0100.00.00.00.00.00.00.00.0100.00.0100.0100.00.00.00.00.0

us-gaap:ReclassificationFromAociCurrentPeriodTax us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAociCurrentPeriodTax

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Reclassification
Period End2020-09-302020-06-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value0-30000.0000000-346000.001270000.0130000.00000
Percentage of ReclassificationFromAociCurrentPeriodTax0.0100.00.00.00.00.00.00.0100.00.0100.0100.00.00.00.00.0

us-gaap:RepaymentsOfOtherShortTermDebt

us-gaap:RepaymentsOfOtherShortTermDebt


Repayments
Period End2020-09-302019-09-30
Value1.541-75.0
Percentage of RepaymentsOfOtherShortTermDebt100.0100.0

us-gaap:ResultsOfOperationsIncomeBeforeIncomeTaxes

us-gaap:ResultsOfOperationsIncomeBeforeIncomeTaxes


Results
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value2920-44.865152731312731332532313131242427222224252417181919171516181411159.9834.3351618187.809
Percentage of ResultsOfOperationsIncomeBeforeIncomeTaxes100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability


Right
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.00.00.00.091101.6561.57735
Percentage of RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability0.00.00.0100.0100.0100.0100.0100.0

us-gaap:SeveranceCosts1 us-gaap:BusinessAcquisition

us-gaap:SeveranceCosts1

stba:DNBFinancialCorporation


Severance
Period End2020-12-312020-09-302020-06-302020-03-31
Value0001400000.0
Percentage of SeveranceCosts10.00.00.0100.0

us-gaap:StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures

us-gaap:RetainedEarnings


Stock
Period End2020-09-30
Value-366000.0
Percentage of StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures100.0

us-gaap:TreasuryStock


Stock
Period End2020-09-30
Value366000.0
Percentage of StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures-100.0

us-gaap:StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures

us-gaap:StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-167000.0-135000.00-31000.0-563000.0-24000.0-15000.0-876000.00-1000.01000.0-657000.0-1000.01000.0-495000.0-194000.001000.0-116000.00-71000.00-32000.0-79000.00-3000.01000.0-161000.0-2000.00-86000.00-1000.086000.0465000.0448000.0
Percentage of StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures100.0100.00.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.0100.00.0100.0100.00.0100.0100.0100.0100.00.0100.00.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-2624000.0730000.0366000.0-4453000.053000.06000.0-2360000.0481000.028000.092000.0-263000.0-1229000.0200000.030000.0-399000.0-2014000.0092000.0-546000.0-2491000.0-36000.029000.0-456000.0-1963000.0019000.0-2181000.0357000.013000.00-502000.0206000.038000.0-49000.0-796000.0-1465000.0
Percentage of StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures1571.3-540.70.014364.5-9.4-25.015733.3-54.90.0-9200.0-26300.0187.1-20000.03000.080.61038.10.09200.0470.70.050.70.01425.02484.80.0-633.3-218100.0-221.7-650.00.0583.70.0-3800.0-57.0-171.2-327.0

us-gaap:TreasuryStock


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value2457000.0-865000.0-366000.04422000.0-616000.0-30000.02345000.0-1357000.0-28000.0-93000.0264000.0572000.0-201000.0-29000.0-96000.01820000.00-91000.0430000.02491000.0-35000.0-29000.0424000.01884000.00-22000.02182000.0-518000.0-15000.00416000.0-206000.0-39000.0135000.01261000.01913000.0
Percentage of StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures-1471.3640.70.0-14264.5109.4125.0-15633.3154.90.09300.026400.0-87.120100.0-2900.019.4-938.10.0-9100.0-370.70.049.30.0-1325.0-2384.80.0733.3218200.0321.7750.00.0-483.70.03900.0157.0271.2427.0

us-gaap:TaxesOther

us-gaap:TaxesOther


Taxes
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value924000.01436000.01806000.01612000.01604000.01600000.0-818000.01540000.01456000.01185000.01255000.01341000.01739000.01848000.01241000.01208000.01083000.0976000.0974000.01080000.0896000.01100000.0895000.0719000.01159000.0842000.0542000.0839000.0893000.0631000.0790000.01039000.0915000.0999000.0667000.0982000.0777000.0774000.0712000.0864000.0903000.0902000.0806000.0739000.0942000.0
Percentage of TaxesOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TransferOfPortfolioLoansAndLeasesToHeldForSale1

us-gaap:TransferOfPortfolioLoansAndLeasesToHeldForSale1


Transfer
Period End2021-06-302021-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312015-09-302014-12-312014-09-302013-12-312013-09-30
Value0.02.798-0.0640.520.00.0-7.6953.7731.8622.06-43.15125170.0-1.29230.0-1.30.05.1580.0
Percentage of TransferOfPortfolioLoansAndLeasesToHeldForSale10.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.0100.00.0100.00.0

us-gaap:TransferToOtherRealEstate

us-gaap:TransferToOtherRealEstate


Transfer
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value13000.077000.00118000.0403000.0110000.02100000.0277000.0135000.080000.0223000.0-2194000.0242000.02599000.0122000.0709000.01010000.0397000.0458000.0350000.0182000.049000.0215000.0491000.0137000.00156000.0156000.088000.0186000.0745000.0313000.054000.0126000.01051000.0
Percentage of TransferToOtherRealEstate100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TreasuryStockAcquiredAverageCostPerShare us-gaap:ShareRepurchaseProgram

us-gaap:TreasuryStockAcquiredAverageCostPerShare

stba:NewShareRepurchasePlan


Treasury
Period End2020-12-31
Value0
Percentage of TreasuryStockAcquiredAverageCostPerShare0.0

us-gaap:TreasuryStockValueAcquiredCostMethod

us-gaap:TreasuryStockValueAcquiredCostMethod


Treasury
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.00.00.0120.03.12.83512
Percentage of TreasuryStockValueAcquiredCostMethod0.00.00.0100.00.0100.0100.0100.0

us-gaap:TreasuryStockValueAcquiredCostMethod us-gaap:ShareRepurchaseProgram

stba:NewShareRepurchasePlan


Treasury
Period End2020-12-312020-09-302020-06-302020-03-31
Value0.00.00.012
Percentage of TreasuryStockValueAcquiredCostMethod0.00.00.0100.3

us-gaap:TreasuryStockValueAcquiredCostMethod us-gaap:StatementEquityComponents

us-gaap:TreasuryStock


Treasury
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.00.00.0120.03.12.83512
Percentage of TreasuryStockValueAcquiredCostMethod0.00.00.0100.00.0100.0100.099.9

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-30
Value90590.099922.020656.00108120.079502.052850.0128260.0220120.0264420.0242440.0208870.0181570.0222010.081018.089853.078498.032985.028283.028873.021195.016894.037253.027535.023858.052953.032644.019547.015119.022462.015680.0
Percentage of WeightedAverageNumberDilutedSharesOutstandingAdjustment100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

stba:AccumulatedOtherComprehensiveIncomeLossDebtSecuritiesAvailableForSaleGrossUnrealizedGainAdjustmentNetOfTax

stba:AccumulatedOtherComprehensiveIncomeLossDebtSecuritiesAvailableForSaleGrossUnrealizedGainAdjustmentNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value2020262728259.173109.2964.6912.7681.5442.2512.4183.663
Percentage of AccumulatedOtherComprehensiveIncomeLossDebtSecuritiesAvailableForSaleGrossUnrealizedGainAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

stba:AccumulatedOtherComprehensiveIncomeLossDebtSecuritiesAvailableForSaleGrossUnrealizedGainAdjustmentTaxExpenseBenefit

stba:AccumulatedOtherComprehensiveIncomeLossDebtSecuritiesAvailableForSaleGrossUnrealizedGainAdjustmentTaxExpenseBenefit


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value5424000.05668000.07128000.07548000.07736000.06873000.02486000.02967000.02520000.01271000.0746000.0416000.0607000.0652000.01982000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossDebtSecuritiesAvailableForSaleGrossUnrealizedGainAdjustmentTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

stba:AccumulatedOtherComprehensiveIncomeLossDebtSecuritiesAvailableForSaleGrossUnrealizedLossAdjustmentTaxExpenseBenefit

stba:AccumulatedOtherComprehensiveIncomeLossDebtSecuritiesAvailableForSaleGrossUnrealizedLossAdjustmentTaxExpenseBenefit


Accumulated
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value-318000.0-615000.0-19000.00-2000.0-203000.0-66000.0-120000.0-784000.0-1832000.0-3307000.0-2750000.0-2308000.0-1393000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossDebtSecuritiesAvailableForSaleGrossUnrealizedLossAdjustmentTaxExpenseBenefit100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

stba:AccumulatedOtherComprehensiveIncomeLossDebtSecuritiesAvailableForSaleGrossUnrealizedLossesAdjustmentNetOfTax

stba:AccumulatedOtherComprehensiveIncomeLossDebtSecuritiesAvailableForSaleGrossUnrealizedLossesAdjustmentNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value1.1772.2730.0710.0010.0010.0090.750.2450.4442.8946.79612108.5592.574
Percentage of AccumulatedOtherComprehensiveIncomeLossDebtSecuritiesAvailableForSaleGrossUnrealizedLossesAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

stba:AccumulatedOtherComprehensiveIncomeLossDebtSecuritiesAvailableforsaleAdjustmentTaxExpenseBenefit

stba:AccumulatedOtherComprehensiveIncomeLossDebtSecuritiesAvailableforsaleAdjustmentTaxExpenseBenefit


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value5107000.05053000.07109000.07548000.07736000.06871000.02283000.02901000.02400000.0487000.0-1086000.0-2891000.0-2143000.0-1656000.0589000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossDebtSecuritiesAvailableforsaleAdjustmentTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

stba:AggregateBorrowingInFederalHomeLoanBank us-gaap:CreditFacility

stba:AggregateBorrowingInFederalHomeLoanBank

us-gaap:FederalHomeLoanBankAdvances


Aggregate
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value130132458532437363304540581646572587698659624675580565471472
Percentage of AggregateBorrowingInFederalHomeLoanBank100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

stba:AssetsHeldinTrustFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

stba:AssetsHeldinTrustFairValueDisclosure

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value7808000.07178000.06794000.05990000.05489000.04782000.05987000.05611000.05532000.05343000.04725000.0
Percentage of AssetsHeldinTrustFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

stba:AssetsHeldinTrustFairValueDisclosure us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value7808000.07178000.06794000.05990000.05489000.04782000.05987000.05611000.05532000.05343000.04725000.0
Percentage of AssetsHeldinTrustFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

stba:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedInterestPayableAndOtherLiabilities us-gaap:BusinessAcquisition

stba:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedInterestPayableAndOtherLiabilities

stba:DNBFinancialCorporation


Business
Period End2020-11-302020-09-302020-06-302020-03-312019-11-30
Value7.8517.8517.9057.9057.973
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedInterestPayableAndOtherLiabilities100.0100.0100.0100.0100.0

stba:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsLiabilities us-gaap:BusinessAcquisition

stba:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsLiabilities

stba:DNBFinancialCorporation


Business
Period End2020-11-302020-09-302020-06-302020-03-312019-11-30
Value-970000.0-970000.0-970000.0-970000.0-1281000.0
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsLiabilities100.0100.0100.0100.0100.0

stba:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssetsAcquired us-gaap:BusinessAcquisition

stba:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssetsAcquired

stba:DNBFinancialCorporation


Business
Period End2020-11-302020-09-302020-06-302020-03-312019-11-30
Value11181118111811181120
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssetsAcquired100.0100.0100.0100.0100.0

stba:BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDeposits us-gaap:BusinessAcquisition

stba:BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDeposits

stba:DNBFinancialCorporation


Business
Period End2020-11-302020-09-302020-06-302020-03-312019-11-30
Value967967967967967
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDeposits100.0100.0100.0100.0100.0

stba:BusinessCombinationRecognizedIdentifiableTangibleAssetsAcquiredAndLiabilitiesAssumedNet us-gaap:BusinessAcquisition

stba:BusinessCombinationRecognizedIdentifiableTangibleAssetsAcquiredAndLiabilitiesAssumedNet

stba:DNBFinancialCorporation


Business
Period End2020-11-302020-09-302020-06-302020-03-312019-11-30
Value105105106105107
Percentage of BusinessCombinationRecognizedIdentifiableTangibleAssetsAcquiredAndLiabilitiesAssumedNet100.0100.0100.0100.0100.0

stba:CombinedPercentageOfCommercialRealEstateAndCommercialConstructionInCommercialLoans us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

stba:CombinedPercentageOfCommercialRealEstateAndCommercialConstructionInCommercialLoans

us-gaap:CommercialPortfolioSegment, stba:CommercialRealEstateAndCommercialConstruction


Combined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value67.766.066.064.80.640.6830.690.6660.670.680.680.680.680.690.680.680.690.680.680.680.670.67
Percentage of CombinedPercentageOfCommercialRealEstateAndCommercialConstructionInCommercialLoans100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

stba:CombinedPercentageOfCommercialRealEstateAndCommercialConstructionInPortfolioLoans us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

stba:CombinedPercentageOfCommercialRealEstateAndCommercialConstructionInPortfolioLoans

us-gaap:CommercialPortfolioSegment, stba:CommercialRealEstateAndCommercialConstruction


Combined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value53.252.151.050.90.5040.530.530.5220.530.530.530.540.530.540.530.540.540.530.530.520.520.51
Percentage of CombinedPercentageOfCommercialRealEstateAndCommercialConstructionInPortfolioLoans100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

stba:CommitmentToLendAdditionalFunds

stba:CommitmentToLendAdditionalFunds


Commitment
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312018-12-31
Value0.70.80.81.74.611
Percentage of CommitmentToLendAdditionalFunds100.0100.0100.0100.0100.0100.0

stba:DebtSecuritiesAvailableforsaleandEquitySecuritiesFVNI

stba:DebtSecuritiesAvailableforsaleandEquitySecuritiesFVNI


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value840817773718804799784669668680684682688687698
Percentage of DebtSecuritiesAvailableforsaleandEquitySecuritiesFVNI100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

stba:DebtSecuritiesAvailableforsaleandEquitySecuritiesFVNI us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

us-gaap:FairValueInputsLevel1, us-gaap:EstimateOfFairValueFairValueDisclosure


Debt
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value753.2283.1852.6023.5045.0780.00.00.00.00.00.00.00.0
Percentage of DebtSecuritiesAvailableforsaleandEquitySecuritiesFVNI9.00.40.40.30.40.60.00.00.00.00.00.00.00.0

us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value764817770714801779669668680684682688687698
Percentage of DebtSecuritiesAvailableforsaleandEquitySecuritiesFVNI91.0100.099.699.699.799.4100.0100.0100.0100.0100.0100.0100.0100.0

stba:DebtSecuritiesAvailableforsaleandEquitySecuritiesFVNI us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value840817773718804799784669668680684682688687698
Percentage of DebtSecuritiesAvailableforsaleandEquitySecuritiesFVNI100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EstimateOfFairValueFairValueDisclosure


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value840817773718804799784669668680684682688687698
Percentage of DebtSecuritiesAvailableforsaleandEquitySecuritiesFVNI100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

stba:DeferredTaxAssetsOperatingLeaseLiability

stba:DeferredTaxAssetsOperatingLeaseLiability


Deferred
Period End2020-12-312019-12-31
Value1111
Percentage of DeferredTaxAssetsOperatingLeaseLiability100.0100.0

stba:DeferredTaxLiabilitiesPurchaseAccountingAdjustments

stba:DeferredTaxLiabilitiesPurchaseAccountingAdjustments


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value1971000.01269000.0100000.0100000.00
Percentage of DeferredTaxLiabilitiesPurchaseAccountingAdjustments100.0100.0100.0100.00.0

stba:DeferredTaxLiabilitiesUnrealizedGainsLossesForAvailableForSaleSecurities

stba:DeferredTaxLiabilitiesUnrealizedGainsLossesForAvailableForSaleSecurities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value7125000.02570000.00638000.02557000.03563000.03783000.00
Percentage of DeferredTaxLiabilitiesUnrealizedGainsLossesForAvailableForSaleSecurities100.0100.00.0100.0100.0100.0100.00.0

stba:FinancingReceivableAllowanceForCreditLossQuantitativeReserve us-gaap:FinancingReceivablePortfolioSegment, us-gaap:InternalCreditAssessment, us-gaap:UnusualOrInfrequentItem

stba:FinancingReceivableAllowanceForCreditLossQuantitativeReserve

us-gaap:CommercialPortfolioSegment, us-gaap:Criticized, stba:COVID19


Financing
Period End2020-12-312019-12-31
Value571290
Percentage of FinancingReceivableAllowanceForCreditLossQuantitativeReserve100.0100.0

stba:FinancingReceivableAllowanceForCreditLossSpecificReserve us-gaap:Collateral, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:UnusualOrInfrequentItem

stba:FinancingReceivableAllowanceForCreditLossSpecificReserve

srt:Hotel, us-gaap:CommercialPortfolioSegment, us-gaap:CommercialRealEstate, stba:COVID19


Financing
Period End2020-12-31
Value6.7
Percentage of FinancingReceivableAllowanceForCreditLossSpecificReserve100.0

stba:FinancingReceivableAllowanceForCreditLossSpecificReserve us-gaap:UnusualOrInfrequentItem

stba:COVID19


Financing
Period End2020-12-312019-12-31
Value132.2
Percentage of FinancingReceivableAllowanceForCreditLossSpecificReserve201.50.0

stba:FinancingReceivableBeforeAllowanceForCreditLossAndHeldForSaleNotPartOfADisposalGroup

stba:FinancingReceivableBeforeAllowanceForCreditLossAndHeldForSaleNotPartOfADisposalGroup


Financing
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value70147195724474117142
Percentage of FinancingReceivableBeforeAllowanceForCreditLossAndHeldForSaleNotPartOfADisposalGroup100.0100.0100.0100.0100.0

stba:FinancingReceivableNonaccrualHeldForSale us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

stba:FinancingReceivableNonaccrualHeldForSale

us-gaap:CommercialPortfolioSegment, stba:CommercialAndIndustrial


Financing
Period End2021-03-31
Value2800000.0
Percentage of FinancingReceivableNonaccrualHeldForSale100.0

stba:FinancingReceivableNonaccrualIncludingHeldForSale

stba:FinancingReceivableNonaccrualIncludingHeldForSale


Financing
Period End2021-03-31
Value135
Percentage of FinancingReceivableNonaccrualIncludingHeldForSale100.0

stba:FinancingReceivableRecordedInvestmentNonPerforming

stba:FinancingReceivableRecordedInvestmentNonPerforming


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value91102117655837453535403413131212192635312527423515108.218128.5739.698112236374654666956
Percentage of FinancingReceivableRecordedInvestmentNonPerforming100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

stba:FinancingReceivableRecordedInvestmentNonaccrualTroubleDebtRestructured

stba:FinancingReceivableRecordedInvestmentNonaccrualTroubleDebtRestructured


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value2029291831368.912147.873117.1437.3958.56111010101115159.2917.6598.0928.9289.9165.4364.9295.2419.2691020161418232518
Percentage of FinancingReceivableRecordedInvestmentNonaccrualTroubleDebtRestructured100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

stba:FinancingReceivablesImpairedTroubledDebtRestructuringAfterWriteDown us-gaap:FinancialInstrumentPerformanceStatus, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

stba:FinancingReceivablesImpairedTroubledDebtRestructuringAfterWriteDown

stba:PerformingFinancialInstrumentConvertedToNonperforming, us-gaap:CommercialPortfolioSegment, stba:CommercialAndIndustrial


Financing
Period End2020-12-31
Value9.6
Percentage of FinancingReceivablesImpairedTroubledDebtRestructuringAfterWriteDown100.0

stba:PerformingFinancialInstrumentConvertedToNonperforming, us-gaap:CommercialPortfolioSegment, us-gaap:CommercialRealEstate


Financing
Period End2020-09-30
Value11
Percentage of FinancingReceivablesImpairedTroubledDebtRestructuringAfterWriteDown0.0

stba:InterestReceivableDebtSecuritiesAvailableForSale

stba:InterestReceivableDebtSecuritiesAvailableForSale


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value3200000.03200000.03400000.03000000.03400000.03500000.03400000.0
Percentage of InterestReceivableDebtSecuritiesAvailableForSale100.0100.0100.0100.0100.0100.0100.0

stba:InvestmentsInNonBankSubsidiary us-gaap:ConsolidatedEntities

stba:InvestmentsInNonBankSubsidiary

srt:ParentCompany


Investments
Period End2020-12-312019-12-312018-12-312017-12-31
Value10161519
Percentage of InvestmentsInNonBankSubsidiary100.0100.0100.0100.0

stba:LesseeOperatingAndFinanceLeaseLiabilityPaymentsDue

stba:LesseeOperatingAndFinanceLeaseLiabilityPaymentsDue


Lessee
Period End2020-12-31
Value92
Percentage of LesseeOperatingAndFinanceLeaseLiabilityPaymentsDue100.0

stba:LesseeOperatingAndFinanceLeaseLiabilityPaymentsDueAfterYearFive

stba:LesseeOperatingAndFinanceLeaseLiabilityPaymentsDueAfterYearFive


Lessee
Period End2020-12-31
Value67
Percentage of LesseeOperatingAndFinanceLeaseLiabilityPaymentsDueAfterYearFive100.0

stba:LesseeOperatingAndFinanceLeaseLiabilityPaymentsDueNextTwelveMonths

stba:LesseeOperatingAndFinanceLeaseLiabilityPaymentsDueNextTwelveMonths


Lessee
Period End2020-12-31
Value5058000.0
Percentage of LesseeOperatingAndFinanceLeaseLiabilityPaymentsDueNextTwelveMonths100.0

stba:LesseeOperatingAndFinanceLeaseLiabilityPaymentsDueYearFive

stba:LesseeOperatingAndFinanceLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2020-12-31
Value4919000.0
Percentage of LesseeOperatingAndFinanceLeaseLiabilityPaymentsDueYearFive100.0

stba:LesseeOperatingAndFinanceLeaseLiabilityPaymentsDueYearFour

stba:LesseeOperatingAndFinanceLeaseLiabilityPaymentsDueYearFour


Lessee
Period End2020-12-31
Value4882000.0
Percentage of LesseeOperatingAndFinanceLeaseLiabilityPaymentsDueYearFour100.0

stba:LesseeOperatingAndFinanceLeaseLiabilityPaymentsDueYearThree

stba:LesseeOperatingAndFinanceLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2020-12-31
Value4888000.0
Percentage of LesseeOperatingAndFinanceLeaseLiabilityPaymentsDueYearThree100.0

stba:LesseeOperatingAndFinanceLeaseLiabilityPaymentsDueYearTwo

stba:LesseeOperatingAndFinanceLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2020-12-31
Value5080000.0
Percentage of LesseeOperatingAndFinanceLeaseLiabilityPaymentsDueYearTwo100.0

stba:LesseeOperatingAndFinanceLeaseLiabilityUndiscountedExcessAmount

stba:LesseeOperatingAndFinanceLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2020-12-31
Value39
Percentage of LesseeOperatingAndFinanceLeaseLiabilityUndiscountedExcessAmount100.0

stba:LoansReceivableMeasurementInput us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:MeasurementInputType, us-gaap:ValuationTechnique

stba:LoansReceivableMeasurementInput

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsNonrecurring, us-gaap:MeasurementInputDiscountRate, us-gaap:ValuationTechniqueDiscountedCashFlow


Loans
Period End2020-09-302020-06-30
Value3.250.0325
Percentage of LoansReceivableMeasurementInput100.0100.0

stba:LoansReceivableMeasurementInput us-gaap:Range, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:MeasurementInputType, us-gaap:ValuationTechnique

srt:Maximum, us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsNonrecurring, us-gaap:MeasurementInputAppraisedValue, stba:ValuationTechniqueCollateralMethod


Loans
Period End2021-06-302021-03-312020-12-312019-12-31
Value32.047.047.020.0
Percentage of LoansReceivableMeasurementInput0.00.00.00.0

srt:Maximum, us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsNonrecurring, us-gaap:MeasurementInputCostToSell, stba:ValuationTechniqueCollateralMethod


Loans
Period End2020-09-302020-06-302020-03-312019-12-31
Value22.00.170.170.2
Percentage of LoansReceivableMeasurementInput676.9523.10.00.0

srt:WeightedAverage, us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsNonrecurring, us-gaap:MeasurementInputAppraisedValue, stba:ValuationTechniqueCollateralMethod


Loans
Period End2021-06-302021-03-312020-12-312019-12-31
Value13.6816.9116.98.55
Percentage of LoansReceivableMeasurementInput0.00.00.00.0

srt:WeightedAverage, us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsNonrecurring, us-gaap:MeasurementInputCostToSell, stba:ValuationTechniqueCollateralMethod


Loans
Period End2020-09-302020-06-302019-12-31
Value7.470.06810.0855
Percentage of LoansReceivableMeasurementInput229.8209.50.0

srt:WeightedAverage, us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsNonrecurring, us-gaap:MeasurementInputDiscountRate, us-gaap:ValuationTechniqueDiscountedCashFlow


Loans
Period End2020-09-302020-06-302019-12-31
Value3.250.03250.0528
Percentage of LoansReceivableMeasurementInput100.0100.00.0

stba:LongTermDebtAverageInterestRateAfterYearFive

stba:LongTermDebtAverageInterestRateAfterYearFive


Long
Period End2020-12-31
Value6.02
Percentage of LongTermDebtAverageInterestRateAfterYearFive100.0

stba:LongTermDebtAverageInterestRateInYearFive

stba:LongTermDebtAverageInterestRateInYearFive


Long
Period End2020-12-31
Value5.82
Percentage of LongTermDebtAverageInterestRateInYearFive100.0

stba:LongTermDebtAverageInterestRateInYearFour

stba:LongTermDebtAverageInterestRateInYearFour


Long
Period End2020-12-31
Value1.35
Percentage of LongTermDebtAverageInterestRateInYearFour100.0

stba:LongTermDebtAverageInterestRateInYearThree

stba:LongTermDebtAverageInterestRateInYearThree


Long
Period End2020-12-31
Value5.72
Percentage of LongTermDebtAverageInterestRateInYearThree100.0

stba:LongTermDebtAverageInterestRateInYearTwo

stba:LongTermDebtAverageInterestRateInYearTwo


Long
Period End2020-12-31
Value2.27
Percentage of LongTermDebtAverageInterestRateInYearTwo100.0

stba:LongtermDebtAverageInterestRate

stba:LongtermDebtAverageInterestRate


Longterm
Period End2020-12-31
Value2.03
Percentage of LongtermDebtAverageInterestRate100.0

stba:LongtermDebtAverageInterestRateInNextTwelveMonths

stba:LongtermDebtAverageInterestRateInNextTwelveMonths


Longterm
Period End2020-12-31
Value3.67
Percentage of LongtermDebtAverageInterestRateInNextTwelveMonths100.0

stba:NetLoansOutOfStatePercentageExcludingContiguousStates us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

stba:NetLoansOutOfStatePercentageExcludingContiguousStates

us-gaap:CommercialPortfolioSegment, stba:CommercialRealEstateAndCommercialConstruction


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-31
Value2.93.03.03.10.030.0280.0290.0340.0340.030.0290.0290.0280.0270.0280.0270.0280.0280.0270.0280.03
Percentage of NetLoansOutOfStatePercentageExcludingContiguousStates100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

stba:NetNonperformingAssets

stba:NetNonperformingAssets


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value1131341488692775751465049232424243038464341435235241919121315212236384655677260
Percentage of NetNonperformingAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

stba:OperatingAndFinanceLeaseLiability

stba:OperatingAndFinanceLeaseLiability


Operating
Period End2020-12-31
Value53
Percentage of OperatingAndFinanceLeaseLiability100.0

stba:OtherRealEstateOwnedFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:ValuationTechnique

stba:OtherRealEstateOwnedFairValueDisclosure

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsNonrecurring, stba:ValuationTechniqueCollateralMethod


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value1088000.01563000.01953000.02098000.02413000.03045000.03231000.0
Percentage of OtherRealEstateOwnedFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0

stba:OutOfStateExposureOfCombinedPortfolio us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

stba:OutOfStateExposureOfCombinedPortfolio

us-gaap:CommercialPortfolioSegment, stba:CommercialRealEstateAndCommercialConstruction


Out
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-31
Value5.45.75.96.00.0570.0540.0540.0640.0640.0570.0540.0550.0530.050.0520.0510.0530.0520.0520.0540.058
Percentage of OutOfStateExposureOfCombinedPortfolio100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

stba:PercentageOfCommercialLoansInPortfolioLoans us-gaap:FinancingReceivablePortfolioSegment

stba:PercentageOfCommercialLoansInPortfolioLoans

us-gaap:CommercialPortfolioSegment


Percentage
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-31
Value78.579.079.078.60.7880.7760.770.7850.7850.790.790.790.790.780.780.780.780.780.770.770.76
Percentage of PercentageOfCommercialLoansInPortfolioLoans100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

stba:PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesAmortizedCost us-gaap:FinancialInstrument

stba:PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesAmortizedCost

us-gaap:MortgageBackedSecurities


Pledged
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value654292662214162824525157
Percentage of PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesAmortizedCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

stba:PortfolioLoansFairValueDisclosure

stba:PortfolioLoansFairValueDisclosure


Portfolio
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value718509473441407361325327329332318
Percentage of PortfolioLoansFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

stba:SubordinatedBorrowingsAllowableinComputationofNetCapital1

stba:SubordinatedBorrowingsAllowableinComputationofNetCapital1


Subordinated
Period End2020-12-31
Value32
Percentage of SubordinatedBorrowingsAllowableinComputationofNetCapital1100.0

us-gaap:AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value1818262728258.423108.8521.797-4.028-10.722-7.9491.9514.8554.955.5634.7251415126.6189.8366.471107.0274.445.7612.3-0.61.61.49.210119.79.7
Percentage of AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllowanceForNotesAndLoansReceivableCurrent us-gaap:UnusualOrInfrequentItem

us-gaap:AllowanceForNotesAndLoansReceivableCurrent

stba:COVID19


Allowance
Period End2020-12-31
Value2300000.0
Percentage of AllowanceForNotesAndLoansReceivableCurrent100.0

us-gaap:AmortizationMethodQualifiedAffordableHousingProjectInvestments

us-gaap:AmortizationMethodQualifiedAffordableHousingProjectInvestments


Amortization
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value8.48.97.46.44.85.04.65.66.36.77.38.09.010.010111112131415151618
Percentage of AmortizationMethodQualifiedAffordableHousingProjectInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:AssetsFairValueDisclosure

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value8310109.1758.0918.286115.6115.5325.3434.7255.3774.9885.0485.085.0394.794.6744.414.3124.1964.0694.0213.693.7963.5053.6343.4653.2963.1213.0662.7283.2513.1432.3632.824.1774.804
Percentage of AssetsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value813854848808898887805702691691690690694692701703695719700687701693672674678670653627602565523504495490476439391377
Percentage of AssetsFairValueDisclosure972.98132.48469.28810.311107.610705.97276.812521.312507.712942.014617.612837.513931.413720.113810.813955.514515.715384.015888.515935.116707.517031.916725.218288.717861.419121.817977.718118.018285.318110.817059.418484.915238.015591.320145.615596.39377.67848.9

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsNonrecurring


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-312012-09-302012-06-302011-12-31
Value68897453672743383234256.5338.2959.5377.38112232116121719121118191516171822263046545442
Percentage of AssetsFairValueDisclosure81.9848.4747.5584.4837.5336.7389.2682.8595.6642.0538.9121.5166.3188.9145.3250.2489.6466.1377.0288.4419.1489.6321.5307.6481.6544.9439.4472.8525.2578.6719.3977.4937.01978.41939.91307.0882.4

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring


Assets
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312013-03-312012-12-312012-09-302012-06-302011-12-31
Value1.1371.7352.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.3121.131.1051.3411.687
Percentage of AssetsFairValueDisclosure1.416.528.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.09.947.839.232.135.1

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value898866861817906895816708697696695695699697706708700723705691705697676678681673656631605568526506498493479443397383
Percentage of AssetsFairValueDisclosure1074.38248.98598.18910.311207.610805.97376.812621.312607.713042.014717.612937.514031.413820.113910.814055.514615.715484.015988.516035.116807.517131.916825.218388.717961.419221.818077.718218.018385.318210.817159.418584.915338.015701.220293.415735.59509.77984.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value2526333536321113115.9623.5141.962.8585.645
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax us-gaap:FinancialInstrument

us-gaap:CollateralizedMortgageObligations


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value4.7625.7166.417.5168.2248.792.7733.5033.0291.6080.7950.00.0610.093
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax18.721.519.121.222.627.223.825.225.627.022.60.02.11.6

us-gaap:CommercialMortgageBackedSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value1111141514122.683.9112.8070.2720.00.00.00.247
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax43.641.744.242.440.937.323.028.123.84.60.00.00.04.4

us-gaap:CorporateDebtSecurities


Available
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value0.0020.0050.0050.0120.030.0240.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax0.00.00.00.00.10.20.0

us-gaap:ResidentialMortgageBackedSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value0.5480.6320.8180.7740.8770.8020.3210.3450.2890.2290.2030.2190.3090.679
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax2.12.42.42.22.42.52.82.52.43.85.811.210.812.0

us-gaap:USGovernmentCorporationsAndAgenciesSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value2.953.3134.1494.5424.8355.0441.7731.9081.5320.3730.0680.00.0160.341
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax11.612.512.412.813.315.615.213.713.06.31.90.00.66.0

us-gaap:USStatesAndPoliticalSubdivisions


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value5.5695.5566.9887.2437.1255.1874.0174.1644.1163.482.4481.7412.4724.285
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax21.820.920.920.419.616.134.529.934.858.469.788.886.575.9

us-gaap:USTreasurySecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value0.5510.2590.3020.3460.380.40.0710.0830.0430.00.00.00.00.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax2.21.00.91.01.01.20.60.60.40.00.00.00.00.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value1.4952.8880.090.0010.0010.0110.9530.3110.5643.6788.62815123.967
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax us-gaap:FinancialInstrument

us-gaap:CollateralizedMortgageObligations


Available
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value0.871.1940.0890.00.00.3040.2520.3161.1661.9853.6232.951.321
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax58.241.398.90.00.031.981.056.031.723.023.322.833.3

us-gaap:CommercialMortgageBackedSecurities


Available
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value0.0390.1240.00.00.5810.0360.1721.9144.8768.4947.332.044
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax2.64.30.00.061.011.630.552.056.554.556.651.5

us-gaap:CorporateDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value0.0010.0010.0010.0010.00.0110.00.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax0.10.01.1100.00.0100.00.00.0

us-gaap:ResidentialMortgageBackedSecurities


Available
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value0.5851.2170.00.00.0230.0230.0570.1960.4170.6060.5290.213
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax39.142.10.00.02.47.410.15.34.83.94.15.4

us-gaap:USTreasurySecurities


Available
Period End2021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value0.3520.00.00.00.00.00.1240.2220.40.3340.154
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax12.20.00.00.00.00.03.42.62.62.63.9

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302012-09-302012-06-302011-12-31
Value815790737679765763768650652673685690693389344332
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis us-gaap:FinancialInstrument

us-gaap:CollateralizedMortgageObligations


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value197213202175172180186151147153149141121109
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis24.227.027.525.822.623.724.323.322.622.821.920.517.60.0

us-gaap:CommercialMortgageBackedSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value314266258265269272273234232239251253254244
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis38.533.735.139.035.235.735.636.035.635.536.736.636.70.0

us-gaap:CorporateDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value0.52.0012.0214.0235.0267.5327.6030.0
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis0.10.30.30.60.71.01.00.0

us-gaap:ResidentialMortgageBackedSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value6364661618202218202224262832
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis7.88.29.12.42.52.72.92.83.23.33.63.94.10.0

us-gaap:USGovernmentCorporationsAndAgenciesSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value78787888158132155128128129129139156162
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis9.610.010.713.120.817.420.319.719.619.218.920.222.60.0

us-gaap:USStatesAndPoliticalSubdivisions


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value86101117119130139112108113119119120121123
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis10.612.915.917.617.018.314.616.617.417.717.517.417.50.0

us-gaap:USTreasurySecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value74639.989.9779.9759.9729.9699.9669.9649.9619.9589.9569.95319
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis9.18.01.41.51.31.31.31.51.51.51.51.41.40.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost


Available
Period End2021-06-302021-03-312020-12-312020-09-30
Value95894138
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue


Available
Period End2021-06-302021-03-312020-12-312020-09-30
Value97914341
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost


Available
Period End2021-06-302021-03-312020-12-312020-09-30
Value8792103111
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue


Available
Period End2021-06-302021-03-312020-12-312020-09-30
Value9197109117
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost


Available
Period End2021-06-302021-03-312020-12-312020-09-30
Value21212126
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue


Available
Period End2021-06-302021-03-312020-12-312020-09-30
Value23232328
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate


Available
Period End2021-06-302021-03-312020-12-312020-09-30
Value248252217230
Percentage of AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis


Available
Period End2021-06-302021-03-312020-12-312020-09-30
Value239244206218
Percentage of AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost


Available
Period End2021-06-302021-03-312020-12-312020-09-30
Value35404041
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue


Available
Period End2021-06-302021-03-312020-12-312020-09-30
Value35404142
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost

us-gaap:CollateralizedMortgageObligations


Available
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
Value197213202175172180186151147153149141121
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommercialMortgageBackedSecurities


Available
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
Value314266258265269272273234232239251253254
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost159.1124.8127.5151.1155.9150.9146.5154.2157.5155.6167.9179.1209.2

us-gaap:CorporateBondSecurities


Available
Period End2021-06-302021-03-312020-09-302020-06-302020-03-31
Value0.52.0014.0235.0267.532
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost0.30.92.32.94.2

us-gaap:CorporateDebtSecurities


Available
Period End2020-12-31
Value2.021
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost1.0

us-gaap:ResidentialMortgageBackedSecurities


Available
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
Value63646616182022182022242628
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost32.430.233.09.410.911.311.812.214.014.616.419.023.6

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue

us-gaap:CollateralizedMortgageObligations


Available
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
Value201217209183181189189155150154148137118
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommercialMortgageBackedSecurities


Available
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
Value325277273280284284275237235237246244247
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue161.6127.2130.8153.1157.1150.2145.7153.5156.4154.1166.0177.7208.1

us-gaap:CorporateBondSecurities


Available
Period End2021-06-302021-03-312020-09-302020-06-302020-03-31
Value0.4992.0024.0275.0387.551
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue0.20.92.22.84.0

us-gaap:CorporateDebtSecurities


Available
Period End2020-12-31
Value2.025
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue1.0

us-gaap:ResidentialMortgageBackedSecurities


Available
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
Value63636717192122182022242628
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue31.729.332.49.510.911.211.812.113.914.616.419.224.0

us-gaap:AvailableForSaleSecuritiesDebtSecurities

us-gaap:AvailableForSaleSecuritiesDebtSecurities


Available
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312012-09-302012-06-302011-12-31
Value813770714801795779664664675680677682693406358345
Percentage of AvailableForSaleSecuritiesDebtSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value813770714801795779664664675680677682693
Percentage of AvailableForSaleSecuritiesDebtSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:CollateralizedMortgageObligations


Available
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value217209183181189189155150154148137118108
Percentage of AvailableForSaleSecuritiesDebtSecurities26.827.225.622.623.824.323.322.722.821.920.317.415.7

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:CommercialMortgageBackedSecurities


Available
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value277273280284284275237235237246244247242
Percentage of AvailableForSaleSecuritiesDebtSecurities34.135.539.235.535.835.435.835.435.136.336.136.234.9

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:CorporateBondSecurities


Available
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value2.0022.0254.0275.0387.5517.627
Percentage of AvailableForSaleSecuritiesDebtSecurities0.20.30.60.60.91.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:ResidentialMortgageBackedSecurities


Available
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value63671719212218202224262832
Percentage of AvailableForSaleSecuritiesDebtSecurities7.98.82.42.52.72.92.83.23.33.63.94.24.7

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:USGovernmentCorporationsAndAgenciesSecurities


Available
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value828293163137157130129129128136155162
Percentage of AvailableForSaleSecuritiesDebtSecurities10.110.813.120.417.320.219.619.519.118.920.222.723.4

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:USStatesAndPoliticalSubdivisions


Available
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value107124126137144116112117122122121123127
Percentage of AvailableForSaleSecuritiesDebtSecurities13.216.217.717.118.214.916.917.718.118.018.018.118.4

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:USTreasurySecurities


Available
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value63101010101010109.8379.7369.5569.61919
Percentage of AvailableForSaleSecuritiesDebtSecurities7.81.31.41.31.31.31.51.51.51.41.41.42.9

us-gaap:AvailableForSaleSecuritiesDebtSecurities us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value813770714801795779664664675680677682693
Percentage of AvailableForSaleSecuritiesDebtSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:FairValueMeasurementsRecurring, us-gaap:CollateralizedMortgageObligations


Available
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value217209183181189189155150154148137118108
Percentage of AvailableForSaleSecuritiesDebtSecurities26.827.225.622.623.824.323.322.722.821.920.317.415.7

us-gaap:FairValueMeasurementsRecurring, us-gaap:CommercialMortgageBackedSecurities


Available
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value277273280284284275237235237246244247242
Percentage of AvailableForSaleSecuritiesDebtSecurities34.135.539.235.535.835.435.835.435.136.336.136.234.9

us-gaap:FairValueMeasurementsRecurring, us-gaap:CorporateBondSecurities


Available
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value2.0022.0254.0275.0387.5517.627
Percentage of AvailableForSaleSecuritiesDebtSecurities0.20.30.60.60.91.0

us-gaap:FairValueMeasurementsRecurring, us-gaap:ResidentialMortgageBackedSecurities


Available
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value63671719212218202224262832
Percentage of AvailableForSaleSecuritiesDebtSecurities7.98.82.42.52.72.92.83.23.33.63.94.24.7

us-gaap:FairValueMeasurementsRecurring, us-gaap:USGovernmentCorporationsAndAgenciesSecurities


Available
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value828293163137157130129129128136155162
Percentage of AvailableForSaleSecuritiesDebtSecurities10.110.813.120.417.320.219.619.519.118.920.222.723.4

us-gaap:FairValueMeasurementsRecurring, us-gaap:USStatesAndPoliticalSubdivisions


Available
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value107124126137144116112117122122121123127
Percentage of AvailableForSaleSecuritiesDebtSecurities13.216.217.717.118.214.916.917.718.118.018.018.118.4

us-gaap:FairValueMeasurementsRecurring, us-gaap:USTreasurySecurities


Available
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value63101010101010109.8379.7369.5569.61919
Percentage of AvailableForSaleSecuritiesDebtSecurities7.81.31.41.31.31.31.51.51.51.41.41.42.9

us-gaap:AvailableForSaleSecuritiesDebtSecurities us-gaap:FinancialInstrument

us-gaap:CollateralizedMortgageObligations


Available
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value217209183181189189155150154148137118108
Percentage of AvailableForSaleSecuritiesDebtSecurities26.827.225.622.623.824.323.322.722.821.920.317.415.7

us-gaap:CommercialMortgageBackedSecurities


Available
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value277273280284284275237235237246244247242
Percentage of AvailableForSaleSecuritiesDebtSecurities34.135.539.235.535.835.435.835.435.136.336.136.234.9

us-gaap:CorporateDebtSecurities


Available
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value2.0022.0254.0275.0387.5517.6270.0
Percentage of AvailableForSaleSecuritiesDebtSecurities0.20.30.60.60.91.00.0

us-gaap:ResidentialMortgageBackedSecurities


Available
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value63671719212218202224262832
Percentage of AvailableForSaleSecuritiesDebtSecurities7.98.82.42.52.72.92.83.23.33.63.94.24.7

us-gaap:USGovernmentCorporationsAndAgenciesSecurities


Available
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value828293163137157130129129128136155162
Percentage of AvailableForSaleSecuritiesDebtSecurities10.110.813.120.417.320.219.619.519.118.920.222.723.4

us-gaap:USStatesAndPoliticalSubdivisions


Available
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value107124126137144116112117122122121123127
Percentage of AvailableForSaleSecuritiesDebtSecurities13.216.217.717.118.214.916.917.718.118.018.018.118.4

us-gaap:USTreasurySecurities


Available
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value63101010101010109.8379.7369.5569.61919
Percentage of AvailableForSaleSecuritiesDebtSecurities7.81.31.41.31.31.31.51.51.51.41.41.42.9

us-gaap:BankOwnedLifeInsurance

us-gaap:BankOwnedLifeInsurance


Bank
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value838282818180807574747373737272717272727170707079797862616160606059595858606056565554
Percentage of BankOwnedLifeInsurance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BusinessCombinationAcquiredReceivablesFairValue us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationAcquiredReceivablesFairValue

stba:DNBFinancialCorporation


Business
Period End2020-11-302020-09-302020-06-302020-03-312019-12-312019-11-30
Value906906906906899908
Percentage of BusinessCombinationAcquiredReceivablesFairValue100.0100.0100.0100.0100.0100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill

stba:DNBFinancialCorporation


Business
Period End2020-12-31
Value8.7
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill us-gaap:BusinessAcquisition, us-gaap:FiniteLivedIntangibleAssetsByMajorClass

stba:DNBFinancialCorporation, stba:WealthManagement


Business
Period End2020-12-312020-11-302020-09-302020-06-302020-03-312019-11-30
Value0.31.7721.7721.7721.7721.772
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill3.40.00.00.00.00.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities

stba:DNBFinancialCorporation


Business
Period End2020-11-302020-09-302020-06-302020-03-312019-11-30
Value10121012101210121012
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities100.0100.0100.0100.0100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt

stba:DNBFinancialCorporation


Business
Period End2020-11-302020-09-302020-06-302020-03-312019-11-30
Value3737373737
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt100.0100.0100.0100.0100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets

stba:DNBFinancialCorporation


Business
Period End2020-11-302020-09-302020-06-302020-03-312019-11-30
Value2020202020
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets100.0100.0100.0100.0100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet

stba:DNBFinancialCorporation


Business
Period End2020-11-302020-09-302020-06-302020-03-312019-11-30
Value115115115115116
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet100.0100.0100.0100.0100.0

us-gaap:Capital us-gaap:CreditFacility

us-gaap:Capital

stba:SAndTBank


Capitalus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value922922659666622577475457452429
Percentage of Capital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

stba:SavingsAndTrust


Capitalus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value944954669713664611537494504465
Percentage of Capital102.5103.4101.6107.0106.7105.9113.1108.2111.3108.3

us-gaap:CapitalRequiredForCapitalAdequacy us-gaap:CreditFacility

us-gaap:CapitalRequiredForCapitalAdequacy

stba:SAndTBank


Capital
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value561576264453446420300274252243
Percentage of CapitalRequiredForCapitalAdequacy100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

stba:SavingsAndTrust


Capital
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value562577264454448421301275262245
Percentage of CapitalRequiredForCapitalAdequacy100.2100.2100.3100.3100.3100.4100.5100.5103.8100.6

us-gaap:CapitalRequiredForCapitalAdequacyToRiskWeightedAssets us-gaap:CreditFacility

us-gaap:CapitalRequiredForCapitalAdequacyToRiskWeightedAssets

stba:SAndTBank


Capital
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value8.00.080.0450.080.080.080.080.080.080.08
Percentage of CapitalRequiredForCapitalAdequacyToRiskWeightedAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

stba:SavingsAndTrust


Capital
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value8.00.080.0450.080.080.080.080.080.080.08
Percentage of CapitalRequiredForCapitalAdequacyToRiskWeightedAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalRequiredToBeWellCapitalized us-gaap:CreditFacility

us-gaap:CapitalRequiredToBeWellCapitalized

stba:SAndTBank


Capital
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value701720381566558525375342315304
Percentage of CapitalRequiredToBeWellCapitalized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

stba:SavingsAndTrust


Capital
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value702721382568560527376344327306
Percentage of CapitalRequiredToBeWellCapitalized100.2100.2100.3100.3100.3100.4100.5100.5103.8100.6

us-gaap:CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets us-gaap:CreditFacility

us-gaap:CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets

stba:SAndTBank