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  <xs:element id="fcf_ConstructionOtherMember" abstract="true" name="ConstructionOtherMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_ConstructionResidentialMember" abstract="true" name="ConstructionResidentialMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_NonownerOccupiedCommercialRealEstateMember" abstract="true" name="NonownerOccupiedCommercialRealEstateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_OwnerOccupiedCommercialRealEstateMember" abstract="true" name="OwnerOccupiedCommercialRealEstateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_ScheduleOfPCDLoansPurchasedInBusinessAcquisitionLineItems" abstract="true" name="ScheduleOfPCDLoansPurchasedInBusinessAcquisitionLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="fcf_ScheduleOfNonPCDLoansPurchasedInBusinessAcquisitionTable" abstract="true" name="ScheduleOfNonPCDLoansPurchasedInBusinessAcquisitionTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="fcf_EquipmentFinanceMember" abstract="true" name="EquipmentFinanceMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_TimeAndDemandLoansOtherMember" abstract="true" name="TimeAndDemandLoansOtherMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_OtherConsumerLoansMember" abstract="true" name="OtherConsumerLoansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_ScheduleOfNonPCDLoansPurchasedInBusinessAcquisitionLineItems" abstract="true" name="ScheduleOfNonPCDLoansPurchasedInBusinessAcquisitionLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="fcf_FinancingReceivablePurchasedWithoutCreditDeteriorationDiscountPremium" abstract="false" name="FinancingReceivablePurchasedWithoutCreditDeteriorationDiscountPremium" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fcf_FinancingReceivablePurchasedWithoutCreditDeteriorationAmountAtPurchasePrice" abstract="false" name="FinancingReceivablePurchasedWithoutCreditDeteriorationAmountAtPurchasePrice" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fcf_FinancingReceivablePurchasedWithoutCreditDeteriorationAmountAtParValue" abstract="false" name="FinancingReceivablePurchasedWithoutCreditDeteriorationAmountAtParValue" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fcf_BusinessCombinationLoansAcquiredAccountedAsPurchasedWithCreditDeteriorationPercentage" abstract="false" name="BusinessCombinationLoansAcquiredAccountedAsPurchasedWithCreditDeteriorationPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="fcf_CashPaidForInterestAndIncomeTaxesAbstract" abstract="true" name="CashPaidForInterestAndIncomeTaxesAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="fcf_UnsettledBankOwnedLifeInsuranceProceeds" abstract="false" name="UnsettledBankOwnedLifeInsuranceProceeds" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fcf_LoansTransferredtoOtherRealEstateOwnedandRepossessions" abstract="false" name="LoansTransferredtoOtherRealEstateOwnedandRepossessions" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fcf_DecreaseIncreaseInLimitedPartnershipInvestmentUnfundedCommitment" abstract="false" name="DecreaseIncreaseInLimitedPartnershipInvestmentUnfundedCommitment" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fcf_WeightedAverageNumberofSharesDeferredCompensationPlans" abstract="false" name="WeightedAverageNumberofSharesDeferredCompensationPlans" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="fcf_WeightedAverageNumberOfAdditionalSharesDeferredCompensationPlan" abstract="false" name="WeightedAverageNumberOfAdditionalSharesDeferredCompensationPlan" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="fcf_RestrictedStockUnitsMember" abstract="true" name="RestrictedStockUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_CommercialLettersOfCreditMember" abstract="true" name="CommercialLettersOfCreditMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_NotionalAmountOfCommitmentsAndLettersOfCredit" abstract="false" name="NotionalAmountOfCommitmentsAndLettersOfCredit" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fcf_NotionalAmountOfPerformanceStandbyLettersOfCredit" abstract="false" name="NotionalAmountOfPerformanceStandbyLettersOfCredit" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fcf_NotionalAmountOfCommercialLettersOfCredit" abstract="false" name="NotionalAmountOfCommercialLettersOfCredit" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fcf_NotionalAmountOfFinancialStandbyLettersOfCredit" abstract="false" name="NotionalAmountOfFinancialStandbyLettersOfCredit" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fcf_InvestmentSecuritiesTable" abstract="true" name="InvestmentSecuritiesTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="fcf_USGovernmentAgencyDebtSecuritiesResidentialDomain" abstract="true" name="USGovernmentAgencyDebtSecuritiesResidentialDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_USGovernmentAgencyDebtSecuritiesCommercialMember" abstract="true" name="USGovernmentAgencyDebtSecuritiesCommercialMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_InvestmentSecuritiesLineItems" abstract="true" name="InvestmentSecuritiesLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="fcf_SourceOfRealizedGainsLossesAxis" abstract="true" name="SourceOfRealizedGainsLossesAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="fcf_SourceOfRealizedGainsLossesDomain" abstract="true" name="SourceOfRealizedGainsLossesDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_MaturitiesMember" abstract="true" name="MaturitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_GrossGains" abstract="false" name="GrossGains" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fcf_GrossLosses" abstract="false" name="GrossLosses" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fcf_ScheduleOfUnrealizedLossesAndEstimatedFairValuesTable" abstract="true" name="ScheduleOfUnrealizedLossesAndEstimatedFairValuesTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="fcf_USGovernmentAgenciesDebtSecuritiesCommercialMember" abstract="true" name="USGovernmentAgenciesDebtSecuritiesCommercialMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_CorporateSecuritiesMember" abstract="true" name="CorporateSecuritiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_ScheduleOfUnrealizedLossesAndEstimatedFairValuesLineItems" abstract="true" name="ScheduleOfUnrealizedLossesAndEstimatedFairValuesLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="fcf_InvestmentSecuritiesContinuousUnrealizedLossPositionLessthanTwelveMonthsFairValue" abstract="false" name="InvestmentSecuritiesContinuousUnrealizedLossPositionLessthanTwelveMonthsFairValue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fcf_InvestmentSecuritiesContinuousUnrealizedLossPositionLessthan12MonthsAccumulatedLoss" abstract="false" name="InvestmentSecuritiesContinuousUnrealizedLossPositionLessthan12MonthsAccumulatedLoss" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fcf_InvestmentSecuritiesContinuousUnrealizedLossPositionTwelveMonthsorLongerFairValue" abstract="false" name="InvestmentSecuritiesContinuousUnrealizedLossPositionTwelveMonthsorLongerFairValue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fcf_InvestmentSecuritiesContinuousUnrealizedLossPosition12MonthsorLongerAccumulatedLoss" abstract="false" name="InvestmentSecuritiesContinuousUnrealizedLossPosition12MonthsorLongerAccumulatedLoss" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fcf_InvestmentSecuritiesContinuousUnrealizedLossPositionFairValueTotal" abstract="false" name="InvestmentSecuritiesContinuousUnrealizedLossPositionFairValueTotal" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fcf_InvestmentSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss" abstract="false" name="InvestmentSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fcf_EquitySecuritiesFVNIUnrealizedGainLossStillHeldAtPeriodEnd" abstract="false" name="EquitySecuritiesFVNIUnrealizedGainLossStillHeldAtPeriodEnd" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fcf_PercentOfUnrealizedLosses" abstract="false" name="PercentOfUnrealizedLosses" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="fcf_InvestmentSecuritiesinUnrealizedLossPositionQualitativeDisclosureNumberofPositionsTotal" abstract="false" name="InvestmentSecuritiesinUnrealizedLossPositionQualitativeDisclosureNumberofPositionsTotal" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="fcf_ExpectedClassCVisaShares" abstract="false" name="ExpectedClassCVisaShares" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="fcf_ExpectedClassB2Shares" abstract="false" name="ExpectedClassB2Shares" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="fcf_BookValueOfAvailableForSaleDebtSecuritiesSold" abstract="false" name="BookValueOfAvailableForSaleDebtSecuritiesSold" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fcf_CommercialCreditCardsMember" abstract="true" name="CommercialCreditCardsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_ConsumerCreditCardsMember" abstract="true" name="ConsumerCreditCardsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_DefaultStatusOfModificationsAfterNumberOfDaysPastDue" abstract="false" name="DefaultStatusOfModificationsAfterNumberOfDaysPastDue" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="fcf_TermLoanReceivableOriginatedInCurrentYearMember" abstract="true" name="TermLoanReceivableOriginatedInCurrentYearMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_TermLoanReceivableOriginatedInOneYearPriorMember" abstract="true" name="TermLoanReceivableOriginatedInOneYearPriorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_TermLoanReceivableOriginatedTwoYearsPriorMember" abstract="true" name="TermLoanReceivableOriginatedTwoYearsPriorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_TermLoanReceivableOriginatedThreeYearsPriorMember" abstract="true" name="TermLoanReceivableOriginatedThreeYearsPriorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_TermLoanReceivableOriginatedFourYearsPriorMember" abstract="true" name="TermLoanReceivableOriginatedFourYearsPriorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_TermLoanReceivableOriginatedFiveOrMoreYearsPriorMember" abstract="true" name="TermLoanReceivableOriginatedFiveOrMoreYearsPriorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_RevolvingLoansReceivableMember" abstract="true" name="RevolvingLoansReceivableMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_NonAccrualLoansMember" abstract="true" name="NonAccrualLoansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_ExtendedMaturityAndPaymentDeferralMember" abstract="true" name="ExtendedMaturityAndPaymentDeferralMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="fcf_ContractualInterestRateReductionAndPaymentDeferralMember" abstract="true" name="ContractualInterestRateReductionAndPaymentDeferralMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="fcf_ContractualInterestRateReductionTermExtensionAndPaymentDeferralMember" abstract="true" name="ContractualInterestRateReductionTermExtensionAndPaymentDeferralMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="fcf_FinancingReceivableModifiedPaymentDeferral" abstract="false" name="FinancingReceivableModifiedPaymentDeferral" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:weightItemType"/>
  <xs:element id="fcf_FinancingReceivableModifiedInPeriodAgingAmount" abstract="false" name="FinancingReceivableModifiedInPeriodAgingAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fcf_ChargeoffsAxis" abstract="true" name="ChargeoffsAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="fcf_ChargeoffsDomain" abstract="true" name="ChargeoffsDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_NonperformingLoansAxis" abstract="true" name="NonperformingLoansAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="fcf_NonperformingLoansDomain" abstract="true" name="NonperformingLoansDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_NonaccrualLoansPaidOffAxis" abstract="true" name="NonaccrualLoansPaidOffAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="fcf_NonaccrualLoansPaidOffDomain" abstract="true" name="NonaccrualLoansPaidOffDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_IncreasesDecreasesinTroubledDebtRestructuringsAxis" abstract="true" name="IncreasesDecreasesinTroubledDebtRestructuringsAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="fcf_IncreasesDecreasesinTroubledDebtRestructuringsDomain" abstract="true" name="IncreasesDecreasesinTroubledDebtRestructuringsDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_PartofLoanRelationshipAxis" abstract="true" name="PartofLoanRelationshipAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="fcf_PartofLoanRelationshipDomain" abstract="true" name="PartofLoanRelationshipDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_IncreasesDecreasesinNonperformingLoansAxis" abstract="true" name="IncreasesDecreasesinNonperformingLoansAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="fcf_IncreasesinNonperformingLoansDomain" abstract="true" name="IncreasesinNonperformingLoansDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_NonaccrualCommercialLoansAxis" abstract="true" name="NonaccrualCommercialLoansAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="fcf_NonaccrualCommercialLoansDomain" abstract="true" name="NonaccrualCommercialLoansDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_NonaccrualCommercialLoansMember" abstract="true" name="NonaccrualCommercialLoansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_LoanToDifferentProjectAxis" abstract="true" name="LoanToDifferentProjectAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="fcf_LoanToDifferentProjectDomain" abstract="true" name="LoanToDifferentProjectDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_NetDeferredFeesMember" abstract="true" name="NetDeferredFeesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_UnearnedPremiumsAndDiscountsMember" abstract="true" name="UnearnedPremiumsAndDiscountsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_NonAccrualStatusOfLoansAfterNumberOfDaysPastDue" abstract="false" name="NonAccrualStatusOfLoansAfterNumberOfDaysPastDue" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="fcf_UnfundedCommitmentsRelatedToNonperformingLoans" abstract="false" name="UnfundedCommitmentsRelatedToNonperformingLoans" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fcf_OffBalanceSheetReserveToNonperformingLoans" abstract="false" name="OffBalanceSheetReserveToNonperformingLoans" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fcf_ForecastedValueNationalUnemploymentPercent" abstract="false" name="ForecastedValueNationalUnemploymentPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="fcf_LimitedPartnershipInvestmentMember" abstract="true" name="LimitedPartnershipInvestmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_ImpairedLoansFairValue" abstract="false" name="ImpairedLoansFairValue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fcf_OtherRealEstateOwnedAssetsFairValue" abstract="false" name="OtherRealEstateOwnedAssetsFairValue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fcf_FairValueMeasurementOfAssetsOnNonrecurringBasisNetLossesOnImpairedLoans" abstract="false" name="FairValueMeasurementOfAssetsOnNonrecurringBasisNetLossesOnImpairedLoans" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fcf_FairValueMeasurementOfAssetsOnNonrecurringBasisNetLossesOnOtherRealEstateOwned" abstract="false" name="FairValueMeasurementOfAssetsOnNonrecurringBasisNetLossesOnOtherRealEstateOwned" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fcf_FairValueMeasurementOfAssetsOnNonrecurringBasisNetLoss" abstract="false" name="FairValueMeasurementOfAssetsOnNonrecurringBasisNetLoss" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fcf_FairValueMeasurementsOfFinancialInstrumentsTable" abstract="true" name="FairValueMeasurementsOfFinancialInstrumentsTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="fcf_ImpairedLoansFairValueNonCollection" abstract="false" name="ImpairedLoansFairValueNonCollection" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fcf_UpdatedAppraisalRequirementFloor" abstract="false" name="UpdatedAppraisalRequirementFloor" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fcf_RiskparticipationAgreementsTable" abstract="true" name="RiskparticipationAgreementsTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="fcf_ContractMaturityAxis" abstract="true" name="ContractMaturityAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="fcf_ContractMaturityDomain" abstract="true" name="ContractMaturityDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_A2024Member" abstract="true" name="A2024Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_A2026Member" abstract="true" name="A2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_FourYearOiriginalMaturityMember" abstract="true" name="FourYearOiriginalMaturityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_FiveYearOriginalMaturityMember" abstract="true" name="FiveYearOriginalMaturityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_ThreeYearOriginalMaturityMember" abstract="true" name="ThreeYearOriginalMaturityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_InterestRateMacroSwapMember" abstract="true" name="InterestRateMacroSwapMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_InterestRateSwapMemberDebtMember" abstract="true" name="InterestRateSwapMemberDebtMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_RiskParticipationAgreementsAxis" abstract="true" name="RiskParticipationAgreementsAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="fcf_RiskParticipationAgreementsDomain" abstract="true" name="RiskParticipationAgreementsDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_RiskParticipationAgreementsPurchasedDomain" abstract="true" name="RiskParticipationAgreementsPurchasedDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_RiskParticipationAgreementsSoldDomain" abstract="true" name="RiskParticipationAgreementsSoldDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_MaturityDateAxis" abstract="true" name="MaturityDateAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="fcf_MaturityDateDomain" abstract="true" name="MaturityDateDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="fcf_A1212024Member" abstract="true" name="A1212024Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="fcf_A512025Member" abstract="true" name="A512025Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="fcf_A8252025Member" abstract="true" name="A8252025Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="fcf_A10102025Member" abstract="true" name="A10102025Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="fcf_A1152025Member" abstract="true" name="A1152025Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="fcf_A512026Member" abstract="true" name="A512026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="fcf_A10152026Member" abstract="true" name="A10152026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="fcf_RiskparticipationAgreementsLineItems" abstract="true" name="RiskparticipationAgreementsLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="fcf_DerivativeInstrumentsDesignatedAsHedgingInstrumentsInterestExpense" abstract="false" name="DerivativeInstrumentsDesignatedAsHedgingInstrumentsInterestExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fcf_DerivativeLiabilityCostBasisGrossAsset" abstract="false" name="DerivativeLiabilityCostBasisGrossAsset" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fcf_DerivativeLiabilityNotionalAmountGrossAsset" abstract="false" name="DerivativeLiabilityNotionalAmountGrossAsset" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fcf_InterestRateCollarMember" abstract="true" name="InterestRateCollarMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_DerivativeInstrumentsDesignatedAsHedgingInstrumentsInterestIncome" abstract="false" name="DerivativeInstrumentsDesignatedAsHedgingInstrumentsInterestIncome" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="fcf_FirstCommonwealthBank2028Member" abstract="true" name="FirstCommonwealthBank2028Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_FirstCommonwealthBank2033Member" abstract="true" name="FirstCommonwealthBank2033Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_FirstCommonwealthCapitalTrustIIMember" abstract="true" name="FirstCommonwealthCapitalTrustIIMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_FirstCommonwealthCapitalTrustIIIMember" abstract="true" name="FirstCommonwealthCapitalTrustIIIMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_FirstCommonwealthFinancialCorporationMember" abstract="true" name="FirstCommonwealthFinancialCorporationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_SubordinatedDebenturesAdditionalInformationAbstract" abstract="true" name="SubordinatedDebenturesAdditionalInformationAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="fcf_SubordinatedDebtParAmount" abstract="false" name="SubordinatedDebtParAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fcf_InScopeandOutofScopeRevenueAbstract" abstract="true" name="InScopeandOutofScopeRevenueAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="fcf_ScopeofTopic606Axis" abstract="true" name="ScopeofTopic606Axis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="fcf_ScopeofTopic606Domain" abstract="true" name="ScopeofTopic606Domain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_InScopeofTopic606Member" abstract="true" name="InScopeofTopic606Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_OutOfScopeofTopic606Member" abstract="true" name="OutOfScopeofTopic606Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fcf_AdditionalInformationAbstract" abstract="true" name="AdditionalInformationAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="fcf_IncentiveRevenue" abstract="false" name="IncentiveRevenue" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
</xs:schema>
