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Loans and Allowance for Credit Losses - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Provision for credit losses | $ 11,196,000us-gaap_ProvisionForLoanAndLeaseLosses | $ 19,227,000us-gaap_ProvisionForLoanAndLeaseLosses | $ 20,544,000us-gaap_ProvisionForLoanAndLeaseLosses
Charge-offs | 17,472,000us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs | 35,178,000us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs | 16,969,000us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Recorded Investment | 55,251,000us-gaap_ImpairedFinancingReceivableRecordedInvestment | 59,383,000us-gaap_ImpairedFinancingReceivableRecordedInvestment |
Nonaccrual | 42,667,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus | 45,888,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus |
Loans held for sale | 2,502,000us-gaap_LoansReceivableHeldForSaleNet | 0us-gaap_LoansReceivableHeldForSaleNet |
Total gains or losses included in earnings | 77,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 | (770,000)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 |
Loans with modification to rate and payment due to amortization | 600,000fcf_LoansWithModificationsToRateAndPaymentDueToReamortization | 2,000,000fcf_LoansWithModificationsToRateAndPaymentDueToReamortization | 4,700,000fcf_LoansWithModificationsToRateAndPaymentDueToReamortization
Minimum days required for conversion of trouble debt to be in default | 90 days |  |
Water Treatment Plant [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans |  | 2,800,000fcf_NewNonAccrualLoans / us-gaap_ParticipatingMortgageLoansAxis = fcf_WaterTreatmentPlantMember |
Gas Well Servicing Operation [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans |  | 3,700,000fcf_NewNonAccrualLoans / us-gaap_ParticipatingMortgageLoansAxis = fcf_GasWellServicingOperationMember |
Commercial real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans |  |  | 3,300,000fcf_NewNonAccrualLoans / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = us-gaap_CommercialRealEstateMember
Loan maturity extension |  |  | 6 months
Commercial real estate [Member] | Gas Well Servicing Operation [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans |  | 17,000,000fcf_NewNonAccrualLoans / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = us-gaap_CommercialRealEstateMember / us-gaap_ParticipatingMortgageLoansAxis = fcf_GasWellServicingOperationMember |
Impaired Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Increase In Commitments Related To Troubled Debt Restructured Loans | 3,700,000fcf_IncreaseInCommitmentsRelatedToTroubledDebtRestructuredLoans / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = fcf_ImpairedLoansMember |  |
Troubled Debt Restructured Loans Decreased | 900,000fcf_TroubledDebtRestructuredLoansDecreased / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = fcf_ImpairedLoansMember |  |
Decrease in nonperforming loans | (4,100,000)fcf_IncreaseDecreaseInNonperformingLoans / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = fcf_ImpairedLoansMember |  |
Decrease In Specific Allowance For Nonperforming Loans | (600,000)fcf_DecreaseInSpecificAllowanceForNonperformingLoans / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = fcf_ImpairedLoansMember |  |
Unfunded commitments related to nonperforming loans | 46,000fcf_UnfundedCommitmentsRelatedToNonperformingLoans / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = fcf_ImpairedLoansMember |  |
Non Accrual Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Decrease in nonperforming loans | 32,200,000fcf_IncreaseDecreaseInNonperformingLoans / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = fcf_NonAccrualLoansMember |  |
Unallocated [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Provision for credit losses |  | (5,926,000)us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_UnallocatedFinancingReceivablesMember | 1,090,000us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_UnallocatedFinancingReceivablesMember
Charge-offs |  | 0us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_UnallocatedFinancingReceivablesMember | 0us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_UnallocatedFinancingReceivablesMember
Consumer Loan [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Non Accrual Status Of Loans After Number Of Days Past Due | 150 days |  |
Nonaccrual Commercial Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Amount Of Non Accrual Status Loan | 22,100,000fcf_AmountOfNonAccrualStatusLoan / fcf_LoanToDifferentProjectAxis = fcf_NonaccrualCommercialLoansMember |  |
Nonaccrual Consumer Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Amount Of Non Accrual Status Loan | 3,800,000fcf_AmountOfNonAccrualStatusLoan / fcf_LoanToDifferentProjectAxis = fcf_NonaccrualConsumerLoansMember |  |
Western Pennsylvania Specialty Metal Processor [Member] | Nonaccrual Commercial Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Amount Of Non Accrual Status Loan | 8,000,000fcf_AmountOfNonAccrualStatusLoan / fcf_LoanToDifferentProjectAxis = fcf_NonaccrualCommercialLoansMember / fcf_NonaccrualCommercialLoansAxis = fcf_WesternPennsylvaniaSpecialtyMetalProcessorMember |  |
Western Pennsylvania Reals Estate Manager [Member] | Nonaccrual Commercial Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual | 9,900,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / fcf_LoanToDifferentProjectAxis = fcf_NonaccrualCommercialLoansMember / fcf_NonaccrualCommercialLoansAxis = fcf_WesternPennsylvaniaRealsEstateManagerMember |  |
Local Energy Company [Member] | Nonaccrual Commercial Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual | 10,000,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / fcf_LoanToDifferentProjectAxis = fcf_NonaccrualCommercialLoansMember / fcf_NonaccrualCommercialLoansAxis = fcf_LocalEnergyCompanyMember |  |
Reserve for Off-balance Sheet Activities [Member] | Impaired Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Off balance sheet reserve to nonperforming loans | 0fcf_OffBalanceSheetReserveToNonperformingLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_ReserveForOffBalanceSheetActivitiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = fcf_ImpairedLoansMember |  |
Loans Held for Sale [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total gains or losses included in earnings | $ 77,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByAssetClassAxis = fcf_LoansHeldForSaleMember | $ 625,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByAssetClassAxis = fcf_LoansHeldForSaleMember |
Commercial real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Modification, Subsequent Default, Number of Contracts |  | 1fcf_FinancingReceivableModificationSubsequentDefaultNumberofContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateMember | 0fcf_FinancingReceivableModificationSubsequentDefaultNumberofContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateMember

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