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Loans and Allowance for Credit Losses - Additional Information (Detail) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Charge-offs | $ 7,109,000 us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs | $ 3,646,000 us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs |
Unfunded commitments related to nonperforming loans | 600,000 fcf_UnfundedCommitmentsRelatedToNonperformingLoans |  | 0 fcf_UnfundedCommitmentsRelatedToNonperformingLoans
Off balance sheet reserve to nonperforming loans | 0 fcf_OffBalanceSheetReserveToNonperformingLoans |  |
Loans held for sale | 3,000,000 fcf_LoansHeldforSaleImpaired |  | 0 fcf_LoansHeldforSaleImpaired
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales | 716,000 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales |
Total gains or losses included in earnings | 105,000 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 |
Nonaccrual | 33,565,000 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus |  | 42,667,000 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Recorded investment | 46,195,000 us-gaap_ImpairedFinancingReceivableRecordedInvestment |  | 55,251,000 us-gaap_ImpairedFinancingReceivableRecordedInvestment
Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Non Accrual Status Of Loans After Number Of Days Past Due | 150 days |  |
Impaired Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans with modifications to rate and payment due to reamortization | 300,000 fcf_LoansWithModificationsToRateAndPaymentDueToReamortization / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = fcf_ImpairedLoansMember | 200,000 fcf_LoansWithModificationsToRateAndPaymentDueToReamortization / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = fcf_ImpairedLoansMember |
Loans Held For Sale [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  | 716,000 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales / us-gaap_FairValueByAssetClassAxis = fcf_LoansHeldForSaleMember |
Total gains or losses included in earnings |  | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByAssetClassAxis = fcf_LoansHeldForSaleMember |
Water Facility Construction [Member] | Nonaccrual Commercial Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Recorded investment | 9,300,000 us-gaap_ImpairedFinancingReceivableRecordedInvestment / fcf_LoanToDifferentProjectAxis = fcf_NonaccrualCommercialLoansMember / fcf_NonaccrualCommercialLoansAxis = fcf_WaterFacilityConstructionMember |  |
Non Accrual Loans [Member] | Local Energy Company [Member] [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual | 6,100,000 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / fcf_LoanToDifferentProjectAxis = fcf_LocalEnergyCompanyMemberMember / fcf_NonaccrualCommercialLoansAxis = fcf_NonAccrualLoansMember |  |
Charge-off recognized | 3,300,000 fcf_Chargeoffrecognized / fcf_LoanToDifferentProjectAxis = fcf_LocalEnergyCompanyMemberMember / fcf_NonaccrualCommercialLoansAxis = fcf_NonAccrualLoansMember |  |
2012 Troubled Debt Restructuring [Member] | Non Accrual Loans [Member] | Local Energy Company [Member] [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual | 2,400,000 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / fcf_LoanToDifferentProjectAxis = fcf_LocalEnergyCompanyMemberMember / fcf_NonaccrualCommercialLoansAxis = fcf_NonAccrualLoansMember / fcf_PartofLoanRelationshipAxis = fcf_A2012TroubledDebtRestructuringMember |  |
2014 Troubled Debt Restructuring [Member] | Non Accrual Loans [Member] | Local Energy Company [Member] [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual | $ 3,100,000 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / fcf_LoanToDifferentProjectAxis = fcf_LocalEnergyCompanyMemberMember / fcf_NonaccrualCommercialLoansAxis = fcf_NonAccrualLoansMember / fcf_PartofLoanRelationshipAxis = fcf_A2014TroubledDebtRestructuringMember |  |

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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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