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Loans and Allowance for Credit Losses - Troubled Debt Restructured Loans and Commitments (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Loans and Leases Receivable Disclosure [Abstract] |  |  |
Accrual status | $ 12,584fcf_FinancingReceivableTroubledDebtRestructuredLoansAccrualStatus | $ 13,495fcf_FinancingReceivableTroubledDebtRestructuredLoansAccrualStatus | $ 13,037fcf_FinancingReceivableTroubledDebtRestructuredLoansAccrualStatus
Nonaccrual status | 16,952fcf_FinancingReceivableTroubledDebtRestructuredLoansNonaccrualStatus | 16,980fcf_FinancingReceivableTroubledDebtRestructuredLoansNonaccrualStatus | 50,979fcf_FinancingReceivableTroubledDebtRestructuredLoansNonaccrualStatus
Total | 29,536fcf_TroubledDebtRestructuringLoans | 30,475fcf_TroubledDebtRestructuringLoans | 64,016fcf_TroubledDebtRestructuringLoans
Letters of credit | 0us-gaap_LettersOfCreditOutstandingAmount | 0us-gaap_LettersOfCreditOutstandingAmount | 1,574us-gaap_LettersOfCreditOutstandingAmount
Unused lines of credit | 4,120fcf_UnusedLineOfCreditTroubledDebtRestructured | 452fcf_UnusedLineOfCreditTroubledDebtRestructured | 0fcf_UnusedLineOfCreditTroubledDebtRestructured
Total | $ 4,120fcf_CommitmentsNet | $ 452fcf_CommitmentsNet | $ 1,574fcf_CommitmentsNet

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- Definition Total commitments. + References No definition available. + Details
Name: | fcf_CommitmentsNet
Namespace Prefix: | fcf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Financing receivable troubled debt restructured loans accrual status. + References No definition available. + Details
Name: | fcf_FinancingReceivableTroubledDebtRestructuredLoansAccrualStatus
Namespace Prefix: | fcf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Financing receivable troubled debt restructured loans non-accrual status. + References No definition available. + Details
Name: | fcf_FinancingReceivableTroubledDebtRestructuredLoansNonaccrualStatus
Namespace Prefix: | fcf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Troubled debt restructuring loans. + References No definition available. + Details
Name: | fcf_TroubledDebtRestructuringLoans
Namespace Prefix: | fcf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The total amount of unused lines of credit associated with troubled debt restructured loans as of the reporting date. + References No definition available. + Details
Name: | fcf_UnusedLineOfCreditTroubledDebtRestructured
Namespace Prefix: | fcf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_LoansAndLeasesReceivableDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration