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Loans and Allowance for Credit Losses - Troubled Debt Restructured Loans and Commitments (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Financing Receivable, Troubled Debt Restructurings [Line Items] |  |
Financing Receivable, Modifications, Recorded Investment | $ 21,608 us-gaap_FinancingReceivableModificationsRecordedInvestment | $ 29,536 us-gaap_FinancingReceivableModificationsRecordedInvestment
Unused lines of Credit [Member] |  |
Financing Receivable, Troubled Debt Restructurings [Line Items] |  |
Loans and Leases Receivable, Impaired, Commitment to Lend | 391 us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend / fcf_UnusedCommitmentsAxis = us-gaap_UnusedLinesOfCreditMember | 4,120 us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend / fcf_UnusedCommitmentsAxis = us-gaap_UnusedLinesOfCreditMember
Accrual Loans [Member] [Member] |  |
Financing Receivable, Troubled Debt Restructurings [Line Items] |  |
Financing Receivable, Modifications, Recorded Investment | 12,630 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_RestructuringCostAndReserveAxis = fcf_AccrualLoansMember | 12,584 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_RestructuringCostAndReserveAxis = fcf_AccrualLoansMember
Non Accrual Loans [Member] |  |
Financing Receivable, Troubled Debt Restructurings [Line Items] |  |
Financing Receivable, Modifications, Recorded Investment | $ 8,978 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_RestructuringCostAndReserveAxis = fcf_NonAccrualLoansMember | $ 16,952 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_RestructuringCostAndReserveAxis = fcf_NonAccrualLoansMember

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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
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- Definition Reflects the unfunded portion of contractual agreements to lend funds to borrowers for loans whose terms have been modified by troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18794-111554 + Details
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