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Commitments and Contingent Liabilities - Additional Information (Detail) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Loss Contingencies [Line Items]    
Notional Amount Of Performance Standby Letters Of Credit $ 1,500,000fcf_NotionalAmountOfPerformanceStandbyLettersOfCredit  
Notional Amount Of Commercial Letters Of Credit 0fcf_NotionalAmountOfCommercialLettersOfCredit  
Notional Amount Of Financial Standby Letters Of Credit 0fcf_NotionalAmountOfFinancialStandbyLettersOfCredit  
Financial instrument of credit risk 200,000us-gaap_FairValueConcentrationOfRiskCommitments 200,000us-gaap_FairValueConcentrationOfRiskCommitments
Unfunded commitment liability $ 3,600,000fcf_ReserveForOffBalanceSheetActivities $ 3,100,000fcf_ReserveForOffBalanceSheetActivities