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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
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