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Investment Securities - Proceeds from Sale, Gross Gains (Losses) Realized on Sales, Maturities and Other-Than-Temporary Impairment Charges Related to Securities Available for Sale (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Investments, Debt and Equity Securities [Abstract]      
Proceeds from sale $ 132,868us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds $ 671us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds $ 0us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds
Sales Transactions:      
Gross gains 291us-gaap_AvailableForSaleSecuritiesGrossRealizedGains 233us-gaap_AvailableForSaleSecuritiesGrossRealizedGains 0us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Gross losses (243)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses 0us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses 0us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Total gain (losses) from sales transactions 48us-gaap_AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments 233us-gaap_AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments 0us-gaap_AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments
Maturities, calls and impairment:      
Gross gains 502fcf_GrossGains 4fcf_GrossGains 192fcf_GrossGains
Gross losses 0fcf_GrossLosses (1,395)fcf_GrossLosses 0fcf_GrossLosses
Other-than-temporary impairment 0fcf_OtherThanTemporaryImpairment 0fcf_OtherThanTemporaryImpairment 0fcf_OtherThanTemporaryImpairment
Total gain (losses) maturities and impairment 502fcf_GainLossesMaturitiesAndImpairment (1,391)fcf_GainLossesMaturitiesAndImpairment 192fcf_GainLossesMaturitiesAndImpairment
Net gains (losses) and impairment $ 550fcf_NetGainsAndImpairment $ (1,158)fcf_NetGainsAndImpairment $ 192fcf_NetGainsAndImpairment