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Securities - Gains and Losses on Sales of Securities Available for Sale (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Amortized Cost and Fair Value Debt Securities [Abstract]      
Gross gains on sales of securities $ 141us-gaap_AvailableForSaleSecuritiesGrossRealizedGains $ 353us-gaap_AvailableForSaleSecuritiesGrossRealizedGains $ 420us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Gross losses on sales of securities (3)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses (182)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses (98)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Net realized gains on sales of securities available for sale $ 138us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet $ 171us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet $ 322us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet