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Securities - 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
Investments, Debt and Equity Securities [Abstract]      
Proceeds $ 45,228us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities $ 23,853us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities $ 14,989us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
Gross gains 988us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains 382us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains 2us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
Gross losses   $ (8)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss