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Securities - Sales of Securities Available for Sale (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]  
Proceeds $ 13,332us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
Gross gains 147us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
Gross losses $ (23)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss