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Securities - Sales of Securities Available for Sale (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Investments, Debt and Equity Securities [Abstract]      
Proceeds $ 45,228 $ 13,332 $ 45,228
Gross gains 1,001 147 1,001
Gross losses $ (13) $ (23) $ (13)