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Securities - Sales of Securities Available for Sale (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract]      
Proceeds $ 17,536 $ 25,077 $ 13,332
Gross gains 952 1,060 147
Gross losses $ (185) $ (185) $ (23)