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Securities - Sales of Securities Available for Sale (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Investments, Debt and Equity Securities [Abstract]        
Proceeds $ 3,013 $ 17,536 $ 5,103 $ 25,077
Gross gains 110 952 145 1,060
Gross losses $ (113) $ (185) $ (113) $ (185)