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Securities - Sales of Securities Available for Sale (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]      
Proceeds $ 5,490 $ 182,549 $ 43,051
Gross gains 151 2,646 254
Gross losses $ (113) $ (810) $ (65)