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Securities - Sales of Securities Available for Sale (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]      
Proceeds $ 38,519 $ 5,490 $ 182,549
Gross gains 37 151 2,646
Gross losses $ (480) $ (113) $ (810)