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Securities - Sales of Securities Available for Sale (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]      
Proceeds $ 98,425 $ 38,519 $ 5,490
Gross gains 168 37 151
Gross losses $ (243) $ (480) $ (113)