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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, 2018
Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]      
Proceeds $ 3,013 $ 9,836 $ 5,103
Gross gains 110 37 145
Gross losses $ (113) $ (26) $ (113)