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Securities - Sales of Securities Available for Sale (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]      
Proceeds $ 7,485 $ 91,635 $ 17,321
Gross gains   158 37
Gross losses $ (122) $ (243) $ (148)