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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, 2017
Sep. 30, 2018
Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]        
Proceeds $ 7,485 $ 387 $ 17,321 $ 5,490
Gross gains   $ 6 37 151
Gross losses $ (122)   $ (148) $ (113)