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Securities - Information Pertaining to Security Sales (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Investments, Debt and Equity Securities [Abstract]        
Proceeds $ 7,757 $ 0 $ 15,374 $ 4,420
Gross Gains 76 0 1,614 1,005
Gross Losses $ (71) $ 0 $ (71) $ 0