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Securities - Information Pertaining to Security Sales (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]      
Proceeds $ 16,340 $ 4,420 $ 105,066
Gross Gains 1,614 1,005 1,032
Gross Losses $ 71 $ 0 $ 366