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Securities - Information Pertaining to Security Sales (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]      
Proceeds $ 4,420 $ 105,066 $ 61,236
Gross Gains 1,005 1,032 606
Gross Losses $ 0 $ 366 $ 177