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Securities - Information Pertaining to Security Sales (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Investments, Debt and Equity Securities [Abstract]        
Proceeds $ 5,434 $ 4,420 $ 7,618 $ 4,420
Gross Gains 155 1,005 1,538 1,005
Gross Losses $ 0 $ 0 $ 0 $ 0