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Securities - Gain on Sales of Available-for-sale Securities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]    
Proceeds $ 6,618 $ 36,314
Gains 108 876
Losses (26) (22)
Tax provision related to gains $ 28 $ 290