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Investment Securities - Securities Gains and Losses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]      
Proceeds from sales of securities $ 15,587 $ 10,309 $ 35,468
Gross realized gains 471 673 1,399
Gross realized losses 0 0 0
Net gain 471 673 1,399
Related income taxes $ 165 $ 236 $ 490