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Investment Securities Gains and Losses (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]        
Proceeds from sales of securities $ 1,351 $ 1 $ 10,305 $ 35,466
Gross realized gains 137 1 668 1,396
Gross realized losses 0 0 0 0
Net gain 137 1 668 1,396
Related income taxes $ 48 $ 0 $ 234 $ 489