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Securities - Schedule of Sale of Securities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Realized gains (losses):        
Gross realized gains $ 0 $ 81 $ 605 $ 674
Gross realized losses 0 (8) (15) (13)
Net realized gains 0 73 590 661
Proceeds from sales of securities $ 0 $ 0 $ 55,403 $ 9,317