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Securities - Schedule of Proceeds from Sales of Securities and the Associated Gross 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 $ 32,441 $ 34,338 $ 17,635
Gross gains $ 35 17 $ 259
Gross losses   $ (73)