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Securities - Schedule of Proceeds from Sales of Debt Securities and the Associated Gross Gains and Losses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Investments Debt And Equity Securities [Abstract]      
Proceeds $ 123,016 $ 32,441 $ 34,338
Gross gains 5 $ 35 17
Gross losses $ (277)   $ (73)