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Securities - Schedule of Proceeds from Sales of Debt Securities and the Associated Gross Gains and Losses (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Investments Debt And Equity Securities [Abstract]        
Proceeds $ 88,820 $ 2,936 $ 123,016 $ 2,936
Gross gains   $ 35 5 $ 35
Gross losses     $ (277)