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Securities - Unrealized Gains (Losses) on Marketable Securities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]        
Net market gains/(losses) recognized $ 156 $ (111) $ (110) $ 171
Less: Net gains recognized for equity securities sold 0 0 0 0
Unrealized Gains/(Losses) on Equity Securities Still Held $ 156 $ (111) $ (110) $ 171