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Investment Securities - Gross Realized Gains (Losses) on Sale of Securities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Gain Loss On Sale Of Investments [Abstract]    
Realized gains on investments $ 33 $ 222
Realized losses on investments (7) (143)
Total $ 26 $ 79