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Investment Securities - Realized Gains and Losses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]      
Gross realized gains $ 1,537 $ 558 $ 273
Gross realized losses (19) (228) (136)
Net realized gains $ 1,518 $ 330 $ 137