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Investment Securities - Schedule of Gains and Losses From Sales of Investment Securities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Investments Debt And Equity Securities [Abstract]        
Gross Gains on Sales of Investment Securities $ 110   $ 3,785 $ 14,257
Gross Losses on Sales of Investment Securities (1,369) $ (1,121) (3,824) (3,132)
Net Gains (Losses) on Sales of Investment Securities $ (1,259) $ (1,121) $ (39) $ 11,125