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Investment Securities - Unrealized Gain (Loss) on Investments (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]        
Unrealized gain (loss) on investment securities held at the end of the period $ (2,098) $ 276 $ 1,516 $ 522