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Investment Securities - Realized Gains and Losses (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Investments, Debt and Equity Securities [Abstract]    
Amortized cost of AFS investment securities sold $ 304,182 $ 658,505
Gross realized gains 986 13,637
Gross realized (losses) (848) (11,503)
Net realized gains on sales of AFS investment securities $ 138 $ 2,134