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INVESTMENT SECURITIES - Proceeds from Sales of AFS Securities and Gross Gains and Gross Losses (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract]    
Proceeds from sale of investment securities $ 3,075 $ 75,736
Gross gains 25 1,351
Gross losses $ 0 $ 1,206