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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]        
Proceeds from sale of investment securities $ 0 $ 0 $ 75,719 $ 0
Gross gains 11 9 1,362 0
Gross losses $ 0 $ 0 $ 1,206 $ 31