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INVESTMENT SECURITIES - Summary of Proceeds from Sale of Available for Sale Securities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]      
Proceeds from sale of investment securities $ 0 $ 199,429 $ 156,364
Gross gains 0 4,974 1,681
Gross losses $ 16 $ 225 $ 675