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INVESTMENT SECURITIES - Proceeds from Sales of Securities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Proceeds from sales of securities [Abstract]      
Proceeds from sales of securities $ 0 $ 590,179 $ 0
U.S. Treasury and Agency Securities [Member]      
Proceeds from sales of securities [Abstract]      
Proceeds from sales of securities   590,200  
Gross realized gains   5,000  
Gross realized losses   $ 100