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INVESTMENT SECURITIES - Investments Sold (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Proceeds from Sale and Maturity of Debt Securities, Available-for-sale [Abstract]    
Proceeds from Sale of Debt Securities, Available-for-sale $ 16,800 $ 32,300
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]    
Debt Securities, Available-for-sale, Realized Gain $ 6