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INVESTMENT SECURITIES (Proceeds from sales and calls of securities and associated gains and losses) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
INVESTMENT SECURITIES        
Proceeds from sale of securities available for sale, amortized cost $ 0 $ 25,000 $ 42,600  
Sale of available for sale securities, at amortized cost       $ 108,100
Proceeds from calls of securities available for sale, at amortized cost       30,000
Proceeds   $ 25,000 43,241 141,422
Gross gains     609 3,286
Tax impact     $ (195) $ (1,036)