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DEBT SECURITIES - Gains and losses on debt securities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Realized gains and losses on debt securities      
Gross gains on debt securities $ 115 $ 543 $ 1,732
Gross (losses) on debt securities (89) (514) (8)
Realized net gains (losses) on debt securities $ 26 $ 29 $ 1,724