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OTHER COMPREHENSIVE INCOME (LOSS) - Changes in the Accumulated Balances (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Changes in the accumulated balances for each component of other comprehensive income      
Balance at beginning of period $ 160,564 $ 150,553 $ 150,553
Current year-to-date other comprehensive income (486) (1,138) 1,961
Balance at end of period 160,662 147,933 160,564
Unrealized Gains (Losses) on Securities      
Changes in the accumulated balances for each component of other comprehensive income      
Balance at beginning of period 2,056 (649) (649)
Current year-to-date other comprehensive income (672)   2,705
Balance at end of period 1,384   2,056
Other Accumulated Comprehensive Income (Loss), net of tax      
Changes in the accumulated balances for each component of other comprehensive income      
Balance at beginning of period 1,490 (471) (471)
Balance at end of period $ 1,004 $ (1,609) $ 1,490