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OTHER COMPREHENSIVE INCOME (LOSS) - Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Before-Tax Amount |  |  |
Other comprehensive loss | $ (672) | $ (1,570) |
Tax Expense |  |  |
Other comprehensive income (loss) | 186 | 432 |
Net-of-Tax Amount |  |  |
Other comprehensive loss | (486) | (1,138) | $ 1,961
Unrealized Gains (Losses) on Securities |  |  |
Before-Tax Amount |  |  |
Net unrealized losses arising during the period | (672) | (1,643) |
Reclassification adjustment for gains included in net income | 0 | 73 |
Tax Expense |  |  |
Net unrealized losses arising during the period | 186 | 452 |
Reclassification adjustment for gains included in net income | 0 | (20) |
Net-of-Tax Amount |  |  |
Net unrealized losses arising during the period | (486) | (1,191) |
Reclassification adjustment for gains included in net income | $ 0 | $ 53 |

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