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EMPLOYEE BENEFIT PLANS - Salary Continuation Plan (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 employee | Dec. 31, 2014 employee
EMPLOYEE BENEFIT PLANS |  |  |  |  |
Defined Benefit Plan, Executive Officers Added to Plan | employee |  |  |  | 2 | 1
Defined Benefit Plan, Benefit Term after Retirement or Death | 15 years |  |  |  |
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract] |  |  |  |  |
Defined Benefit Plan, Benefit Obligation | $ 1,600 |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | $ 577 | $ 545 | $ 432 |  |

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