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EMPLOYEE BENEFITS - Narrative (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employee stock ownership plan, maximum employer contribution as a percentage of participant's qualified compensation | 5.00% |  |
Employee stock ownership plan, total contributions accrued or paid | $ 737 | $ 692 |
Employee stock ownership plan, shares held under plan (in shares) | 1,304,471 |  |
Employee stock ownership plan, unallocated shares (in shares) | 0 |  |
Cash surrender value of life insurance | $ 36,367 |  | $ 35,510
Bonus expense | 2,153 | 728 |
Executive Incentive Retirement Plan | Postretirement Life Insurance | Nonqualified Plan | Unfunded Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Cash surrender value of life insurance | 36,367 |  | 35,510
Plan cost | 471 | $ 400 | 592
Plan obligation | $ 4,781 |  | $ 4,383

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