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EMPLOYEE BENEFITS - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
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 | $ 383 | $ 343 |
Employee stock ownership plan, shares held under plan (in shares) | 1,227,096 |  | 1,224,697
Employee stock ownership plan, unallocated shares (in shares) | 0 |  | 0
Cash surrender value of life insurance | $ 34,713 |  | $ 34,495
Bonus expense | 478 | 715 | 3,265
Executive Incentive Retirement Plan | Postretirement Life Insurance | Nonqualified Plan | Unfunded Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Cash surrender value of life insurance | 34,713 |  | 34,495
Plan cost | 296 | $ 285 | 602
Plan obligation | $ 4,337 |  | $ 4,081

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