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EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |
Employee contribution on compensation, maximum (percent) | 100.00% |  |
Employer contribution match on compensation (percent) | 100.00% |  |
Percentage of employees' annual contribution, eligible for employers match (percent) | 4.00% |  |
401(k) plan expense | $ 2,100 | $ 2,100 | $ 2,100
Employee Equity Ownership Plan (EEOP) |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |
Award vesting period | 5 years |  |
Restricted Stock | Employee Equity Ownership Plan (EEOP) |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |
Restricted stock awards issued under Employee Equity Ownership Plan |  |  | 72,561
Unvested restricted stock awards (in shares) | 20,612 |  |
Unrecognized stock-based compensation expense | $ 259 |  |

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