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EMPLOYEE BENEFIT PLANS - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total 401(k) expense | $ 1,100,000 | $ 1,000,000 | $ 970,000
Split-dollar life insurance agreement |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accrued liability | 834,000 | 671,000 |
Salary continuation agreement expense | 163,000 | 57,000 | 9,000
Net benefit |  |  | $ 57,000
Certain prior executives and senior officers | Salary continuation agreement |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accrued liability | 8,100,000 | 7,300,000 |
Salary continuation agreement expense | 779,000 | 752,000 |
Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
After tax components of accumulated other comprehensive loss, not yet recognized in net periodic pension cost | 684,000 |  |
Expected cash contributions | 0 |  |
Expected amortization from accumulated other comprehensive loss into net periodic pension cost | 0 |  |
Net benefit | $ (307,000) | (391,000) |
Pension Plans | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target asset allocation | 49.00% |  |
Pension Plans | Fixed-income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target asset allocation | 51.00% |  |
Non-qualified Supplemental Executive Retirement Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
After tax components of accumulated other comprehensive loss, not yet recognized in net periodic pension cost | $ 474,000 |  |
Expected amortization from accumulated other comprehensive loss into net periodic pension cost | 42,000 |  |
Net benefit | $ 118,000 | $ 131,000 |

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