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EMPLOYEE BENEFIT PLANS - Schedule of Net Benefit Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial loss $ 338 $ 350 $ 216
Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Interest cost 282 331  
Expected return on plan assets (708) (638)  
Settlement Charge 0 0  
Net actuarial loss 178 145  
Settlement charge 0 0  
Net periodic pension benefit cost (credit) (426) (307)  
Total recognized in net periodic benefit (credit) cost and other comprehensive income (loss) (248) (162)  
Non-qualified Supplemental Executive Retirement Plan      
Defined Benefit Plan Disclosure [Line Items]      
Interest cost 81 103  
Net actuarial loss 202 220  
Amortization of unrecognized actuarial loss 42 15  
Net periodic pension benefit cost (credit) 123 118  
Total recognized in net periodic benefit (credit) cost and other comprehensive income (loss) $ 160 $ 205