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EMPLOYEE BENEFIT PLANS - Amounts Recognized in Other Comprehensive Income (Loss) (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]      
Net actuarial loss 178 145  
Settlement charge 0 0  
Prior service cost (credit) 893 748  
Total recognized in net periodic benefit cost and other comprehensive loss 1,071 893  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
After tax components of accumulated other comprehensive loss, not yet recognized in net periodic pension cost 822    
Expected cash contributions 0    
Expected amortization from accumulated other comprehensive loss into net periodic pension cost 0    
Non-qualified Supplemental Executive Retirement Plan      
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial loss 202 220  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Accumulated other comprehensive loss at beginning of the year (pre-tax) 619 414  
Actuarial loss 202 220  
Amortization of actuarial loss (42) (15)  
Accumulated other comprehensive loss at end of year (pre-tax) 779 $ 619 $ 414
After tax components of accumulated other comprehensive loss, not yet recognized in net periodic pension cost 597    
Expected amortization from accumulated other comprehensive loss into net periodic pension cost $ 43