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EMPLOYEE BENEFIT PLANS - Funded status (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Supplemental Benefit Plan      
Change in benefit obligations      
Benefit obligations at beginning of period $ 381 $ 392  
Interest cost 7 4 $ 9
Actuarial (gain) loss (50) (15)  
Benefit obligations at end of period 338 381 392
Change in plan assets      
Funded status at period end (338) (381)  
Accumulated benefit obligation 338 381  
Postretirement Health Benefit Plan      
Change in benefit obligations      
Benefit obligations at beginning of period 16,992 18,751  
Service cost 156 192 187
Interest cost 441 427 576
Actuarial (gain) loss (4,392) (1,736)  
Benefits paid (663) (642)  
Benefit obligations at end of period 12,534 16,992 $ 18,751
Change in plan assets      
Employer contributions 663 642  
Benefits paid (663) (642)  
Funded status at period end (12,534) (16,992)  
Accumulated benefit obligation $ 12,534 $ 16,992