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EMPLOYEE BENEFIT PLANS - Changes in obligations and assets (Details) - Defined Benefit Pension Items - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
CHANGE IN BENEFIT OBLIGATION:      
Benefit obligation at beginning of year $ 50,287 $ 54,861  
Service cost 1,419 1,708 $ 1,676
Interest cost 1,462 894 1,281
Actuarial (gain) loss (9,787) 273  
Settlements (7,541) (6,516)  
Benefits paid (934) (933)  
Benefit obligation at end of year 34,906 50,287 54,861
CHANGE IN PLAN ASSETS:      
Fair value of plan assets at beginning of year 70,432 58,447  
Actual return on plan assets (9,700) 11,434  
Employer contributions 4,000 8,000  
Settlements (7,541) (6,516)  
Benefits paid (934) (933)  
Fair value of plan assets at end of year 56,257 70,432 $ 58,447
Funded status of the plan $ 21,351 $ 20,145