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PENSION PLANS (Defined Benefit Retirement Plan) (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Nov. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pension Plan        
PENSION PLANS        
Consecutive period of service considered for highest average annual salaries for calculation of benefits under the reactivated plan   60 months    
Increase in unrecognized prior service cost due to reactivation of the plan   $ 5,900    
Amortization period of increase in prior service cost   13 years    
Change in benefit obligation        
Benefit obligation at beginning of year   $ 21,919 $ 21,603  
Interest cost   485 641 $ 828
Actuarial (gains) losses   (427) 1,288  
Benefits paid   (1,557) (1,613)  
Benefit obligation at end of the year   20,420 21,919 21,603
Change in plan assets, at fair value:        
Fair value of plan assets at beginning of year   21,153 21,309  
Actual return on plan assets   1,189 1,457  
Benefits paid   (1,557) (1,613)  
Fair value of plan assets at end of year   20,785 21,153 21,309
Funded status at end of year   365 (766)  
Amounts recognized in AOCI        
Net actuarial losses   $ (4,699) $ (6,467)  
Benefit obligation actuarial assumptions:        
Weighted-average discount rate   2.40% 2.30%  
Components of net periodic benefit cost        
Interest cost   $ 485 $ 641 828
Expected return on plan assets   (549) (920) (996)
Amortization of net actuarial losses   701 909 1,101
Net periodic benefit cost   $ 637 $ 630 $ 933
Net periodic cost actuarial assumptions        
Weighted-average discount rate   2.30% 3.10% 4.20%
Expected long-term rate of return on plan assets   2.70% 4.50% 5.30%
Pension Plan | Minimum        
PENSION PLANS        
Estimated settlement expense $ 4,500      
Pension Plan | Maximum        
PENSION PLANS        
Estimated settlement expense $ 6,500      
SERPs        
Change in benefit obligation        
Benefit obligation at beginning of year   $ 12,740 $ 11,971  
Interest cost   264 341 $ 430
Actuarial (gains) losses   (398) 737  
Benefits paid   (309) (309)  
Benefit obligation at end of the year   12,297 12,740 11,971
Change in plan assets, at fair value:        
Fair value of plan assets at beginning of year   0 0  
Employer contributions   309 309  
Benefits paid   (309) (309)  
Fair value of plan assets at end of year   0 0 0
Funded status at end of year   (12,297) (12,740)  
Amounts recognized in AOCI        
Net transition obligation   (26) (44)  
Prior service cost   0 0  
Net actuarial losses   (2,337) (3,070)  
Total amounts recognized in AOCI   $ (2,363) $ (3,114)  
Benefit obligation actuarial assumptions:        
Weighted-average discount rate   2.50% 2.10%  
Components of net periodic benefit cost        
Interest cost   $ 264 $ 341 430
Amortization of net actuarial (gains) losses   335 251 16
Amortization of net transition obligation   18 18 18
Amortization of net actuarial losses   0 14 18
Net periodic benefit cost   $ 617 $ 624 $ 482
Net periodic cost actuarial assumptions        
Weighted-average discount rate   2.10% 3.10% 4.20%