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PENSION PLANS (Defined Benefit Retirement Plan) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
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 $ 20,746 $ 23,471  
Interest cost 828 796 $ 926
Actuarial (gains) losses 1,677 (1,714)  
Benefits paid (1,648) (1,807)  
Benefit obligation at end of the year 21,603 20,746 23,471
Change in plan assets, at fair value:      
Fair value of plan assets at beginning of year 19,874 22,832  
Actual return on plan assets 3,083 (1,151)  
Benefits paid (1,648) (1,807)  
Fair value of plan assets at end of year 21,309 19,874 22,832
Funded status at end of year (294) (872)  
Amounts recognized in AOCI      
Net actuarial losses $ (6,625) $ (8,137)  
Benefit obligation actuarial assumptions:      
Weighted average discount rate 3.10% 4.20%  
Components of net periodic benefit cost      
Interest cost $ 828 $ 796 926
Expected return on plan assets (996) (1,206) (1,036)
Amortization of net actuarial losses 1,101 979 1,191
Net periodic benefit cost $ 933 $ 569 $ 1,081
Net periodic cost actuarial assumptions      
Weighted average discount rate 4.20% 3.60% 4.10%
Expected long-term rate of return on plan assets 5.30% 5.50% 5.50%
SERPs      
Change in benefit obligation      
Benefit obligation at beginning of year $ 10,355 $ 11,219  
Interest cost 430 389 $ 429
Actuarial (gains) losses 1,517 (907)  
Benefits paid (331) (346)  
Benefit obligation at end of the year 11,971 10,355 11,219
Change in plan assets, at fair value:      
Fair value of plan assets at beginning of year 0 0  
Employer contributions 331 346  
Benefits paid (331) (346)  
Fair value of plan assets at end of year 0 0 0
Funded status at end of year (11,971) (10,355)  
Amounts recognized in AOCI      
Net transition obligation (64) (82)  
Prior service cost (14) (31)  
Net actuarial losses (2,583) (1,082)  
Total amounts recognized in AOCI $ (2,661) $ (1,195)  
Benefit obligation actuarial assumptions:      
Weighted average discount rate 3.00% 4.20%  
Components of net periodic benefit cost      
Interest cost $ 430 $ 389 429
Amortization of net actuarial (gains) losses 16 174 102
Amortization of net transition obligation 18 18 18
Amortization of net actuarial losses 18 18 18
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement 0 0 138
Net periodic benefit cost $ 482 $ 599 $ 705
Net periodic cost actuarial assumptions      
Weighted average discount rate 4.20% 3.50% 4.10%