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PENSION PLANS (Defined Benefit Retirement Plan) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Change in benefit obligation      
Annuity purchase $ 9,390 $ 0  
Change in plan assets      
Annuity purchase 9,390 0  
Components of net periodic benefit cost      
Settlement $ 3,847    
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 the beginning of the year $ 33,067 36,330  
Interest cost 1,374 1,383 $ 1,485
Actuarial (gains) losses 1,039 (2,228)  
Benefits paid (2,413) (2,418)  
Benefit obligation at the end of the year 23,677 33,067 36,330
Change in plan assets      
Fair value of plan assets at the beginning of the year 26,321 27,891  
Actual return on plan assets 1,021 (152)  
Employer contributions 3,000 1,000  
Benefits paid (2,413) (2,418)  
Fair value of plan assets at the end of the year 18,539 26,321 27,891
Funded status at end of year (5,138) (6,746)  
Amounts recognized in AOCI      
Net actuarial losses $ (10,052) $ (13,887)  
Benefit obligation actuarial assumptions      
Weighted average discount rate 4.10% 4.30%  
Components of net periodic benefit cost      
Interest cost $ 1,374 $ 1,383 1,485
Expected return on plan assets (1,542) (1,893) (1,924)
Amortization of net actuarial losses 1,548 1,577 1,068
Settlement 3,847 0 0
Net periodic benefit cost $ 5,227 $ 1,067 $ 629
Net periodic cost actuarial assumptions      
Weighted average discount rate 4.30% 4.00% 4.70%
Expected long-term rate of return on plan assets 6.00% 7.00% 7.00%
SERPs      
Change in benefit obligation      
Benefit obligation at the beginning of the year $ 10,651 $ 10,930  
Interest cost 465 440 $ 450
Actuarial (gains) losses (598) (504)  
Benefits paid (226) (215)  
Benefit obligation at the end of the year 10,292 10,651 10,930
Change in plan assets      
Fair value of plan assets at the beginning of the year 0 0  
Employer contributions 226 215  
Benefits paid (226) (215)  
Fair value of plan assets at the end of the year 0 0 0
Funded status at end of year (10,292) (10,651)  
Amounts recognized in AOCI      
Net transition obligation (112) (129)  
Prior service cost (66) (84)  
Net actuarial losses (701) (1,353)  
Total amounts recognized in AOCI $ (879) $ (1,566)  
Benefit obligation actuarial assumptions      
Weighted average discount rate 4.10% 4.40%  
Components of net periodic benefit cost      
Interest cost $ 465 $ 440 450
Amortization of net transition obligation 17 16 17
Amortization of prior service cost 18 18 18
Amortization of net actuarial losses 51 111 2
Net periodic benefit cost $ 551 $ 585 $ 487
Net periodic cost actuarial assumptions      
Weighted average discount rate 4.40% 4.10% 5.00%