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PENSION PLANS (Defined Benefit Retirement Plan) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
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 $ 36,330 $ 32,183  
Interest cost 1,383 1,485 $ 1,370
Actuarial (gains) losses (2,228) 5,709  
Benefits paid (2,418) (3,047)  
Benefit obligation at the end of the year 33,067 36,330 32,183
Change in plan assets      
Fair value of plan assets at the beginning of the year 27,891 27,782  
Actual return on plan assets (152) 1,813  
Employer contributions 1,000 1,343  
Benefits paid (2,418) (3,047)  
Fair value of plan assets at the end of the year 26,321 27,891 27,782
Funded status at end of year (6,746) (8,439)  
Amounts recognized in AOCI      
Net actuarial losses $ (13,887) $ (15,647)  
Benefit obligation actuarial assumptions      
Weighted average discount rate 4.30% 4.00%  
Components of net periodic benefit cost      
Interest cost $ 1,383 $ 1,485 1,370
Expected return on plan assets (1,893) (1,924) (1,762)
Amortization of net actuarial losses 1,577 1,068 2,390
Net periodic benefit cost $ 1,067 $ 629 $ 1,998
Net periodic cost actuarial assumptions      
Weighted average discount rate 4.00% 4.70% 4.00%
Expected long-term rate of return on plan assets 7.00% 7.00% 7.50%
SERPs      
Change in benefit obligation      
Benefit obligation at the beginning of the year $ 10,930 $ 9,107  
Interest cost 440 450 $ 411
Actuarial (gains) losses (504) 1,588  
Benefits paid (215) (215)  
Benefit obligation at the end of the year 10,651 10,930 9,107
Change in plan assets      
Fair value of plan assets at the beginning of the year 0 0  
Employer contributions 215 215  
Benefits paid (215) (215)  
Fair value of plan assets at the end of the year 0 0 0
Funded status at end of year 10,651 10,930  
Amounts recognized in AOCI      
Net transition obligation (129) (147)  
Prior service cost (84) (101)  
Net actuarial losses (1,353) (1,965)  
Total amounts recognized in AOCI $ (1,566) $ (2,213)  
Benefit obligation actuarial assumptions      
Weighted average discount rate 4.40% 4.10%  
Components of net periodic benefit cost      
Interest cost $ 440 $ 450 411
Amortization of net transition obligation 16 17 17
Amortization of prior service cost 18 18 18
Amortization of net actuarial losses 111 2 71
Net periodic benefit cost $ 585 $ 487 $ 517
Net periodic cost actuarial assumptions      
Weighted average discount rate 4.10% 5.00% 4.20%