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PENSION PLANS (Defined Benefit Retirement Plan) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Change in benefit obligation        
Annuity purchase   $ 0 $ 9,390  
Change in plan assets, at fair value:        
Annuity purchase   $ 0 9,390  
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 beginning of year   $ 23,677 33,067  
Interest cost   926 1,374 $ 1,383
Actuarial (gains) losses   752 1,039  
Benefits paid   (1,884) (2,413)  
Benefit obligation at end of the year   23,471 23,677 33,067
Change in plan assets, at fair value:        
Fair value of plan assets at beginning of year   18,539 26,321  
Actual return on plan assets   2,177 1,021  
Employer contributions   4,000 3,000  
Benefits paid   (1,884) (2,413)  
Fair value of plan assets at end of year   22,832 18,539 26,321
Funded status at end of year   (639) (5,138)  
Amounts recognized in AOCI        
Net actuarial losses   $ (8,472) $ (10,052)  
Benefit obligation actuarial assumptions:        
Weighted average discount rate   3.60% 4.10%  
Components of net periodic benefit cost        
Interest cost   $ 926 $ 1,374 1,383
Expected return on plan assets   (1,036) (1,542) (1,893)
Amortization of net actuarial losses   1,191 1,548 1,577
Settlement   0 3,847 0
Net periodic benefit cost   $ 1,081 $ 5,227 $ 1,067
Net periodic cost actuarial assumptions        
Weighted average discount rate   4.10% 4.30% 4.00%
Expected long-term rate of return on plan assets   5.50% 6.00% 7.00%
SERPs        
Change in benefit obligation        
Benefit obligation at beginning of year   $ 10,292 $ 10,651  
Interest cost   429 465 $ 440
Actuarial (gains) losses   1,708 (598)  
Benefits paid   (1,210) (226)  
Benefit obligation at end of the year   11,219 10,292 10,651
Change in plan assets, at fair value:        
Fair value of plan assets at beginning of year   0 0  
Employer contributions   1,209 226  
Benefits paid   (1,209) (226)  
Fair value of plan assets at end of year   0 0 0
Funded status at end of year   (11,219) (10,292)  
Amounts recognized in AOCI        
Net transition obligation   (100) (112)  
Prior service cost   (49) (66)  
Net actuarial losses   (2,163) (701)  
Total amounts recognized in AOCI   $ (2,312) $ (879)  
Benefit obligation actuarial assumptions:        
Weighted average discount rate   3.50% 4.10%  
Components of net periodic benefit cost        
Interest cost   $ 429 $ 465 440
Amortization of net actuarial (gains) losses   102 51 111
Amortization of net transition obligation   18 17 16
Amortization of net actuarial losses   18 18 18
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement $ 100 138 0 0
Net periodic benefit cost   $ 705 $ 551 $ 585
Net periodic cost actuarial assumptions        
Weighted average discount rate   4.10% 4.40% 4.10%