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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Change in benefit obligation        
Annuity purchase       $ 9,400
Change in plan assets, at fair value:        
Annuity purchase       9,400
Components of net periodic benefit cost        
Settlement       3,800
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   $ 23,471 $ 23,677  
Interest cost   796 926 1,374
Actuarial (gains) losses   (1,714) 752  
Benefits paid   (1,807) (1,884)  
Benefit obligation at end of the year   20,746 23,471 23,677
Change in plan assets, at fair value:        
Fair value of plan assets at beginning of year   22,832 18,539  
Actual return on plan assets   (1,151) 2,177  
Employer contributions   0 4,000  
Benefits paid   (1,807) (1,884)  
Fair value of plan assets at end of year   19,874 22,832 18,539
Funded status at end of year   (872) (639)  
Amounts recognized in AOCI        
Net actuarial losses   $ (8,137) $ (8,472)  
Benefit obligation actuarial assumptions:        
Weighted average discount rate   4.20% 3.60%  
Components of net periodic benefit cost        
Interest cost   $ 796 $ 926 1,374
Expected return on plan assets   (1,206) (1,036) (1,542)
Amortization of net actuarial losses   979 1,191 1,548
Settlement   0 0 3,847
Net periodic benefit cost   $ 569 $ 1,081 $ 5,227
Net periodic cost actuarial assumptions        
Weighted average discount rate   3.60% 4.10% 4.30%
Expected long-term rate of return on plan assets   5.50% 5.50% 6.00%
SERPs        
Change in benefit obligation        
Benefit obligation at beginning of year   $ 11,219 $ 10,292  
Interest cost   389 429 $ 465
Actuarial (gains) losses   (907) 1,708  
Benefits paid   (346) (1,210)  
Benefit obligation at end of the year   10,355 11,219 10,292
Change in plan assets, at fair value:        
Fair value of plan assets at beginning of year   0 0  
Employer contributions   346 1,209  
Benefits paid   (346) (1,209)  
Fair value of plan assets at end of year   0 0 0
Funded status at end of year   (10,355) (11,219)  
Amounts recognized in AOCI        
Net transition obligation   (82) (100)  
Prior service cost   (31) (49)  
Net actuarial losses   (1,082) (2,163)  
Total amounts recognized in AOCI   $ (1,195) $ (2,312)  
Benefit obligation actuarial assumptions:        
Weighted average discount rate   4.20% 3.50%  
Components of net periodic benefit cost        
Interest cost   $ 389 $ 429 465
Amortization of net actuarial (gains) losses   174 102 51
Amortization of net transition obligation   18 18 17
Amortization of net actuarial losses   18 18 18
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement $ 100 0 138 0
Net periodic benefit cost   $ 599 $ 705 $ 551
Net periodic cost actuarial assumptions        
Weighted average discount rate   3.50% 4.10% 4.40%