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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Supplemental Employee Retirement Plan [Member]        
Net periodic pension cost        
Service cost $ 111 $ 84 $ 223 $ 168
Interest cost 122 113 244 225
Recognized net actuarial loss 140 62 280 124
Net period benefit cost 373 259 747 517
Other Postretirement Benefit Plan        
Net periodic pension cost        
Service cost 11 13 23 26
Interest cost 33 36 66 72
Recognized net actuarial loss 14 10 27 20
Amortization of prior service credit (6) (6) (12) (12)
Net period benefit cost $ 52 $ 53 $ 104 $ 106