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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Supplemental Employee Retirement Plan [Member]        
Net periodic pension cost        
Service cost $ 98 $ 112 $ 296 $ 335
Interest cost 131 122 392 366
Recognized net actuarial loss 61 140 183 420
Net period benefit cost 290 374 871 1,121
Other Postretirement Benefit Plan        
Net periodic pension cost        
Service cost 12 12 36 35
Interest cost 37 33 111 99
Recognized net actuarial loss 7 12 19 39
Amortization of prior service credit (6) (6) (18) (18)
Net period benefit cost $ 50 $ 51 $ 148 $ 155