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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Supplemental Employee Retirement Plan [Member]        
Net periodic pension cost        
Service cost $ 116 $ 98 $ 348 $ 296
Interest cost 116 131 346 392
Recognized net actuarial loss 155 61 467 183
Net period benefit cost 387 290 1,161 871
Other Postretirement Benefit Plan        
Net periodic pension cost        
Service cost 7 12 21 36
Interest cost 31 37 92 111
Recognized net actuarial loss 20 7 59 19
Amortization of prior service credit (6) (6) (18) (18)
Net period benefit cost $ 52 $ 50 $ 154 $ 148