EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Supplemental Employee Retirement Plan [Member]
Net periodic pension cost
Service cost	$ 126	$ 116
Interest cost	97	115
Recognized net actuarial loss	195	156
Net period benefit cost	418	387
Other Postretirement Benefit Plan
Net periodic pension cost
Service cost	7	7
Interest cost	26	31
Recognized net actuarial loss	29	19
Amortization of prior service credit	(6)	(6)
Net period benefit cost	$ 56	$ 51