COMPONENTS OF QUARTERLY AND YEAR TO DATE NET PERIODIC BENEFIT COSTS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Qualified Pension Plan
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost, benefits earned during the period	$ 0	$ 0
Interest cost on projected benefit obligation	396	282
Expected return on plan assets	(596)	(713)
Amortization of unrecognized transition obligation	0	0
Amortization of unrecognized prior service cost	0	0
Amortization of unrecognized net loss	6	0
Net periodic pension benefit	(194)	(431)
Supplemental Pension Plan
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost, benefits earned during the period	0	0
Interest cost on projected benefit obligation	12	8
Expected return on plan assets	0	0
Amortization of unrecognized prior service cost	0	0
Amortization of unrecognized net loss	2	5
Net periodic pension benefit	14	13
Postretirement Plan, Medical and Life
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost, benefits earned during the period	0	0
Interest cost on projected benefit obligation	1	1
Expected return on plan assets	0	0
Amortization of unrecognized prior service cost	0	0
Amortization of unrecognized net loss	5	9
Net periodic pension benefit	$ 6	$ 10