COMPONENTS OF QUARTERLY AND YEAR TO DATE NET PERIODIC BENEFIT COSTS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
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	378	396
Expected return on plan assets	(629)	(596)
Amortization of unrecognized transition obligation	0	0
Amortization of unrecognized prior service cost	0	0
Amortization of unrecognized net loss	0	6
Net periodic pension benefit	(251)	(194)
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	11	12
Expected return on plan assets	0	0
Amortization of unrecognized prior service cost	0	0
Amortization of unrecognized net loss	3	2
Net periodic pension benefit	14	14
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	4	5
Net periodic pension benefit	$ 5	$ 6