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COMPONENTS OF QUARTERLY AND YEAR TO DATE NET PERIODIC BENEFIT COSTS (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Qualified Pension Plan        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost, benefits earned during the period $ 0 $ 0 $ 0 $ 0
Interest cost on projected benefit obligation 383 396 1,139 1,189
Expected return on plan assets (629) (596) (1,887) (1,786)
Amortization of unrecognized transition obligation 0 0 0 0
Amortization of unrecognized prior service cost 0 0 0 0
Amortization of unrecognized net loss 0 6 0 17
Net periodic pension benefit (246) (194) (748) (580)
Supplemental Pension Plan        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost, benefits earned during the period 0 0 0 0
Interest cost on projected benefit obligation 11 12 33 35
Expected return on plan assets 0 0 0 0
Amortization of unrecognized prior service cost 0 0 0 0
Amortization of unrecognized net loss 3 2 9 6
Net periodic pension benefit 14 14 42 41
Postretirement Plan, Medical and Life        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost, benefits earned during the period 0 0 0 0
Interest cost on projected benefit obligation 1 1 3 3
Expected return on plan assets 0 0 0 0
Amortization of unrecognized prior service cost 0 0 0 0
Amortization of unrecognized net loss 4 5 12 14
Net periodic pension benefit $ 5 $ 6 $ 15 $ 17