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COMPONENTS OF QUARTERLY AND YEAR TO DATE NET PERIODIC BENEFIT COSTS (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
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 282 272
Expected return on plan assets (713) (673)
Amortization of unrecognized transition obligation 0 0
Amortization of unrecognized prior service cost 0 0
Amortization of unrecognized net loss 0 37
Net periodic pension benefit (431) (364)
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 8 8
Expected return on plan assets 0 0
Amortization of unrecognized prior service cost 0 0
Amortization of unrecognized net loss 5 5
Net periodic pension benefit 13 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 2
Expected return on plan assets 0 0
Amortization of unrecognized prior service cost 0 (55)
Amortization of unrecognized net loss 9 13
Net periodic pension benefit $ 10 $ (40)