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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
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 271 322 813 966
Expected return on plan assets (673) (610) (2,019) (1,830)
Amortization of unrecognized transition obligation 0 0 0 0
Amortization of unrecognized prior service cost 0 0 0 0
Amortization of unrecognized net loss 38 49 113 147
Net periodic pension benefit (364) (239) (1,093) (717)
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 8 10 24 30
Expected return on plan assets 0 0 0 0
Amortization of unrecognized prior service cost 0 0 0 0
Amortization of unrecognized net loss 5 3 15 9
Net periodic pension benefit 13 13 39 39
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 2 5 6
Expected return on plan assets 0 0 0 0
Amortization of unrecognized prior service cost (55) (55) (165) (165)
Amortization of unrecognized net loss 14 25 41 75
Net periodic pension benefit $ (40) $ (28) $ (119) $ (84)