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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
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 322 379 966 1,136
Expected return on plan assets (610) (554) (1,830) (1,661)
Amortization of unrecognized transition obligation 0 0 0 0
Amortization of unrecognized prior service cost 0 0 0 0
Amortization of unrecognized net loss 49 49 147 147
Net periodic pension benefit (239) (126) (717) (378)
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 10 13 30 39
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 1 9 3
Net periodic pension benefit 13 14 39 42
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 2 4 6 10
Expected return on plan assets 0 0 0 0
Amortization of unrecognized prior service cost (55) (55) (165) (165)
Amortization of unrecognized net loss 25 22 75 68
Net periodic pension benefit $ (28) $ (29) $ (84) $ (87)