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COMPONENTS OF QUARTERLY AND YEAR TO DATE NET PERIODIC BENEFIT COSTS (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
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 322 379
Expected return on plan assets (610) (554)
Amortization of unrecognized transition obligation 0 0
Amortization of unrecognized prior service cost 0 0
Amortization of unrecognized net loss 49 49
Net periodic pension benefit (239) (126)
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 10 13
Expected return on plan assets 0 0
Amortization of unrecognized prior service cost 0 0
Amortization of unrecognized net loss 3 1
Net periodic pension benefit 13 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 2 3
Expected return on plan assets 0 0
Amortization of unrecognized prior service cost (55) (55)
Amortization of unrecognized net loss 25 23
Net periodic pension benefit $ (28) $ (29)