XML 70 R58.htm IDEA: XBRL DOCUMENT v3.21.1
COMPONENTS OF QUARTERLY AND YEAR TO DATE NET PERIODIC BENEFIT COSTS (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
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 272 322
Expected return on plan assets (673) (610)
Amortization of unrecognized transition obligation 0 0
Amortization of unrecognized prior service cost 0 0
Amortization of unrecognized net loss 37 49
Net periodic pension benefit (364) (239)
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 10
Expected return on plan assets 0 0
Amortization of unrecognized prior service cost 0 0
Amortization of unrecognized net loss 5 3
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 2 2
Expected return on plan assets 0 0
Amortization of unrecognized prior service cost (55) (55)
Amortization of unrecognized net loss 13 25
Net periodic pension benefit $ (40) $ (28)