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COMPONENTS OF QUARTERLY AND YEAR TO DATE NET PERIODIC BENEFIT COSTS
6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
COMPONENTS OF QUARTERLY AND YEAR TO DATE NET PERIODIC BENEFIT COSTS COMPONENTS OF QUARTERLY AND YEAR TO DATE NET PERIODIC BENEFIT COSTS
The components of net periodic expense for the Corporation’s pension and other benefit plans for the periods indicated are as follows (in thousands):
 Three Months Ended 
 June 30,
Six Months Ended 
 June 30,
 2021202020212020
Qualified Pension Plan
Service cost, benefits earned during the period$— $— $— $— 
Interest cost on projected benefit obligation270 322 542 644 
Expected return on plan assets(673)(610)(1,346)(1,220)
Amortization of unrecognized transition obligation— — — — 
Amortization of unrecognized prior service cost— — — — 
Amortization of unrecognized net loss38 49 75 98 
Net periodic pension benefit$(365)$(239)$(729)$(478)
Supplemental Pension Plan    
Service cost, benefits earned during the period$— $— $— $— 
Interest cost on projected benefit obligation10 16 20 
Expected return on plan assets— — — — 
Amortization of unrecognized prior service cost— — — — 
Amortization of unrecognized net loss10 
Net periodic supplemental pension cost$13 $13 $26 $26 
Postretirement Plan, Medical and Life    
Service cost, benefits earned during the period$— $— $— $— 
Interest cost on projected benefit obligation
Expected return on plan assets— — — — 
Amortization of unrecognized prior service cost(55)(55)(110)(110)
Amortization of unrecognized net loss14 25 27 50 
Net periodic postretirement, medical and life benefit$(39)$(28)$(79)$(56)