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COMPONENTS OF QUARTERLY AND YEAR TO DATE NET PERIODIC BENEFIT COSTS
 3 Months Ended
Mar. 31, 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 
 March 31,
 20212020
Qualified Pension Plan
Service cost, benefits earned during the period$— $— 
Interest cost on projected benefit obligation272 322 
Expected return on plan assets(673)(610)
Amortization of unrecognized transition obligation— — 
Amortization of unrecognized prior service cost— — 
Amortization of unrecognized net loss37 49 
Net periodic pension benefit$(364)$(239)
Supplemental Pension Plan  
Service cost, benefits earned during the period$— $— 
Interest cost on projected benefit obligation8 10 
Expected return on plan assets— — 
Amortization of unrecognized prior service cost— — 
Amortization of unrecognized net loss5 3 
Net periodic supplemental pension cost$13 $13 
Postretirement Plan, Medical and Life  
Service cost, benefits earned during the period$— $— 
Interest cost on projected benefit obligation2 2 
Expected return on plan assets— — 
Amortization of unrecognized prior service cost(55)(55)
Amortization of unrecognized net loss13 25 
Net periodic postretirement, medical and life benefit$(40)$(28)