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COMPONENTS OF QUARTERLY AND YEAR TO DATE NET PERIODIC BENEFIT COSTS (Tables)
3 Months Ended
Mar. 31, 2021
Retirement Benefits [Abstract]  
Components of 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 obligation10 
Expected return on plan assets— — 
Amortization of unrecognized prior service cost— — 
Amortization of unrecognized net loss
Net periodic supplemental pension cost$13 $13 
Postretirement Plan, Medical and Life  
Service cost, benefits earned during the period$— $— 
Interest cost on projected benefit obligation
Expected return on plan assets— — 
Amortization of unrecognized prior service cost(55)(55)
Amortization of unrecognized net loss13 25 
Net periodic postretirement, medical and life benefit$(40)$(28)