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COMPONENTS OF QUARTERLY AND YEAR TO DATE NET PERIODIC BENEFIT COSTS
 9 Months Ended
Sep. 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 
 September 30,		Nine Months Ended 
 September 30,
 2021202020212020
Qualified Pension Plan
Service cost, benefits earned during the period$— $— $— $— 
Interest cost on projected benefit obligation271 322 813 966 
Expected return on plan assets(673)(610)(2,019)(1,830)
Amortization of unrecognized transition obligation— — — — 
Amortization of unrecognized prior service cost— — — — 
Amortization of unrecognized net loss38 49 113 147 
Net periodic pension benefit$(364)$(239)$(1,093)$(717)
Supplemental Pension Plan    
Service cost, benefits earned during the period$— $— $— $— 
Interest cost on projected benefit obligation8 10 24 30 
Expected return on plan assets— — — — 
Amortization of unrecognized prior service cost— — — — 
Amortization of unrecognized net loss5 3 15 9 
Net periodic supplemental pension cost$13 $13 $39 $39 
Postretirement Plan, Medical and Life    
Service cost, benefits earned during the period$— $— $— $— 
Interest cost on projected benefit obligation1 2 5 6 
Expected return on plan assets— — — — 
Amortization of unrecognized prior service cost(55)(55)(165)(165)
Amortization of unrecognized net loss14 25 41 75 
Net periodic postretirement, medical and life benefit$(40)$(28)$(119)$(84)