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COMPONENTS OF QUARTERLY AND YEAR TO DATE NET PERIODIC BENEFIT COSTS
 9 Months Ended
Sep. 30, 2023
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,
 2023202220232022
Qualified Pension Plan
Service cost, benefits earned during the period$— $— $— $— 
Interest cost on projected benefit obligation396 282 1,189 848 
Expected return on plan assets(596)(720)(1,786)(2,141)
Amortization of unrecognized transition obligation— — — — 
Amortization of unrecognized prior service cost— — — — 
Amortization of unrecognized net loss6 — 17 — 
Net periodic pension benefit$(194)$(438)$(580)$(1,293)
Supplemental Pension Plan    
Service cost, benefits earned during the period$— $— $— $— 
Interest cost on projected benefit obligation12 8 35 25 
Expected return on plan assets— — — — 
Amortization of unrecognized prior service cost— — — — 
Amortization of unrecognized net loss2 6 6 15 
Net periodic supplemental pension cost$14 $14 $41 $40 
Postretirement Plan, Medical and Life    
Service cost, benefits earned during the period$— $— $— $— 
Interest cost on projected benefit obligation1 1 3 3 
Expected return on plan assets— — — — 
Amortization of unrecognized prior service cost— — — — 
Amortization of unrecognized net loss5 10 14 26 
Net periodic postretirement, medical and life benefit$6 $11 $17 $29