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COMPONENTS OF QUARTERLY AND YEAR TO DATE NET PERIODIC BENEFIT COSTS (Tables)
9 Months Ended
Sep. 30, 2020
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 
 September 30,
Nine Months Ended 
 September 30,
 2020201920202019
Qualified Pension Plan
Service cost, benefits earned during the period$— $— $— $— 
Interest cost on projected benefit obligation322 379 966 1,136 
Expected return on plan assets(610)(554)(1,830)(1,661)
Amortization of unrecognized transition obligation— — — — 
Amortization of unrecognized prior service cost— — — — 
Amortization of unrecognized net loss49 49 147 147 
Net periodic pension benefit$(239)$(126)$(717)$(378)
Supplemental Pension Plan    
Service cost, benefits earned during the period$— $— $— $— 
Interest cost on projected benefit obligation10 13 30 39 
Expected return on plan assets— — — — 
Amortization of unrecognized prior service cost— — — — 
Amortization of unrecognized net loss
Net periodic supplemental pension cost$13 $14 $39 $42 
Postretirement Plan, Medical and Life    
Service cost, benefits earned during the period$— $— $— $— 
Interest cost on projected benefit obligation10 
Expected return on plan assets— — — — 
Amortization of unrecognized prior service cost(55)(55)(165)(165)
Amortization of unrecognized net loss25 22 75 68 
Net periodic postretirement, medical and life benefit$(28)$(29)$(84)$(87)