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COMPONENTS OF QUARTERLY AND YEAR TO DATE NET PERIODIC BENEFIT COSTS
 6 Months Ended
Jun. 30, 2020
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 
 June 30,		Six Months Ended 
 June 30,
 2020201920202019
Qualified Pension Plan
Service cost, benefits earned during the period$—  $—  $—  $—  
Interest cost on projected benefit obligation322  378  644  757  
Expected return on plan assets(610) (553) (1,220) (1,107) 
Amortization of unrecognized transition obligation—  —  —  —  
Amortization of unrecognized prior service cost—  —  —  —  
Amortization of unrecognized net loss49  49  98  98  
Net periodic pension benefit$(239) $(126) $(478) $(252) 
Supplemental Pension Plan    
Service cost, benefits earned during the period$—  $—  $—  $—  
Interest cost on projected benefit obligation10  13  20  26  
Expected return on plan assets—  —  —  —  
Amortization of unrecognized prior service cost—  —  —  —  
Amortization of unrecognized net loss3  1  6  2  
Net periodic supplemental pension cost$13  $14  $26  $28  
Postretirement Plan, Medical and Life    
Service cost, benefits earned during the period$—  $—  $—  $—  
Interest cost on projected benefit obligation2  3  4  6  
Expected return on plan assets—  —  —  —  
Amortization of unrecognized prior service cost(55) (55) (110) (110) 
Amortization of unrecognized net loss25  23  50  46  
Net periodic postretirement, medical and life benefit$(28) $(29) $(56) $(58)