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COMPONENTS OF QUARTERLY AND YEAR TO DATE NET PERIODIC BENEFIT COSTS (Tables)
3 Months Ended
Mar. 31, 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 
 March 31,
 
 
2020
 
2019
Qualified Pension Plan
 
 
 
 
Service cost, benefits earned during the period
 
$

 
$

Interest cost on projected benefit obligation
 
322

 
379

Expected return on plan assets
 
(610
)
 
(554
)
Amortization of unrecognized transition obligation
 

 

Amortization of unrecognized prior service cost
 

 

Amortization of unrecognized net loss
 
49

 
49

Net periodic pension benefit
 
$
(239
)
 
$
(126
)
 
 
 
 
 
Supplemental Pension Plan
 
 

 
 

Service cost, benefits earned during the period
 
$

 
$

Interest cost on projected benefit obligation
 
10

 
13

Expected return on plan assets
 

 

Amortization of unrecognized prior service cost
 

 

Amortization of unrecognized net loss
 
3

 
1

Net periodic supplemental pension cost
 
$
13

 
$
14

 
 
 
 
 
Postretirement Plan, Medical and Life
 
 

 
 

Service cost, benefits earned during the period
 
$

 
$

Interest cost on projected benefit obligation
 
2

 
3

Expected return on plan assets
 

 

Amortization of unrecognized prior service cost
 
(55
)
 
(55
)
Amortization of unrecognized net loss
 
25

 
23

Net periodic postretirement, medical and life benefit
 
$
(28
)
 
$
(29
)