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COMPONENTS OF QUARTERLY AND YEAR TO DATE NET PERIODIC BENEFIT COSTS (Tables)
6 Months Ended
Jun. 30, 2019
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 
 June 30,
 
Six Months Ended 
 June 30,
 
 
2019
 
2018
 
2019
 
2018
Qualified Pension Plan
 
 
 
 
 
 
 
 
Service cost, benefits earned during the period
 
$

 
$

 
$

 
$

Interest cost on projected benefit obligation
 
378

 
384

 
757

 
769

Expected return on plan assets
 
(553
)
 
(826
)
 
(1,107
)
 
(1,652
)
Amortization of unrecognized transition obligation
 

 

 

 

Amortization of unrecognized prior service cost
 

 

 

 

Amortization of unrecognized net loss
 
49

 
44

 
98

 
87

Net periodic pension benefit
 
$
(126
)
 
$
(398
)
 
$
(252
)
 
$
(796
)
 
 
 
 
 
 
 
 
 
Supplemental Pension Plan
 
 

 
 

 
 

 
 

Service cost, benefits earned during the period
 
$

 
$

 
$

 
$

Interest cost on projected benefit obligation
 
13

 
12

 
26

 
24

Expected return on plan assets
 

 

 

 

Amortization of unrecognized prior service cost
 

 

 

 

Amortization of unrecognized net loss
 
1

 
2

 
2

 
4

Net periodic supplemental pension cost
 
$
14

 
$
14

 
$
28

 
$
28

 
 
 
 
 
 
 
 
 
Postretirement Plan, Medical and Life
 
 

 
 

 
 

 
 

Service cost, benefits earned during the period
 
$

 
$

 
$

 
$

Interest cost on projected benefit obligation
 
3

 
4

 
6

 
7

Expected return on plan assets
 

 

 

 

Amortization of unrecognized prior service cost
 
(55
)
 
(55
)
 
(110
)
 
(110
)
Amortization of unrecognized net loss
 
23

 
27

 
46

 
55

Net periodic postretirement, medical and life benefit
 
$
(29
)
 
$
(24
)
 
$
(58
)
 
$
(48
)