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COMPONENTS OF QUARTERLY AND YEAR TO DATE NET PERIODIC BENEFIT COSTS (Tables)
9 Months Ended
Sep. 30, 2018
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,
 
 
2018
 
2017
 
2018
 
2017
Qualified Pension Plan
 
 
 
 
 
 
 
 
Service cost, benefits earned during the period
 
$

 
$

 
$

 
$

Interest cost on projected benefit obligation
 
385

 
403

 
1,154

 
1,209

Expected return on plan assets
 
(826
)
 
(785
)
 
(2,478
)
 
(2,355
)
Amortization of unrecognized transition obligation
 

 

 

 

Amortization of unrecognized prior service cost
 

 

 

 

Amortization of unrecognized net loss
 
43

 
58

 
130

 
174

Net periodic pension benefit
 
$
(398
)
 
$
(324
)
 
$
(1,194
)
 
$
(972
)
 
 
 
 
 
 
 
 
 
Supplemental Pension Plan
 
 

 
 

 
 

 
 

Service cost, benefits earned during the period
 
$

 
$

 
$

 
$

Interest cost on projected benefit obligation
 
12

 
12

 
36

 
36

Expected return on plan assets
 

 

 

 

Amortization of unrecognized prior service cost
 

 

 

 

Amortization of unrecognized net loss
 
1

 
1

 
5

 
3

Net periodic supplemental pension cost
 
$
13

 
$
13

 
$
41

 
$
39

 
 
 
 
 
 
 
 
 
Postretirement Plan, Medical and Life
 
 

 
 

 
 

 
 

Service cost, benefits earned during the period
 
$

 
$

 
$

 
$

Interest cost on projected benefit obligation
 
4

 
3

 
11

 
11

Expected return on plan assets
 

 

 

 

Amortization of unrecognized prior service cost
 
(55
)
 
(55
)
 
(165
)
 
(165
)
Amortization of unrecognized net loss
 
28

 
29

 
83

 
87

Net periodic postretirement, medical and life benefit
 
$
(23
)
 
$
(23
)
 
$
(71
)
 
$
(67
)