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COMPONENTS OF QUARTERLY AND YEAR TO DATE NET PERIODIC BENEFIT COSTS (Tables)
6 Months Ended
Jun. 30, 2015
COMPONENTS OF QUARTERLY AND YEAR TO DATE NET PERIODIC BENEFIT COSTS [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,
 
  
2015
  
2014
  
2015
  
2014
 
Qualified Pension Plan
        
Service cost, benefits earned during the period
 
$
353
  
$
271
  
$
707
  
$
542
 
Interest cost on projected benefit obligation
  
457
   
435
   
914
   
870
 
Expected return on plan assets
  
(824
)
  
(793
)
  
(1,647
)
  
(1,586
)
Amortization of unrecognized transition obligation
  
-
   
-
   
-
   
-
 
Amortization of unrecognized prior service cost
  
3
   
2
   
5
   
4
 
Amortization of unrecognized net loss
  
369
   
160
   
737
   
320
 
  Net periodic pension cost
 
$
358
  
$
75
  
$
716
  
$
150
 
                 
Supplemental Pension Plan
                
Service cost, benefits earned during the period
 
$
11
  
$
10
  
$
22
  
$
20
 
Interest cost on projected benefit obligation
  
12
   
13
   
24
   
26
 
Expected return on plan assets
  
-
   
-
   
-
   
-
 
Amortization of unrecognized prior service cost
  
-
   
-
   
-
   
-
 
Amortization of unrecognized net loss
  
13
   
5
   
26
   
10
 
  Net periodic supplemental pension cost
 
$
36
  
$
28
  
$
72
  
$
56
 
                 
Postretirement Plan, Medical and Life
                
Service cost, benefits earned during the period
 
$
12
  
$
11
  
$
24
  
$
22
 
Interest cost on projected benefit obligation
  
16
   
18
   
32
   
36
 
Expected return on plan assets
  
-
   
-
   
-
   
-
 
Amortization of unrecognized prior service cost
  
(24
)
  
(24
)
  
(48
)
  
(48
)
Amortization of unrecognized net loss
  
2
   
-
   
4
   
-
 
  Net periodic postretirement, medical and life cost
 
$
6
  
$
5
  
$
12
  
$
10