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COMPONENTS OF QUARTERLY AND YEAR TO DATE NET PERIODIC BENEFIT COSTS (Tables)
3 Months Ended
Mar. 31, 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 March 31,
 
  
2015
  
2014
 
Qualified Pension Plan
    
Service cost, benefits earned during the period
 
$
354
  
$
271
 
Interest cost on projected benefit obligation
  
457
   
435
 
Expected return on plan assets
  
(823
)
  
(793
)
Amortization of unrecognized transition obligation
  
-
   
-
 
Amortization of unrecognized prior service cost
  
2
   
2
 
Amortization of unrecognized net loss
  
368
   
160
 
  Net periodic pension cost
 
$
358
  
$
75
 
         
Supplemental Pension Plan
        
Service cost, benefits earned during the period
 
$
11
  
$
10
 
Interest cost on projected benefit obligation
  
12
   
13
 
Expected return on plan assets
  
-
   
-
 
Amortization of unrecognized prior service cost
  
-
   
-
 
Amortization of unrecognized net loss
  
13
   
5
 
  Net periodic supplemental pension cost
 
$
36
  
$
28
 
         
Postretirement Plan, Medical and Life
        
Service cost, benefits earned during the period
 
$
12
  
$
11
 
Interest cost on projected benefit obligation
  
16
   
18
 
Expected return on plan assets
  
-
   
-
 
Amortization of unrecognized prior service cost
  
(24
)
  
(24
)
Amortization of unrecognized net loss
  
2
   
-
 
  Net periodic postretirement, medical and life cost
 
$
6
  
$
5