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Components of Quarterly and Year-to-Date Net Periodic Benefit Costs (Tables)
9 Months Ended
Sep. 30, 2012
Components of Quarterly and Year-to-Date Net Periodic Benefit Costs [Abstract]  
Components of net periodic benefit costs
   
Nine Months Ended
  
Three Months Ended
 
   
September 30,
  
September 30,
  
September 30,
  
September 30,
 
   
2012
  
2011
  
2012
  
2011
 
Qualified Pension
            
Service cost, benefits earned during the period
 $970,053  $777,402  $323,351  $259,134 
Interest cost on projected benefit obligation
  1,218,330   1,178,868   406,110   392,956 
Expected return on plan assets
  (1,990,479 )  (1,757,019 )  (663,493 )  (585,673 )
Amortization of unrecognized transition obligation
  -   -   -   - 
Amortization of unrecognized prior service cost
  10,392   22,410   3,464   7,470 
Amortization of unrecognized net loss
  991,704   507,339   330,568   169,113 
  Net periodic pension expense
 $1,200,000  $729,000  $400,000  $243,000 
                  
Supplemental Pension
                
Service cost, benefits earned during the period
 $26,076  $22,968  $8,692  $7,656 
Interest cost on projected benefit obligation
  38,320   40,330   12,773   13,443 
Expected return on plan assets
  -   -   -   - 
Amortization of unrecognized prior service cost
  -   -   -   - 
Amortization of unrecognized net loss
  14,940   7,098   4,980   2,366 
  Net periodic supplemental pension expense
 $79,336  $70,396  $26,445  $23,465 
                  
Postretirement, Medical and Life
                
Service cost, benefits earned during the period
 $26,250  $24,750  $8,750  $8,250 
Interest cost on projected benefit obligation
  54,000   56,250   18,000   18,750 
Expected return on plan assets
  -   -   -   - 
Amortization of unrecognized prior service cost
  (72,750 )  (72,750 )  (24,250 )  (24,250 )
Amortization of unrecognized net gain
  -   -   -   - 
  Net periodic postretirement, medical and life expense
 $7,500  $8,250  $2,500  $2,750