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Components of Net Periodic Benefit Cost (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Components of Net Periodic Benefit Cost          
Expected contribution to ESOP         $ 1,500,000
Pension Benefits
          
Components of Net Periodic Benefit Cost          
Service cost 1,218,000 775,000 2,436,000 1,550,000  
Interest cost 917,000 824,000 1,833,000 1,648,000  
Expected return on plan assets (815,000) (964,000) (1,629,000) (1,929,000)  
Net amortization of prior service cost 41,000 (4,000) 83,000 (9,000)  
Net amortization of net (gain) loss 567,000 161,000 1,135,000 321,000  
Net Periodic Benefit Cost 1,928,000 792,000 3,858,000 1,581,000  
Expected contribution in next fiscal year         3,800,000
Contributions made by employer     1,400,000    
Post-Retirement Health Benefits
          
Components of Net Periodic Benefit Cost          
Service cost 15,000 27,000 30,000 55,000  
Interest cost 43,000 60,000 86,000 120,000  
Amortization of transition obligation 15,000 15,000 30,000 30,000  
Net Periodic Benefit Cost 73,000 102,000 146,000 205,000  
Expected contribution in next fiscal year         225,000
Contributions made by employer     $ 103,000