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Employee Benefits (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Employee Stock Ownership Plan and Trust (ESOP) [Member]
        
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]        
Shares contributed to ESOP (in shares)     182,000  
Shares released from trust (in shares) 182,500   182,500  
Total balance of share in the ESOP (in shares) 430   430  
Pension benefits [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 45,000 $ 32,000 $ 90,000 $ 65,000
Interest cost 58,000 46,000 117,000 93,000
Amortization of prior service cost 7,000 27,000 14,000 55,000
Actuarial net loss 171,000 66,000 345,000 131,000
Net periodic benefit cost (credit) 281,000 171,000 566,000 344,000
Postretirement benefits [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0 1,000 1,000 2,000
Interest cost 10,000 18,000 19,000 43,000
Amortization of prior service cost (1,087,000) (1,223,000) (2,174,000) (2,447,000)
Actuarial net loss 605,000 769,000 1,216,000 1,417,000
Net periodic benefit cost (credit) (472,000) (435,000) (938,000) (985,000)
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]        
Contributions by employer on behalf of employees     500,000  
Estimated future employer contributions in current fiscal year     1,000,000  
Supplemental Executive Retirement Plan [Member]
        
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]        
Employer discretionary contribution amount     $ 500,000