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Employee Benefit Plans, Accumulated Post-Retirement Benefit Obligation, Funded Status, and Net Periodic Benefit Cost (Details) (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Change in Benefit Obligations [Roll Forward]    
Benefit obligation at beginning of year $ 1,859,000 $ 1,796,000
Service cost 17,000 4,000
Interest cost 28,000 29,000
Funded Status of Plan [Abstract]    
Accrued benefit cost (1,859,000) (1,790,000)
Components of Net Periodic Benefit Cost [Abstract]    
Service cost 17,000 4,000
Interest cost 28,000 29,000
Amortization of unrecognized transition obligation 7,000 7,000
Amortization of accumulated losses (3,000) (5,000)
Net periodic benefit cost $ 55,000 $ 45,000