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Employee Benefit Plans, Accumulated Post-Retirement Benefit Obligation, Funded Status, and Net Periodic Benefit Cost (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Change in Benefit Obligations [Roll Forward]        
Benefit obligation at beginning of year     $ 1,848,000 $ 1,796,000
Service cost 17,000 4,000 34,000 8,000
Interest cost 28,000 29,000 56,000 58,000
Benefits paid     (68,000) (78,000)
Benefit obligation at end of period 1,870,000 1,784,000 1,870,000 1,784,000
Funded Status of Plan [Abstract]        
Benefit obligation at end of period (1,870,000) (1,784,000) (1,870,000) (1,784,000)
Accrued benefit cost at end of period (1,870,000) (1,784,000) (1,870,000) (1,784,000)
Components of Net Periodic Benefit Cost [Abstract]        
Service cost 17,000 4,000 34,000 8,000
Interest cost 28,000 29,000 56,000 58,000
Amortization of unrecognized transition obligation 7,000 7,000 14,000 14,000
Amortization of accumulated losses 3,000 5,000 6,000 10,000
Net periodic benefit cost $ 55,000 $ 45,000 $ 110,000 $ 90,000