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Employee Benefit Plans, Accumulated Post-Retirement Benefit Obligation, Funded Status, and Net Periodic Benefit Cost (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Change in Benefit Obligations [Roll Forward]        
Benefit obligation at beginning of year     $ (1,954,000) $ (1,848,000)
Service cost 4,000 17,000 12,000 51,000
Interest cost 26,000 28,000 78,000 84,000
Benefits paid     (95,000) (102,000)
Benefit obligation at end of period (1,949,000) (1,881,000) (1,949,000) (1,881,000)
Funded Status of Plan [Abstract]        
Benefit obligation at end of period (1,949,000) (1,881,000) (1,949,000) (1,881,000)
Accrued benefit cost at end of period (1,949,000) (1,881,000) (1,949,000) (1,881,000)
Components of Net Periodic Benefit Cost [Abstract]        
Service cost 4,000 17,000 12,000 51,000
Interest cost 26,000 28,000 78,000 84,000
Amortization of unrecognized transition obligation 0 7,000 5,000 21,000
Amortization of accumulated losses (2,000) (2,000) 6,000 8,000
Net periodic benefit cost $ 32,000 $ 54,000 $ 101,000 $ 164,000