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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, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 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 8,000 34,000
Interest cost 26,000 28,000 52,000 56,000
Benefits paid     (68,000) (68,000)
Benefit obligation at end of period (1,946,000) (1,870,000) (1,946,000) (1,870,000)
Funded Status of Plan [Abstract]        
Benefit obligation at end of period (1,946,000) (1,870,000) (1,946,000) (1,870,000)
Accrued benefit cost at end of period (1,946,000) (1,870,000) (1,946,000) (1,870,000)
Components of Net Periodic Benefit Cost [Abstract]        
Service cost 4,000 17,000 8,000 34,000
Interest cost 26,000 28,000 52,000 56,000
Amortization of unrecognized transition obligation 0 7,000 5,000 14,000
Amortization of accumulated losses (4,000) (3,000) 4,000 6,000
Net periodic benefit cost $ 34,000 $ 55,000 $ 69,000 $ 110,000