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Employee Benefit Plans, Accumulated Post-Retirement Benefit Obligation, Funded Status, and Net Periodic Benefit Cost (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Change in Benefit Obligations [Roll Forward]      
Benefit obligation at beginning of year $ 1,848,000 $ 1,796,000 $ 1,962,000
Service cost 16,000 12,000 15,000
Interest cost 107,000 112,000 117,000
Benefits paid (103,000) (134,000) (136,000)
Actuarial (gain) loss 86,000 62,000 (162,000)
Benefit obligation at end of period 1,954,000 1,848,000 1,796,000
Funded Status of Plan [Abstract]      
Benefit obligation at end of period (1,954,000) (1,848,000) (1,796,000)
Unamortized prior service cost 186,000 100,000 49,000
Unrecognized transition obligation 5,000 34,000 63,000
Accrued benefit cost at end of period (1,763,000) (1,714,000) (1,684,000)
Weighted average discount rate as of December 31 0.045 0.065 0.065
Components of Net Periodic Benefit Cost [Abstract]      
Service cost 16,000 12,000 15,000
Interest cost 107,000 112,000 117,000
Amortization of unrecognized transition obligation 29,000 29,000 29,000
Amortization of prior service credit 0 0 0
Amortization of accumulated losses 0 11,000 22,000
Net periodic benefit cost $ 152,000 $ 164,000 $ 183,000
Weighted average discount rate for net periodic cost 0.045 0.065 0.065