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Employee Benefit Plans, Accumulated Post-Retirement Benefit Obligation, Funded Status, and Net Periodic Benefit Cost (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Change in Benefit Obligations [Roll Forward]    
Benefit obligation at beginning of year $ (1,954) $ (1,848)
Service cost 4 17
Interest cost 26 28
Benefits paid (34) (34)
Benefit obligation at end of period (1,950) (1,859)
Funded Status of Plan [Abstract]    
Benefit obligation at end of period (1,950) (1,859)
Accrued benefit cost at end of period (1,950) (1,859)
Components of Net Periodic Benefit Cost [Abstract]    
Service cost 4 17
Interest cost 26 28
Amortization of unrecognized transition obligation 5 7
Amortization of accumulated losses 0 3
Net periodic benefit cost $ 35 $ 55