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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
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2009
Change in Benefit Obligations [Roll Forward]        
Benefit obligation at beginning of year $ (1,954) $ (1,848)   $ (1,796)
Service cost 21 16 12  
Interest cost 86 107 112  
Benefits paid (107) (103) (134)  
Actuarial (gain) loss (475) 86 62  
Benefit obligation at end of period (1,479) (1,954) (1,848) (1,796)
Funded Status of Plan [Abstract]        
Benefit obligation at end of period (1,479) (1,954) (1,848) (1,796)
Unamortized prior service cost (289) 186 100  
Unrecognized transition obligation 0 5 34  
Accrued benefit cost at end of period (1,768) (1,763) (1,714)  
Weighted average discount rate as of December 31 0.050 0.045 0.065  
Components of Net Periodic Benefit Cost [Abstract]        
Service cost 21 16 12  
Interest cost 86 107 112  
Amortization of unrecognized transition obligation 5 29 29  
Amortization of accumulated losses 0 0 11  
Net periodic benefit cost $ 112 $ 152 $ 164  
Weighted average discount rate for net periodic cost 0.045 0.065 0.065