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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, 2014
Mar. 31, 2013
Change in benefit obligation    
Benefit obligation at beginning of year $ (1,479) $ (1,954)
Service cost 5 4
Interest cost 22 26
Benefits paid (26) (34)
Benefit obligation at end of period (1,480) (1,950)
Funded status    
Benefit obligation at end of period (1,480) (1,950)
Unamortized (gain) loss (289) 186
Accrued benefit cost at end of period (1,769) (1,764)
Components of net periodic benefit cost    
Service cost 5 4
Interest cost 22 26
Amortization of unrecognized transition obligation 0 5
Net periodic benefit cost $ 27 $ 35