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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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Change in benefit obligation        
Benefit obligation at beginning of year     $ (1,479) $ (1,954)
Service cost 5 4 10 8
Interest cost 22 26 44 52
Benefits paid     (52) (68)
Benefit obligation at end of period (1,481) (1,946) (1,481) (1,946)
Funded status        
Benefit obligation at end of period (1,481) (1,946) (1,481) (1,946)
Unamortized (gain) loss (289) 182 (289) 182
Accrued benefit cost at end of period (1,770) (1,764) (1,770) (1,764)
Components of net periodic benefit cost        
Service cost 5 4 10 8
Interest cost 22 26 44 52
Amortization of unrecognized transition obligation 0 0 0 5
Amortization of accumulated losses 0 6 0 4
Net periodic benefit cost $ 27 $ 36 $ 54 $ 69