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Stock-Based Compensation (Details) (Stock Option [Member], USD $)
3 Months Ended
Mar. 31, 2013
Stock Option [Member]
 
Shares  
Outstanding at beginning of year 7,163
Granted   
Exercised   
Expired or forfeited   
Outstanding at end of year 7,163
Exercisable at end of year 6,789
Weighted Average Exercise Price  
Outstanding at beginning of year $ 22.34
Granted   
Exercised   
Expired or forfeited   
Outstanding at end of year $ 22.34
Exercisable at end of year $ 21.36
Outstanding 4 years 4 months 24 days
Outstanding 4 years 2 months 12 days
Exercisable at end of year 4 years 2 months 12 days
Aggregate Intrinsic Value  
Outstanding at end of year   
Exercisable at end of year