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Stock Option Plan (Summarized Information Concerning Currently Outstanding And Exercisable Options) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Range of Exercise Prices ($), Lower limit $ 6.71  
Range of Exercise Prices ($), Higher limit $ 12.79  
Number of Options 175,366 216,886
Remaining Contractual Life 2 years 1 month 6 days  
Weighted Average Exercise Price ($) $ 9.66 $ 8.83
Group 1 [Member]
    
Range of Exercise Prices ($), Lower limit $ 6.71  
Range of Exercise Prices ($), Higher limit $ 7.73  
Number of Options 60,541  
Remaining Contractual Life 1 year 3 months 18 days  
Weighted Average Exercise Price ($) $ 7.63  
Group 2 [Member]
    
Range of Exercise Prices ($), Lower limit $ 9.55  
Range of Exercise Prices ($), Higher limit $ 10.84  
Number of Options 45,623  
Remaining Contractual Life 1 year 10 months 24 days  
Weighted Average Exercise Price ($) $ 9.62  
Group 3 [Member]
    
Range of Exercise Prices ($), Lower limit $ 11.45  
Range of Exercise Prices ($), Higher limit $ 12.79  
Number of Options 69,202  
Remaining Contractual Life 3 years  
Weighted Average Exercise Price ($) $ 11.46