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Stock Options and Restricted Stock (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Shares        
Share outstanding, Beginning balance 919,348 1,270,698 1,468,855  
Granted           
Exercised (86,800) (338,350) (153,157)  
Cancelled, forfeited, or expired, Shares    (13,000) (45,000)  
Share outstanding, Ending balance 832,548 919,348 1,270,698 1,468,855
Shares exercisable, Ending balance 779,948 832,948 1,118,498  
Weighted- Average Exercise Price        
Weighted- Average Exercise Price, Beginning balance $ 10.37 $ 10.28 $ 10.34  
Granted           
Exercised $ 9.00 $ 9.87 $ 9.50  
Cancelled, forfeited, or expired, Weighted average exercise price         
Weighted- Average Exercise Price, Ending balance $ 10.51 $ 10.37 $ 10.28 $ 10.34
Weighted- Average Exercise Price, Exercisable Ending balance $ 10.08 $ 9.70 $ 9.49  
Weighted- Average Remaining Contractual Life (in years)        
Weighted- Average Remaining Contractual Life (in years), Beginning balance 4 years 7 months 6 days 5 years 6 months 6 years 4 months 24 days 7 years 4 months 24 days
Weighted- Average Remaining Contractual Life (in years), Exercisable 4 years 4 months 24 days 5 years 2 months 12 days 6 years 1 month 6 days  
Weighted- Average Remaining Contractual Life (in years), Ending balance 4 years 7 months 6 days 5 years 6 months 6 years 4 months 24 days 7 years 4 months 24 days