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Stock Incentive Plans (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summary of stock option activity      
Outstanding Beginning Balance, Number of Options 671,294 399,569 315,319
Outstanding Beginning Balance, Weighted Average Exercise Price $ 14.48     
Options granted, Number of Options 7,500 289,200 87,000
Options granted, Weighted Average Exercise Price $ 17.55 $ 16.06 $ 13.43
Options exercised, Number of Options (131,997) (7,475) (2,750)
Options cancelled , Number of Options 8,100 10,000  
Options exercised, Weighted Average Exercise Price $ 13.98 $ 7.24 $ 6.29
Options cancelled , Weighted Average Exercise Price $ 13.85 $ 14.39  
Outstanding Ending Balance, Number of Options 538,697 671,294 399,569
Outstanding Ending Balance , Weighted Average Exercise Price $ 14.66 $ 14.48  
Available for grant at December 31, 2012 586,900