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Net Income Per Common Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Basic and diluted net income per common share        
Income available to common stockholders - Income $ 13,860 $ 12,553 $ 39,594 $ 34,023
Income available to common stockholders - Shares 15,174,755 15,210,090 15,155,035 15,316,218
Income available to common stockholders - Per Share Amount $ 0.91 $ 0.82 $ 2.61 $ 2.22
Effect of stock options - Shares 272,639 261,569 276,063 286,905
Income available to common stockholders plus assumed exercises of stock options - Income $ 13,860 $ 12,553 $ 39,954 $ 34,023
Income available to common stockholders plus assumed exercises of stock options - Shares 15,447,394 15,471,659 15,431,098 15,603,123
Income available to common stockholders plus assumed exercises of stock options - Per Share Amount $ 0.90 $ 0.81 $ 2.57 $ 2.18