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Net Income Per Common Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Basic and diluted net income per common share    
Income available to common stockholders - Income $ 13,372 $ 14,005
Income available to common stockholders - Shares 15,238,701 15,134,606
Income available to common stockholders - Per Share Amount $ 0.88 $ 0.93
Effect of stock options - Shares 243,816 280,905
Income available to common stockholders plus assumed exercises of stock options - Income $ 13,372 $ 14,005
Income available to common stockholders plus assumed exercises of stock options - Shares 15,482,517 15,415,511
Income available to common stockholders plus assumed exercises of stock options - Per Share Amount $ 0.86 $ 0.91