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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Basic earnings per share      
Income available to common stockholders plus assumed exercise of options to purchase common stock, Net Income $ 6,928 $ 5,122 $ 25,367
Income available to common stockholders, Shares 12,502,378 9,336,727  
Income available to common stockholders, Per Share $ 0.55 $ 0.55  
Effect of dilutive securities      
Options to purchase common stock, Shares 278,130 279,770  
Diluted earnings per share      
Income available to common stockholders plus assumed exercise of options to purchase common stock, Net Income $ 6,928 $ 5,122 $ 25,367
Income available to common stockholders plus assumed exercise of options to purchase common stock, Shares 12,780,508 9,616,497  
Income available to common stockholders plus assumed exercise of options to purchase common stock, Per Share $ 0.54 $ 0.53