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Earnings Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Summary of numerator and denominator of the basic and fully diluted earnings per common share        
Net Income, shares (Numerator) $ 7,262 $ 2,301 $ 14,230 $ 3,094
Net Income, shares (Denominator)            
Preferred stock dividends (63) (361) (244) (378)
Preferred stock dividends, shares (Denominator)            
Less: Income attributable to participating, income (Numerator) (87)   105  
Basic Earnings Per Share        
Income allocated to common stockholders, income (Numerator) 7,199 1,940 13,986 2,716
Income allocated to common stockholders, shares (Denominator) 8,325 6,071 7,326 6,121
Income allocated to common stockholders -basic earning per share $ 0.85 $ 0.32 $ 1.89 $ 0.44
Diluted Earnings Per Share        
Income available to common stockholders and assumed conversions, income (Numerator) 7,175 2,301 14,125 3,094
Income available to common stockholders and assumed conversions, shares (Denominator) 9,651 7,730 8,814 7,215
Diluted earnings per common share $ 0.74 $ 0.30 $ 1.60 $ 0.43
Warrant [Member]
        
Effect of Dilutive Securities        
Dilutive Securities, shares (Denominator) 406   303  
Stock options [Member]
        
Effect of Dilutive Securities        
Dilutive Securities, income (Numerator)            
Dilutive Securities, shares (Denominator) 215 411 229 425
Convertible preferred stock [Member]
        
Effect of Dilutive Securities        
Dilutive Securities, income (Numerator) $ 63 $ 361 $ 244 $ 378
Dilutive Securities, shares (Denominator) 705 1,248 956 669