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Consolidated Statement of Stockholders' Equity (USD $)
In Thousands, except Share data
Total
USD ($)
Preferred Stock [Member]
Common Stock [Member]
Additional Paid-In Capital [Member]
USD ($)
Retained Income [Member]
USD ($)
Accumulated Other Comprehensive Income [Member]
USD ($)
Beginning Balance at Dec. 31, 2011 $ 63,830     $ 29,636 $ 33,986 $ 208
Beginning Balance, shares at Dec. 31, 2011   1,247,700 6,202,485      
Net income 14,230       14,230  
Change in unrealized gain on available-for-sale securities, net of income taxes 872         872
Exercise of common stock options, shares     145,594      
Exercise of common stock warrants, value 1,375     1,375    
Exercise of common stock warrants, shares     161,642      
Excess tax benefit from stock options exercised 437     437    
Conversion of preferred stock to common stock, share   (655,376) 655,376      
Issuance of restricted stock, shares     200,000      
Issuance of common stock 20,082     20,082    
Issuance of common stock, shares     1,840,000      
Common stock dividends (2,793)       (2,793)  
Preferred stock dividends (244)       (244)  
Stock-based compensation 212     212    
Ending Balance at Jun. 30, 2012 98,001     51,742 45,179 1,080
Ending Balance, shares at Jun. 30, 2012   592,324 9,205,097      
Beginning Balance at Dec. 31, 2012 121,253     63,875 55,758 1,620
Beginning Balance, shares at Dec. 31, 2012   241,182 10,877,537      
Net income 36,622       36,622  
Change in unrealized gain on available-for-sale securities, net of income taxes (723)         (723)
Excess tax benefit from stock options exercised 280     280    
Conversion of preferred stock to common stock, share   (49,432) 49,432      
Issuance of restricted stock, shares     544,000      
Forfeiture of restricted stock, share     (29,080)      
Repurchase of common stock, value (235)     (235)    
Repurchase of common stock, shares     (7,673)      
Common stock dividends (5,020)       (5,020)  
Preferred stock dividends (66)       (66)  
Stock-based compensation 1,474     1,474    
Ending Balance at Jun. 30, 2013 $ 153,585     $ 65,394 $ 87,294 $ 897
Ending Balance, shares at Jun. 30, 2013   191,750 11,434,216