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Consolidated Statements Of Changes In Stockholders' Equity (USD $)
In Thousands, except Share data, unless otherwise specified
Preferred Stock [Member]
Common Stock [Member]
Capital Surplus [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss), Net [Member]
Total
Balance at Dec. 31, 2010 $ 64,203 $ 38 $ 171,364 $ 120,361 $ 2,597  
Balance, shares at Dec. 31, 2010   37,983,027        
Issuance of additional shares pursuant to various stock plans     6      
Issuance of additional shares pursuant to various stock plans, shares   10,300        
Stock-based compensation     27      
Preferred stock cash dividends accrued (5%)       (837)    
Accretion of preferred stock discount 238     (238)    
Comprehensive income:            
Net income       6,746   6,746
Other comprehensive income (loss):            
Change in unrealized gain on securities available for sale, net of tax         (164)  
Change in unrealized gain on interest-only strips, net of tax         2  
Change in unrealized gain (loss) on interest-rate caps, net of tax         (7)  
Balance at Mar. 31, 2011 64,441 38 171,397 126,032 2,428  
Balance, shares at Mar. 31, 2011   37,993,327        
Balance at Dec. 31, 2011 119,350 78 524,644 142,909 8,958 795,939
Balance, shares at Dec. 31, 2011   77,984,252        
Issuance of additional shares pursuant to various stock plans     81      
Issuance of additional shares pursuant to various stock plans, shares   12,139        
Tax effects of stock plan                 
Stock-based compensation     398      
Preferred stock cash dividends accrued (5%)       (1,525)    
Accretion of preferred stock discount 344     (344)    
Comprehensive income:            
Net income       23,934   23,934
Other comprehensive income (loss):            
Change in unrealized gain on securities available for sale, net of tax             (656)  
Change in unrealized gain on interest-only strips, net of tax             2  
Change in unrealized gain (loss) on interest-rate caps, net of tax             (7)  
Balance at Mar. 31, 2012 $ 119,694 $ 78 $ 525,123 $ 164,974 $ 8,297 $ 818,166
Balance, shares at Mar. 31, 2012   77,996,391