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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY      
Unrealized net holding gains (losses) arising during the period, tax (benefit) (in dollars) $ 3,298 $ 550 $ (620)
Reclassification adjustment, tax (benefit) (in dollars) (70) (404) (52)
Other comprehensive income (loss), tax (benefit) (in dollars) $ 3,228 $ 146 $ (672)
Conversion of Series B preferred stock to common stock, preferred stock shares converted 318.6225    
Conversion of Series B preferred stock to common stock, common stock shares obtained 7,497,000    
Repurchase of Series T preferred stock 100,000    
Issuance of shares, preferred stock and warrants     100,000
Issuance of shares, preferred stock 72,664.0000 318.6225  
Issuance of shares of common stock as a result of a registered direct offering   12,718,635 30,525,000
Issuance of shares of treasury stock for employee stock purchase plan 3,879    
Issuance of shares of treasury stock for option exercise and related tax benefit     1,282
Cash dividends, common stock (in dollars per share) $ 0.16 $ 0.16 $ 0.40
Stock dividends, restricted stock units (in dollars per share) $ 0.16 $ 0.08