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EARNINGS PER SHARE (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
EARNINGS PER SHARE        
Net income $ 10,721 $ 11,626 $ 35,011 $ 24,476
Preferred stock dividends, accretion of discount and conversion of preferred stock to common stock       (83,897)
Net income available to common shareholders $ 10,721 $ 11,626 $ 35,011 $ 108,373
Weighted average shares outstanding - basic 41,764,000 41,625,000 41,704,000 33,957,000
SHARE-BASED COMPENSATION        
Dilutive effect of Treasury warrants (in shares) 22,000 14,000 21,000 22,000
Weighted average shares outstanding - diluted 42,016,000 41,672,000 41,961,000 34,272,000
Basic earnings per share (in dollars per share) $ 0.26 $ 0.28 $ 0.84 $ 3.19
Diluted earnings per share (in dollars per share) $ 0.26 $ 0.28 $ 0.83 $ 3.16
Antidilutive securities excluded from the dilutive share calculation (in shares) 300,713 41,724 300,869 41,724
Stock option
        
SHARE-BASED COMPENSATION        
Dilutive effect of share-based compensation arrangements 166,000 14,000 172,000 286,000
Restricted stock awards and units
        
SHARE-BASED COMPENSATION        
Dilutive effect of share-based compensation arrangements 64,000 19,000 64,000 7,000