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STOCKHOLDERS' EQUITY AND EARNINGS PER SHARE (Details) (USD $) | 12 Months Ended | 1 Months Ended | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  |  | 12 Months Ended | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  | 1 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Apr. 30, 2008 Series A Non-Cumulative Perpetual Convertible Preferred Stock | Dec. 31, 2011 Series A Non-Cumulative Perpetual Convertible Preferred Stock | Dec. 31, 2010 Series A Non-Cumulative Perpetual Convertible Preferred Stock | Apr. 23, 2008 Series A Non-Cumulative Perpetual Convertible Preferred Stock | Dec. 31, 2010 Series B Fixed Rate Cumulative Perpetual Preferred Stock | Dec. 31, 2008 Series B Fixed Rate Cumulative Perpetual Preferred Stock | Dec. 31, 2010 Series B Fixed Rate Cumulative Perpetual Preferred Stock | Dec. 29, 2010 Series B Fixed Rate Cumulative Perpetual Preferred Stock | Dec. 05, 2008 Series B Fixed Rate Cumulative Perpetual Preferred Stock | Dec. 31, 2011 Series A Non-Cumulative Perpetual Convertible Preferred Stock and Series B Fixed Rate Cumulative Perpetual Preferred Stock | Dec. 31, 2010 Series A Non-Cumulative Perpetual Convertible Preferred Stock and Series B Fixed Rate Cumulative Perpetual Preferred Stock | Jul. 31, 2009 Private Sales of Common Stock | Jul. 14, 2009 Private Sales of Common Stock customer | Jul. 31, 2009 Public Offering of Common Stock | Jul. 24, 2009 Public Offering of Common Stock | Mar. 31, 2010 Series C Cumulative Convertible Preferred Stock | Nov. 30, 2009 Series C Cumulative Convertible Preferred Stock | Mar. 30, 2010 Series C Cumulative Convertible Preferred Stock | Nov. 05, 2009 Series C Cumulative Convertible Preferred Stock | Jan. 31, 2012 Common Stock | Mar. 31, 2010 Common Stock | Nov. 30, 2009 Common Stock | Dec. 31, 2011 Common Stock | Sep. 30, 2011 Common Stock | Jun. 30, 2011 Common Stock | Mar. 31, 2011 Common Stock | Dec. 31, 2010 Common Stock | Sep. 30, 2010 Common Stock | Jun. 30, 2010 Common Stock | Mar. 31, 2010 Common Stock | Dec. 31, 2011 Common Stock | Dec. 31, 2010 Common Stock | Mar. 30, 2010 Common Stock | Nov. 30, 2009 Common Stock and Series C Preferred Stock
Class of Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued during the period (in shares) |  |  |  | 200,000 |  |  |  |  | 306,546 |  |  |  |  |  | 5,000,000 |  | 11,000,000 |  |  | 335,047 |  |  |  |  | 18,247,012 |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividend rate (as a percent) |  |  |  | 8.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock liquidation preference (in dollars per share) |  |  |  | $ 1,000 |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of convertible preferred stock |  |  |  | $ 194,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of preferred shares converted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 335,047 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock shares convertible from each share of convertible preferred stock (in shares) |  |  |  | 64.9942 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 110.74197 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible preferred stock conversion price per share |  |  |  | $ 15.39 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion premium of the convertible preferred stock based on the closing price of the common stock (as a percent) |  |  |  | 22.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Closing price of common stock at issuance of convertible preferred stock (in dollars per share) |  |  |  |  |  |  | $ 12.56 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares outstanding (in shares) |  |  |  |  | 85,710 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of preferred stock issued to the U.S. Treasury |  |  |  |  |  |  |  |  | 306,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid to repurchase preferred stock plus accrued and unpaid dividends |  |  |  |  |  |  |  | 308,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuance discount |  |  |  |  |  |  |  |  |  |  | 17,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends and accretion |  |  |  |  |  |  |  | 56,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid |  |  |  |  |  |  |  | 31,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accretion of stock issuance discount |  |  |  |  |  |  |  | 25,200,000 |  | 25,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Savings in annual dividend |  |  |  |  |  |  |  | 15,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of customers who purchased newly issued shares of the Company's common stock during the private sale of common stock during the period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued | 156,798,011 | 155,743,241 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issue price per share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.50 |  | $ 6.35 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issue of shares |  |  | 80,328,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 76,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of shares by underwriters (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,650,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of private placement |  |  | 192,454,000 |  |  |  |  |  |  |  |  |  |  |  | 26,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000,000
Number of common shares issued upon conversion of Series C convertible preferred stock in the private placement (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 37,103,734 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock conversion price per share upon conversion of Series C convertible preferred stock in the private placement (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9.03 |
Amount of stock repurchase approved by the Board of Directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  |  |  |  | $ 20.00 | $ 20.00 |  |  |  | $ 12.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | $ 0.16 | $ 0.04 | $ 0.05 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.05 | $ 0.05 | $ 0.05 | $ 0.01 | $ 0.01 | $ 0.01 | $ 0.01 | $ 0.01 |  |  |  |
Preferred stock cash dividends paid |  |  |  |  |  |  |  |  |  |  |  |  | 6,900,000 | 22,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock cash dividends paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,900,000 | 5,500,000 |  |
Accumulated Other Comprehensive (Loss)/Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated other comprehensive loss, net of tax | (33,940,000) | (12,414,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized loss on securities available for sale | (34,800,000) | (13,900,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign exchange translation adjustment | $ 908,000 | $ 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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