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
	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