STOCKHOLDERS' EQUITY AND EARNINGS PER SHARE (Details) (USD $)	12 Months Ended			0 Months Ended	1 Months Ended	12 Months Ended		0 Months Ended		3 Months Ended								12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	May 01, 2013 Series A Non-Cumulative Perpetual Convertible Preferred Stock	Apr. 30, 2008 Series A Non-Cumulative Perpetual Convertible Preferred Stock	Dec. 31, 2013 Series A Non-Cumulative Perpetual Convertible Preferred Stock	Dec. 31, 2012 Series A Non-Cumulative Perpetual Convertible Preferred Stock	Jul. 17, 2013 Common Stock	Jan. 23, 2013 Common Stock	Dec. 31, 2013 Common Stock	Sep. 30, 2013 Common Stock	Jun. 30, 2013 Common Stock	Mar. 31, 2013 Common Stock	Dec. 31, 2012 Common Stock	Sep. 30, 2012 Common Stock	Jun. 30, 2012 Common Stock	Mar. 31, 2012 Common Stock	Dec. 31, 2013 Common Stock	Dec. 31, 2012 Common Stock
Class of Stock
Number of shares issued during the period					200,000
Preferred stock dividend rate (as a percent)					8.00%
Preferred stock liquidation preference (in dollars per share)					$ 1,000
Proceeds from issuance of convertible preferred stock					$ 194,100,000
Preferred shares converted				85,710
Common stock issued on conversion of convertible preferred stock				5,594,080
Amount of stock repurchase approved by the Board of Directors								100,000,000	200,000,000
Purchase of treasury stock pursuant to the Stock Repurchase Program, shares	8,026,807	9,068,105
Weighted average price of shares repurchased (in dollars per share)	$ 24.89	$ 22.02
Total cost of repurchase of treasury shares	200,000,000	199,900,000
Quarterly Dividends
Dividend per share (in dollars per share)						$ 20.00	$ 20.00
Preferred stock cash dividends paid						3,400,000	6,900,000
Dividend per share (in dollars per share)	$ 0.60	$ 0.40	$ 0.16							$ 0.15	$ 0.15	$ 0.15	$ 0.15	$ 0.10	$ 0.10	$ 0.10	$ 0.10
Common stock cash dividends paid																		$ 83,300,000	$ 57,600,000