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STOCKHOLDERS' EQUITY (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
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Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Apr. 30, 2012 Series A Non-Cumulative Perpetual Convertible Preferred Stock | Apr. 30, 2008 Series A Non-Cumulative Perpetual Convertible Preferred Stock | Jun. 30, 2012 Series A Non-Cumulative Perpetual Convertible Preferred Stock | Jun. 30, 2012 Series A Non-Cumulative Perpetual Convertible Preferred Stock | Apr. 23, 2008 Series A Non-Cumulative Perpetual Convertible Preferred Stock | Apr. 30, 2012 Common Stock | Jan. 31, 2012 Common Stock | Jun. 30, 2012 Common Stock | Jun. 30, 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 |  |  |  |  |  | $ 194.1 |  |  |  |  |  |  |
Number of common stock shares convertible from each share of convertible preferred stock (in shares) |  |  |  |  |  | 64.9942 |  |  |  |  |  |  |
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 |  |  |  |  |  |  | 85,710 | 85,710 |  |  |  |  |
Amount of stock repurchase approved by the Board of Directors |  |  |  |  |  |  |  |  |  |  | 200.0 |  |
Quarterly Dividends |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  |  |  |  | $ 20.00 |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | $ 0.10 | $ 0.05 | $ 0.20 | $ 0.06 |  |  |  |  |  | $ 0.10 |  |  |
Common stock cash dividends paid |  |  |  |  |  |  |  |  |  |  |  | 14.5 | 29.3
Preferred stock cash dividends paid |  |  |  |  |  |  | $ 1.7 | $ 3.4 |  |  |  |  |
Purchase of treasury stock pursuant to the Stock Repurchase Program, shares |  |  | 6,784,227 |  |  |  |  |  |  |  |  |  |
Weighted average cost of shares repurchased (in dollars per share) |  |  | $ 22.08 |  |  |  |  |  |  |  |  |  |

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