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STOCKHOLDERS' EQUITY (Details) (USD $) | 9 Months Ended |  | 1 Months Ended | 3 Months Ended |  | 1 Months Ended |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  | 9 Months Ended | 1 Months Ended |
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Sep. 30, 2011 | Sep. 30, 2010 | Dec. 31, 2010 | Apr. 30, 2008 Series A Non-Cumulative Perpetual Convertible Preferred Stock [Member] | Sep. 30, 2011 Series A Non-Cumulative Perpetual Convertible Preferred Stock [Member] | Jul. 20, 2011 Series A Non-Cumulative Perpetual Convertible Preferred Stock [Member] | Dec. 29, 2010 Series B Fixed Rate Cumulative Perpetual Preferred Stock [Member] | Dec. 05, 2008 Series B Fixed Rate Cumulative Perpetual Preferred Stock [Member] | Mar. 30, 2010 Series C Cumulative Convertible Preferred Stock [Member] | Nov. 05, 2009 Series C Cumulative Convertible Preferred Stock [Member] | Sep. 30, 2011 Common Stock [Member] | Sep. 30, 2011 Common Stock [Member] | Dec. 31, 2007 Common Stock [Member] | Jul. 20, 2011 Common Stock [Member] | Mar. 30, 2010 Common Stock [Member] | Nov. 05, 2009 Common Stock [Member] | Sep. 30, 2011 Preferred Stock, Series A [Member] | Jan. 26, 2011 Warrants [Member] | Dec. 31, 2008 Warrants [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of preferred shares issued (in shares) | 200,000 |  | 200,000 | 200,000 |  |  |  | 306,546 |  | 335,047 |  |  |  |  |  |  |  |  |
Preferred stock dividend rate (in hundredths) |  |  |  | 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 common stock shares convertible from each share of convertible preferred stock (in shares) |  |  |  | 64.9942 |  |  |  |  | 110.74197 |  |  |  |  |  |  |  |  |  |
Convertible preferred stock conversion price premium per share of common stock based on closing price of common stock (in dollars per share) |  |  |  | $ 15.39 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion premium of the convertible preferred stock based on the closing price of the common stock (in hundredths) |  |  |  | 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 |  | 85,741 |  | 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 |  |  |  |  |  |  |  |  |  |  |  |
Value of preferred stock issued | 83,027,000 |  | 83,058,000 |  |  |  |  |  |  |  |  |  |  |  |  | 500,000,000 |  |  |
Number of shares of convertible preferred stock converted to common shares in the private placement (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 335,047 |  |  |
Number of shares of common stock issued in the private placement (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,247,012 |  |  |
Number of shares of common stock issued upon conversion of convertible preferred stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 37,103,734 |  |  |  |
Preferred stock to common stock conversion price (in dollars per share) |  |  |  |  |  |  |  |  | $ 9.03 |  |  |  |  |  |  |  |  |  |
Amount of stock repurchase approved by the Board of Directors |  |  |  |  |  |  |  |  |  |  |  |  | 80,000,000 |  |  |  |  |  |
Dividend declaration date |  |  |  |  |  | July 20, 2011 |  |  |  |  |  |  |  | July 20, 2011 |  |  |  |  |
Dividend per share (in dollars per share) |  |  |  |  |  | $ 20.00 |  |  |  |  |  |  |  | $ 0.05 |  |  |  |  |
Dividend payment date |  |  |  |  |  | August 1, 2011 |  |  |  |  |  |  |  | August 24, 2011 |  |  |  |  |
Dividend record date |  |  |  |  |  | July 15, 2011 |  |  |  |  |  |  |  | August 10, 2011 |  |  |  |  |
Preferred stock cash dividends paid |  |  |  |  | 1,700,000 |  |  |  |  |  |  |  |  |  |  |  | 5,100,000 |  |
Common stock cash dividends paid |  |  |  |  |  |  |  |  |  |  | 7,500,000 | 16,400,000 |  |  |  |  |  |  |
Common shares outstanding at end of period (in shares) | 148,961,927 |  | 148,542,940 |  |  |  |  |  |  |  | 148,961,927 | 148,961,927 |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial price per share of common stock for which the warrants may be exercised (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15.15
Allocated fair value of warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,200,000
Warrants repurchased (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,517,555 |
Cash paid to repurchase warrants | $ 14,500,000 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,500,000 |

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- Definition Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 3, 4, 5, 6, 7, 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 02 -Paragraph 29 + Details
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- Definition The cash inflow from issuance of preferred stocks identified as being convertible into another form of financial instrument, typically the entity's common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition Proceeds from issuance of capital stock which provides for a specific dividend that is paid to the shareholders before any dividends to common stockholders and which takes precedence over common stockholders in the event of liquidation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The amount authorized by an entity's Board of Directors under a stock repurchase plan. + Details
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