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STOCKHOLDERS' EQUITY - Summary of Preferred Stock (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Feb. 08, 2016 | Apr. 08, 2015 | Dec. 31, 2017 | Dec. 31, 2016
Class of Stock [Line Items] |  |  |  |
Preferred stock, authorized (in shares) |  |  | 50,000,000 |
Carrying Value |  |  | $ 269,071 | $ 269,071
Series D 7.375% non-cumulative perpetual |  |  |  |
Class of Stock [Line Items] |  |  |  |
Non cumulative preferred stock, dividend rate |  | 7.375% |  |
Series E 7.00% non-cumulative perpetual |  |  |  |
Class of Stock [Line Items] |  |  |  |
Non cumulative preferred stock, dividend rate | 7.00% |  |  |
Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock, authorized (in shares) |  |  | 280,250 | 280,250.00
Preferred stock, shares outstanding (in shares) |  |  | 280,250 | 280,250
Liquidation Preference |  |  | $ 280,250 | $ 280,250
Carrying Value |  |  | $ 269,071 | $ 269,071
Preferred Stock | Series C 8.00% non-cumulative perpetual |  |  |  |
Class of Stock [Line Items] |  |  |  |
Non cumulative preferred stock, dividend rate |  |  | 8.00% | 8.00%
Preferred stock, authorized (in shares) |  |  | 40,250 | 40,250
Preferred stock, shares outstanding (in shares) |  |  | 40,250 | 40,250
Liquidation Preference |  |  | $ 40,250 | $ 40,250
Carrying Value |  |  | $ 37,943 | $ 37,943
Preferred Stock | Series D 7.375% non-cumulative perpetual |  |  |  |
Class of Stock [Line Items] |  |  |  |
Non cumulative preferred stock, dividend rate |  |  | 7.375% | 7.375%
Preferred stock, authorized (in shares) |  |  | 115,000 | 115,000
Preferred stock, shares outstanding (in shares) |  |  | 115,000 | 115,000
Liquidation Preference |  |  | $ 115,000 | $ 115,000
Carrying Value |  |  | $ 110,873 | $ 110,873
Preferred Stock | Series E 7.00% non-cumulative perpetual |  |  |  |
Class of Stock [Line Items] |  |  |  |
Non cumulative preferred stock, dividend rate |  |  | 7.00% | 7.00%
Preferred stock, authorized (in shares) |  |  | 125,000 | 125,000
Preferred stock, shares outstanding (in shares) |  |  | 125,000 | 125,000
Liquidation Preference |  |  | $ 125,000 | $ 125,000
Carrying Value |  |  | $ 120,255 | $ 120,255

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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + References Reference 1: 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 + Details
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- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + References Reference 1: 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 + Details
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