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STOCKHOLDERS' EQUITY - Summary of Preferred Stock (Details) - USD ($) $ in Thousands |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 08, 2016 | Jun. 30, 2018 | Dec. 31, 2017
Class of Stock [Line Items] |  |  |
Preferred stock, authorized (in shares) |  | 50,000,000 |
Carrying Value |  | $ 269,071 | $ 269,071
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
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] |  |  |
Preferred stock, authorized (in shares) |  | 40,250 | 40,250
Preferred stock, shares outstanding (in shares) |  | 40,250 | 40,250
Non cumulative preferred stock, dividend rate |  | 8.00% | 8.00%
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] |  |  |
Preferred stock, authorized (in shares) |  | 115,000 | 115,000
Preferred stock, shares outstanding (in shares) |  | 115,000 | 115,000
Non cumulative preferred stock, dividend rate |  | 7.375% | 7.375%
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] |  |  |
Preferred stock, authorized (in shares) |  | 125,000 | 125,000
Preferred stock, shares outstanding (in shares) |  | 125,000 | 125,000
Non cumulative preferred stock, dividend rate |  | 7.00% | 7.00%
Liquidation Preference |  | $ 125,000 | $ 125,000
Carrying Value |  | $ 120,255 | $ 120,255

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