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STOCKHOLDERS' EQUITY - Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 08, 2016 | Apr. 08, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Apr. 01, 2016
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock, authorized (in shares) |  |  | 50,000,000 |  |  |
Preferred stock, par value (in dollars per share) |  |  | $ 0.01 |  |  |
Preferred stock, liquidation preference per share (in dollars per share) |  |  | $ 1,000 |  |  |
Gross proceeds from issuance of preferred stock |  |  | $ 0 | $ 120,255 | $ 110,873 |
Underwritten Public Offering |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Offering price per share (in dollars per share) | $ 25 | $ 25 |  |  |  |
Depository shares issued | 5,000,000 | 4,600,000 |  |  |  |
Series D 7.375% non-cumulative perpetual |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock, liquidation preference per share (in dollars per share) |  | $ 1,000 |  |  |  |
Depository shares issued |  | 4,000,000 |  |  |  |
Depository shares to preferred stock ratio |  | 2.50% |  |  |  |
Non cumulative preferred stock, dividend rate |  | 7.375% |  |  |  |
Offering price per share (in dollars per share) |  | $ 25.00 |  |  |  |
Gross proceeds from issuance of preferred stock |  | $ 96,900 |  |  |  |
Preferred stock, shares issued |  | 115,000 |  |  |  |
Series D 7.375% non-cumulative perpetual | Over Allotment Option |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Gross proceeds from issuance of preferred stock |  | $ 14,500 |  |  |  |
Underwriters option period |  | 30 days |  |  |  |
Preferred shares available for issuance |  | 600,000 |  |  |  |
Series D 7.375% non-cumulative perpetual | Underwritten Public Offering |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock, liquidation preference per share (in dollars per share) |  | $ 1,000 |  |  |  |
Depository shares to preferred stock ratio |  | 2.50% |  |  |  |
Series E 7.00% non-cumulative perpetual |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock, liquidation preference per share (in dollars per share) | $ 1,000 |  |  |  |  |
Depository shares to preferred stock ratio | 2.50% |  |  |  |  |
Non cumulative preferred stock, dividend rate | 7.00% |  |  |  |  |
Offering price per share (in dollars per share) | $ 25.00 |  |  |  |  |
Preferred stock, shares issued | 125,000 |  |  |  |  |
Series E 7.00% non-cumulative perpetual | Underwritten Public Offering |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock, liquidation preference per share (in dollars per share) | $ 1,000 |  |  |  |  |
Depository shares to preferred stock ratio | 2.50% |  |  |  |  |
Gross proceeds from issuance of preferred stock | $ 121,100 |  |  |  |  |
Depository shares issued | 5,000,000 |  |  |  |  |
Series A Non-cumulative perpetual |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock, liquidation preference per share (in dollars per share) |  |  |  |  |  | $ 1,000
Preferred stock, shares redeemed (in shares) |  |  |  |  |  | 32,000
Series B Non-cumulative perpetual |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock, shares redeemed (in shares) |  |  |  |  |  | 10,000

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- Definition Aggregate number of nonredeemable preferred shares reserved for future issuance. + 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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