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STOCKHOLDERS' EQUITY - Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 6 Months Ended |
--- | --- | --- | --- | ---
Feb. 08, 2016 | Apr. 08, 2015 | Jun. 30, 2016 | Jun. 30, 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 |  |
Net proceeds from issuance of preferred stock |  |  | $ 120,255 | $ 110,873 |
Underwritten Public Offering |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Price per share of depository shares (in dollars per share) | $ 25 | $ 25 |  |  |
Depository shares issued (in shares) | 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 |  |  |
Issuance of depositary shares |  | 4,000,000 |  |  |
Depository shares to preferred stock ratio |  | 2.50% |  |  |
Non cumulative preferred stock, dividend rate |  | 7.375% |  |  |
Price per share of depository shares (in dollars per share) |  | $ 25 |  |  |
Net proceeds from issuance of preferred stock |  | $ 96,900 |  |  |
Additional depositary shares to cover over-allotments |  | 600,000 |  |  |
Preferred stock, shares issued (in shares) |  | 115,000 |  |  |
Series D 7.375% non-cumulative perpetual | Over Allotment Option |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Net proceeds from issuance of preferred stock |  | $ 14,500 |  |  |
Underwriters option period |  | 30 days |  |  |
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% |  |  |  |
Price per share of depository shares (in dollars per share) | $ 25 |  |  |  |
Preferred stock, shares issued (in shares) | 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% |  |  |  |
Net proceeds from issuance of preferred stock | $ 121,100 |  |  |  |
Depository shares issued (in shares) | 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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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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