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STOCKHOLDERS' EQUITY - Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 08, 2016 | Apr. 08, 2015 | Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015 | Apr. 01, 2016
Class of Stock [Line Items] |  |  |  |  |  |
Net proceeds from issuance of preferred stock |  |  | $ 120,258 | $ 0 |  |
Subsequent Event |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock, liquidation preference per share (in dollars per share) |  |  |  |  |  | $ 1,000
Underwritten Public Offering |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Price per share of depository shares (in usd per share) | $ 25 | $ 25 |  |  |  |
Depository shares issued | 5,000,000 | 4,600,000 |  |  |  |
Series D Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Issuance of depositary shares |  | 4,000,000 |  |  |  |
Depository shares to preferred stock ratio |  | 2.50% |  |  |  |
Non cumulative preferred stock, dividend rate |  | 7.375% | 7.375% |  | 7.375% |
Preferred stock, liquidation preference per share (in dollars per share) |  | $ 1,000 | $ 1,000 |  | $ 1,000 |
Price per share of depository shares (in usd 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 | 115,000 |  | 115,000 |
Series D Preferred Stock | Over Allotment Option |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Net proceeds from issuance of preferred stock |  | $ 14,500 |  |  |  |
Underwriters option period |  | 30 days |  |  |  |
Series D Preferred Stock | Underwritten Public Offering |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Depository shares to preferred stock ratio |  | 2.50% |  |  |  |
Preferred stock, liquidation preference per share (in dollars per share) |  | $ 1,000 |  |  |  |
Series E Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Depository shares to preferred stock ratio | 2.50% |  |  |  |  |
Non cumulative preferred stock, dividend rate | 7.00% |  | 7.00% |  | 7.00% |
Preferred stock, liquidation preference per share (in dollars per share) | $ 1,000 |  | $ 1,000 |  | $ 1,000 |
Price per share of depository shares (in usd per share) | $ 25 |  |  |  |  |
Preferred stock, shares issued (in shares) | 125,000 |  | 125,000 |  | 0 |
Series E Preferred Stock | Underwritten Public Offering |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Depository shares to preferred stock ratio | 2.50% |  |  |  |  |
Preferred stock, liquidation preference per share (in dollars per share) | $ 1,000 |  |  |  |  |
Net proceeds from issuance of preferred stock | $ 121,100 |  |  |  |  |
Depository shares issued | 5,000,000 |  |  |  |  |
Series A Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock, liquidation preference per share (in dollars per share) |  |  | $ 1,000 |  | $ 1,000 |
Preferred stock, shares issued (in shares) |  |  | 32,000 |  | 32,000 |
Series A Preferred Stock | Subsequent Event |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock, shares redeemed (in shares) |  |  |  |  |  | 32,000
Series B Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock, liquidation preference per share (in dollars per share) |  |  | $ 1,000 |  | $ 1,000 |
Preferred stock, shares issued (in shares) |  |  | 10,000 |  | 10,000 |
Series B Preferred Stock | Subsequent Event |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock, shares redeemed (in shares) |  |  |  |  |  | 10,000

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