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STOCKHOLDERS' EQUITY - Perpetual Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 08, 2016 | Apr. 08, 2015 | Jun. 12, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Jul. 01, 2013
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) |  |  |  | $ 0.01 | $ 0.01 |  |
Gross proceeds from issuance of preferred stock |  |  |  | $ 110,873 | $ 0 | $ 37,943 |
Private Bank of California |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, liquidation preference per share (in dollars per share) |  |  |  |  |  |  | $ 1,000
Preferred stock, shares outstanding |  |  |  |  |  |  | 10,000
Underwritten Public Offering |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Offering price per share |  | $ 25 |  |  |  |  |
Depository shares issued |  | 4,600,000 |  |  |  |  |
Underwritten Public Offering | Subsequent Event |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Offering price per share | $ 25 |  |  |  |  |  |
Depository shares issued | 5,000,000 |  |  |  |  |  |
Series C Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Depository shares issued |  |  | 1,400,000 |  |  |  |
Depository shares to preferred stock ratio |  |  | 2.50% |  |  |  |
Non cumulative preferred stock, dividend rate |  |  | 8.00% | 8.00% | 8.00% |  |
Preferred stock, par value (in dollars per share) |  |  | $ 0.01 |  |  |  |
Preferred stock, liquidation preference per share (in dollars per share) |  |  | 1,000 | $ 1,000 | $ 1,000 |  |
Offering price per share |  |  | $ 25.00 |  |  |  |
Gross proceeds from issuance of preferred stock |  |  | $ 33,900 |  |  |  |
Preferred stock, shares outstanding |  |  |  | 40,250 | 40,250 |  |
Preferred stock, shares issued |  |  |  | 40,250 | 40,250 |  |
Series C Preferred Stock | Over Allotment Option |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Gross proceeds from issuance of preferred stock |  |  | $ 5,100 |  |  |  |
Underwriters option period |  |  | 30 days |  |  |  |
Preferred shares available for issuance |  |  | 210,000 |  |  |  |
Series B Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, liquidation preference per share (in dollars per share) |  |  |  | $ 1,000 | $ 1,000 |  | $ 1,000
Preferred stock, shares outstanding |  |  |  | 10,000 | 10,000 |  |
Preferred stock, shares issued |  |  |  | 10,000 | 10,000 |  |
Series A Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, liquidation preference per share (in dollars per share) |  |  |  | $ 1,000 | $ 1,000 |  | $ 1,000
Preferred stock, shares outstanding |  |  |  | 32,000 | 32,000 |  |
Preferred stock, shares issued |  |  |  | 32,000 | 32,000 |  | 32,000
Series D Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Depository shares issued |  | 4,000,000 |  |  |  |  |
Depository shares to preferred stock ratio |  | 2.50% |  |  |  |  |
Non cumulative preferred stock, dividend rate |  | 7.375% |  | 7.375% |  |  |
Preferred stock, liquidation preference per share (in dollars per share) |  | $ 1,000 |  | $ 1,000 |  |  |
Offering price per share |  | $ 25.00 |  |  |  |  |
Gross proceeds from issuance of preferred stock |  | $ 96,900 |  |  |  |  |
Preferred stock, shares outstanding |  |  |  | 115,000 |  |  |
Preferred stock, shares issued |  |  |  | 115,000 |  |  |
Series D Preferred Stock | 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 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 | Subsequent Event |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Depository shares to preferred stock ratio | 2.50% |  |  |  |  |  |
Non cumulative preferred stock, dividend rate | 7.00% |  |  |  |  |  |
Preferred stock, liquidation preference per share (in dollars per share) | $ 1,000 |  |  |  |  |  |
Offering price per share | $ 25.00 |  |  |  |  |  |
Series E Preferred Stock | Over Allotment Option | Subsequent Event |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Depository shares issued | 750,000 |  |  |  |  |  |
Underwriters option period | 30 days |  |  |  |  |  |
Series E Preferred Stock | Underwritten Public Offering | Subsequent Event |  |  |  |  |  |  |
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 |  |  |  |  |  |

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