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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