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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