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STOCKHOLDERS' EQUITY - Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Feb. 08, 2016
Apr. 08, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 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      
Gross proceeds from issuance of preferred stock     $ 0 $ 120,255 $ 110,873  
Underwritten Public Offering            
Class of Stock [Line Items]            
Offering price per share (in dollars per share) $ 25 $ 25        
Depository shares issued 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        
Depository shares issued   4,000,000        
Depository shares to preferred stock ratio   2.50%        
Non cumulative preferred stock, dividend rate   7.375%        
Offering price per share (in dollars per share)   $ 25.00        
Gross proceeds from issuance of preferred stock   $ 96,900        
Preferred stock, shares issued   115,000        
Series D 7.375% non-cumulative perpetual | 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 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%          
Offering price per share (in dollars per share) $ 25.00          
Preferred stock, shares issued 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%          
Gross proceeds from issuance of preferred stock $ 121,100          
Depository shares issued 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