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STOCKHOLDERS' EQUITY - Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended
Feb. 08, 2016
Sep. 30, 2017
Sep. 30, 2016
Apr. 01, 2016
Apr. 08, 2015
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      
Net proceeds from issuance of preferred stock   $ 0 $ 120,255    
Underwritten Public Offering          
Class of Stock [Line Items]          
Depository shares issued (in shares) 5,000,000       4,600,000
Price per share of depository shares (in dollars per share) $ 25       $ 25
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%        
Preferred stock, shares issued (in shares) 125,000        
Price per share of depository shares (in dollars per share) $ 25        
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 issued (in shares) 5,000,000        
Depository shares to preferred stock ratio 2.50%        
Net proceeds from issuance of preferred stock $ 121,100        
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