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STOCKHOLDERS' EQUITY - Preferred Stock (Details) - Preferred Stock - USD ($)
$ / shares in Units, $ in Millions
 9 Months Ended 12 Months Ended
Aug. 23, 2019
Sep. 17, 2018
Sep. 30, 2019
Dec. 31, 2018
Class of Stock [Line Items]        
Payment for redemption of shares   $ 40.3    
Series C 8.00% non-cumulative perpetual        
Class of Stock [Line Items]        
Shares redeemed (in shares)   40,250    
Non cumulative preferred stock, dividend rate   8.00%    
Liquidation amount (in usd per share)   $ 1,000    
Series C Depository Shares        
Class of Stock [Line Items]        
Shares redeemed (in shares)   1,610,000    
Liquidation amount (in usd per share)   $ 25    
Interest in Series C Preferred Stock represented by each redeemed share (percent)   2.50%    
Deferred issuance costs reclassified to retained earnings   $ 2.3    
Series D Depository Shares        
Class of Stock [Line Items]        
Shares redeemed (in shares) 734,823      
Liquidation amount (in usd per share) $ 1,000      
Interest in Series C Preferred Stock represented by each redeemed share (percent) 2.50%      
Payment for redemption of shares $ 19.4      
Series D Preferred Stock        
Class of Stock [Line Items]        
Shares redeemed (in shares) 18,371      
Non cumulative preferred stock, dividend rate     7.375% 7.375%
Deferred issuance costs reclassified to retained earnings $ 1.7      
Series E Depository Shares        
Class of Stock [Line Items]        
Shares redeemed (in shares) 980,928      
Liquidation amount (in usd per share) $ 1,000      
Interest in Series C Preferred Stock represented by each redeemed share (percent) 2.50%      
Payment for redemption of shares $ 26.6      
Series E Preferred Stock        
Class of Stock [Line Items]        
Shares redeemed (in shares) 24,523      
Non cumulative preferred stock, dividend rate     7.00% 7.00%
Deferred issuance costs reclassified to retained earnings $ 3.4