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STOCKHOLDERS' EQUITY - Preferred Stock (Details) - Preferred Stock - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Sep. 17, 2018
Mar. 31, 2019
Dec. 31, 2018
Class of Stock [Line Items]      
Preferred stock, authorized (in shares)   240,000,000 240,000,000
Preferred stock, par value (in dollars per share)   $ 0.01  
Preferred stock, liquidation preference per share (in dollars per share)   $ 1,000  
Payment for redemption of shares $ 40.3    
Series C 8.00% non-cumulative perpetual      
Class of Stock [Line Items]      
Preferred stock, authorized (in shares)   0 0
Shares redeemed (in shares) 40,250    
Non cumulative preferred stock, dividend rate 8.00% 8.00% 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) $ 25.00    
Deferred issuance costs reclassified to retained earnings $ 2.3    
Maximum      
Class of Stock [Line Items]      
Preferred stock, authorized (in shares)   50,000,000