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STOCKHOLDERS' EQUITY - Summary of Preferred Stock (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 17, 2018
Feb. 08, 2016
Mar. 31, 2019
Dec. 31, 2018
Class of Stock [Line Items]        
Carrying Value     $ 231,128 $ 231,128
Series E 7.00% non-cumulative perpetual        
Class of Stock [Line Items]        
Non cumulative preferred stock, dividend rate   7.00%    
Preferred Stock        
Class of Stock [Line Items]        
Preferred stock, authorized (in shares)     240,000,000 240,000,000
Preferred stock, outstanding (in shares)     240,000,000 240,000,000
Liquidation Preference     $ 240,000 $ 240,000
Carrying Value     $ 231,128 $ 231,128
Preferred Stock | Series C 8.00% non-cumulative perpetual        
Class of Stock [Line Items]        
Preferred stock, authorized (in shares)     0 0
Preferred stock, outstanding (in shares)     0 0
Liquidation Preference     $ 0 $ 0
Carrying Value     $ 0 $ 0
Non cumulative preferred stock, dividend rate 8.00%   8.00% 8.00%
Preferred Stock | Series D 7.375% non-cumulative perpetual        
Class of Stock [Line Items]        
Preferred stock, authorized (in shares)     115,000,000 115,000,000
Preferred stock, outstanding (in shares)     115,000,000 115,000,000
Liquidation Preference     $ 115,000 $ 115,000
Carrying Value     $ 110,873 $ 110,873
Non cumulative preferred stock, dividend rate     7.375% 7.375%
Preferred Stock | Series E 7.00% non-cumulative perpetual        
Class of Stock [Line Items]        
Preferred stock, authorized (in shares)     125,000,000 125,000,000
Preferred stock, outstanding (in shares)     125,000,000 125,000,000
Liquidation Preference     $ 125,000 $ 125,000
Carrying Value     $ 120,255 $ 120,255
Non cumulative preferred stock, dividend rate     7.00% 7.00%