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STOCKHOLDERS' EQUITY - Summary of Preferred Stock (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Feb. 08, 2016
Sep. 30, 2018
Dec. 31, 2017
Class of Stock [Line Items]      
Carrying Value   $ 231,128 $ 269,071
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)   240,000,000 280,250,000
Preferred stock, outstanding (in shares)   240,000,000 280,250,000
Liquidation Preference   $ 240,000 $ 280,250
Carrying Value   $ 231,128 $ 269,071
Preferred Stock | Series C 8.00% non-cumulative perpetual      
Class of Stock [Line Items]      
Preferred stock, authorized (in shares)   0 40,250,000
Preferred stock, outstanding (in shares)   0 40,250,000
Non cumulative preferred stock, dividend rate   8.00% 8.00%
Liquidation Preference   $ 0 $ 40,250
Carrying Value   $ 0 $ 37,943
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
Non cumulative preferred stock, dividend rate   7.375% 7.375%
Liquidation Preference   $ 115,000 $ 115,000
Carrying Value   $ 110,873 $ 110,873
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
Non cumulative preferred stock, dividend rate   7.00% 7.00%
Liquidation Preference   $ 125,000 $ 125,000
Carrying Value   $ 120,255 $ 120,255