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STOCKHOLDERS' EQUITY - Summary of Preferred Stock (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Class of Stock [Line Items]    
Carrying Value $ 189,825 $ 231,128
Preferred Stock    
Class of Stock [Line Items]    
Preferred stock, authorized (in shares) 197,106 240,000
Preferred stock, shares outstanding (in shares) 197,106 240,000
Liquidation Preference $ 197,106 $ 240,000
Carrying Value $ 189,825 $ 231,128
Preferred Stock | Series D 7.375% non-cumulative perpetual    
Class of Stock [Line Items]    
Non cumulative preferred stock, dividend rate (percent) 7.375% 7.375%
Preferred stock, authorized (in shares) 96,629  
Preferred stock, shares outstanding (in shares) 96,629 115,000
Liquidation Preference $ 96,629 $ 115,000
Carrying Value $ 93,162 $ 110,873
Preferred Stock | Series E 7.00% non-cumulative perpetual    
Class of Stock [Line Items]    
Non cumulative preferred stock, dividend rate (percent) 7.00% 7.00%
Preferred stock, authorized (in shares) 100,477  
Preferred stock, shares outstanding (in shares) 100,477 125,000
Liquidation Preference $ 100,477 $ 125,000
Carrying Value $ 96,663 $ 120,255