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STOCKHOLDERS' EQUITY - Summary of Preferred Stock (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Class of Stock [Line Items]          
Carrying Value $ 94,956   $ 184,878    
Preferred Stock          
Class of Stock [Line Items]          
Preferred stock, outstanding (in shares) 98,702   191,972    
Liquidation Preference $ 98,702   $ 191,972    
Carrying Value $ 94,956   $ 184,878    
Preferred Stock | Series D 
7.375% non-cumulative perpetual          
Class of Stock [Line Items]          
Non cumulative preferred stock, dividend rate (percent) 7.375%        
Preferred stock, outstanding (in shares) 0   93,270    
Liquidation Preference $ 0   $ 93,270    
Carrying Value $ 0 $ 0 $ 89,922 $ 2 $ 3,240
Preferred Stock | Series E 
7.00% non-cumulative perpetual          
Class of Stock [Line Items]          
Non cumulative preferred stock, dividend rate (percent) 7.00%        
Preferred stock, outstanding (in shares) 98,702   98,702    
Liquidation Preference $ 98,702   $ 98,702    
Carrying Value $ 94,956 $ 0 $ 94,956 $ 156 $ 1,707