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STOCKHOLDERS' EQUITY - Summary of Preferred Stock (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Mar. 31, 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 $ 89,922 $ 1,278 $ 3,237
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 $ 94,956 $ 1,372 $ 1,550