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STOCKHOLDERS' EQUITY - Summary of Preferred Stock (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Dec. 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 $ 1,959
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 $ 178