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DEBT - Junior Subordinated Notes and SBA 7(a) Loan-Backed Notes Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
May 30, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]        
Proceeds from SBA 7(a) loan-backed notes     $ 0 $ 0
Restricted cash   $ 10,013 12,146 $ 22,512
Junior subordinated notes | LIBOR        
Debt Instrument [Line Items]        
Interest rate margin   3.25%    
SBA 7(a) loan-backed notes        
Debt Instrument [Line Items]        
Proceeds from SBA 7(a) loan-backed notes $ 38,200      
Weighted average life of notes 2 years      
Restricted cash   $ 1,200 $ 3,300  
SBA 7(a) loan-backed notes | LIBOR        
Debt Instrument [Line Items]        
Interest rate margin 1.40%      
SBA 7(a) loan-backed notes | Prime Rate        
Debt Instrument [Line Items]        
Interest rate margin (1.08%)