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WAREHOUSE AND OTHER LINES OF CREDIT - Additional Information (Details)
1 Months Ended 9 Months Ended
Apr. 30, 2021
USD ($)
Feb. 28, 2021
USD ($)
Dec. 31, 2020
USD ($)
Oct. 31, 2020
USD ($)
Oct. 31, 2019
USD ($)
May 31, 2019
USD ($)
Sep. 30, 2021
USD ($)
lineOfCredit
Line of Credit Facility [Line Items]              
Number of lines of credit held | lineOfCredit             15
Restricted cash     $ 204,465,000       $ 97,805,000
Warehouse Agreement Borrowings              
Line of Credit Facility [Line Items]              
Restricted cash     6,700,000       $ 7,000,000
Warehouse Agreement Borrowings | Minimum              
Line of Credit Facility [Line Items]              
Debt instrument, term             1 year
Warehouse Agreement Borrowings | Maximum              
Line of Credit Facility [Line Items]              
Debt instrument, term             2 years
Warehouse and Revolving Credit Facilities              
Line of Credit Facility [Line Items]              
Maximum borrowing capacity             $ 11,050,000,000
Weighted average interest rate             2.06%
Securitization Facilities | 2019-1 Securitization Facility              
Line of Credit Facility [Line Items]              
Maximum borrowing capacity           $ 300,000,000  
Debt instrument, term           2 years  
Securitization Facilities | 2019-2 Securitization Facility              
Line of Credit Facility [Line Items]              
Maximum borrowing capacity         $ 300,000,000    
Debt instrument, term         2 years    
Securitization Facilities | 2020-1 Securitization Facility              
Line of Credit Facility [Line Items]              
Maximum borrowing capacity       $ 600,000,000      
Debt instrument, term       2 years      
Securitization Facilities | 2020-2 Securitization Facility              
Line of Credit Facility [Line Items]              
Maximum borrowing capacity     $ 500,000,000        
Debt instrument, term     3 years        
Securitization Facilities | 2021-1 Securitization Facility              
Line of Credit Facility [Line Items]              
Maximum borrowing capacity   $ 500,000,000          
Debt instrument, term   3 years          
Securitization Facilities | 2021-2 Securitization Facility              
Line of Credit Facility [Line Items]              
Maximum borrowing capacity $ 500,000,000            
Debt instrument, term 3 years            
Securitization Facilities | Minimum              
Line of Credit Facility [Line Items]              
Debt instrument, term             2 years
Securitization Facilities | Maximum              
Line of Credit Facility [Line Items]              
Debt instrument, term             3 years