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WAREHOUSE AND OTHER LINES OF CREDIT - Warehouse Borrowings (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Line of Credit Facility [Line Items]    
Outstanding Balance $ 8,212,142,000 $ 6,577,429,000
Debt obligations, net 1,408,751,000 712,466,000
Finance Servicing Rights    
Line of Credit Facility [Line Items]    
Debt obligations, net 15,000,000  
Warehouse and Revolving Credit Facilities    
Line of Credit Facility [Line Items]    
Committed Amount 4,350,000,000  
Uncommitted Amount 6,700,000,000  
Total Facility Amount 11,050,000,000  
Outstanding Balance 8,212,142,000 6,577,429,000
Warehouse and Revolving Credit Facilities | Facility 1    
Line of Credit Facility [Line Items]    
Committed Amount 1,000,000,000  
Uncommitted Amount 500,000,000  
Total Facility Amount 1,500,000,000  
Outstanding Balance 1,327,881,000 1,665,005,000
Warehouse and Revolving Credit Facilities | Facility 2    
Line of Credit Facility [Line Items]    
Committed Amount 0  
Uncommitted Amount 600,000,000  
Total Facility Amount 600,000,000  
Outstanding Balance 378,870,000 226,891,000
Warehouse and Revolving Credit Facilities | Facility 3    
Line of Credit Facility [Line Items]    
Committed Amount 0  
Uncommitted Amount 500,000,000  
Total Facility Amount 500,000,000  
Outstanding Balance 341,899,000 206,863,000
Warehouse and Revolving Credit Facilities | Facility 4    
Line of Credit Facility [Line Items]    
Committed Amount 100,000,000  
Uncommitted Amount 300,000,000  
Total Facility Amount 400,000,000  
Outstanding Balance 262,104,000 335,096,000
Warehouse and Revolving Credit Facilities | Facility 5    
Line of Credit Facility [Line Items]    
Committed Amount 0  
Uncommitted Amount 200,000,000  
Total Facility Amount 200,000,000  
Outstanding Balance 244,000 0
Warehouse and Revolving Credit Facilities | Facility 6    
Line of Credit Facility [Line Items]    
Committed Amount 100,000,000  
Uncommitted Amount 1,000,000,000  
Total Facility Amount 1,100,000,000  
Outstanding Balance 989,433,000 626,741,000
Warehouse and Revolving Credit Facilities | Facility 7    
Line of Credit Facility [Line Items]    
Committed Amount 750,000,000  
Uncommitted Amount 1,250,000,000  
Total Facility Amount 2,000,000,000  
Outstanding Balance 1,555,688,000 919,068,000
Warehouse and Revolving Credit Facilities | Facility 8    
Line of Credit Facility [Line Items]    
Committed Amount 0  
Uncommitted Amount 0  
Total Facility Amount 0  
Outstanding Balance 0 300,000,000
Warehouse and Revolving Credit Facilities | Facility 9    
Line of Credit Facility [Line Items]    
Committed Amount 300,000,000  
Uncommitted Amount 0  
Total Facility Amount 300,000,000  
Outstanding Balance 300,000,000 299,803,000
Warehouse and Revolving Credit Facilities | Facility 10    
Line of Credit Facility [Line Items]    
Committed Amount 0  
Uncommitted Amount 850,000,000  
Total Facility Amount 850,000,000  
Outstanding Balance 365,145,000 358,761,000
Warehouse and Revolving Credit Facilities | Facility 11    
Line of Credit Facility [Line Items]    
Committed Amount 600,000,000  
Uncommitted Amount 0  
Total Facility Amount 600,000,000  
Outstanding Balance 600,000,000 600,000,000
Warehouse and Revolving Credit Facilities | Facility 12    
Line of Credit Facility [Line Items]    
Committed Amount 500,000,000  
Uncommitted Amount 0  
Total Facility Amount 500,000,000  
Outstanding Balance 499,544,000 500,000,000
Warehouse and Revolving Credit Facilities | Facility 13    
Line of Credit Facility [Line Items]    
Committed Amount 0  
Uncommitted Amount 1,000,000,000  
Total Facility Amount 1,000,000,000  
Outstanding Balance 386,920,000 259,247,000
Warehouse and Revolving Credit Facilities | Facility 14    
Line of Credit Facility [Line Items]    
Committed Amount 0  
Uncommitted Amount 0  
Total Facility Amount 0  
Outstanding Balance 0 279,954,000
Warehouse and Revolving Credit Facilities | Facility 15    
Line of Credit Facility [Line Items]    
Committed Amount 500,000,000  
Uncommitted Amount 0  
Total Facility Amount 500,000,000  
Outstanding Balance 500,000,000 0
Warehouse and Revolving Credit Facilities | Facility 16    
Line of Credit Facility [Line Items]    
Committed Amount 500,000,000  
Uncommitted Amount 0  
Total Facility Amount 500,000,000  
Outstanding Balance 500,000,000 0
Warehouse and Revolving Credit Facilities | Facility 17    
Line of Credit Facility [Line Items]    
Committed Amount 0  
Uncommitted Amount 500,000,000  
Total Facility Amount 500,000,000  
Outstanding Balance $ 204,414,000 $ 0