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MORTGAGE SERVICING RIGHTS AND MSR FINANCING RECEIVABLES - Schedule of MSRs and MSR Financing Receivables by Type (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Servicing Asset at Amortized Cost [Line Items]      
Weighted Average Life (Years) 3 years 9 months 18 days    
Carrying value $ 9,300,989 $ 8,405,938  
Residential mortgage loans subject to repurchase 2,409,992 $ 1,782,998 $ 1,443,546
Mortgage Servicing Rights and Mortgage Servicing Rights Financing Receivable      
Servicing Asset at Amortized Cost [Line Items]      
UPB of Underlying Residential Mortgage Loans $ 588,865,550    
Weighted Average Life (Years) 6 years 1 month 6 days    
Carrying value $ 9,300,989    
MSRs | Weighted Average      
Servicing Asset at Amortized Cost [Line Items]      
Discount rate 8.80%    
MSRs | Minimum      
Servicing Asset at Amortized Cost [Line Items]      
Discount rate 8.50%    
MSRs | Maximum      
Servicing Asset at Amortized Cost [Line Items]      
Discount rate 10.30%    
Agency | MSRs      
Servicing Asset at Amortized Cost [Line Items]      
UPB of Underlying Residential Mortgage Loans $ 383,218,306    
Weighted Average Life (Years) 6 years 2 months 12 days    
Carrying value $ 5,767,835    
Non-Agency | MSRs      
Servicing Asset at Amortized Cost [Line Items]      
UPB of Underlying Residential Mortgage Loans $ 70,815,704    
Weighted Average Life (Years) 5 years 2 months 12 days    
Carrying value $ 818,978    
Ginnie Mae | MSRs      
Servicing Asset at Amortized Cost [Line Items]      
UPB of Underlying Residential Mortgage Loans $ 134,831,540    
Weighted Average Life (Years) 6 years    
Carrying value $ 2,714,176