Quarterly report pursuant to Section 13 or 15(d)

EXCESS MORTGAGE SERVICING RIGHTS ASSETS - Summary of Direct Investments in Excess MSRs (Details)

v3.21.2
EXCESS MORTGAGE SERVICING RIGHTS ASSETS - Summary of Direct Investments in Excess MSRs (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]          
Weighted Average Life (Years)     1 year 1 month 6 days    
Servicer advance investments | Servicer Advances          
Schedule of Equity Method Investments [Line Items]          
Residential mortgage loan UPB $ 21,568,182   $ 21,568,182   $ 26,061,499
Original and Recaptured Pools          
Schedule of Equity Method Investments [Line Items]          
Original and Recaptured Pools (4,837) $ (664) (13,666) $ (11,773)  
Excess MSRs          
Schedule of Equity Method Investments [Line Items]          
Residential mortgage loan UPB 60,598,856   $ 60,598,856    
Weighted Average Life (Years)     6 years 3 months 18 days    
Amortized Cost Basis 223,809   $ 223,809    
Carrying Value 270,180   270,180   310,938
Excess MSRs | Agency | Original and Recaptured Pools          
Schedule of Equity Method Investments [Line Items]          
Residential mortgage loan UPB 28,418,993   $ 28,418,993    
Weighted Average Life (Years)     6 years    
Amortized Cost Basis 125,402   $ 125,402    
Carrying Value $ 139,289   $ 139,289   162,645
Excess MSRs | Agency | Original and Recaptured Pools | Minimum          
Schedule of Equity Method Investments [Line Items]          
Interest in Excess MSR 32.50%   32.50%    
Excess MSRs | Agency | Original and Recaptured Pools | Maximum          
Schedule of Equity Method Investments [Line Items]          
Interest in Excess MSR 66.70%   66.70%    
Excess MSRs | Agency | Original and Recaptured Pools | Weighted Average          
Schedule of Equity Method Investments [Line Items]          
Interest in Excess MSR 53.30%   53.30%    
Excess MSRs | Agency | Fortress-managed funds | Original and Recaptured Pools | Minimum          
Schedule of Equity Method Investments [Line Items]          
Interest in Excess MSR 0.00%   0.00%    
Excess MSRs | Agency | Fortress-managed funds | Original and Recaptured Pools | Maximum          
Schedule of Equity Method Investments [Line Items]          
Interest in Excess MSR 40.00%   40.00%    
Excess MSRs | Agency | Mr. Cooper | Original and Recaptured Pools | Minimum          
Schedule of Equity Method Investments [Line Items]          
Interest in Excess MSR 20.00%   20.00%    
Excess MSRs | Agency | Mr. Cooper | Original and Recaptured Pools | Maximum          
Schedule of Equity Method Investments [Line Items]          
Interest in Excess MSR 35.00%   35.00%    
Excess MSRs | Non-Agency | Original and Recaptured Pools          
Schedule of Equity Method Investments [Line Items]          
Residential mortgage loan UPB $ 32,179,863   $ 32,179,863    
Weighted Average Life (Years)     6 years 7 months 6 days    
Amortized Cost Basis 98,407   $ 98,407    
Carrying Value $ 130,891   $ 130,891   $ 148,293
Excess MSRs | Non-Agency | Original and Recaptured Pools | Minimum          
Schedule of Equity Method Investments [Line Items]          
Interest in Excess MSR 33.30%   33.30%    
Excess MSRs | Non-Agency | Original and Recaptured Pools | Maximum          
Schedule of Equity Method Investments [Line Items]          
Interest in Excess MSR 100.00%   100.00%    
Excess MSRs | Non-Agency | Original and Recaptured Pools | Weighted Average          
Schedule of Equity Method Investments [Line Items]          
Interest in Excess MSR 59.40%   59.40%    
Excess MSRs | Non-Agency | Fortress-managed funds | Original and Recaptured Pools | Minimum          
Schedule of Equity Method Investments [Line Items]          
Interest in Excess MSR 0.00%   0.00%    
Excess MSRs | Non-Agency | Fortress-managed funds | Original and Recaptured Pools | Maximum          
Schedule of Equity Method Investments [Line Items]          
Interest in Excess MSR 50.00%   50.00%    
Excess MSRs | Non-Agency | Mr. Cooper | Original and Recaptured Pools | Minimum          
Schedule of Equity Method Investments [Line Items]          
Interest in Excess MSR 0.00%   0.00%    
Excess MSRs | Non-Agency | Mr. Cooper | Original and Recaptured Pools | Maximum          
Schedule of Equity Method Investments [Line Items]          
Interest in Excess MSR 33.30%   33.30%