Annual report [Section 13 and 15(d), not S-K Item 405]

Fair Value - Weighted Average Unobservable Assumptions Used In The Fair Value Measurements (Details)

v3.25.0.1
Fair Value - Weighted Average Unobservable Assumptions Used In The Fair Value Measurements (Details)
Dec. 31, 2024
Dec. 31, 2023
Weighted Average | WAL (in years)    
Unobservable Assumptions    
Retained bonds, measurement input 3.5 4.9
Weighted Average | Discount rate    
Unobservable Assumptions    
Retained bonds, measurement input 0.073 0.067
Weighted Average | Discount rate | TRA obligation    
Unobservable Assumptions    
Deferred purchase price liabilities, measurement input 0.281 0.330
Weighted Average | Loans held for investment, subject to HMBS related obligations | WAL (in years)    
Unobservable Assumptions    
Loans held-for-investment, measurement input 3.0 3.4
Weighted Average | Loans held for investment, subject to HMBS related obligations | CPR    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.216 0.201
Weighted Average | Loans held for investment, subject to HMBS related obligations | Loss frequency    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.044 0.045
Weighted Average | Loans held for investment, subject to HMBS related obligations | Loss severity    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.035 0.035
Weighted Average | Loans held for investment, subject to HMBS related obligations | Discount rate    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.053 0.050
Weighted Average | Loans held for investment, subject to HMBS related obligations | Average draw rate    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.011 0.011
Weighted Average | Non-agency reverse mortgage loans - securitized | WAL (in years)    
Unobservable Assumptions    
Loans held-for-investment, measurement input 10.1 9.7
Weighted Average | Non-agency reverse mortgage loans - securitized | CPR    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.148 0.147
Weighted Average | Non-agency reverse mortgage loans - securitized | Loss severity    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.100 0.100
Weighted Average | Non-agency reverse mortgage loans - securitized | Discount rate    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.070 0.069
Weighted Average | Non-agency reverse mortgage loans - securitized | LTV    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.472 0.459
Weighted Average | Non-agency reverse mortgage loans - securitized | HPA    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.036 0.033
Weighted Average | HECM buyouts - securitized (performing) | WAL (in years)    
Unobservable Assumptions    
Loans held-for-investment, measurement input 7.1 7.4
Weighted Average | HECM buyouts - securitized (performing) | CPR    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.151 0.151
Weighted Average | HECM buyouts - securitized (performing) | Loss severity    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.047 0.069
Weighted Average | HECM buyouts - securitized (performing) | Discount rate    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.080 0.082
Weighted Average | HECM buyouts - securitized (nonperforming) | WAL (in years)    
Unobservable Assumptions    
Loans held-for-investment, measurement input 1.5 1.6
Weighted Average | HECM buyouts - securitized (nonperforming) | CPR    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.400 0.398
Weighted Average | HECM buyouts - securitized (nonperforming) | Loss frequency    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.456 0.510
Weighted Average | HECM buyouts - securitized (nonperforming) | Loss severity    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.052 0.064
Weighted Average | HECM buyouts - securitized (nonperforming) | Discount rate    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.080 0.086
Weighted Average | Commercial mortgage loans - securitized | Discount rate    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.207 0.165
Weighted Average | Commercial mortgage loans - securitized | SMM    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.082 0.107
Weighted Average | Commercial mortgage loans - securitized | Loss rate    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.075 0.010
Weighted Average | Non-agency reverse mortgage loans | WAL (in years)    
Unobservable Assumptions    
Loans held-for-investment, measurement input 10.5 12.1
Weighted Average | Non-agency reverse mortgage loans | CPR    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.162 0.144
Weighted Average | Non-agency reverse mortgage loans | Loss severity    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.100 0.100
Weighted Average | Non-agency reverse mortgage loans | Discount rate    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.071 0.069
Weighted Average | Non-agency reverse mortgage loans | LTV    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.351 0.338
Weighted Average | Non-agency reverse mortgage loans | HPA    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.035 0.031
Weighted Average | HECM buyouts (nonperforming) | WAL (in years)    
Unobservable Assumptions    
Loans held-for-investment, measurement input 1.5 1.5
Weighted Average | HECM buyouts (nonperforming) | CPR    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.438 0.415
Weighted Average | HECM buyouts (nonperforming) | Loss frequency    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.479 0.482
Weighted Average | HECM buyouts (nonperforming) | Loss severity    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.105 0.051
Weighted Average | HECM buyouts (nonperforming) | Discount rate    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.080 0.086
Weighted Average | Commercial mortgage loans | Discount rate    
Unobservable Assumptions    
Loans held-for-investment, measurement input   0.132
Weighted Average | Commercial mortgage loans | SMM    
Unobservable Assumptions    
Loans held-for-investment, measurement input   0.736
Weighted Average | Commercial mortgage loans | CDR    
Unobservable Assumptions    
Loans held-for-investment, measurement input   0.256
Weighted Average | HMBS related obligations | WAL (in years)    
Unobservable Assumptions    
Loans held-for-investment, measurement input 3.8 4.1
Weighted Average | HMBS related obligations | CPR    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.248 0.238
Weighted Average | HMBS related obligations | Discount rate    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.052 0.050
Weighted Average | Securitized non-agency reverse | WAL (in years)    
Unobservable Assumptions    
Long-term debt, measurement input 3.7 4.5
Weighted Average | Securitized non-agency reverse | CPR    
Unobservable Assumptions    
Long-term debt, measurement input 0.173 0.147
Weighted Average | Securitized non-agency reverse | Discount rate    
Unobservable Assumptions    
Long-term debt, measurement input 0.067 0.070
Weighted Average | Performing/Nonperforming HECM securitizations | WAL (in years)    
Unobservable Assumptions    
Long-term debt, measurement input 1.0 0.9
Weighted Average | Performing/Nonperforming HECM securitizations | CPR    
Unobservable Assumptions    
Long-term debt, measurement input 0.186 0.219
Weighted Average | Performing/Nonperforming HECM securitizations | Discount rate    
Unobservable Assumptions    
Long-term debt, measurement input 0.075 0.100
Weighted Average | Nonrecourse commercial loan financing liability | Discount rate    
Unobservable Assumptions    
Long-term debt, measurement input 0.086 0.091
Weighted Average | Nonrecourse commercial loan financing liability | Weighted average SMM    
Unobservable Assumptions    
Long-term debt, measurement input 0.654 0.333
Minimum | WAL (in years)    
Unobservable Assumptions    
Retained bonds, measurement input   2.3
Minimum | Discount rate    
Unobservable Assumptions    
Retained bonds, measurement input (0.013) (0.312)
Minimum | Loans held for investment, subject to HMBS related obligations | Loss severity    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.034 0.034
Minimum | Non-agency reverse mortgage loans - securitized | LTV    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.000 0.000
Minimum | Non-agency reverse mortgage loans - securitized | HPA    
Unobservable Assumptions    
Loans held-for-investment, measurement input (0.056) (0.098)
Minimum | HECM buyouts - securitized (performing) | Loss severity    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.034 0.034
Minimum | HECM buyouts - securitized (nonperforming) | Loss frequency    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.231 0.231
Minimum | HECM buyouts - securitized (nonperforming) | Loss severity    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.034 0.034
Minimum | Non-agency reverse mortgage loans | LTV    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.059 0.039
Minimum | Non-agency reverse mortgage loans | HPA    
Unobservable Assumptions    
Loans held-for-investment, measurement input (0.056) (0.098)
Minimum | HECM buyouts (nonperforming) | Loss severity    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.034 0.034
Minimum | Commercial mortgage loans | Discount rate    
Unobservable Assumptions    
Loans held-for-investment, measurement input   0.096
Minimum | Securitized non-agency reverse | WAL (in years)    
Unobservable Assumptions    
Long-term debt, measurement input 0.1 0.8
Minimum | Securitized non-agency reverse | CPR    
Unobservable Assumptions    
Long-term debt, measurement input   0.106
Minimum | Performing/Nonperforming HECM securitizations | CPR    
Unobservable Assumptions    
Long-term debt, measurement input   0.215
Maximum | WAL (in years)    
Unobservable Assumptions    
Retained bonds, measurement input   23.4
Maximum | Discount rate    
Unobservable Assumptions    
Retained bonds, measurement input 0.153 0.123
Maximum | Loans held for investment, subject to HMBS related obligations | Loss severity    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.159 0.129
Maximum | Non-agency reverse mortgage loans - securitized | LTV    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.980 0.796
Maximum | Non-agency reverse mortgage loans - securitized | HPA    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.083 0.076
Maximum | HECM buyouts - securitized (performing) | Loss severity    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.159 0.128
Maximum | HECM buyouts - securitized (nonperforming) | Loss frequency    
Unobservable Assumptions    
Loans held-for-investment, measurement input 1.000 1.000
Maximum | HECM buyouts - securitized (nonperforming) | Loss severity    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.159 0.128
Maximum | Non-agency reverse mortgage loans | LTV    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.706 0.538
Maximum | Non-agency reverse mortgage loans | HPA    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.083 0.076
Maximum | HECM buyouts (nonperforming) | Loss severity    
Unobservable Assumptions    
Loans held-for-investment, measurement input 0.159 0.128
Maximum | Commercial mortgage loans | Discount rate    
Unobservable Assumptions    
Loans held-for-investment, measurement input   0.200
Maximum | Securitized non-agency reverse | WAL (in years)    
Unobservable Assumptions    
Long-term debt, measurement input 10.9 11.2
Maximum | Securitized non-agency reverse | CPR    
Unobservable Assumptions    
Long-term debt, measurement input   0.223
Maximum | Performing/Nonperforming HECM securitizations | CPR    
Unobservable Assumptions    
Long-term debt, measurement input   0.223