Fair Value - Weighted Average Unobservable Assumptions Used in the Fair Value Measurements (Details)	Dec. 31, 2025 yr	Dec. 31, 2024 yr
Minimum | Discount rate
Unobservable Assumptions
Retained bonds, measurement input	(0.017)	(0.013)
Minimum | Loans held for investment, subject to HMBS related obligations | Loss severity
Unobservable Assumptions
Loans held-for-investment, measurement input	0.058	0.034
Minimum | Non-agency reverse mortgage loans - securitized | LTV
Unobservable Assumptions
Loans held-for-investment, measurement input		0.000
Minimum | Non-agency reverse mortgage loans - securitized | HPA
Unobservable Assumptions
Loans held-for-investment, measurement input	(0.068)	(0.056)
Minimum | HECM buyouts - securitized (performing) | Loss severity
Unobservable Assumptions
Loans held-for-investment, measurement input	0.060	0.034
Minimum | HECM buyouts - securitized (nonperforming) | Loss frequency
Unobservable Assumptions
Loans held-for-investment, measurement input		0.231
Minimum | HECM buyouts - securitized (nonperforming) | Loss severity
Unobservable Assumptions
Loans held-for-investment, measurement input	0.060	0.034
Minimum | Non-agency reverse mortgage loans | LTV
Unobservable Assumptions
Loans held-for-investment, measurement input		0.059
Minimum | Non-agency reverse mortgage loans | HPA
Unobservable Assumptions
Loans held-for-investment, measurement input	(0.068)	(0.056)
Minimum | HECM buyouts (nonperforming) | Loss severity
Unobservable Assumptions
Loans held-for-investment, measurement input	0.060	0.034
Minimum | Non-agency reverse mortgage loan securitizations | WAL (in years)
Unobservable Assumptions
Long-term debt, measurement input	0.1	0.1
Maximum | Discount rate
Unobservable Assumptions
Retained bonds, measurement input	0.153	0.153
Maximum | Loans held for investment, subject to HMBS related obligations | Loss severity
Unobservable Assumptions
Loans held-for-investment, measurement input	0.158	0.159
Maximum | Non-agency reverse mortgage loans - securitized | LTV
Unobservable Assumptions
Loans held-for-investment, measurement input		0.980
Maximum | Non-agency reverse mortgage loans - securitized | HPA
Unobservable Assumptions
Loans held-for-investment, measurement input	0.053	0.083
Maximum | HECM buyouts - securitized (performing) | Loss severity
Unobservable Assumptions
Loans held-for-investment, measurement input	0.133	0.159
Maximum | HECM buyouts - securitized (nonperforming) | Loss frequency
Unobservable Assumptions
Loans held-for-investment, measurement input		1.000
Maximum | HECM buyouts - securitized (nonperforming) | Loss severity
Unobservable Assumptions
Loans held-for-investment, measurement input	0.133	0.159
Maximum | Non-agency reverse mortgage loans | LTV
Unobservable Assumptions
Loans held-for-investment, measurement input		0.706
Maximum | Non-agency reverse mortgage loans | HPA
Unobservable Assumptions
Loans held-for-investment, measurement input	0.053	0.083
Maximum | HECM buyouts (nonperforming) | Loss severity
Unobservable Assumptions
Loans held-for-investment, measurement input	0.133	0.159
Maximum | Non-agency reverse mortgage loan securitizations | WAL (in years)
Unobservable Assumptions
Long-term debt, measurement input	10.5	10.9
Weighted Average | WAL (in years)
Unobservable Assumptions
Retained bonds, measurement input	3.0	3.5
Weighted Average | Discount rate
Unobservable Assumptions
Retained bonds, measurement input	0.071	0.073
Weighted Average | Discount rate | TRA obligation
Unobservable Assumptions
Deferred purchase price liabilities, measurement input	0.266	0.281
Weighted Average | Loans held for investment, subject to HMBS related obligations | WAL (in years)
Unobservable Assumptions
Loans held-for-investment, measurement input	3.1	3.0
Weighted Average | Loans held for investment, subject to HMBS related obligations | CPR
Unobservable Assumptions
Loans held-for-investment, measurement input	0.209	0.216
Weighted Average | Loans held for investment, subject to HMBS related obligations | Loss frequency
Unobservable Assumptions
Loans held-for-investment, measurement input	0.045	0.044
Weighted Average | Loans held for investment, subject to HMBS related obligations | Loss severity
Unobservable Assumptions
Loans held-for-investment, measurement input	0.060	0.035
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 | Loans held for investment, subject to HMBS related obligations | Discount rate
Unobservable Assumptions
Loans held-for-investment, measurement input	0.047	0.053
Weighted Average | Non-agency reverse mortgage loans - securitized | WAL (in years)
Unobservable Assumptions
Loans held-for-investment, measurement input	9.8	10.1
Weighted Average | Non-agency reverse mortgage loans - securitized | CPR
Unobservable Assumptions
Loans held-for-investment, measurement input	0.150	0.148
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	0.063	0.070
Weighted Average | Non-agency reverse mortgage loans - securitized | LTV
Unobservable Assumptions
Loans held-for-investment, measurement input	0.499	0.472
Weighted Average | Non-agency reverse mortgage loans - securitized | HPA
Unobservable Assumptions
Loans held-for-investment, measurement input	0.037	0.036
Weighted Average | HECM buyouts - securitized (performing) | WAL (in years)
Unobservable Assumptions
Loans held-for-investment, measurement input	6.9	7.1
Weighted Average | HECM buyouts - securitized (performing) | CPR
Unobservable Assumptions
Loans held-for-investment, measurement input	0.163	0.151
Weighted Average | HECM buyouts - securitized (performing) | Loss severity
Unobservable Assumptions
Loans held-for-investment, measurement input	0.084	0.047
Weighted Average | HECM buyouts - securitized (performing) | Discount rate
Unobservable Assumptions
Loans held-for-investment, measurement input	0.073	0.080
Weighted Average | HECM buyouts - securitized (nonperforming) | WAL (in years)
Unobservable Assumptions
Loans held-for-investment, measurement input	1.5	1.5
Weighted Average | HECM buyouts - securitized (nonperforming) | CPR
Unobservable Assumptions
Loans held-for-investment, measurement input	0.415	0.400
Weighted Average | HECM buyouts - securitized (nonperforming) | Loss frequency
Unobservable Assumptions
Loans held-for-investment, measurement input	0.455	0.456
Weighted Average | HECM buyouts - securitized (nonperforming) | Loss severity
Unobservable Assumptions
Loans held-for-investment, measurement input	0.068	0.052
Weighted Average | HECM buyouts - securitized (nonperforming) | Discount rate
Unobservable Assumptions
Loans held-for-investment, measurement input	0.068	0.080
Weighted Average | Non-agency reverse mortgage loans | WAL (in years)
Unobservable Assumptions
Loans held-for-investment, measurement input	11.1	10.5
Weighted Average | Non-agency reverse mortgage loans | CPR
Unobservable Assumptions
Loans held-for-investment, measurement input	0.149	0.162
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	0.063	0.071
Weighted Average | Non-agency reverse mortgage loans | LTV
Unobservable Assumptions
Loans held-for-investment, measurement input	0.432	0.351
Weighted Average | Non-agency reverse mortgage loans | HPA
Unobservable Assumptions
Loans held-for-investment, measurement input	0.036	0.035
Weighted Average | HECM buyouts (nonperforming) | WAL (in years)
Unobservable Assumptions
Loans held-for-investment, measurement input	1.3	1.5
Weighted Average | HECM buyouts (nonperforming) | CPR
Unobservable Assumptions
Loans held-for-investment, measurement input	0.454	0.438
Weighted Average | HECM buyouts (nonperforming) | Loss frequency
Unobservable Assumptions
Loans held-for-investment, measurement input	0.423	0.479
Weighted Average | HECM buyouts (nonperforming) | Loss severity
Unobservable Assumptions
Loans held-for-investment, measurement input	0.112	0.105
Weighted Average | HECM buyouts (nonperforming) | Discount rate
Unobservable Assumptions
Loans held-for-investment, measurement input	0.068	0.080
Weighted Average | HMBS related obligations | WAL (in years)
Unobservable Assumptions
Loans held-for-investment, measurement input	3.9	3.8
Weighted Average | HMBS related obligations | CPR
Unobservable Assumptions
Loans held-for-investment, measurement input	0.248	0.248
Weighted Average | HMBS related obligations | Discount rate
Unobservable Assumptions
Loans held-for-investment, measurement input	0.046	0.052
Weighted Average | Non-agency reverse mortgage loan securitizations | WAL (in years)
Unobservable Assumptions
Long-term debt, measurement input	6.4	3.7
Weighted Average | Non-agency reverse mortgage loan securitizations | CPR
Unobservable Assumptions
Long-term debt, measurement input	0.218	0.173
Weighted Average | Non-agency reverse mortgage loan securitizations | Discount rate
Unobservable Assumptions
Long-term debt, measurement input	0.060	0.067
Weighted Average | Performing/nonperforming HECM securitizations | WAL (in years)
Unobservable Assumptions
Long-term debt, measurement input	1.2	1.0
Weighted Average | Performing/nonperforming HECM securitizations | CPR
Unobservable Assumptions
Long-term debt, measurement input	0.574	0.186
Weighted Average | Performing/nonperforming HECM securitizations | Discount rate
Unobservable Assumptions
Long-term debt, measurement input	0.054	0.075