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Fair Value - Schedule of Significant Assumptions used in Valuation (Details) | Sep. 30, 2024 year USD ($) | Dec. 31, 2023 USD ($) year
--- | --- | ---
Discount rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.094 | 0.094
Loans Held for Investment Reverse Mortgages | Discount rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.047 | 0.049
Loans Held for Investment Reverse Mortgages | Minimum | Life in years |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.5 | 0.8
Loans Held for Investment Reverse Mortgages | Minimum | Weighted average prepayment speed |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.113 | 0.120
Loans Held for Investment Reverse Mortgages | Maximum | Life in years |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 7.9 | 7.9
Loans Held for Investment Reverse Mortgages | Maximum | Weighted average prepayment speed |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.317 | 0.354
Loans Held for Investment Reverse Mortgages | Weighted Average | Life in years |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 5.3 | 5.2
Loans Held for Investment Reverse Mortgages | Weighted Average | Weighted average prepayment speed |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.169 | 0.172
Fair Value Agency Mortgage Servicing Rights | Weighted average prepayment speed |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.070 | 0.077
Fair Value Agency Mortgage Servicing Rights | Discount rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.091 | 0.092
Fair Value Agency Mortgage Servicing Rights | Weighted average lifetime delinquency rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.012 | 0.013
Fair Value Agency Mortgage Servicing Rights | Weighted average cost to service (in dollars) |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | $ | 72 | 71
Fair Value Non-Agency Mortgage Servicing Rights | Weighted average prepayment speed |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.078 | 0.079
Fair Value Non-Agency Mortgage Servicing Rights | Discount rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.109 | 0.114
Fair Value Non-Agency Mortgage Servicing Rights | Weighted average lifetime delinquency rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.101 | 0.100
Fair Value Non-Agency Mortgage Servicing Rights | Weighted average cost to service (in dollars) |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | $ | 192 | 192
HMBS - Related Borrowings | Discount rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.046 | 0.049
HMBS - Related Borrowings | Minimum | Life in years |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.5 | 0.8
HMBS - Related Borrowings | Minimum | Weighted average prepayment speed |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.113 | 0.120
HMBS - Related Borrowings | Maximum | Life in years |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 7.9 | 7.9
HMBS - Related Borrowings | Maximum | Weighted average prepayment speed |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.317 | 0.354
HMBS - Related Borrowings | Weighted Average | Life in years |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 5.3 | 5.2
HMBS - Related Borrowings | Weighted Average | Weighted average prepayment speed |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.169 | 0.172
Mortgage Servicing Rights Pledged | Life in years |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 4.6 | 4.3
Mortgage Servicing Rights Pledged | Weighted average prepayment speed |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.055 | 0.065
Mortgage Servicing Rights Pledged | Discount rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.097 | 0.096
Mortgage Servicing Rights Pledged | Weighted average lifetime delinquency rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.030 | 0.028
Mortgage Servicing Rights Pledged | Weighted average cost to service (in dollars) |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | $ | 133 | 130

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