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Fair Value - Schedule of Significant Assumptions used in Valuation (Details) | Mar. 31, 2024 USD ($) year | Dec. 31, 2023 year USD ($)
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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 | 0.052 | 0.049
Loans Held for Investment Reverse Mortgages | Minimum | Life in years |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.8 | 0.8
Loans Held for Investment Reverse Mortgages | Minimum | Weighted average prepayment speed |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.116 | 0.120
Loans Held for Investment Reverse Mortgages | Maximum | Life in years |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 8.0 | 7.9
Loans Held for Investment Reverse Mortgages | Maximum | Weighted average prepayment speed |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.355 | 0.354
Loans Held for Investment Reverse Mortgages | Weighted Average | Life in years |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 5.1 | 5.2
Loans Held for Investment Reverse Mortgages | Weighted Average | Weighted average prepayment speed |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.175 | 0.172
Fair Value Agency Mortgage Servicing Rights | Weighted average prepayment speed |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.065 | 0.077
Fair Value Agency Mortgage Servicing Rights | Discount rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.101 | 0.092
Fair Value Agency Mortgage Servicing Rights | Weighted average lifetime delinquency rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.013 | 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 | $ | 71 | 71
Fair Value Non-Agency Mortgage Servicing Rights | Weighted average prepayment speed |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.079 | 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 | 0.103 | 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 | $ | 195 | 192
HMBS-Related Borrowings | Discount rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.051 | 0.049
HMBS-Related Borrowings | Minimum | Life in years |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.8 | 0.8
HMBS-Related Borrowings | Minimum | Weighted average prepayment speed |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.116 | 0.120
HMBS-Related Borrowings | Maximum | Life in years |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 8.0 | 7.9
HMBS-Related Borrowings | Maximum | Weighted average prepayment speed |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.355 | 0.354
HMBS-Related Borrowings | Weighted Average | Life in years |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 5.1 | 5.2
HMBS-Related Borrowings | Weighted Average | Weighted average prepayment speed |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.175 | 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 | 0.054 | 0.065
Mortgage Servicing Rights Pledged | Discount rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.106 | 0.096
Mortgage Servicing Rights Pledged | Weighted average lifetime delinquency rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.028 | 0.028
Mortgage Servicing Rights Pledged | Weighted average cost to service (in dollars) |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | $ | 132 | 130

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