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Fair Value - Schedule of Significant Assumptions used in Valuation (Details) | Sep. 30, 2021 years USD ($) | Dec. 31, 2020 USD ($) years
--- | --- | ---
Loans Held for Investment Reverse Mortgages | Measurement Input, Expected Term |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 5.6 | 5.9
Loans Held for Investment Reverse Mortgages | Measurement Input, Prepayment Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.162 | 0.154
Loans Held for Investment Reverse Mortgages | Measurement Input, Discount Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.025 | 0.019
Loans Held for Investment Reverse Mortgages | Minimum | Measurement Input, Expected Term |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 1.1 | 0.9
Loans Held for Investment Reverse Mortgages | Minimum | Measurement Input, Prepayment Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.110 | 0.106
Loans Held for Investment Reverse Mortgages | Maximum | Measurement Input, Expected Term |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 8.0 | 8.0
Loans Held for Investment Reverse Mortgages | Maximum | Measurement Input, Prepayment Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.355 | 0.288
Fair Value Agency Mortgage Servicing Rights | Measurement Input, Prepayment Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.090 | 0.118
Fair Value Agency Mortgage Servicing Rights | Measurement Input, Default Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.014 | 0.030
Fair Value Agency Mortgage Servicing Rights | Measurement Input, Discount Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.086 | 0.092
Fair Value Agency Mortgage Servicing Rights | Measurement Input, Weighted Average Cost to Service |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | $ | 72 | 79
Fair Value Non-Agency Mortgage Servicing Rights | Measurement Input, Prepayment Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.120 | 0.115
Fair Value Non-Agency Mortgage Servicing Rights | Measurement Input, Default Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.128 | 0.280
Fair Value Non-Agency Mortgage Servicing Rights | Measurement Input, Discount Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.112 | 0.114
Fair Value Non-Agency Mortgage Servicing Rights | Measurement Input, Weighted Average Cost to Service |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | $ | 209 | 270
HMBS-Related Borrowings | Measurement Input, Expected Term |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 5.6 | 5.9
HMBS-Related Borrowings | Measurement Input, Prepayment Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.162 | 0.154
HMBS-Related Borrowings | Measurement Input, Discount Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.023 | 0.017
HMBS-Related Borrowings | Minimum | Measurement Input, Expected Term |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 1.1 | 0.9
HMBS-Related Borrowings | Minimum | Measurement Input, Prepayment Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.110 | 0.106
HMBS-Related Borrowings | Maximum | Measurement Input, Expected Term |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 8.0 | 8.0
HMBS-Related Borrowings | Maximum | Measurement Input, Prepayment Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.355 | 0.288
Mortgage Servicing Rights Pledged | Measurement Input, Prepayment Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.112 | 0.115
Mortgage Servicing Rights Pledged | Measurement Input, Default Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.112 | 0.298
Mortgage Servicing Rights Pledged | Measurement Input, Discount Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.107 | 0.114
Mortgage Servicing Rights Pledged | Measurement Input, Weighted Average Cost to Service |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | $ | 199 | 287

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