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Fair Value - Schedule of Significant Assumptions used in Valuation (Details) | Mar. 31, 2021 years USD ($) | Dec. 31, 2020 years USD ($)
--- | --- | ---
Loans Held for Investment Reverse Mortgages | Measurement Input, Expected Term |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 5.5 | 5.9
Loans Held for Investment Reverse Mortgages | Measurement Input, Prepayment Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.165 | 0.154
Loans Held for Investment Reverse Mortgages | Measurement Input, Discount Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.024 | 0.019
Loans Held for Investment Reverse Mortgages | Minimum | Measurement Input, Expected Term |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.9 | 0.9
Loans Held for Investment Reverse Mortgages | Minimum | Measurement Input, Prepayment Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.107 | 0.106
Loans Held for Investment Reverse Mortgages | Maximum | Measurement Input, Expected Term |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 7.9 | 8.0
Loans Held for Investment Reverse Mortgages | Maximum | Measurement Input, Prepayment Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.376 | 0.288
Fair Value Agency Mortgage Servicing Rights | Measurement Input, Prepayment Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.100 | 0.118
Fair Value Agency Mortgage Servicing Rights | Measurement Input, Default Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.026 | 0.030
Fair Value Agency Mortgage Servicing Rights | Measurement Input, Discount Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.092 | 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 | $ | 76 | 79
Fair Value Non-Agency Mortgage Servicing Rights | Measurement Input, Prepayment Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.114 | 0.115
Fair Value Non-Agency Mortgage Servicing Rights | Measurement Input, Default Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.278 | 0.280
Fair Value Non-Agency Mortgage Servicing Rights | Measurement Input, Discount Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.115 | 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 | $ | 270 | 270
HMBS-Related Borrowings | Measurement Input, Expected Term |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 5.9 | 5.9
HMBS-Related Borrowings | Measurement Input, Prepayment Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.165 | 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 | 0.9 | 0.9
HMBS-Related Borrowings | Minimum | Measurement Input, Prepayment Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.107 | 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 | 0.376 | 0.288
Mortgage Servicing Rights Pledged | Measurement Input, Prepayment Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.114 | 0.115
Mortgage Servicing Rights Pledged | Measurement Input, Default Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.295 | 0.298
Mortgage Servicing Rights Pledged | Measurement Input, Discount Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.115 | 0.114
Mortgage Servicing Rights Pledged | Measurement Input, Weighted Average Cost to Service |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | $ | 286 | 287

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