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Fair Value - Schedule of Significant Assumptions used in Valuation (Details) | Jun. 30, 2022 year USD ($) | Dec. 31, 2021 USD ($) year
--- | --- | ---
Loans Held for Investment Reverse Mortgages | Life in years |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 5.2 | 5.7
Loans Held for Investment Reverse Mortgages | Weighted average prepayment speed |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.173 | 0.160
Loans Held for Investment Reverse Mortgages | Discount rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.042 | 0.026
Loans Held for Investment Reverse Mortgages | Minimum | Life in years |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 1.1 | 1.0
Loans Held for Investment Reverse Mortgages | Minimum | Weighted average prepayment speed |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.119 | 0.112
Loans Held for Investment Reverse Mortgages | Maximum | Life in years |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 9.5 | 8.2
Loans Held for Investment Reverse Mortgages | Maximum | Weighted average prepayment speed |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.470 | 0.366
Fair Value Agency Mortgage Servicing Rights | Weighted average prepayment speed |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.069 | 0.085
Fair Value Agency Mortgage Servicing Rights | Weighted average lifetime delinquency rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.011 | 0.012
Fair Value Agency Mortgage Servicing Rights | Discount rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.085 | 0.085
Fair Value Agency Mortgage Servicing Rights | Weighted average cost to service (in dollars) |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | $ | 70 | 71
Fair Value Non-Agency Mortgage Servicing Rights | Weighted average prepayment speed |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.120 | 0.121
Fair Value Non-Agency Mortgage Servicing Rights | Weighted average lifetime delinquency rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.108 | 0.119
Fair Value Non-Agency Mortgage Servicing Rights | Discount rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.107 | 0.112
Fair Value Non-Agency Mortgage Servicing Rights | Weighted average cost to service (in dollars) |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | $ | 199 | 205
HMBS-Related Borrowings | Life in years |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 5.2 | 5.7
HMBS-Related Borrowings | Weighted average prepayment speed |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.173 | 0.160
HMBS-Related Borrowings | Discount rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.042 | 0.025
HMBS-Related Borrowings | Minimum | Life in years |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 1.1 | 1.0
HMBS-Related Borrowings | Minimum | Weighted average prepayment speed |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.119 | 0.112
HMBS-Related Borrowings | Maximum | Life in years |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 9.5 | 8.2
HMBS-Related Borrowings | Maximum | Weighted average prepayment speed |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.470 | 0.366
Mortgage Servicing Rights Pledged | Weighted average prepayment speed |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.102 | 0.109
Mortgage Servicing Rights Pledged | Weighted average lifetime delinquency rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.074 | 0.088
Mortgage Servicing Rights Pledged | Discount rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.100 | 0.105
Mortgage Servicing Rights Pledged | Weighted average cost to service (in dollars) |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | $ | 171 | 182

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