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Fair Value - Schedule of Significant Assumptions used in Valuation (Details) | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
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Loans Held for Investment Reverse Mortgages | Measurement Input, Expected Term |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 6.5 | 6.0
Loans Held for Investment Reverse Mortgages | Measurement Input, Prepayment Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.133 | 0.146
Loans Held for Investment Reverse Mortgages | Measurement Input, Discount Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.018 | 0.028
Loans Held for Investment Reverse Mortgages | Minimum | Measurement Input, Expected Term |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.6 | 2.4
Loans Held for Investment Reverse Mortgages | Minimum | Measurement Input, Prepayment Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.082 | 0.078
Loans Held for Investment Reverse Mortgages | Maximum | Measurement Input, Expected Term |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 8.4 | 7.8
Loans Held for Investment Reverse Mortgages | Maximum | Measurement Input, Prepayment Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.293 | 0.283
Fair Value Agency Mortgage Servicing Rights | Measurement Input, Prepayment Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.157 | 0.117
Fair Value Agency Mortgage Servicing Rights | Measurement Input, Default Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.051 | 0.032
Fair Value Agency Mortgage Servicing Rights | Measurement Input, Discount Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.095 | 0.093
Fair Value Agency Mortgage Servicing Rights | Measurement Input, Weighted Average Cost to Service |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 100 | 85
Fair Value Non-Agency Mortgage Servicing Rights | Measurement Input, Prepayment Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.118 | 0.122
Fair Value Non-Agency Mortgage Servicing Rights | Measurement Input, Default Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.281 | 0.273
Fair Value Non-Agency Mortgage Servicing Rights | Measurement Input, Discount Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.114 | 0.113
Fair Value Non-Agency Mortgage Servicing Rights | Measurement Input, Weighted Average Cost to Service |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 273 | 277
HMBS-Related Borrowings | Measurement Input, Expected Term |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 6.5 | 6.0
HMBS-Related Borrowings | Measurement Input, Prepayment Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.133 | 0.146
HMBS-Related Borrowings | Measurement Input, Discount Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.017 | 0.027
HMBS-Related Borrowings | Minimum | Measurement Input, Expected Term |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.6 | 2.4
HMBS-Related Borrowings | Minimum | Measurement Input, Prepayment Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.082 | 0.078
HMBS-Related Borrowings | Maximum | Measurement Input, Expected Term |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 8.4 | 7.8
HMBS-Related Borrowings | Maximum | Measurement Input, Prepayment Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.293 | 0.283
Mortgage Servicing Rights Pledged | Measurement Input, Prepayment Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.119 | 0.119
Mortgage Servicing Rights Pledged | Measurement Input, Default Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.297 | 0.203
Mortgage Servicing Rights Pledged | Measurement Input, Discount Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.115 | 0.107
Mortgage Servicing Rights Pledged | Measurement Input, Weighted Average Cost to Service |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 288 | 223
5-Year Swap Rate | Fair Value Non-Agency Mortgage Servicing Rights | Measurement Input, Advance Financing Cost, Basis Spread on Variable Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.02 | 0.020
5-Year Swap Rate | Fair Value Non-Agency Mortgage Servicing Rights | Measurement Input, Interest Rate for Computing Float Earnings, Basis Spread on Variable Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.005 | 0.005
5-Year Swap Rate | Mortgage Servicing Rights Pledged | Measurement Input, Advance Financing Cost, Basis Spread on Variable Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.02 | 0.02
5-Year Swap Rate | Mortgage Servicing Rights Pledged | Measurement Input, Interest Rate for Computing Float Earnings, Basis Spread on Variable Rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Measurement input | 0.005 | 0.005

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