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Fair Value - Schedule of Significant Assumptions used in Valuation (Details) | Dec. 31, 2020 years USD ($) | Dec. 31, 2019 years USD ($)
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Life in years | Loans Held for Investment |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement inputs | 5.9 | 6.0
Life in years | HMBS - Related Borrowings |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement inputs | 5.9 | 6.0
Weighted average prepayment speed | Loans Held for Investment |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement inputs | 0.154 | 0.146
Weighted average prepayment speed | Fair Value Agency Mortgage Servicing Rights |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement inputs | 0.118 | 0.117
Weighted average prepayment speed | Fair Value Non-Agency Mortgage Servicing Rights |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement inputs | 0.115 | 0.122
Weighted average prepayment speed | HMBS - Related Borrowings |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement inputs | 0.154 | 0.146
Weighted average prepayment speed | Mortgage Servicing Rights Pledged |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement inputs | 0.115 | 0.119
Weighted average delinquency rate | Fair Value Agency Mortgage Servicing Rights |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement inputs | 0.030 | 0.032
Weighted average delinquency rate | Fair Value Non-Agency Mortgage Servicing Rights |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement inputs | 0.280 | 0.273
Weighted average delinquency rate | Mortgage Servicing Rights Pledged |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement inputs | 0.298 | 0.203
Weighted average discount rate | Loans Held for Investment |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement inputs | 0.019 | 0.028
Weighted average discount rate | Fair Value Agency Mortgage Servicing Rights |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement inputs | 0.092 | 0.093
Weighted average discount rate | Fair Value Non-Agency Mortgage Servicing Rights |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement inputs | 0.114 | 0.113
Weighted average discount rate | HMBS - Related Borrowings |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement inputs | 0.017 | 0.027
Weighted average discount rate | Mortgage Servicing Rights Pledged |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement inputs | 0.114 | 0.107
Weighted average cost to service (in dollars) | Fair Value Agency Mortgage Servicing Rights |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement inputs | $ | 79 | 85
Weighted average cost to service (in dollars) | Fair Value Non-Agency Mortgage Servicing Rights |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement inputs | $ | 270 | 277
Weighted average cost to service (in dollars) | Mortgage Servicing Rights Pledged |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement inputs | $ | 287 | 223
Minimum | Life in years | Loans Held for Investment |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement inputs | 0.9 | 2.4
Minimum | Life in years | HMBS - Related Borrowings |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement inputs | 0.9 | 2.4
Minimum | Weighted average prepayment speed | Loans Held for Investment |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement inputs | 0.106 | 0.078
Minimum | Weighted average prepayment speed | HMBS - Related Borrowings |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement inputs | 0.106 | 0.078
Maximum | Life in years | Loans Held for Investment |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement inputs | 8.0 | 7.8
Maximum | Life in years | HMBS - Related Borrowings |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement inputs | 8.0 | 7.8
Maximum | Weighted average prepayment speed | Loans Held for Investment |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement inputs | 0.288 | 0.283
Maximum | Weighted average prepayment speed | HMBS - Related Borrowings |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement inputs | 0.288 | 0.283

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