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Fair Value - Schedule of Significant Assumptions used in Valuation (Details)	Dec. 31, 2022 year USD ($)	Dec. 31, 2021 USD ($) year
Life in years | Loans Held for Investment
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	5.0	5.7
Life in years | HMBS - Related Borrowings
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	5.0	5.7
Weighted average prepayment speed | Loans Held for Investment
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.180	0.160
Weighted average prepayment speed | Fair Value Agency Mortgage Servicing Rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.069	0.085
Weighted average prepayment speed | Fair Value Non-Agency Mortgage Servicing Rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.079	0.121
Weighted average prepayment speed | HMBS - Related Borrowings
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.180	0.160
Weighted average prepayment speed | Mortgage Servicing Rights Pledged
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.076	0.109
Weighted average delinquency rate | Fair Value Agency Mortgage Servicing Rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.014	0.012
Weighted average delinquency rate | Fair Value Non-Agency Mortgage Servicing Rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.101	0.119
Weighted average delinquency rate | Mortgage Servicing Rights Pledged
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.071	0.088
Weighted average discount rate | Loans Held for Investment
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.051	0.026
Weighted average discount rate | Fair Value Agency Mortgage Servicing Rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.096	0.085
Weighted average discount rate | Fair Value Non-Agency Mortgage Servicing Rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.106	0.112
Weighted average discount rate | HMBS - Related Borrowings
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.050	0.025
Weighted average discount rate | Mortgage Servicing Rights Pledged
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.102	0.105
Weighted average cost to service (in dollars) | Fair Value Agency Mortgage Servicing Rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs | $	72	71
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 | $	201	205
Weighted average cost to service (in dollars) | Mortgage Servicing Rights Pledged
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs | $	174	182
Minimum | Life in years | Loans Held for Investment
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	1.0	1.0
Minimum | Life in years | HMBS - Related Borrowings
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	1.0	1.0
Minimum | Weighted average prepayment speed | Loans Held for Investment
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.132	0.112
Minimum | Weighted average prepayment speed | HMBS - Related Borrowings
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.132	0.112
Maximum | Life in years | Loans Held for Investment
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	7.6	8.2
Maximum | Life in years | HMBS - Related Borrowings
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	7.6	8.2
Maximum | Weighted average prepayment speed | Loans Held for Investment
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.450	0.366
Maximum | Weighted average prepayment speed | HMBS - Related Borrowings
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.450	0.366

X

- Definition

Value of input used to measure alternative investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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