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Fair Value - Schedule of Significant Assumptions used in Valuation (Details)	Dec. 31, 2021 years USD ($)	Dec. 31, 2020 years USD ($)
Life in years | Loans Held for Investment
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	5.7	5.9
Life in years | HMBS - Related Borrowings
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	5.7	5.9
Weighted average prepayment speed | Loans Held for Investment
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.160	0.154
Weighted average prepayment speed | Fair Value Agency Mortgage Servicing Rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.085	0.118
Weighted average prepayment speed | Fair Value Non-Agency Mortgage Servicing Rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.121	0.115
Weighted average prepayment speed | HMBS - Related Borrowings
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.160	0.154
Weighted average prepayment speed | Mortgage Servicing Rights Pledged
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.109	0.115
Weighted average delinquency rate | Fair Value Agency Mortgage Servicing Rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.012	0.030
Weighted average delinquency rate | Fair Value Non-Agency Mortgage Servicing Rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.119	0.280
Weighted average delinquency rate | Mortgage Servicing Rights Pledged
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.088	0.298
Weighted average discount rate | Loans Held for Investment
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.026	0.019
Weighted average discount rate | Fair Value Agency Mortgage Servicing Rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.085	0.092
Weighted average discount rate | Fair Value Non-Agency Mortgage Servicing Rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.112	0.114
Weighted average discount rate | HMBS - Related Borrowings
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.025	0.017
Weighted average discount rate | Mortgage Servicing Rights Pledged
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.105	0.114
Weighted average cost to service (in dollars) | Fair Value Agency Mortgage Servicing Rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs | $	71	79
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 | $	205	270
Weighted average cost to service (in dollars) | Mortgage Servicing Rights Pledged
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs | $	182	287
Minimum | Life in years | Loans Held for Investment
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	1.0	0.9
Minimum | Life in years | HMBS - Related Borrowings
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	1.0	0.9
Minimum | Weighted average prepayment speed | Loans Held for Investment
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.112	0.106
Minimum | Weighted average prepayment speed | HMBS - Related Borrowings
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.112	0.106
Maximum | Life in years | Loans Held for Investment
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	8.2	8.0
Maximum | Life in years | HMBS - Related Borrowings
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	8.2	8.0
Maximum | Weighted average prepayment speed | Loans Held for Investment
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.366	0.288
Maximum | Weighted average prepayment speed | HMBS - Related Borrowings
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.366	0.288

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 http://asc.fasb.org/extlink&oid=123874694&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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