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Fair Value - Schedule of Significant Assumptions used in Valuation (Details)	Dec. 31, 2020 years USD ($)	Dec. 31, 2019 years USD ($)
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

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=117815213&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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