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Fair Value - Schedule of Significant Assumptions used in Valuation (Details)	Dec. 31, 2024 year USD ($)	Dec. 31, 2023 year USD ($)
Life in years | Loans Held for Investment
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	4.2	5.2
Life in years | HMBS - Related Borrowings
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	4.2	5.2
Life in years | Mortgage Servicing Rights Pledged
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	4.7	4.3
Weighted average prepayment speed | Loans Held for Investment
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.213	0.172
Weighted average prepayment speed | Fair Value Agency Mortgage Servicing Rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.064	0.077
Weighted average prepayment speed | Fair Value Non Agency Mortgage Servicing Rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.078	0.079
Weighted average prepayment speed | HMBS - Related Borrowings
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.213	0.172
Weighted average prepayment speed | Mortgage Servicing Rights Pledged
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.054	0.065
Weighted average delinquency rate | Fair Value Agency Mortgage Servicing Rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.012	0.013
Weighted average delinquency rate | Fair Value Non Agency Mortgage Servicing Rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.104	0.100
Weighted average delinquency rate | Mortgage Servicing Rights Pledged
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.030	0.028
Weighted average discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.100	0.094
Weighted average discount rate | Loans Held for Investment
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.054	0.049
Weighted average discount rate | Fair Value Agency Mortgage Servicing Rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.100	0.092
Weighted average discount rate | Fair Value Non Agency Mortgage Servicing Rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.109	0.114
Weighted average discount rate | HMBS - Related Borrowings
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.053	0.049
Weighted average discount rate | Mortgage Servicing Rights Pledged
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.103	0.096
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	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 | $	193	192
Weighted average cost to service (in dollars) | Mortgage Servicing Rights Pledged
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs | $	133	130
Minimum | Life in years | Loans Held for Investment
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.4	0.8
Minimum | Life in years | HMBS - Related Borrowings
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.4	0.8
Minimum | Weighted average prepayment speed | Loans Held for Investment
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.131	0.120
Minimum | Weighted average prepayment speed | HMBS - Related Borrowings
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.131	0.120
Maximum | Life in years | Loans Held for Investment
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	7.6	7.9
Maximum | Life in years | HMBS - Related Borrowings
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	7.6	7.9
Maximum | Weighted average prepayment speed | Loans Held for Investment
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.316	0.354
Maximum | Weighted average prepayment speed | HMBS - Related Borrowings
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.316	0.354

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
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-Name Accounting Standards Codification
-Section 55
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-URI https://asc.fasb.org/1943274/2147482078/820-10-55-103

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X

- Definition

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
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-URI https://asc.fasb.org/1943274/2147482078/820-10-55-103

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