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Fair Value - Schedule of Significant Assumptions used in Valuation (Details)	Sep. 30, 2024 year USD ($)	Dec. 31, 2023 USD ($) year
Discount rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.094	0.094
Loans Held for Investment Reverse Mortgages | Discount rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.047	0.049
Loans Held for Investment Reverse Mortgages | Minimum | Life in years
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.5	0.8
Loans Held for Investment Reverse Mortgages | Minimum | Weighted average prepayment speed
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.113	0.120
Loans Held for Investment Reverse Mortgages | Maximum | Life in years
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	7.9	7.9
Loans Held for Investment Reverse Mortgages | Maximum | Weighted average prepayment speed
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.317	0.354
Loans Held for Investment Reverse Mortgages | Weighted Average | Life in years
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	5.3	5.2
Loans Held for Investment Reverse Mortgages | Weighted Average | Weighted average prepayment speed
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.169	0.172
Fair Value Agency Mortgage Servicing Rights | Weighted average prepayment speed
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.070	0.077
Fair Value Agency Mortgage Servicing Rights | Discount rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.091	0.092
Fair Value Agency Mortgage Servicing Rights | Weighted average lifetime delinquency rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.012	0.013
Fair Value Agency Mortgage Servicing Rights | Weighted average cost to service (in dollars)
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input | $	72	71
Fair Value Non-Agency Mortgage Servicing Rights | Weighted average prepayment speed
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.078	0.079
Fair Value Non-Agency Mortgage Servicing Rights | Discount rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.109	0.114
Fair Value Non-Agency Mortgage Servicing Rights | Weighted average lifetime delinquency rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.101	0.100
Fair Value Non-Agency Mortgage Servicing Rights | Weighted average cost to service (in dollars)
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input | $	192	192
HMBS - Related Borrowings | Discount rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.046	0.049
HMBS - Related Borrowings | Minimum | Life in years
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.5	0.8
HMBS - Related Borrowings | Minimum | Weighted average prepayment speed
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.113	0.120
HMBS - Related Borrowings | Maximum | Life in years
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	7.9	7.9
HMBS - Related Borrowings | Maximum | Weighted average prepayment speed
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.317	0.354
HMBS - Related Borrowings | Weighted Average | Life in years
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	5.3	5.2
HMBS - Related Borrowings | Weighted Average | Weighted average prepayment speed
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.169	0.172
Mortgage Servicing Rights Pledged | Life in years
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	4.6	4.3
Mortgage Servicing Rights Pledged | Weighted average prepayment speed
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.055	0.065
Mortgage Servicing Rights Pledged | Discount rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.097	0.096
Mortgage Servicing Rights Pledged | Weighted average lifetime delinquency rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.030	0.028
Mortgage Servicing Rights Pledged | Weighted average cost to service (in dollars)
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input | $	133	130

X

- Definition

Value of input used to measure alternative investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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- Definition

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+ References

No definition available.

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