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Fair Value - Schedule of Significant Assumptions used in Valuation (Details)	Sep. 30, 2023 year USD ($)	Dec. 31, 2022 year USD ($)
Discount rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.095	0.076
Loans Held for Investment Reverse Mortgages | Life in years
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	4.9	5.0
Loans Held for Investment Reverse Mortgages | Weighted average prepayment speed
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.183	0.180
Loans Held for Investment Reverse Mortgages | Discount rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.057	0.051
Loans Held for Investment Reverse Mortgages | Minimum | Life in years
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.8	1.0
Loans Held for Investment Reverse Mortgages | Minimum | Weighted average prepayment speed
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.121	0.132
Loans Held for Investment Reverse Mortgages | Maximum | Life in years
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	7.5	7.6
Loans Held for Investment Reverse Mortgages | Maximum | Weighted average prepayment speed
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.407	0.450
Fair Value Agency Mortgage Servicing Rights | Weighted average prepayment speed
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.067	0.069
Fair Value Agency Mortgage Servicing Rights | Weighted average lifetime delinquency rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.012	0.014
Fair Value Agency Mortgage Servicing Rights | Discount rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.097	0.096
Fair Value Agency Mortgage Servicing Rights | Weighted average cost to service (in dollars)
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input | $	71	72
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 | Weighted average lifetime delinquency rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.104	0.101
Fair Value Non-Agency Mortgage Servicing Rights | Discount rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.106	0.106
Fair Value Non-Agency Mortgage Servicing Rights | Weighted average cost to service (in dollars)
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input | $	201	201
HMBS-Related Borrowings | Life in years
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	4.9	5.0
HMBS-Related Borrowings | Weighted average prepayment speed
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.183	0.180
HMBS-Related Borrowings | Discount rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.056	0.050
HMBS-Related Borrowings | Minimum | Life in years
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.8	1.0
HMBS-Related Borrowings | Minimum | Weighted average prepayment speed
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.121	0.132
HMBS-Related Borrowings | Maximum | Life in years
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	7.5	7.6
HMBS-Related Borrowings | Maximum | Weighted average prepayment speed
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.407	0.450
Mortgage Servicing Rights Pledged | Life in years
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	4.5	5.6
Mortgage Servicing Rights Pledged | Weighted average prepayment speed
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.070	0.076
Mortgage Servicing Rights Pledged | Weighted average lifetime delinquency rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.061	0.071
Mortgage Servicing Rights Pledged | Discount rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.101	0.102
Mortgage Servicing Rights Pledged | Weighted average cost to service (in dollars)
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input | $	163	174

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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- Definition

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+ References

No definition available.

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