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Fair Value - Schedule of Significant Assumptions used in Valuation (Details)	Sep. 30, 2025 year USD ($)	Dec. 31, 2024 year USD ($)
Discount rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.099	0.100
Loans Held for Investment Reverse Mortgages | Discount rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.048	0.054
Loans Held for Investment Reverse Mortgages | Minimum | Life in years
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.6	0.4
Loans Held for Investment Reverse Mortgages | Minimum | Weighted average prepayment speed
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.131	0.131
Loans Held for Investment Reverse Mortgages | Maximum | Life in years
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	7.8	7.6
Loans Held for Investment Reverse Mortgages | Maximum | Weighted average prepayment speed
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.362	0.316
Loans Held for Investment Reverse Mortgages | Weighted Average | Life in years
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	4.7	4.2
Loans Held for Investment Reverse Mortgages | Weighted Average | Weighted average prepayment speed
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.192	0.213
Fair Value Agency Mortgage Servicing Rights | Weighted average prepayment speed
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.070	0.064
Fair Value Agency Mortgage Servicing Rights | Discount rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.094	0.100
Fair Value Agency Mortgage Servicing Rights | Weighted average delinquency rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.012	0.012
Fair Value Agency Mortgage Servicing Rights | Weighted average cost to service (in dollars)
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input | $	71	71
Fair Value Non-Agency Mortgage Servicing Rights | Weighted average prepayment speed
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.077	0.078
Fair Value Non-Agency Mortgage Servicing Rights | Discount rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.109	0.109
Fair Value Non-Agency Mortgage Servicing Rights | Weighted average delinquency rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.108	0.104
Fair Value Non-Agency Mortgage Servicing Rights | Weighted average cost to service (in dollars)
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input | $	195	193
HMBS - Related Borrowings | Discount rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.047	0.053
HMBS - Related Borrowings | Minimum | Life in years
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.6	0.4
HMBS - Related Borrowings | Minimum | Weighted average prepayment speed
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.131	0.131
HMBS - Related Borrowings | Maximum | Life in years
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	7.8	7.6
HMBS - Related Borrowings | Maximum | Weighted average prepayment speed
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.362	0.316
HMBS - Related Borrowings | Weighted Average | Life in years
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	4.7	4.2
HMBS - Related Borrowings | Weighted Average | Weighted average prepayment speed
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.192	0.213
Mortgage Servicing Rights Pledged | Life in years
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	4.8	4.7
Mortgage Servicing Rights Pledged | Weighted average prepayment speed
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.055	0.054
Mortgage Servicing Rights Pledged | Discount rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.097	0.103
Mortgage Servicing Rights Pledged | Weighted average delinquency rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input	0.030	0.030
Mortgage Servicing Rights Pledged | Weighted average cost to service (in dollars)
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Measurement input | $	131	133

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