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Residential Investor Loans - Additional Information (Details) $ in Thousands	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2024 USD ($) loan	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal payments on real estate securities		$ 5,331	$ 950
Commitment To Fund Residential Investor Bridge Loan
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Commitment to fund loan	$ 429,000	$ 429,000
SOFR
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Real estate owned, rate (as a percent)		62.00%
Fixed Rate
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Real estate owned, rate (as a percent)		38.00%
Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Weighted average term increase from modification	16 months
Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Weighted average term increase from modification	19 months
Bridge Loans | Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Residential bridge loans held-for-investment, original maturities (in months)		6 months
Bridge Loans | Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Residential bridge loans held-for-investment, original maturities (in months)		36 months
Residential Investor Bridge
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans sold	$ 66,000	$ 253,000
Principal payments on real estate securities	13,000	34,000
Financing receivable, modified in period, amount	$ 116,000	1,910,000		$ 2,100,000
Number of modified loans | loan	2
Unpaid principal balance	$ 364,000	364,000		340,000
Fair value of loans	$ 320,000	$ 320,000		312,000
Deferred interest	10.49%	10.49%
Residential Investor Bridge | Financing Receivables Less Than 90 Days Past Due
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	$ 215,000	$ 215,000		$ 207,000
Residential Investor Bridge | Payment Deferral
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Financing receivable, modified in period, amount	$ 228,000
Deferred interest	4.86%	4.86%
Residential Investor Bridge | Interest Rate Below Market Reduction
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Financing receivable, modified in period, amount		$ 113,000
Residential Investor Bridge | Estimated Fair Value
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Financing receivable, modified in period, amount	$ 115,000
Residential Investor Bridge | Estimated Fair Value | Interest Rate Below Market Reduction
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Financing receivable, modified in period, amount		$ 111,000
Financial Instrument, Term One | Residential Investor Term Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Financing receivable, term	3 years	3 years
Financial Instrument, Term Two | Residential Investor Term Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Financing receivable, term	5 years	5 years
Financial Instrument, Term Three | Residential Investor Term Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Financing receivable, term	7 years	7 years
Financial Instrument, Term Four | Residential Investor Term Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Financing receivable, term	10 years	10 years

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