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Residential Loans and Residential Loans Held for Sale, at Fair Value - Schedule of Components of Net Gain (Loss) on Residential Mortgage Loans at Fair Value (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
VIE, Primary Beneficiary | Consolidated SLST
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Unrealized gains (losses), net	$ 7,395	$ 28,655	$ 37,100	$ 27,855
Residential loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Unrealized gains (losses), net	6,575	9,882	14,552	13,934
Residential loans held in securitization trusts
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Unrealized gains (losses), net	$ 12,958	$ 42,283	$ 45,711	$ 32,995

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Unrealized Gain (Loss) On Real Estate Mortgage Loans, Net

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