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Fair Value of Financial Instruments - Schedule of Changes in Unrealized Gains (Losses) Included in Earnings for Level 3 Assets and Liabilities (Details) - Level 3 - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Consolidated SLST | VIE, Primary Beneficiary
Assets
Unrealized gains (losses)	$ 7,395	$ 28,655	$ 37,100	$ 27,855
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Unrealized gains, net	Unrealized gains, net	Unrealized gains, net	Unrealized gains, net
Residential loans
Assets
Unrealized gains (losses)	$ 1,110	$ 2,305	$ (3,557)	$ (3,768)
Residential Loans Held in Securitization Trusts
Assets
Unrealized gains (losses)	16,774	42,170	50,064	34,918
Residential Loans Held for Sale
Assets
Unrealized gains (losses)	2,552	0	2,552	0
Multi-family loans
Assets
Unrealized gains (losses)	123	176	479	(4,613)
Equity investments
Assets
Unrealized gains (losses)	(2,860)	(1,097)	(2,368)	(7,677)
IRLCs
Assets
Unrealized gains (losses)	2,383	0	2,383	0
MSRs
Assets
Unrealized gains (losses)	(1,019)	0	(2,573)	0
Collateralized Debt Obligations | Consolidated SLST | VIE, Primary Beneficiary
Liabilities
Unrealized gains (losses)	$ (4,955)	$ (21,902)	$ (25,875)	$ (20,596)
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Unrealized gains, net	Unrealized gains, net	Unrealized gains, net	Unrealized gains, net

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