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Residential Loans, at Fair Value - Schedule of Residential Loans at Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal	$ 3,401,330	$ 3,898,260
(Discount)/premium	(85,621)	(88,739)
Unrealized losses	(321,814)	(284,441)
Carrying value	2,993,895	3,525,080
Consolidated SLST | VIE, Primary Beneficiary
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal	910,222	955,579
(Discount)/premium	(7,206)	(5,815)
Unrealized losses	(160,412)	(122,182)
Carrying value	742,604	827,582
Residential loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal	815,311	1,152,502
(Discount)/premium	(22,336)	(22,179)
Unrealized losses	(56,036)	(48,939)
Carrying value	736,939	1,081,384
Residential loans held in securitization trusts
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal	1,675,797	1,790,179
(Discount)/premium	(56,079)	(60,745)
Unrealized losses	(105,366)	(113,320)
Carrying value	$ 1,514,352	$ 1,616,114

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- Definition

Residential Mortgage Loans, Accumulated Gross Unrealized Gain(loss), before Tax

+ References

No definition available.

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- Definition

Amount of contractual principal due at origination of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Subsection 29
-Paragraph Column F
-Publisher SEC

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 948
-SubTopic 310
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column F))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479851/948-310-S99-1

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Subsection 29
-Publisher SEC

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 948
-SubTopic 310
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479851/948-310-S99-1

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Amount of investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 948
-SubTopic 310
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column G))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479851/948-310-S99-1

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