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Residential Loans, at Fair Value - Schedule of Residential Loans at Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal	$ 4,255,727	$ 3,529,804
(Discount)/premium	(89,448)	(84,265)
Unrealized (losses) gains	(233,103)	130,062
Carrying value	3,933,176	3,575,601
Consolidated SLST | VIE, Primary Beneficiary
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal	973,944	1,071,228
(Discount)/premium	(5,180)	(2,998)
Unrealized (losses) gains	(107,979)	2,652
Carrying value	860,785	1,070,882
Residential loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal	1,758,811	1,682,138
(Discount)/premium	(16,202)	(44,256)
Unrealized (losses) gains	(81,291)	65,408
Carrying value	1,661,318	1,703,290
Residential loans held in securitization trusts
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal	1,522,972	776,438
(Discount)/premium	(68,066)	(37,011)
Unrealized (losses) gains	(43,833)	62,002
Carrying value	$ 1,411,073	$ 801,429

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

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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
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Paragraph Column F
-Subsection 29

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column F))
-URI https://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014

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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.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column G))
-URI https://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014

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