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Residential Loans - Activity of Residential Loans Held-for-Sale (Details) - Residential Loans $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) securitization	Dec. 31, 2021 USD ($) securitization
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal balance of loans acquired	$ 3,704,196	$ 12,916,155
Principal balance of loans sold	3,858,647	8,244,221
Principal balance of loans transferred to HFI	687,192	2,957,694
Gain (loss) on assets measured at fair value on a non-recurring basis	(93,843)	76,144
Legacy Sequoia
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal balance of loans acquired	$ 102,000	$ 200,000
Number of seasoned securitizations | securitization	3	7

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=123596393&loc=d3e14172-108612

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