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Residential Loans - Activity of Residential Loans Held-for-Sale (Details) - Residential Loans $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) securitization	Dec. 31, 2020 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal balance of loans acquired (1)	$ 12,916,155	$ 4,374,201
Principal balance of loans sold	8,244,221	6,463,741
Principal balance of loans transferred to HFI	2,957,694	274,048
Gain (loss) on assets measured at fair value on a non-recurring basis	76,144	$ (15,477)
Legacy Sequoia
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal balance of loans acquired (1)	$ 200,000
Number of seasoned securitizations | securitization	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 http://asc.fasb.org/extlink&oid=123596393&loc=d3e14172-108612

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