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Fair Value of Financial Instruments - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value option elected aggregate carrying amount, asset	$ 59,000	$ 108,000
Residential Loans
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value option elected aggregate carrying amount, asset	12,920,000	4,370,000
Business purpose residential loans, held-for-sale, at fair value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value option elected aggregate carrying amount, asset	2,220,000	1,400,000
Acquisitions	136,685	0
HEIs
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Acquisitions	155,023	3,517
MSRs and Other Investments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Acquisitions	15,215	450
Multifamily loans, held-for-investment, at fair value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Acquisitions	0	0
Servicer advance investments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value option elected aggregate carrying amount, asset	197,000	179,000
Excess MSRs
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value option elected aggregate carrying amount, asset	18,000	$ 11,000
Home Appreciation Option
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value option elected aggregate carrying amount, asset	$ 15,000

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- Definition

Fair Value, Option, Assets, Aggregate Carrying Amount During Period

+ References

No definition available.

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- Definition

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

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- Definition

Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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