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Fair Value of Financial Instruments - Additional Information (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2023 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying value of investments	$ 6,000	$ 6,000
Securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value option elected aggregate carrying amount, asset	0	8,000
Residential Loans
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Acquisitions	858,000	1,100,000
Acquisitions		1,050,444
Business purpose loans
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value option elected aggregate carrying amount, asset	411,000	1,260,000
Acquisitions		0
HEIs
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Acquisitions	100	26,000
MSRs
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Acquisitions	$ 0	$ 500

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- Definition

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Price Paid

+ References

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- Definition

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

+ References

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- Definition

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+ 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
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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- Definition

Sum of the carrying amounts as of the balance sheet date of all investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1)(h))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1

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