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Residential Whole Loans - Net Gain/(Loss) on Residential Whole Loans Measured at Fair Value (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net gain/(loss) on residential whole loans measured at fair value through earnings	$ 143,416	$ (132,894)	$ 148,333	$ (134,423)
Residential whole loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net gain/(loss) on residential whole loans measured at fair value through earnings	143,416	(132,894)	148,333	(134,423)
Residential whole loan | Business purpose loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net gain/(loss) on residential whole loans measured at fair value through earnings	26,679	(35,676)	13,092	(35,096)
Residential whole loan | Business purpose loans | Single-family transitional loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net gain/(loss) on residential whole loans measured at fair value through earnings	2,401	688	(1,720)	1,085
Residential whole loan | Business purpose loans | Multifamily transitional loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net gain/(loss) on residential whole loans measured at fair value through earnings	(15,384)	2,550	(42,457)	4,624
Residential whole loan | Business purpose loans | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net gain/(loss) on residential whole loans measured at fair value through earnings	39,662	(38,914)	57,269	(40,805)
Residential whole loan | Non-QM loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net gain/(loss) on residential whole loans measured at fair value through earnings	94,489	(78,560)	124,058	(76,832)
Residential whole loan | Legacy RPL/NPL loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net gain/(loss) on residential whole loans measured at fair value through earnings	18,923	(15,426)	9,002	(19,928)
Residential whole loan | Other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net gain/(loss) on residential whole loans measured at fair value through earnings	$ 3,325	$ (3,232)	$ 2,181	$ (2,567)

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Mortgage Loans On Real Estate, Gain (Loss) On Loans Measured At Fair Value

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481628/310-20-40-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

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