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Residential Whole Loans - LTV on Loans (Details) - Financial Asset, Equal to or Greater than 60 Days Past Due - Residential whole loan $ in Thousands	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	$ 565,319	$ 572,799
UPB	624,463	621,641
Business purpose loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	192,531	179,431
UPB	222,632	200,506
Business purpose loans | Single-family transitional loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	97,537	93,960
UPB	$ 105,766	$ 99,341
LTV (as a percent)	0.87	0.66
Business purpose loans | Multifamily transitional loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	$ 46,377	$ 19,812
UPB	$ 54,102	$ 20,595
LTV (as a percent)	0.69	0.63
Business purpose loans | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	$ 48,617	$ 65,659
UPB	$ 62,764	$ 80,570
LTV (as a percent)	1.12	1.09
Non-QM loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	$ 122,663	$ 102,252
UPB	$ 125,918	$ 104,454
LTV (as a percent)	0.62	0.64
Legacy RPL/NPL loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	$ 250,125	$ 290,928
UPB	$ 275,913	$ 316,453
LTV (as a percent)	0.64	0.69
Other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	$ 0	$ 188
UPB	$ 0	$ 228
LTV (as a percent)	0	0.73

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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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