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Residential Whole Loans - LTV on Loans (Details) - Residential whole loan $ in Thousands | Sep. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
UPB | $ 9,346,212 |
Business purpose loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
UPB | 3,766,387 | $ 4,098,044
Business purpose loans | Single-family transitional loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
UPB | 1,158,413 | 1,197,346
Business purpose loans | Multifamily transitional loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
UPB | 1,102,732 | 1,170,775
Business purpose loans | Single-family rental loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
UPB | 1,505,242 | 1,729,923
Non-QM loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
UPB | 4,264,091 | 3,934,798
Legacy RPL/NPL loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
UPB | 1,250,859 | 1,355,280
Other loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
UPB | 64,875 | 66,830
Financial Asset, Equal to or Greater than 60 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value / Fair Value | 561,201 | 572,799
UPB | 626,349 | 621,641
Financial Asset, Equal to or Greater than 60 Days Past Due | Business purpose loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value / Fair Value | 166,614 | 179,431
UPB | 208,342 | 200,506
Financial Asset, Equal to or Greater than 60 Days Past Due | Business purpose loans | Single-family transitional loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value / Fair Value | 89,616 | 93,960
UPB | $ 95,648 | $ 99,341
LTV (as a percent) | 0.84 | 0.66
Financial Asset, Equal to or Greater than 60 Days Past Due | Business purpose loans | Multifamily transitional loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value / Fair Value | $ 36,664 | $ 19,812
UPB | $ 60,732 | $ 20,595
LTV (as a percent) | 0.79 | 0.63
Financial Asset, Equal to or Greater than 60 Days Past Due | Business purpose loans | Single-family rental loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value / Fair Value | $ 40,334 | $ 65,659
UPB | $ 51,962 | $ 80,570
LTV (as a percent) | 1.03 | 1.09
Financial Asset, Equal to or Greater than 60 Days Past Due | Non-QM loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value / Fair Value | $ 145,875 | $ 102,252
UPB | $ 149,891 | $ 104,454
LTV (as a percent) | 0.65 | 0.64
Financial Asset, Equal to or Greater than 60 Days Past Due | Legacy RPL/NPL loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value / Fair Value | $ 248,712 | $ 290,928
UPB | $ 268,116 | $ 316,453
LTV (as a percent) | 0.63 | 0.69
Financial Asset, Equal to or Greater than 60 Days Past Due | 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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