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Residential Whole Loans - LTV on Loans (Details) - Financial Asset, Equal to or Greater than 60 Days Past Due $ in Thousands | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
--- | --- | ---
Carrying Value |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value / Fair Value | $ 333,861 | $ 284,391
UPB | 359,614 | 307,732
Carrying Value | Non-QM loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value / Fair Value | 126,310 | 102,252
UPB | $ 129,974 | $ 104,454
LTV (as a percent) | 0.652 | 0.639
Carrying Value | Transitional loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value / Fair Value | $ 142,423 | $ 113,772
UPB | $ 150,938 | $ 119,936
LTV (as a percent) | 0.659 | 0.651
Carrying Value | Single-family Rental Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value / Fair Value | $ 63,173 | $ 65,659
UPB | $ 76,621 | $ 80,570
LTV (as a percent) | 1.110 | 1.091
Carrying Value | Seasoned performing loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value / Fair Value | $ 1,373 | $ 2,520
UPB | $ 1,371 | $ 2,544
LTV (as a percent) | 0.246 | 0.336
Carrying Value | Agency eligible investor loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value / Fair Value | $ 582 | $ 188
UPB | $ 710 | $ 228
LTV (as a percent) | 0.717 | 0.734
Fair Value |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value / Fair Value | $ 609,730 | $ 572,799
UPB | 664,367 | 621,641
Fair Value | Nonperforming |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value / Fair Value | 212,437 | 222,319
UPB | $ 225,305 | $ 231,782
LTV (as a percent) | 0.696 | 0.707
Fair Value | Purchased Credit Deteriorated Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value / Fair Value | $ 63,432 | $ 66,089
UPB | $ 79,448 | $ 82,127
LTV (as a percent) | 0.643 | 0.643

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