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Residential Whole Loans (LTV on Loans) (Details) - 90 Days or More Delinquent $ in Thousands | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
--- | --- | ---
Carrying Value |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value / Fair Value | $ 355,096 | $ 432,774
UPB | 375,946 | 455,112
Fair Value |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value / Fair Value | 494,901 | 571,729
UPB | 496,694 | 625,621
Fair Value | Nonperforming |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value / Fair Value | 484,510 | 571,729
UPB | $ 485,998 | $ 625,621
LTV (as a percent) | 0.812 | 0.868
Fair Value | Performing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value / Fair Value | $ 10,391 | $ 0
UPB | $ 10,696 | $ 0
LTV (as a percent) | 0.627 | 0
Purchased credit deteriorated loans | Carrying Value |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value / Fair Value | $ 100,905 | $ 119,621
UPB | $ 123,189 | $ 145,028
LTV (as a percent) | 0.798 | 0.867
Non-QM loans | Carrying Value |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value / Fair Value | $ 121,741 | $ 148,387
UPB | $ 119,572 | $ 144,681
LTV (as a percent) | 0.645 | 0.659
Rehabilitation loans | Carrying Value |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value / Fair Value | $ 101,012 | $ 136,347
UPB | $ 101,012 | $ 136,347
LTV (as a percent) | 0.686 | 0.658
Single-family rental loans | Carrying Value |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value / Fair Value | $ 22,767 | $ 20,388
UPB | $ 22,771 | $ 20,233
LTV (as a percent) | 0.736 | 0.727
Seasoned performing loans | Carrying Value |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value / Fair Value | $ 8,671 | $ 8,031
UPB | $ 9,402 | $ 8,823
LTV (as a percent) | 0.513 | 0.551

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