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Residential Whole Loans (Residential Whole Loans, at Carrying Value - Additional Information) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average LTV Ratio | 80.00% |
Settled Whole Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Residential whole loans, total or weighted average | $ 5,226,424 | $ 3,478,160
Unpaid Principal Balance (“UPB”) | $ 5,107,108 | $ 3,467,099
Weighted Average Coupon | 5.21% | 6.04%
Weighted Average Term to Maturity (Months) | 304 months | 281 months
Settled Whole Loans | Non-QM loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchased performing loans | $ 2,825,883 | $ 2,336,117
Unpaid Principal Balance (“UPB”) | $ 2,737,998 | $ 2,294,086
Weighted Average Coupon | 5.36% | 5.84%
Weighted Average Term to Maturity (Months) | 350 months | 351 months
Weighted Average LTV Ratio | 64.00% | 64.00%
Weighted Average FICO Scores | 725 | 712
Settled Whole Loans | Rehabilitation loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchased performing loans | $ 587,539 | $ 563,430
Unpaid Principal Balance (“UPB”) | $ 594,366 | $ 581,801
Weighted Average Coupon | 7.27% | 7.29%
Weighted Average Term to Maturity (Months) | 8 months | 3 months
Weighted Average LTV Ratio | 66.00% | 63.00%
Weighted Average FICO Scores | 726 | 719
Settled Whole Loans | Single-family rental loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchased performing loans | $ 739,428 | $ 442,456
Unpaid Principal Balance (“UPB”) | $ 717,552 | $ 442,208
Weighted Average Coupon | 5.69% | 6.32%
Weighted Average Term to Maturity (Months) | 330 months | 324 months
Weighted Average LTV Ratio | 70.00% | 70.00%
Weighted Average FICO Scores | 731 | 730
Settled Whole Loans | Seasoned performing loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchased performing loans | $ 110,112 | $ 136,157
Unpaid Principal Balance (“UPB”) | $ 120,444 | $ 149,004
Weighted Average Coupon | 2.86% | 3.30%
Weighted Average Term to Maturity (Months) | 164 months | 171 months
Weighted Average LTV Ratio | 38.00% | 40.00%
Weighted Average FICO Scores | 722 | 723
Settled Whole Loans | Agency eligible investor loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchased performing loans | $ 963,462 |
Unpaid Principal Balance (“UPB”) | $ 936,748 |
Weighted Average Coupon | 3.40% |
Weighted Average Term to Maturity (Months) | 356 months |
Weighted Average LTV Ratio | 62.00% |
Weighted Average FICO Scores | 767 |
Settled Whole Loans | Purchased Credit Deteriorated Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Residential whole loans, at carrying value | $ 551,186 | $ 630,339
Unpaid Principal Balance (“UPB”) | $ 674,367 | $ 782,319
Weighted Average Coupon | 4.55% | 4.46%
Weighted Average Term to Maturity (Months) | 284 months | 287 months
Weighted Average LTV Ratio | 69.00% | 76.00%
Settled Whole Loans | Purchased Non-Performing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Residential whole loans, at carrying value | $ 1,140,837 | $ 1,216,902
Unpaid Principal Balance (“UPB”) | $ 1,137,666 | $ 1,282,093
Weighted Average Coupon | 4.88% | 4.87%
Weighted Average Term to Maturity (Months) | 285 months | 290 months
Weighted Average LTV Ratio | 74.00% | 80.00%
Settled Whole Loans | Residential whole loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Residential whole loans, at carrying value | $ 6,918,447 | $ 5,325,401
Unpaid Principal Balance (“UPB”) | $ 6,919,141 | $ 5,531,511
Weighted Average Coupon | 5.10% | 5.54%
Weighted Average Term to Maturity (Months) | 299 months | 284 months
Settled Whole Loans | Current | Non-QM loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | $ 2,526,620 | $ 2,042,405
Settled Whole Loans | Current | Rehabilitation loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 469,292 | 390,706
Settled Whole Loans | Current | Single-family rental loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 690,822 | 411,377
Settled Whole Loans | Current | Seasoned performing loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 109,331 | 136,778
Settled Whole Loans | Current | Agency eligible investor loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 933,633 |
Settled Whole Loans | Current | Purchased Credit Deteriorated Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 481,330 | 544,803
Settled Whole Loans | Current | Purchased Non-Performing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 517,924 | 497,299
Settled Whole Loans | 30-59 | Non-QM loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 65,991 | 71,303
Settled Whole Loans | 30-59 | Rehabilitation loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 17,939 | 29,315
Settled Whole Loans | 30-59 | Single-family rental loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 1,834 | 6,691
Settled Whole Loans | 30-59 | Seasoned performing loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 1,095 | 2,248
Settled Whole Loans | 30-59 | Agency eligible investor loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 2,818 |
Settled Whole Loans | 30-59 | Purchased Credit Deteriorated Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 50,991 | 65,791
Settled Whole Loans | 30-59 | Purchased Non-Performing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 94,139 | 104,993
Settled Whole Loans | 60-89 | Non-QM loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 18,902 | 35,697
Settled Whole Loans | 60-89 | Rehabilitation loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 3,432 | 25,433
Settled Whole Loans | 60-89 | Single-family rental loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 1,033 | 3,907
Settled Whole Loans | 60-89 | Seasoned performing loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 616 | 1,155
Settled Whole Loans | 60-89 | Agency eligible investor loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 297 |
Settled Whole Loans | 60-89 | Purchased Credit Deteriorated Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 18,857 | 26,697
Settled Whole Loans | 60-89 | Purchased Non-Performing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 39,605 | 54,180
Settled Whole Loans | 90 or more | Non-QM loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 126,485 | 144,681
Settled Whole Loans | 90 or more | Rehabilitation loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 103,703 | 136,347
Settled Whole Loans | 90 or more | Single-family rental loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 23,863 | 20,233
Settled Whole Loans | 90 or more | Seasoned performing loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 9,402 | 8,823
Settled Whole Loans | 90 or more | Agency eligible investor loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 0 |
Settled Whole Loans | 90 or more | Purchased Credit Deteriorated Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 123,189 | 145,028
Settled Whole Loans | 90 or more | Purchased Non-Performing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | $ 485,998 | $ 625,621

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- Definition The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123409700&loc=d3e13503-111538 + Details
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