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Residential Whole Loans - Residential Whole Loans, at Carrying Value Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average LTV Ratio | 80.00% |
Unsettled residential whole loans | $ 28,900 |
Settled Whole Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Purchased Performing Loans | 6,748,331 | $ 6,315,738
Unpaid Principal Balance (“UPB”) | $ 6,869,096 | $ 6,189,012
Weighted Average Coupon | 5.00% | 5.05%
Weighted Average Term to Maturity (Months) | 302 months | 307 months
Settled Whole Loans | Non-QM loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchased performing loans | $ 3,621,124 | $ 3,453,242
Unpaid Principal Balance (“UPB”) | $ 3,670,937 | $ 3,361,164
Weighted Average Coupon | 4.92% | 5.07%
Weighted Average Term to Maturity (Months) | 356 months | 355 months
Weighted Average LTV Ratio | 65.00% | 66.00%
Weighted Average FICO Scores | 733 | 731
Settled Whole Loans | Non-QM loans | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | $ 3,431,011 | $ 3,165,964
Settled Whole Loans | Non-QM loans | 30-59 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 119,445 | 77,581
Settled Whole Loans | Non-QM loans | 60-89 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 30,355 | 22,864
Settled Whole Loans | Non-QM loans | 90 or more |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 90,126 | 94,755
Settled Whole Loans | Rehabilitation loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchased performing loans | 885,155 | 727,964
Unpaid Principal Balance (“UPB”) | $ 886,942 | $ 731,154
Weighted Average Coupon | 7.11% | 7.18%
Weighted Average Term to Maturity (Months) | 12 months | 11 months
Weighted Average LTV Ratio | 67.00% | 67.00%
Weighted Average FICO Scores | 740 | 735
Settled Whole Loans | Rehabilitation loans | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | $ 783,366 | $ 616,733
Settled Whole Loans | Rehabilitation loans | 30-59 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 14,118 | 5,834
Settled Whole Loans | Rehabilitation loans | 60-89 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 3,178 | 5,553
Settled Whole Loans | Rehabilitation loans | 90 or more |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 86,280 | 103,034
Settled Whole Loans | Single-family rental loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchased performing loans | 1,152,195 | 949,772
Unpaid Principal Balance (“UPB”) | $ 1,168,778 | $ 924,498
Weighted Average Coupon | 5.26% | 5.46%
Weighted Average Term to Maturity (Months) | 324 months | 329 months
Weighted Average LTV Ratio | 70.00% | 70.00%
Weighted Average FICO Scores | 735 | 732
Settled Whole Loans | Single-family rental loans | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | $ 1,133,996 | $ 898,166
Settled Whole Loans | Single-family rental loans | 30-59 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 13,436 | 2,150
Settled Whole Loans | Single-family rental loans | 60-89 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 547 | 695
Settled Whole Loans | Single-family rental loans | 90 or more |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 20,799 | 23,487
Settled Whole Loans | Seasoned performing loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchased performing loans | 98,224 | 101,995
Unpaid Principal Balance (“UPB”) | $ 107,624 | $ 111,710
Weighted Average Coupon | 2.71% | 2.76%
Weighted Average Term to Maturity (Months) | 159 months | 162 months
Weighted Average LTV Ratio | 36.00% | 37.00%
Weighted Average FICO Scores | 722 | 722
Settled Whole Loans | Seasoned performing loans | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | $ 98,569 | $ 102,047
Settled Whole Loans | Seasoned performing loans | 30-59 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 634 | 938
Settled Whole Loans | Seasoned performing loans | 60-89 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 97 | 481
Settled Whole Loans | Seasoned performing loans | 90 or more |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 8,324 | 8,244
Settled Whole Loans | Agency eligible investor loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchased performing loans | 991,633 | 1,082,765
Unpaid Principal Balance (“UPB”) | $ 1,034,815 | $ 1,060,486
Weighted Average Coupon | 3.40% | 3.40%
Weighted Average Term to Maturity (Months) | 351 months | 354 months
Weighted Average LTV Ratio | 62.00% | 62.00%
Weighted Average FICO Scores | 767 | 767
Settled Whole Loans | Agency eligible investor loans | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | $ 1,026,214 | $ 1,039,257
Settled Whole Loans | Agency eligible investor loans | 30-59 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 7,595 | 21,229
Settled Whole Loans | Agency eligible investor loans | 60-89 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 814 | 0
Settled Whole Loans | Agency eligible investor loans | 90 or more |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 192 | 0
Settled Whole Loans | Purchased Credit Deteriorated Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchased Credit Deteriorated Loans | 496,871 | 524,992
Unpaid Principal Balance (“UPB”) | $ 610,651 | $ 643,187
Weighted Average Coupon | 4.57% | 4.55%
Weighted Average Term to Maturity (Months) | 280 months | 283 months
Weighted Average LTV Ratio | 69.00% | 69.00%
Settled Whole Loans | Purchased Credit Deteriorated Loans | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | $ 428,302 | $ 456,924
Settled Whole Loans | Purchased Credit Deteriorated Loans | 30-59 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 51,517 | 50,048
Settled Whole Loans | Purchased Credit Deteriorated Loans | 60-89 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 18,942 | 18,736
Settled Whole Loans | Purchased Credit Deteriorated Loans | 90 or more |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 111,890 | 117,479
Settled Whole Loans | Purchased Non-Performing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchased Credit Deteriorated Loans | 987,794 | 1,072,270
Unpaid Principal Balance (“UPB”) | $ 1,017,658 | $ 1,073,544
Weighted Average Coupon | 4.89% | 4.87%
Weighted Average Term to Maturity (Months) | 280 months | 283 months
Weighted Average LTV Ratio | 73.00% | 73.00%
Settled Whole Loans | Purchased Non-Performing Loans | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | $ 464,770 | $ 492,481
Settled Whole Loans | Purchased Non-Performing Loans | 30-59 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 85,856 | 87,041
Settled Whole Loans | Purchased Non-Performing Loans | 60-89 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 40,454 | 40,876
Settled Whole Loans | Purchased Non-Performing Loans | 90 or more |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aging by UPB | 426,578 | 453,146
Settled Whole Loans | Residential whole loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchased Credit Deteriorated Loans | 8,232,996 | 7,913,000
Unpaid Principal Balance (“UPB”) | $ 8,497,405 | $ 7,905,743
Weighted Average Coupon | 4.96% | 4.99%
Weighted Average Term to Maturity (Months) | 298 months | 301 months
Settled Whole Loans | Certain rehabilitation loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchased performing loans | $ 160,500 | $ 137,300
Weighted Average LTV Ratio | 74.00% | 71.00%

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