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Residential Whole Loans (Residential Whole Loans, at Carrying Value - Additional Information) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Purchased Performing Loans |  | $ 3,791,792 |  | $ 5,370,653
Purchased Credit Deteriorated Loans |  | 702,013 |  | 698,717
Residential whole loans, at carrying value, total or weighted average |  | $ 4,493,806 |  |
Weighted Average LTV Ratio |  | 80.00% |  |
Non-QM Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Purchased Performing Loans |  | $ 2,465,148 |  | 3,707,245
Residential whole loans, at carrying value, total or weighted average |  | 2,465,148 |  |
Rehabilitation loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Purchased Performing Loans |  | 699,868 |  | 1,026,097
Residential whole loans, at carrying value, total or weighted average |  | 699,868 |  |
Single-family rental loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Purchased Performing Loans |  | 479,070 |  | 460,742
Residential whole loans, at carrying value, total or weighted average |  | 479,070 |  |
Seasoned performing loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Purchased Performing Loans |  | 147,706 |  | 176,569
Residential whole loans, at carrying value, total or weighted average |  | $ 147,706 |  |
90 or more |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Weighted Average LTV Ratio |  | 87.82% | 89.69% |
Settled Whole Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Residential whole loans, at carrying value, total or weighted average |  | $ 4,387,559 |  | 6,066,345
Amortized Cost Basis |  | 4,493,805 |  | 6,069,370
Unpaid Principal Balance (“UPB”) |  | $ 4,546,058 |  | $ 6,141,421
Weighted Average Coupon |  | 5.81% |  | 5.96%
Weighted Average Term to Maturity (Months) | 288 months | 277 months |  |
Settled Whole Loans | Non-QM Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Purchased Performing Loans |  | $ 2,438,395 |  | $ 3,706,857
Amortized Cost Basis |  | 2,465,148 |  | 3,707,245
Unpaid Principal Balance (“UPB”) |  | $ 2,397,247 |  | $ 3,592,701
Weighted Average Coupon |  | 5.87% |  | 5.96%
Weighted Average Term to Maturity (Months) | 368 months | 352 months |  |
Weighted Average LTV Ratio | 67.00% | 64.00% |  |
Weighted Average FICO Scores | 716 | 712 |  |
Settled Whole Loans | Rehabilitation loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Purchased Performing Loans |  | $ 677,235 |  | $ 1,023,766
Amortized Cost Basis |  | 699,868 |  | 1,026,097
Unpaid Principal Balance (“UPB”) |  | $ 699,868 |  | $ 1,026,097
Weighted Average Coupon |  | 7.28% |  | 7.30%
Weighted Average Term to Maturity (Months) | 8 months | 4 months |  |
Weighted Average LTV Ratio | 64.00% | 63.00% |  |
Weighted Average FICO Scores | 717 | 718 |  |
Settled Whole Loans | Single-family rental loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Purchased Performing Loans |  | $ 474,045 |  | $ 460,679
Amortized Cost Basis |  | 479,070 |  | 460,741
Unpaid Principal Balance (“UPB”) |  | $ 475,072 |  | $ 457,146
Weighted Average Coupon |  | 6.28% |  | 6.29%
Weighted Average Term to Maturity (Months) | 324 months | 319 months |  |
Weighted Average LTV Ratio | 70.00% | 70.00% |  |
Weighted Average FICO Scores | 734 | 734 |  |
Settled Whole Loans | Seasoned performing loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Purchased Performing Loans |  | $ 147,556 |  | $ 176,569
Amortized Cost Basis |  | 147,706 |  | 176,569
Unpaid Principal Balance (“UPB”) |  | $ 161,257 |  | $ 192,151
Weighted Average Coupon |  | 3.45% |  | 4.24%
Weighted Average Term to Maturity (Months) | 181 months | 173 months |  |
Weighted Average LTV Ratio | 46.00% | 41.00% |  |
Weighted Average FICO Scores | 723 | 723 |  |
Settled Whole Loans | Purchased credit impaired loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Purchased Credit Deteriorated Loans |  | $ 650,328 |  | $ 698,474
Amortized Cost Basis |  | 702,013 |  | 698,718
Unpaid Principal Balance (“UPB”) |  | $ 812,614 |  | $ 873,326
Weighted Average Coupon |  | 4.45% |  | 4.46%
Weighted Average Term to Maturity (Months) | 294 months | 289 months |  |
Weighted Average LTV Ratio | 81.00% | 79.00% |  |
Settled Whole Loans | Certain Rehabilitation Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Purchased Performing Loans |  | $ 222,200 |  | $ 269,200
Weighted Average LTV Ratio | 69.00% | 68.00% |  |
Settled Whole Loans | Current | Non-QM Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortized Cost Basis |  | $ 2,174,935 |  | 3,492,533
Settled Whole Loans | Current | Rehabilitation loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortized Cost Basis |  | 491,343 |  | 868,281
Settled Whole Loans | Current | Single-family rental loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortized Cost Basis |  | 439,503 |  | 432,936
Settled Whole Loans | Current | Seasoned performing loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortized Cost Basis |  | 136,622 |  | 187,683
Settled Whole Loans | 30-59 | Non-QM Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortized Cost Basis |  | 74,231 |  | 59,963
Settled Whole Loans | 30-59 | Rehabilitation loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortized Cost Basis |  | 65,166 |  | 67,747
Settled Whole Loans | 30-59 | Single-family rental loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortized Cost Basis |  | 16,111 |  | 15,948
Settled Whole Loans | 30-59 | Seasoned performing loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortized Cost Basis |  | 1,406 |  | 2,164
Settled Whole Loans | 60-89 | Non-QM Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortized Cost Basis |  | 52,069 |  | 19,605
Settled Whole Loans | 60-89 | Rehabilitation loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortized Cost Basis |  | 22,995 |  | 27,437
Settled Whole Loans | 60-89 | Single-family rental loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortized Cost Basis |  | 7,373 |  | 2,047
Settled Whole Loans | 60-89 | Seasoned performing loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortized Cost Basis |  | 880 |  | 430
Settled Whole Loans | 90 or more | Non-QM Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortized Cost Basis |  | 163,913 |  | 20,600
Settled Whole Loans | 90 or more | Rehabilitation loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortized Cost Basis |  | 120,364 |  | 62,632
Settled Whole Loans | 90 or more | Single-family rental loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortized Cost Basis |  | 16,083 |  | 6,215
Settled Whole Loans | 90 or more | Seasoned performing loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortized Cost Basis |  | 8,798 |  | 1,874
Settled Whole Loans | 90 or more | Purchased credit impaired loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortized Cost Basis |  | $ 122,478 |  | $ 108,998

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