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Residential Whole Loans (Residential Whole Loans, at Carrying Value - Additional Information) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchased performing loans | $ 3,521,624 | $ 5,370,653
Purchased Credit Deteriorated Loans | 673,708 | 698,717
Total | 4,195,332 |
Non-QM Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchased performing loans | 2,357,185 | 3,707,245
Total | 2,357,185 |
Rehabilitation loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchased performing loans | 581,801 | 1,026,097
Total | 581,801 |
Single-family rental loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchased performing loans | 446,374 | 460,742
Total | 446,374 |
Seasoned performing loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchased performing loans | 136,264 | $ 176,569
Total | $ 136,264 |
90 or more |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average LTV Ratio | 86.78% | 89.69%
90 or more | Non-QM Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | $ 144,681 |
90 or more | Rehabilitation loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | 136,347 |
90 or more | Single-family rental loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | 20,233 |
90 or more | Seasoned performing loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | 8,823 |
Settled Whole Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 4,108,499 | $ 6,066,345
Amortized Cost Basis | 4,195,332 | 6,069,370
Unpaid Principal Balance (“UPB”) | $ 4,249,418 | $ 6,141,421
Weighted Average Coupon | 5.77% | 5.96%
Weighted Average Term to Maturity (Months) | 282 months | 288 months
Settled Whole Loans | Non-QM Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchased performing loans | $ 2,336,117 | $ 3,706,857
Amortized Cost Basis | 2,357,185 | 3,707,245
Unpaid Principal Balance (“UPB”) | $ 2,294,086 | $ 3,592,701
Weighted Average Coupon | 5.84% | 5.96%
Weighted Average Term to Maturity (Months) | 351 months | 368 months
Weighted Average LTV Ratio | 64.00% | 67.00%
Weighted Average FICO Scores | 712 | 716
Settled Whole Loans | Rehabilitation loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchased performing loans | $ 563,430 | $ 1,023,766
Amortized Cost Basis | 581,801 | 1,026,097
Unpaid Principal Balance (“UPB”) | $ 581,801 | $ 1,026,097
Weighted Average Coupon | 7.29% | 7.30%
Weighted Average Term to Maturity (Months) | 3 months | 8 months
Weighted Average LTV Ratio | 63.00% | 64.00%
Weighted Average FICO Scores | 719 | 717
Settled Whole Loans | Single-family rental loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchased performing loans | $ 442,456 | $ 460,679
Amortized Cost Basis | 446,374 | 460,741
Unpaid Principal Balance (“UPB”) | $ 442,208 | $ 457,146
Weighted Average Coupon | 6.32% | 6.29%
Weighted Average Term to Maturity (Months) | 324 months | 324 months
Weighted Average LTV Ratio | 70.00% | 70.00%
Weighted Average FICO Scores | 730 | 734
Settled Whole Loans | Seasoned performing loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchased performing loans | $ 136,157 | $ 176,569
Amortized Cost Basis | 136,264 | 176,569
Unpaid Principal Balance (“UPB”) | $ 149,004 | $ 192,151
Weighted Average Coupon | 3.30% | 4.24%
Weighted Average Term to Maturity (Months) | 171 months | 181 months
Weighted Average LTV Ratio | 40.00% | 46.00%
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 | $ 630,339 | $ 698,474
Amortized Cost Basis | 673,708 | 698,718
Unpaid Principal Balance (“UPB”) | $ 782,319 | $ 873,326
Weighted Average Coupon | 4.46% | 4.46%
Weighted Average Term to Maturity (Months) | 287 months | 294 months
Weighted Average LTV Ratio | 76.00% | 81.00%
Settled Whole Loans | Certain rehabilitation loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchased performing loans | $ 189,900 | $ 269,200
Weighted Average LTV Ratio | 68.00% | 69.00%
Settled Whole Loans | Current | Non-QM Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | $ 2,099,134 | $ 3,492,533
Settled Whole Loans | Current | Rehabilitation loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | 390,706 | 868,281
Settled Whole Loans | Current | Single-family rental loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | 415,386 | 432,936
Settled Whole Loans | Current | Seasoned performing loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | 124,877 | 187,683
Settled Whole Loans | 30-59 | Non-QM Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | 73,163 | 59,963
Settled Whole Loans | 30-59 | Rehabilitation loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | 29,315 | 67,747
Settled Whole Loans | 30-59 | Single-family rental loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | 6,652 | 15,948
Settled Whole Loans | 30-59 | Seasoned performing loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | 2,186 | 2,164
Settled Whole Loans | 60-89 | Non-QM Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | 36,501 | 19,605
Settled Whole Loans | 60-89 | Rehabilitation loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | 25,433 | 27,437
Settled Whole Loans | 60-89 | Single-family rental loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | 3,948 | 2,047
Settled Whole Loans | 60-89 | Seasoned performing loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | 1,170 | 430
Settled Whole Loans | 90 or more | Non-QM Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | 148,387 | 20,600
Settled Whole Loans | 90 or more | Rehabilitation loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | 136,347 | 62,632
Settled Whole Loans | 90 or more | Single-family rental loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | 20,388 | 6,215
Settled Whole Loans | 90 or more | Seasoned performing loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | 8,031 | 1,874
Settled Whole Loans | 90 or more | Purchased credit impaired loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | $ 119,621 | $ 108,998

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