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Residential Whole Loans (Residential Whole Loans, at Carrying Value - Additional Information) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchased performing loans | $ 5,367,871 | $ 2,218,728
Purchased credit impaired loans | 698,474 | 797,987
Non-QM loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchased performing loans | 3,706,857 | 1,354,774
Allowance for losses | 388 |
Rehabilitation loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchased performing loans | 1,023,766 | 494,576
Single-family rental loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchased performing loans | 460,679 | 145,327
Allowance for losses | 62 |
Seasoned performing loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchased performing loans | 176,569 | $ 224,051
Certain rehabilitation loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Allowance for losses | $ 2,300 |
90 or more |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted average LTV ratio | 89.69% | 90.24%
Settled Whole Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Residential whole loans, at carrying value, total or weighted average | $ 6,069,126 |
Unpaid Principal Balance (“UPB”) | $ 6,141,421 |
Weighted Average Coupon | 5.96% |
Weighted average contractual maturity | 288 months |
Settled Whole Loans | Non-QM loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchased performing loans | $ 3,707,245 |
Unpaid Principal Balance (“UPB”) | $ 3,592,701 |
Weighted Average Coupon | 5.96% |
Weighted average contractual maturity | 368 months |
Weighted average LTV ratio | 67.00% |
Weighted Average FICO Scores | 716 |
Settled Whole Loans | Rehabilitation loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchased performing loans | $ 1,026,097 |
Unpaid Principal Balance (“UPB”) | $ 1,026,097 |
Weighted Average Coupon | 7.30% |
Weighted average contractual maturity | 8 months |
Weighted average LTV ratio | 64.00% |
Weighted Average FICO Scores | 717 |
Settled Whole Loans | Single-family rental loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchased performing loans | $ 460,741 |
Unpaid Principal Balance (“UPB”) | $ 457,146 |
Weighted Average Coupon | 6.29% |
Weighted average contractual maturity | 324 months |
Weighted average LTV ratio | 70.00% |
Weighted Average FICO Scores | 734 |
Settled Whole Loans | Seasoned performing loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchased performing loans | $ 176,569 |
Unpaid Principal Balance (“UPB”) | $ 192,151 |
Weighted Average Coupon | 4.24% |
Weighted average contractual maturity | 181 months |
Weighted average LTV ratio | 46.00% |
Weighted Average FICO Scores | 723 |
Settled Whole Loans | Purchased credit impaired loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchased credit impaired loans | $ 698,474 |
Unpaid Principal Balance (“UPB”) | $ 873,326 |
Weighted Average Coupon | 4.46% |
Weighted average contractual maturity | 294 months |
Weighted average LTV ratio | 81.00% |
Settled Whole Loans | Certain rehabilitation loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchased performing loans | $ 269,200 |
Weighted average LTV ratio | 69.00% |
Settled Whole Loans | Current | Non-QM loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | $ 3,492,533 |
Settled Whole Loans | Current | Rehabilitation loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | 868,281 |
Settled Whole Loans | Current | Single-family rental loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | 432,936 |
Settled Whole Loans | Current | Seasoned performing loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | 187,683 |
Settled Whole Loans | 30-59 | Non-QM loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | 59,963 |
Settled Whole Loans | 30-59 | Rehabilitation loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | 67,747 |
Settled Whole Loans | 30-59 | Single-family rental loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | 15,948 |
Settled Whole Loans | 30-59 | Seasoned performing loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | 2,164 |
Settled Whole Loans | 60-89 | Non-QM loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | 19,605 |
Settled Whole Loans | 60-89 | Rehabilitation loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | 27,437 |
Settled Whole Loans | 60-89 | Single-family rental loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | 2,047 |
Settled Whole Loans | 60-89 | Seasoned performing loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | 430 |
Settled Whole Loans | 90 or more | Non-QM loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | 20,600 |
Settled Whole Loans | 90 or more | Rehabilitation loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | 62,632 |
Settled Whole Loans | 90 or more | Single-family rental loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | 6,215 |
Settled Whole Loans | 90 or more | Seasoned performing loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | 1,874 |
Settled Whole Loans | 90 or more | Purchased credit impaired loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance (“UPB”) | $ 108,998 |

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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=118939070&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=118938799&loc=d3e13503-111538 + Details
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