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Residential Whole Loans (Residential Whole Loans, at Carrying Value) (Details) $ in Thousands | Sep. 30, 2020 USD ($) loan | Jan. 01, 2020 USD ($) | Dec. 31, 2019 USD ($) loan
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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
Total Residential whole loans, at carrying value | [1] | 4,493,805 |  | 6,069,370
Allowance for credit losses on residential whole loans held at carrying value |  | (106,246) |  | (3,025)
Total Residential whole loans at carrying value, net |  | $ 4,387,559 |  | $ 6,066,345
Number of loans | loan |  | 13,754 |  | 17,082
Non-QM Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Purchased Performing Loans |  | $ 2,465,148 |  | $ 3,707,245
Rehabilitation loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Purchased Performing Loans |  | 699,868 |  | 1,026,097
Single-family rental loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Purchased Performing Loans |  | 479,070 |  | 460,742
Seasoned performing loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Purchased Performing Loans |  | $ 147,706 |  | $ 176,569
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Purchased Credit Deteriorated Loans |  |  | $ 62,600 |
[1] | Includes approximately $568.6 million and $186.4 million of Residential whole loans, at carrying value and $521.2 million and $567.4 million of Residential whole loans, at fair value transferred to consolidated variable interest entities (“VIEs”) at September 30, 2020 and December 31, 2019, respectively. Such assets can be used only to settle the obligations of each respective VIE.

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- Definition Residential whole loans arising from the Company’s 100% equity interest in certificates issued by certain trusts established to acquire the loans. + References No definition available. + Details
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- Definition Residential Whole Loans, Carrying Value + References No definition available. + Details
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- Definition The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121581245&loc=d3e21338-158488 + Details
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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=121585399&loc=d3e13503-111538 + Details
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