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Residential Whole Loans (Fair Value) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Residential whole loans, at fair value | $ 1,381,583 | $ 1,471,262
Excluded amount, unsettled purchases, residential whole loans, at fair value |  | 194,700
Less than 60 Days Past Due: |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding principal balance | 666,026 | 610,290
Aggregate fair value | $ 641,616 | $ 561,770
Weighted average LTV ratio | 76.69% | 76.18%
Number of loans | loan | 3,159 | 2,898
60 Days to 89 Days Past Due: |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding principal balance | $ 58,160 | $ 63,938
Aggregate fair value | $ 53,485 | $ 54,947
Weighted average LTV ratio | 79.48% | 82.86%
Number of loans | loan | 313 | 285
90 Days or More Past Due: |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding principal balance | $ 767,320 | $ 970,758
Aggregate fair value | $ 686,482 | $ 854,545
Weighted average LTV ratio | 89.69% | 90.24%
Number of loans | loan | 2,983 | 3,531
Residential whole loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Excluded amount, unsettled purchases, residential whole loans, at fair value |  | $ 194,700

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- Definition The LTV of which the Company has assessed its residential whole loans at carrying value will have a higher likelihood of default than newly originated mortgage loans + References No definition available. + Details
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- Definition Number of mortgage loans within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Footnote 3 -Subsection 29 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Footnote 3)) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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