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Real Estate Securities - Available for Sale Securities by Collateral Type (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Investment Holdings [Line Items] |  |
Available-for-sale | $ 207,173 | $ 239,334
Senior IO Securities |  |
Investment Holdings [Line Items] |  |
Available-for-sale | 0 | 25,792
Mezzanine |  |
Investment Holdings [Line Items] |  |
Available-for-sale | 2,016 | 13,687
Senior IO Securities |  |
Investment Holdings [Line Items] |  |
Available-for-sale | 0 | 25,792
Subordinate Securities | Mezzanine |  |
Investment Holdings [Line Items] |  |
Available-for-sale | 2,016 | 13,687
Subordinate Securities | Subordinate |  |
Investment Holdings [Line Items] |  |
Available-for-sale | $ 205,157 | $ 199,855

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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