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Real Estate Securities - Schedule of Available for Sale Securities by Collateral Type (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Investment Holdings [Line Items] |  |  |
Subordinate securities, classified as AFS | $ 87,373 | $ 132,146 |
Fair value of securities acquired | 1,979 | 10,000 |
Fair value of securities sold | 55,842 | 0 |
Principal balance of securities called | 0 | 20,267 |
Net unrealized gain (loss) on available-for-sale securities | 6,230 | (64,704) | $ 8,016
Sequoia securities |  |  |
Investment Holdings [Line Items] |  |  |
Subordinate securities, classified as AFS | 78,942 | 74,367 |
Multifamily securities |  |  |
Investment Holdings [Line Items] |  |  |
Subordinate securities, classified as AFS | 4,460 | 7,647 |
Other third-party residential securities |  |  |
Investment Holdings [Line Items] |  |  |
Subordinate securities, classified as AFS | 3,971 | 50,132 |
Total Subordinate |  |  |
Investment Holdings [Line Items] |  |  |
Subordinate securities, classified as AFS | $ 87,373 | $ 132,146 |

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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 -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481830/320-10-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-1 + Details
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