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Securities, at Fair Value - Impairment and Other Net Gain/(Loss) on Securities and Other Portfolio Investments (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Investments, Debt and Equity Securities [Abstract] |  |
Net unrealized gain/(loss) on securities | $ (4,112) | $ 2,931
Net realized gain/(loss) from the sale of securities | 0 | 0
Impairment of securities | 0 | 0
Total Impairment and other net gain/(loss) on securities | (4,112) | 2,931
Net unrealized gain/(loss) on other portfolio investments | (664) | 0
Net realized gain/(loss) on other portfolio investments | 0 | 0
Total Impairment and other net gain/(loss) on securities and other portfolio investments | $ (4,776) | $ 2,931

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- Definition Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)(d)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479536/321-10-50-4 + Details
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