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Investments Securities - Schedule of Investments in Debt Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 486,999 | $ 203,418
Accrued Interest | $ 448 | 631
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Fair Value |
Gross Unrealized Gains | $ 3,440 | 0
Gross Unrealized Losses | (4,796) | (8,611)
Fair Value | $ 486,091 | $ 195,438
Percentage of high credit quality on amortized cost basis of investments | 89.00% | 67.00%
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 419,380 | $ 121,282
Accrued Interest | 187 | 217
Gross Unrealized Gains | 3,440 | 0
Gross Unrealized Losses | (1,230) | (3,510)
Fair Value | 421,777 | 117,989
Multinational securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 15,606 | 19,658
Accrued Interest | 55 | 109
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (147) | (724)
Fair Value | 15,514 | 19,043
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 34,751 | 41,890
Accrued Interest | 175 | 257
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1,701) | (2,644)
Fair Value | 33,225 | 39,503
Agency mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 8,059 | 8,899
Accrued Interest | 19 | 22
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1,228) | (991)
Fair Value | 6,850 | 7,930
Other asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 8,263 | 9,556
Accrued Interest | 5 | 5
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (267) | (514)
Fair Value | 8,001 | 9,047
Other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 940 | 2,133
Accrued Interest | 7 | 21
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (223) | (228)
Fair Value | $ 724 | $ 1,926

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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 (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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