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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