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Investments Securities - Schedule of Investments in Debt Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 839,936 $ 596,757
Accrued Interest $ 1,476 639
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Fair Value  
Gross Unrealized Gains $ 307 1,011
Gross Unrealized Losses (3,213) (3,220)
Fair Value $ 838,506 $ 595,187
Percentage of high credit quality on amortized cost basis of investments 97.00% 92.00%
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 465,759 $ 518,673
Accrued Interest 279 206
Gross Unrealized Gains 37 978
Gross Unrealized Losses (584) (780)
Fair Value 465,491 519,077
Multinational securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost   8,548
Accrued Interest   103
Gross Unrealized Gains   0
Gross Unrealized Losses   (17)
Fair Value   8,634
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 23,692 32,609
Accrued Interest 153 207
Gross Unrealized Gains 1 0
Gross Unrealized Losses (911) (1,092)
Fair Value 22,935 31,724
Agency mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 345,451 28,714
Accrued Interest 1,039 111
Gross Unrealized Gains 269 33
Gross Unrealized Losses (1,455) (1,016)
Fair Value 345,304 27,842
Other asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 4,092 7,272
Accrued Interest 1 4
Gross Unrealized Gains 0 0
Gross Unrealized Losses (92) (154)
Fair Value 4,001 7,122
Other    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 942 941
Accrued Interest 4 8
Gross Unrealized Gains 0 0
Gross Unrealized Losses (171) (161)
Fair Value $ 775 $ 788