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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

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