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Investments - Carrying Value and Amortized Cost of Company's Investments Summarized by Major Security Type (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	$ 587,966	$ 436,036
Debt securities, Unrealized Gains	1,167	476
Debt securities, Unrealized Losses	(110)	(108)
Debt securities, Estimated Fair Value	589,023	436,404
US Treasury Securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	406,208	245,584
Debt securities, Unrealized Gains	1,024	319
Debt securities, Unrealized Losses	(25)	0
Debt securities, Estimated Fair Value	407,207	245,903
Government Sponsored Enterprises Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	181,758	190,452
Debt securities, Unrealized Gains	143	157
Debt securities, Unrealized Losses	(85)	(108)
Debt securities, Estimated Fair Value	$ 181,816	$ 190,501

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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

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-Topic 320
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-Section 50
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-Publisher FASB
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