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Investments - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Available-for-sale debt securities:
Due in one year or less, amortized cost	$ 42,421
Due in one year or less, fair value	41,868
Due after one year through five years, amortized cost	117,691
Due after one year through five years, fair value	113,554
Due after five years through ten years, amortized cost	98,279
Due after five years through ten years, fair value	92,846
Due after ten years, amortized cost	213,854
Due after ten years, fair value	203,089
Amortized cost	472,245	$ 459,537
Fair value	$ 451,357	$ 425,912

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