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Investments in debt and equity securities - Schedule of Debt Securities According to Contractual Terms (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Amortized costs |  |
In one year or less | $ 74,177 |
After one year through five years | 280,783 |
After five years through ten years | 186,074 |
After ten years | 13,741 |
Amortized costs | 554,775 | $ 558,544
Fair values |  |
In one year or less | 74,065 |
After one year through five years | 279,233 |
After five years through ten years | 185,330 |
After ten years | 12,533 |
Fair values | $ 551,161 | $ 558,488

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