Fair Value Measurement - Gains (Losses) on Securities (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Fair Value Disclosures [Abstract] | ||||
| Change in unrealized investment gains during the year on securities held at the end of the period | $ 0 | $ 495 | $ 0 | $ 224 |
| Investment gains during the period on securities sold | 0 | 2,975 | 0 | 863 |
| Net gains recognized on equity securities | $ 0 | $ 3,470 | $ 0 | $ 1,087 |