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Other Comprehensive Income - Pretax and Related Income Tax Benefit (Expense) Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2026 | Mar. 31, 2025
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Total other comprehensive income (loss) | $ (41,883) | $ 65,464
Income tax benefit (expense) | 8,795 | (13,747)
Other comprehensive income (loss), net of tax | (33,088) | 51,717
Accumulated Other Comprehensive Income (Loss) |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Other comprehensive income (loss), net of tax | (33,088) | 51,717
Net unrealized gains and (losses) on available-for-sale securities |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Total other comprehensive income (loss) | (42,073) | 65,406
Income tax benefit (expense) | 8,835 | (13,735)
Other comprehensive income (loss), net of tax | (33,238) | 51,671
Net benefit plan assets and (obligations) recognized in shareholders' equity |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Total other comprehensive income (loss) | 190 | 58
Income tax benefit (expense) | (40) | (12)
Other comprehensive income (loss), net of tax | $ 150 | $ 46

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