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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 | 6 Months Ended
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Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total other comprehensive income (loss) | $ (1,697) | $ 39,843 | $ (43,580) | $ 105,307
Income tax benefit (expense) | 356 | (8,367) | 9,151 | (22,114)
Other comprehensive income (loss), net of tax | (1,341) | 31,476 | (34,429) | 83,193
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other comprehensive income (loss), net of tax | (1,341) | 31,476 | (34,429) | 83,193
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) | (1,887) | 36,105 | (43,960) | 101,511
Income tax benefit (expense) | 396 | (7,582) | 9,231 | (21,317)
Other comprehensive income (loss), net of tax | (1,491) | 28,523 | (34,729) | 80,194
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 | 3,738 | 380 | 3,796
Income tax benefit (expense) | (40) | (785) | (80) | (797)
Other comprehensive income (loss), net of tax | $ 150 | $ 2,953 | $ 300 | $ 2,999

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