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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
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