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Other Comprehensive Income - Pretax and Related Income Tax Benefit (Expense) Components of the Amounts Reclassified from Accumulated 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 reclassifications $ 206,828 $ 234,681
Income tax benefit (expense) (41,525) (49,221)
Net Income 165,303 185,460
Reclassification from Accumulated Other Comprehensive Income    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total reclassifications (288) (6,039)
Income tax benefit (expense) 61 1,268
Net Income (227) (4,771)
Reclassification from Accumulated Other Comprehensive Income | Net unrealized gains and (losses) on available-for-sale securities    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total reclassifications (98) (5,981)
Income tax benefit (expense) 21 1,256
Net Income (77) (4,725)
Reclassification from Accumulated Other Comprehensive Income | Net benefit plan assets and (obligations) recognized in shareholders' equity    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total reclassifications (190) (58)
Income tax benefit (expense) 40 12
Net Income $ (150) $ (46)