v3.26.1
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
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