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Other Comprehensive Income - Rollforward of AOCI (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Balance, beginning of period $ 5,147,551
Other comprehensive income (loss) before reclassifications (33,315)
Less: Amounts reclassified from AOCI (227)
Balance, end of period 5,037,287
Accumulated Other Comprehensive Income (Loss)  
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Balance, beginning of period (134,394)
Balance, end of period (167,482)
Net unrealized gains and (losses) on available-for-sale securities  
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Balance, beginning of period (120,686)
Other comprehensive income (loss) before reclassifications (33,315)
Less: Amounts reclassified from AOCI (77)
Balance, end of period (153,924)
Net benefit plan assets and (obligations) recognized in shareholders' equity  
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Balance, beginning of period (13,708)
Other comprehensive income (loss) before reclassifications 0
Less: Amounts reclassified from AOCI (150)
Balance, end of period $ (13,558)