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Other Comprehensive Income - Rollforward of AOCI (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Balance, beginning of period $ 5,072,017
Other comprehensive income (loss) before reclassifications (27,358)
Less: Amounts reclassified from AOCI (10,584)
Balance, end of period 5,116,921
Accumulated other comprehensive income (loss)  
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Balance, beginning of period (316,281)
Balance, end of period (333,055)
Net unrealized gains and (losses) on available-for-sale securities  
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Balance, beginning of period (266,948)
Other comprehensive income (loss) before reclassifications (27,358)
Less: Amounts reclassified from AOCI (9,507)
Balance, end of period (284,799)
Net benefit plan assets and (obligations) recognized in shareholders' equity  
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Balance, beginning of period (49,333)
Other comprehensive income (loss) before reclassifications 0
Less: Amounts reclassified from AOCI (1,077)
Balance, end of period $ (48,256)