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Other Comprehensive Income (Loss) - Roll-Forward for AOCI (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, beginning of year $ 5,072,017 $ 4,642,740  
Balance, end of year 5,172,375 5,072,017 $ 4,642,740
Accumulated other comprehensive income (loss)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, beginning of year (316,281) (481,511) 119,697
Other comprehensive income (loss) before reclassifications 13,903 132,769 (622,230)
Less: Amounts reclassified from AOCI (14,216) (32,461) (21,022)
Balance, end of year (288,162) (316,281) (481,511)
Net unrealized gains and losses on available-for-sale securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, beginning of year (266,948) (408,496) 150,038
Other comprehensive income (loss) before reclassifications (2,835) 120,139 (566,324)
Less: Amounts reclassified from AOCI (11,905) (21,409) (7,790)
Balance, end of year (257,878) (266,948) (408,496)
Net benefit plan assets and obligations recognized in shareholders' equity      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, beginning of year (49,333) (73,015) (30,341)
Other comprehensive income (loss) before reclassifications 16,738 12,630 (55,906)
Less: Amounts reclassified from AOCI (2,311) (11,052) (13,232)
Balance, end of year $ (30,284) $ (49,333) $ (73,015)