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Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total other comprehensive income (loss) $ 163,283 $ (91,149) $ 142,050 $ (19,473)
Income tax benefit (expense) (34,289) 19,141 (29,830) 4,089
Other comprehensive income (loss), net of tax 128,994 (72,008) 112,220 (15,384)
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract]        
Total reclassifications before tax 254,296 234,396 734,001 672,382
Income tax benefit (expense) (54,327) (51,552) (155,707) (143,937)
Total reclassifications, net of tax 199,969 182,844 578,294 528,445
Reclassification from Accumulated Other Comprehensive Income        
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract]        
Total reclassifications before tax (3,050) (5,461) (16,447) (25,399)
Income tax benefit (expense) 640 1,147 3,453 5,334
Total reclassifications, net of tax (2,410) (4,314) (12,994) (20,065)
Accumulated other comprehensive income (loss)        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other comprehensive income (loss), net of tax 128,994 (72,008) 112,220 (15,384)
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) 162,601 (95,216) 140,005 (31,387)
Income tax benefit (expense) (34,146) 19,995 (29,401) 6,591
Other comprehensive income (loss), net of tax 128,455 (75,221) 110,604 (24,796)
Net unrealized gains and (losses) on available-for-sale securities | Reclassification from Accumulated Other Comprehensive Income        
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract]        
Total reclassifications before tax (2,368) (3,085) (14,402) (13,020)
Income tax benefit (expense) 497 648 3,024 2,734
Total reclassifications, net of tax (1,871) (2,437) (11,378) (10,286)
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) 682 4,067 2,045 11,914
Income tax benefit (expense) (143) (854) (429) (2,502)
Other comprehensive income (loss), net of tax 539 3,213 1,616 9,412
Net benefit plan assets and (obligations) recognized in shareholders' equity | Reclassification from Accumulated Other Comprehensive Income        
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract]        
Total reclassifications before tax (682) (2,376) (2,045) (12,379)
Income tax benefit (expense) 143 499 429 2,600
Total reclassifications, net of tax $ (539) $ (1,877) $ (1,616) $ (9,779)