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Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total other comprehensive income (loss) $ (27,389) $ 28,310 $ (87,565) $ 120,341
Income tax benefit (expense) 5,752 (5,945) 18,389 (25,272)
Other comprehensive income (loss), net of tax (21,637) 22,365 (69,176) 95,069
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract]        
Income tax benefit (expense) (41,755) (33,518) (122,168) (74,388)
Total reclassifications, net of tax 157,977 130,811 461,049 294,663
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period     4,698,986  
Other comprehensive income before reclassifications     (65,583)  
Less: Amounts reclassified from AOCI     3,593  
Balance, end of period 4,877,420 4,513,622 4,877,420 4,513,622
Reclassification from Accumulated Other Comprehensive Income        
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract]        
Total reclassifications before tax 74 9,013 4,547 4,668
Income tax benefit (expense) (15) (1,893) (954) (980)
Total reclassifications, net of tax 59 7,120 3,593 3,688
Accumulated other comprehensive income (loss)        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other comprehensive income (loss), net of tax (21,637) 22,365 (69,176) 95,069
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period 169,282 145,412 216,821 72,708
Balance, end of period 147,645 167,777 147,645 167,777
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) (34,937) 42,674 (97,057) 132,036
Income tax benefit (expense) 7,337 (8,962) 20,382 (27,728)
Other comprehensive income (loss), net of tax (27,600) 33,712 (76,675) 104,308
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period     272,137  
Other comprehensive income before reclassifications     (70,779)  
Less: Amounts reclassified from AOCI     5,896  
Balance, end of period 195,462   195,462  
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 1,045 10,349 7,462 8,673
Income tax benefit (expense) (219) (2,173) (1,566) (1,821)
Total reclassifications, net of tax 826 8,176 5,896 6,852
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) 7,548 (14,364) 9,492 (11,695)
Income tax benefit (expense) (1,585) 3,017 (1,993) 2,456
Other comprehensive income (loss), net of tax 5,963 (11,347) 7,499 (9,239)
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period     (55,316)  
Other comprehensive income before reclassifications     5,196  
Less: Amounts reclassified from AOCI     (2,303)  
Balance, end of period (47,817)   (47,817)  
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 (971) (1,336) (2,915) (4,005)
Income tax benefit (expense) 204 280 612 841
Total reclassifications, net of tax $ (767) $ (1,056) $ (2,303) $ (3,164)