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Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total other comprehensive loss $ (118,045) $ (90,486)
Income tax (expense) benefit 24,789 19,002
Other comprehensive (loss) income, net of tax (93,256) (71,484)
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract]    
Income tax (expense) benefit (39,596) (38,434)
Total reclassifications, net of tax 150,021 149,805
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance, beginning of period 4,698,986  
Other comprehensive income before reclassifications (91,016)  
Less: Amounts reclassified from AOCI 2,240  
Balance, end of period 4,732,293 4,241,828
Reclassification from Accumulated Other Comprehensive Income    
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract]    
Total reclassifications before tax 2,835 3,320
Income tax (expense) benefit (595) (697)
Total reclassifications, net of tax 2,240 2,623
Accumulated other comprehensive income (loss)    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Other comprehensive (loss) income, net of tax (93,256) (71,484)
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance, beginning of period 216,821 72,708
Balance, end of period 123,565 1,224
Net unrealized gains and (losses) on available-for-sale securities    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total other comprehensive loss (119,150) (91,880)
Income tax (expense) benefit 25,021 19,295
Other comprehensive (loss) income, net of tax (94,129) (72,585)
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance, beginning of period 272,137  
Other comprehensive income before reclassifications (91,016)  
Less: Amounts reclassified from AOCI 3,113  
Balance, end of period 178,008  
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 3,940 4,714
Income tax (expense) benefit (827) (990)
Total reclassifications, net of tax 3,113 3,724
Net benefit plan assets and (obligations) recognized in shareholders' equity    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total other comprehensive loss 1,105 1,394
Income tax (expense) benefit (232) (293)
Other comprehensive (loss) income, net of tax 873 1,101
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance, beginning of period (55,316)  
Other comprehensive income before reclassifications 0  
Less: Amounts reclassified from AOCI (873)  
Balance, end of period (54,443)  
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 (1,105) (1,394)
Income tax (expense) benefit 232 293
Total reclassifications, net of tax $ (873) $ (1,101)