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Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total other comprehensive income (loss) $ 104,710 $ (80,962)
Income tax (expense) benefit (21,989) 17,003
Other comprehensive income (loss), net of tax 82,721 (63,959)
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract]    
Income before tax 190,936 180,025
Income tax benefit (expense) (38,995) (36,388)
Net income 151,941 143,637
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance, beginning of period 3,581,891  
Other comprehensive income before reclassifications 78,955  
Less: Amounts reclassified from AOCL (3,766)  
Balance, end of period 3,816,183 3,231,403
Reclassification from Accumulated Other Comprehensive Income    
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract]    
Income before tax (4,768) (716)
Income tax benefit (expense) 1,002 150
Net income (3,766) (566)
Accumulated other comprehensive (loss) income    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Other comprehensive income (loss), net of tax 82,721 (63,959)
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance, beginning of period (124,214) (43,801)
Balance, end of period (41,493) (107,760)
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) 102,621 (81,587)
Income tax (expense) benefit (21,550) 17,134
Other comprehensive income (loss), net of tax 81,071 (64,453)
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance, beginning of period (35,389)  
Other comprehensive income before reclassifications 78,955  
Less: Amounts reclassified from AOCL (2,116)  
Balance, end of period 45,682  
Net unrealized gains and (losses) on available-for-sale securities | Reclassification from Accumulated Other Comprehensive Income    
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract]    
Income before tax (2,679) (91)
Income tax benefit (expense) 563 19
Net income (2,116) (72)
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) 2,089 625
Income tax (expense) benefit (439) (131)
Other comprehensive income (loss), net of tax 1,650 494
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance, beginning of period (88,825)  
Other comprehensive income before reclassifications 0  
Less: Amounts reclassified from AOCL (1,650)  
Balance, end of period (87,175)  
Net benefit plan assets and (obligations) recognized in shareholders' equity | Reclassification from Accumulated Other Comprehensive Income    
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract]    
Income before tax (2,089) (625)
Income tax benefit (expense) 439 131
Net income $ (1,650) $ (494)