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Shareholders' Equity and Other Comprehensive Income (Loss) (Changes in Accumulated Other Comprehensive Income (Loss) by Component (Net of Income Taxes)) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]        
Stockholders' Equity Attributable to Parent, Beginning Balance $ 5,161,334 $ 4,941,690    
Other comprehensive income (loss), Net of Tax Amount (143,357) 191,270    
Balance 5,161,717 5,065,205    
Accumulated other comprehensive income (loss) (15,278)     $ (158,635)
Total        
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]        
Stockholders' Equity Attributable to Parent, Beginning Balance 158,635 65,641    
Other comprehensive income (loss) before reclassifications (143,643) 197,831    
Amounts reclassified from AOCI 286 (6,561)    
Other comprehensive income (loss), Net of Tax Amount (143,357) 191,270    
Balance 15,278 256,911    
Net unrealized gains (losses) on investment securities available for sale        
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]        
Stockholders' Equity Attributable to Parent, Beginning Balance 105,669 83,666    
Other comprehensive income (loss) before reclassifications (122,460) 117,330    
Amounts reclassified from AOCI 1,475 (6,472)    
Other comprehensive income (loss), Net of Tax Amount (120,985) 110,858    
Balance (15,316) 194,524    
Net unrealized gains (losses) on investment securities available for sale | Valuation Allowance of Deferred Tax Assets        
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]        
Accumulated other comprehensive income (loss) 13,300      
Net unrealized gains (losses) on cash flow hedges        
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]        
Stockholders' Equity Attributable to Parent, Beginning Balance 52,966 (18,487)    
Other comprehensive income (loss) before reclassifications (21,183) 80,501    
Amounts reclassified from AOCI (1,189) (89)    
Other comprehensive income (loss), Net of Tax Amount (22,372) 80,412    
Balance 30,594 61,925    
Post-retirement unfunded health benefit        
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]        
Stockholders' Equity Attributable to Parent, Beginning Balance 0 462    
Other comprehensive income (loss) before reclassifications 0 0    
Amounts reclassified from AOCI 0 0    
Other comprehensive income (loss), Net of Tax Amount 0 0    
Balance $ 0 $ 462    
Net unrealized losses on cash flow hedges | Valuation Allowance of Deferred Tax Assets        
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]        
Accumulated other comprehensive income (loss)     $ 12,100