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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]          
Beginning balance $ 5,161,717 $ 5,065,205 $ 5,161,334 $ 4,941,690  
Other comprehensive income (loss), Net of Tax Amount 30,448 (53,941) (112,909) 137,329  
Ending balance 5,237,714 5,052,968 5,237,714 5,052,968  
Accumulated other comprehensive income (loss) (45,726)   (45,726)   $ (158,635)
Total          
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]          
Beginning balance 15,278 256,911 158,635 65,641  
Other comprehensive income (loss) before reclassifications 33,180 (2,309) (110,463) 195,523  
Amounts reclassified from AOCI (2,732) (51,632) (2,446) (58,194)  
Other comprehensive income (loss), Net of Tax Amount 30,448 (53,941) (112,909) 137,329  
Ending balance 45,726 202,970 45,726 202,970  
Net unrealized gains (losses) on investment securities available for sale          
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]          
Beginning balance (15,316) 194,524 105,669 83,666  
Other comprehensive income (loss) before reclassifications 34,617 (8,847) (87,843) 108,484  
Amounts reclassified from AOCI 0 (51,432) 1,475 (57,905)  
Other comprehensive income (loss), Net of Tax Amount 34,617 (60,279) (86,368) 50,579  
Ending balance 19,301 134,245 19,301 134,245  
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   13,300    
Net unrealized gains (losses) on cash flow hedges          
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]          
Beginning balance 30,594 61,925 52,966 (18,487)  
Other comprehensive income (loss) before reclassifications (1,437) 6,538 (22,620) 87,039  
Amounts reclassified from AOCI (2,732) (200) (3,921) (289)  
Other comprehensive income (loss), Net of Tax Amount (4,169) 6,338 (26,541) 86,750  
Ending balance 26,425 68,263 26,425 68,263  
Post-retirement unfunded health benefit          
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]          
Beginning balance 0 462 0 462  
Other comprehensive income (loss) before reclassifications 0 0 0 0  
Amounts reclassified from AOCI 0 0 0 0  
Other comprehensive income (loss), Net of Tax Amount 0 0 0 0  
Ending balance 0 $ 462 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   $ 12,100