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Shareholders' Equity and Other Comprehensive Income (Loss) (Schedule of Changes in Accumulated Other Comprehensive Income (Loss) by Component (Net of Income Taxes)) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]          
Beginning balance $ 4,807,768,000 $ 4,584,438,000 $ 4,475,801,000 $ 5,296,800,000  
Total other comprehensive income (loss), net of tax amount (284,229,000) (507,609,000) (237,287,000) (1,451,993,000)  
Ending balance 4,561,568,000 4,229,715,000 4,561,568,000 4,229,715,000  
Accumulated other comprehensive loss 1,679,404,000   1,679,404,000   $ 1,442,117,000
Total          
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]          
Beginning balance (1,395,175,000) (1,026,705,000) (1,442,117,000) (82,321,000)  
Other comprehensive income (loss) before reclassifications (320,770,000) (515,420,000) (335,573,000) (1,448,523,000)  
Amounts reclassified from AOCI 36,541,000 7,811,000 98,286,000 (3,470,000)  
Total other comprehensive income (loss), net of tax amount (284,229,000) (507,609,000) (237,287,000) (1,451,993,000)  
Ending balance (1,679,404,000) (1,534,314,000) (1,679,404,000) (1,534,314,000)  
Net unrealized gains (losses) on investment securities available for sale          
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]          
Beginning balance (1,188,087,000) (869,519,000) (1,220,263,000) (67,980,000)  
Other comprehensive income (loss) before reclassifications (291,190,000) (430,453,000) (258,235,000) (1,231,992,000)  
Amounts reclassified from AOCI 0 0 (779,000) 0  
Total other comprehensive income (loss), net of tax amount (291,190,000) (430,453,000) (259,014,000) (1,231,992,000)  
Ending balance (1,479,277,000) (1,299,972,000) (1,479,277,000) (1,299,972,000)  
Accumulated other comprehensive loss 13,300,000   13,300,000    
Net unrealized gains (losses) on cash flow hedges          
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]          
Beginning balance (207,088,000) (157,186,000) (221,854,000) (14,341,000)  
Other comprehensive income (loss) before reclassifications (29,580,000) (84,967,000) (77,338,000) (216,531,000)  
Amounts reclassified from AOCI 36,541,000 7,811,000 99,065,000 (3,470,000)  
Total other comprehensive income (loss), net of tax amount 6,961,000 (77,156,000) 21,727,000 (220,001,000)  
Ending balance (200,127,000) $ (234,342,000) (200,127,000) $ (234,342,000)  
Accumulated other comprehensive loss $ 12,100,000   $ 12,100,000