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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]          
Beginning balance $ 4,824,635 $ 5,161,717 $ 5,296,800 $ 5,161,334  
Total other comprehensive income (loss), net of tax (364,640) 30,448 (944,384) (112,909)  
Ending balance 4,584,438 5,237,714 4,584,438 5,237,714  
Accumulated other comprehensive loss 1,026,705   1,026,705   $ 82,321
Total          
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]          
Beginning balance (662,065) 15,278 (82,321) 158,635  
Other comprehensive income (loss) before reclassifications (363,895) 33,180 (941,971) (110,463)  
Amounts reclassified from AOCI (745) (2,732) (2,413) (2,446)  
Total other comprehensive income (loss), net of tax (364,640) 30,448 (944,384) (112,909)  
Ending balance (1,026,705) 45,726 (1,026,705) 45,726  
Net unrealized gains (losses) on investment securities available for sale          
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]          
Beginning balance (542,439) (15,316) (67,980) 105,669  
Other comprehensive income (loss) before reclassifications (327,080) 34,617 (801,539) (87,843)  
Amounts reclassified from AOCI 0 0 0 1,475  
Total other comprehensive income (loss), net of tax (327,080) 34,617 (801,539) (86,368)  
Ending balance (869,519) 19,301 (869,519) 19,301  
Accumulated other comprehensive 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 (119,626) 30,594 (14,341) 52,966  
Other comprehensive income (loss) before reclassifications (36,815) (1,437) (140,432) (22,620)  
Amounts reclassified from AOCI (745) (2,732) (2,413) (3,921)  
Total other comprehensive income (loss), net of tax (37,560) (4,169) (142,845) (26,541)  
Ending balance (157,186) $ 26,425 (157,186) $ 26,425  
Net unrealized losses on cash flow hedges          
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]          
Accumulated other comprehensive loss $ 12,100   $ 12,100