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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, 2022
Mar. 31, 2021
Dec. 31, 2021
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]      
Beginning balance $ 5,296,800 $ 5,161,334  
Total other comprehensive income (loss), net of tax (579,744) (143,357)  
Ending balance 4,824,635 5,161,717  
Accumulated other comprehensive loss 662,065   $ 82,321
Total      
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]      
Beginning balance (82,321) 158,635  
Other comprehensive income (loss) before reclassifications (578,076) (143,643)  
Amounts reclassified from AOCI (1,668) 286  
Total other comprehensive income (loss), net of tax (579,744) (143,357)  
Ending balance (662,065) 15,278  
Net unrealized gains (losses) on investment securities available for sale      
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]      
Beginning balance (67,980) 105,669  
Other comprehensive income (loss) before reclassifications (474,459) (122,460)  
Amounts reclassified from AOCI 0 1,475  
Total other comprehensive income (loss), net of tax (474,459) (120,985)  
Ending balance (542,439) (15,316)  
Accumulated other comprehensive loss 13,300    
Net unrealized gains (losses) on cash flow hedges      
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]      
Beginning balance (14,341) 52,966  
Other comprehensive income (loss) before reclassifications (103,617) (21,183)  
Amounts reclassified from AOCI (1,668) (1,189)  
Total other comprehensive income (loss), net of tax (105,285) (22,372)  
Ending balance (119,626) $ 30,594  
Net unrealized losses on cash flow hedges      
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]      
Accumulated other comprehensive loss $ 12,100