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Shareholders' Equity and Other Comprehensive Income (Loss) - OCI (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]          
Beginning balance     $ 5,119,993    
Other comprehensive income (loss) before reclassifications $ (40,216) $ (138,191) (201,543) $ (14,804)  
Amounts reclassified from AOCI 238,036 32,343 268,242 61,746  
Other comprehensive income (loss), net of income taxes 197,820 (105,848) 66,699 46,942  
Ending balance 5,053,606   5,053,606    
Accumulated other comprehensive income (loss), net (1,050,374)   (1,050,374)   $ (1,117,073)
Total          
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]          
Beginning balance (1,248,194) (1,289,327) (1,117,073) (1,442,117)  
Other comprehensive income (loss), net of income taxes 197,820 (105,848) 66,699 46,942  
Ending balance (1,050,374) (1,395,175) (1,050,374) (1,395,175)  
Net unamortized holding (losses) gains on AFS investment securities transferred to HTM          
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]          
Beginning balance 0 0 0 0  
Other comprehensive income (loss) before reclassifications (537,434) 0 (537,434) 0  
Amounts reclassified from AOCI 15,654 0 15,654 0  
Other comprehensive income (loss), net of income taxes (521,780) 0 (521,780) 0  
Ending balance (521,780) 0 (521,780) 0  
Net unrealized gains (losses) on investment securities AFS          
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]          
Beginning balance (1,116,309) (1,105,221) (998,259) (1,220,263)  
Other comprehensive income (loss) before reclassifications 511,079 (82,866) 393,029 32,955  
Amounts reclassified from AOCI 194,677 0 194,677 (779)  
Other comprehensive income (loss), net of income taxes 705,756 (82,866) 587,706 32,176  
Ending balance (410,553) (1,188,087) (410,553) (1,188,087)  
Accumulated other comprehensive income (loss), net (10,200) (13,300) (10,200) (13,300)  
Net unrealized gains (losses) on cash flow hedges          
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]          
Beginning balance (131,885) (184,106) (118,814) (221,854)  
Other comprehensive income (loss) before reclassifications (13,861) (55,325) (57,138) (47,759)  
Amounts reclassified from AOCI 27,705 32,343 57,911 62,525  
Other comprehensive income (loss), net of income taxes 13,844 (22,982) 773 14,766  
Ending balance (118,041) (207,088) (118,041) (207,088)  
Accumulated other comprehensive income (loss), net $ (11,600) $ (12,100) $ (11,600) $ (12,100)