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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 ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]        
Beginning balance $ 5,638,642 $ 5,076,672 $ 5,266,251 $ 5,144,148
Total other comprehensive income, net of tax amount 62,424 276,588 293,968 343,287
Ending balance 5,839,204 5,378,171 5,839,204 5,378,171
Unrealized losses on investment securities available for sale related to residual tax effects remaining in OCI     10,200 10,200
Unrealized gain (loss) on cash flow hedges related to residual tax effects remaining in OCI     11,600 11,600
Total        
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]        
Beginning balance (739,221) (1,050,374) (970,765) (1,117,073)
Other comprehensive income (loss) before reclassifications 37,860 233,655 216,097 32,112
Amounts reclassified from AOCI 24,564 42,933 77,871 311,175
Total other comprehensive income, net of tax amount 62,424 276,588 293,968 343,287
Ending balance (676,797) (773,786) (676,797) (773,786)
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 (466,163) (521,780) (492,828) 0
Other comprehensive income (loss) before reclassifications 0 0 0 (537,434)
Amounts reclassified from AOCI 15,271 15,044 41,936 30,698
Total other comprehensive income, net of tax amount 15,271 15,044 41,936 (506,736)
Ending balance (450,892) (506,736) (450,892) (506,736)
Net unrealized gains (losses) on investment securities AFS        
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]        
Beginning balance (270,842) (410,553) (411,413) (998,259)
Other comprehensive income (loss) before reclassifications 43,892 193,466 184,463 586,495
Amounts reclassified from AOCI (1,321) 0 (1,321) 194,677
Total other comprehensive income, net of tax amount 42,571 193,466 183,142 781,172
Ending balance (228,271) (217,087) (228,271) (217,087)
Net unrealized gains (losses) on cash flow hedges        
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]        
Beginning balance (2,216) (118,041) (66,524) (118,814)
Other comprehensive income (loss) before reclassifications (6,032) 40,189 31,634 (16,949)
Amounts reclassified from AOCI 10,614 27,889 37,256 85,800
Total other comprehensive income, net of tax amount 4,582 68,078 68,890 68,851
Ending balance $ 2,366 $ (49,963) $ 2,366 $ (49,963)