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Loans and Leases - Narrative (Details) - USD ($)
 9 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unamortized deferred loan origination costs $ (311,400,000) $ (19,600,000)
Increase in unamortized deferred loan origination costs 291,800,000  
Total loans and leases 18,241,907,000 9,779,288,000
FRB Borrowings    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 0 0
Asset Pledged as Collateral with Right    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 6,700,000,000 3,600,000,000
Loans and Leases Receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued interest on loans and leases $ 79,400,000 $ 37,500,000