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Investment Securities - Additional Information (Details)
 12 Months Ended
Dec. 31, 2025
USD ($)
security
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Summary of Investment Holdings [Line Items]      
Securities pledged to secure public and other funds, carrying value $ 7,900,000,000 $ 7,400,000,000  
Transfers from available-for-sale to held-to-maturity 94,100,000 110,000,000.0  
Allowance for credit losses for available-for-sale debt securities $ 0 $ 0  
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest  
Allowance for securities held-to-maturity $ 150,000 $ 150,000  
Accrued interest receivable $ 70,100,000 55,300,000  
Number of securities in security portfolio | security 3,159    
Number of securities in unrealized loss position | security 2,179    
Equity securities, at fair value $ 128,857,000 91,996,000  
(Losses) gains on equity securities 900,000 900,000 $ 21,500,000
Downward adjustments on equity securities without readily determinable fair value 0 0 0
Impairments on equity securities without readily determinable fair value 0 0 $ 0
Other Assets      
Summary of Investment Holdings [Line Items]      
Equity securities without readily determinable fair value 1,000,000,000.0 609,200,000  
Other Assets | Partnership Interest      
Summary of Investment Holdings [Line Items]      
Equity securities without readily determinable fair value 606,500,000 318,500,000  
Other Assets | Initiatives in Low-to-Moderate Income Neighborhoods      
Summary of Investment Holdings [Line Items]      
Equity securities without readily determinable fair value $ 410,000,000.0 $ 290,700,000