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Investment Securities - Additional Information (Details)
 12 Months Ended
Dec. 31, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Summary of Investment Holdings [Line Items]      
Securities pledged to secure public and other funds, carrying value $ 7,400,000,000 $ 8,400,000,000  
Transfers from available-for-sale to held-to-maturity 110,000,000.0 127,600,000  
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 $ 55,300,000 50,300,000  
Number of securities in security portfolio | security 3,006    
Number of securities in unrealized loss position | security 2,639    
Equity securities, at fair value $ 91,996,000 80,372,000  
(Losses) gains on equity securities 900,000 21,500,000 $ (4,900,000)
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 609,200,000 449,300,000  
Other Assets | Partnership Interest      
Summary of Investment Holdings [Line Items]      
Equity securities without readily determinable fair value 318,500,000 252,200,000  
Other Assets | Initiatives in Low-to-Moderate Income Neighborhoods      
Summary of Investment Holdings [Line Items]      
Equity securities without readily determinable fair value $ 290,700,000 197,100,000  
Indiana      
Summary of Investment Holdings [Line Items]      
Investment securities issued by states and political subdivisions, market value   $ 600,900,000  
State and political subdivision investment, equity percentage   10.80%  
Percentage of municipal bonds rated A or better   99.60%  
Percentage of non rated local interest bonds   0.40%