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Investment Securities - Additional Information (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
USD ($)
instrument
security
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
instrument
security
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Summary of Investment Holdings [Line Items]          
Transferred from available-for-sale to held-for-maturity $ 137,900,000   $ 137,900,000   $ 148,900,000
Allowance for credit losses for available-for-sale debt securities 0   0   0
Allowance for securities held-to-maturity 150,000   150,000   150,000
Accrued interest receivable $ 50,600,000   $ 50,600,000   50,900,000
Number of securities in security portfolio | security 3,047   3,047    
Number of securities in unrealized loss position | security 2,808   2,808    
Fair Value $ 6,500,515,000   $ 6,500,515,000   6,773,712,000
Unrealized losses 935,766,000   935,766,000   847,474,000
Equity securities, at fair value 71,953,000   71,953,000   52,507,000
Gains (losses) on equity securities 100,000 $ (2,400,000) (700,000) $ (4,200,000)  
Impairments on equity securities without readily determinable fair value     0 $ 0  
Other Assets          
Summary of Investment Holdings [Line Items]          
Equity securities without readily determinable fair value 401,400,000   401,400,000   396,800,000
Other Assets | Partnership Interest          
Summary of Investment Holdings [Line Items]          
Equity securities without readily determinable fair value 243,100,000   243,100,000    
Other Assets | Initiatives in Low-to-Moderate Income Neighborhoods          
Summary of Investment Holdings [Line Items]          
Equity securities without readily determinable fair value $ 158,300,000   $ 158,300,000    
Pooled trust preferred securities          
Summary of Investment Holdings [Line Items]          
Number of instruments held | instrument 2   2    
Fair Value $ 10,994,000   $ 10,994,000   10,811,000
Unrealized losses $ 2,797,000   $ 2,797,000   $ 2,972,000