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Investment Securities - Additional Information (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
security
instrument
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
security
instrument
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Summary of Investment Holdings [Line Items]          
Transferred from available-for-sale to held-for-maturity $ 132,300,000   $ 132,300,000   $ 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 $ 38,000,000   $ 38,000,000   50,900,000
Number of securities in security portfolio | security 3,007   3,007    
Number of securities in unrealized loss position | security 2,917   2,917    
Fair Value $ 6,414,761,000   $ 6,414,761,000   6,773,712,000
Unrealized losses 1,143,301,000   1,143,301,000   847,474,000
Equity securities, at fair value 69,880,000   69,880,000   52,507,000
Losses on equity securities 800,000 $ 700,000 1,400,000 $ 4,900,000  
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 418,300,000   418,300,000   396,800,000
Other Assets | Partnership Interest          
Summary of Investment Holdings [Line Items]          
Equity securities without readily determinable fair value 242,300,000   242,300,000    
Other Assets | Initiatives in Low-to-Moderate Income Neighborhoods          
Summary of Investment Holdings [Line Items]          
Equity securities without readily determinable fair value $ 176,000,000   $ 176,000,000    
Pooled trust preferred securities          
Summary of Investment Holdings [Line Items]          
Number of instruments held | instrument 2   2    
Fair Value $ 11,125,000   $ 11,125,000   10,811,000
Unrealized losses $ 2,669,000   $ 2,669,000   $ 2,972,000