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Investment Securities - Additional Information (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
security
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
security
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Summary of Investment Holdings [Line Items]          
Investment securities held to maturity $ 3,096,567,000   $ 3,096,567,000   $ 0
Fair value of securities transferred to held-for-maturity     3,000,000,000    
Unrealized loss     125,200,000    
Transferred from available-for-sale to held-for-maturity 154,700,000   154,700,000    
Allowance for credit losses for available-for-sale debt securities 0   0   0
Allowance for securities held-to-maturity (150,000)   (150,000)    
Accrued interest receivable $ 39,900,000   $ 39,900,000   35,500,000
Number of securities in security portfolio | security 3,201   3,201    
Number of securities in unrealized loss position | security 2,970   2,970    
Equity securities, at fair value $ 51,846,000   $ 51,846,000   13,211,000
(Losses) gains on equity securities (700,000) $ 100,000 (4,900,000) $ 300,000  
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 322,300,000   322,300,000   $ 186,000,000
Other Assets | Partnership Interest          
Summary of Investment Holdings [Line Items]          
Equity securities without readily determinable fair value 185,900,000   185,900,000    
Other Assets | Initiatives in Low-to-Moderate Income Neighborhoods          
Summary of Investment Holdings [Line Items]          
Equity securities without readily determinable fair value $ 136,400,000   $ 136,400,000