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Investment Securities - Additional Information (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
security
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
security
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Summary of Investment Holdings [Line Items]          
Investment securities held to maturity $ 3,084,186,000   $ 3,084,186,000   $ 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 161,500,000   161,500,000    
Allowance for credit losses for available-for-sale debt securities 0   0   0
Allowance for securities held-to-maturity 151,000   151,000    
Accrued interest receivable $ 50,900,000   $ 50,900,000   35,500,000
Number of securities in security portfolio | security 3,232   3,232    
Number of securities in unrealized loss position | security 2,679   2,679    
Equity securities, at fair value $ 55,879,000   $ 55,879,000   13,211,000
Gains (losses) on equity securities (2,400,000) $ 200,000 (4,200,000) $ 700,000  
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 265,700,000   265,700,000   $ 186,000,000
Other Assets | Partnership Interest          
Summary of Investment Holdings [Line Items]          
Equity securities without readily determinable fair value 143,000,000   143,000,000    
Other Assets | Initiatives in Low-to-Moderate Income Neighborhoods          
Summary of Investment Holdings [Line Items]          
Equity securities without readily determinable fair value $ 122,700,000   $ 122,700,000