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Investment Securities - Additional Information (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
security
Sep. 30, 2022
USD ($)
security
Dec. 31, 2021
USD ($)
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items]      
Accrued interest receivable $ 50,143,000 $ 50,143,000 $ 45,242,000
Reclassification of fair value from available of sale investment securities to held to maturity investment securities 1,300,000,000    
Reclassified unrealized after-tax losses 176,700,000    
Gains or Losses recognized at Reclassification   0  
Carrying Value Of Investment Securities Pledged $ 3,500,000,000 $ 3,500,000,000 2,900,000,000
Number of available for sale debt securities in unrealized loss positions | security 383 383  
Available-for-sale Securities      
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items]      
Accrued interest receivable $ 6,800,000 $ 6,800,000 8,400,000
Held-to-maturity Securities      
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items]      
Accrued interest receivable $ 9,200,000 $ 9,200,000 $ 8,200,000