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Investment Securities - Additional Information (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
security
shares
Jun. 30, 2020
USD ($)
shares
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items]        
Accrued interest receivable $ 47,917     $ 49,303
Carrying Value Of Investment Securities Pledged $ 3,600,000     3,600,000
Number of available for sale debt securities in unrealized loss positions | security 155      
Gross Gains on Sales of Investment Securities     $ 77  
Visa Class B Restricted Securities        
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items]        
Conversion ratio 0.016228      
Gross Gains on Sales of Investment Securities   $ 14,200    
Equity securities remaining, shares | shares 0 80,214    
Available-for-sale Securities        
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items]        
Accrued interest receivable $ 6,700     6,600
Held-to-maturity Securities        
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items]        
Accrued interest receivable $ 7,100     $ 6,800