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Investment Securities - Additional Information (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
shares
Dec. 31, 2020
USD ($)
security
shares
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items]        
Accrued interest receivable   $ 49,303 $ 46,476  
Carrying Value Of Investment Securities Pledged   3,600,000 2,600,000 $ 2,300,000
Loss on investment related to reduction in conversion ratio   $ 500 1,000  
Number of available for sale debt securities in unrealized loss positions | security   74    
Gross Gains on Sales of Investment Securities   $ 14,257 7,810  
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 80,214 0    
Available-for-sale Securities        
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items]        
Accrued interest receivable   $ 6,600 7,500  
Held-to-maturity Securities        
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items]        
Accrued interest receivable   $ 6,800 $ 8,100