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Investment Securities - Additional Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
security
shares
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
shares
Sep. 30, 2021
USD ($)
security
shares
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items]            
Accrued interest receivable $ 46,751     $ 46,751   $ 49,303
Carrying Value Of Investment Securities Pledged 3,500,000     3,500,000   3,600,000
Gain (loss) on sale of investment securities $ (1,259) $ (1,121)   (39) $ 11,125  
Fees paid to counterparties       $ 3,800    
Number of available for sale debt securities in unrealized loss positions | security 213     213    
Gross Gains on Sales of Investment Securities $ 110     $ 3,785 14,257  
Visa Class B Restricted Securities            
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items]            
Gain (loss) on sale of investment securities         $ 11,200  
Equity securities remaining, shares | shares 0   80,214 0    
Conversion ratio       0.016228    
Gross Gains on Sales of Investment Securities     $ 14,200      
Available-for-sale Securities            
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items]            
Accrued interest receivable $ 7,900     $ 7,900   6,600
Held-to-maturity Securities            
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items]            
Accrued interest receivable $ 9,000     $ 9,000   $ 6,800