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Investment Securities - Additional Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2020
USD ($)
shares
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
security
shares
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]          
Accrued Interest Receivable     $ 57,370   $ 46,476
Carrying value of investment securities which were pledged to secure deposits of government entities and repos     $ 3,800,000   2,600,000
Number of available for sale securities in unrealized loss positions | security     84    
Gross Gains on Sales of Investment Securities   $ 38 $ 14,257 $ 7,701  
Visa Conversion Rate Swap Agreement          
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     $ 6,400   7,500
Held-to-maturity Securities          
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]          
Accrued Interest Receivable     $ 8,200   $ 8,100