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Investment Securities - Non-marketable and Other Securities Additional Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Investment
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Investment
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Investment
Investment Holdings [Line Items]          
Investments in qualified affordable housing projects, net $ 560,983   $ 560,983   $ 458,476
Tax credits and other tax benefits recognized 15,290 $ 8,705 46,772 $ 28,950  
Amortization expense included in provision for income taxes 10,222 6,042 32,081 20,436  
Other liabilities 332,031   332,031   302,031
Unrealized gains 30,187 $ 7,995 35,629 $ 19,787  
BigCommerce Holdings, Inc.          
Investment Holdings [Line Items]          
Equity Securities, FV-NI, Unrealized Gain (Loss) 108,400        
Fair value accounting | Unconsolidated venture capital and private equity fund investments          
Investment Holdings [Line Items]          
Nonmarketable securities $ 152,367   $ 152,367   $ 178,217
Upper Limit          
Investment Holdings [Line Items]          
Percentage of ownership 5.00%        
Non-marketable securities | Fair value accounting | Unconsolidated venture capital and private equity fund investments          
Investment Holdings [Line Items]          
Number of investments | Investment 179   179   205