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Investment Securities - Non-marketable and Other Securities Additional Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Investment
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Investment
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Investment
Investment Holdings [Line Items]          
Investments in qualified affordable housing projects, net $ 419,028   $ 419,028   $ 318,575
Tax credits and other tax benefits recognized 8,705 $ 6,283 28,950 $ 16,912  
Amortization expense included in provision for income taxes 6,042 $ 4,773 20,436 $ 14,269  
Other liabilities 276,940   276,940   205,685
Fair value accounting | Unconsolidated venture capital and private equity fund investments          
Investment Holdings [Line Items]          
Nonmarketable securities $ 181,550   $ 181,550   $ 201,098
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 211   211   213