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Investment Securities - Non-marketable and Other Securities Additional Information (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Investment
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Investment
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Investment
Investment Holdings [Line Items]          
Investments in qualified affordable housing projects, net $ 394,046   $ 394,046   $ 318,575
Tax credits and other tax benefits recognized 10,988 $ 5,207 20,245 $ 10,629  
Amortization expense included in provision for income taxes 6,758 $ 4,705 14,394 $ 9,497  
Other liabilities 266,761   266,761   205,685
Fair value accounting | Unconsolidated venture capital and private equity fund investments          
Investment Holdings [Line Items]          
Nonmarketable securities $ 193,206   $ 193,206   $ 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 212   212   213