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Fair Value of Financial Instruments Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Value $ 11,120,664 $ 12,620,411
Fair value 108,389 78,947
Fair value 108,581 64,438
Interest rate swaps    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value 0 810
Client interest rate derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value 11,753 10,110
Fair value 11,940 9,770
Derivatives not designated as hedging instruments | Foreign Exchange Contract [Member] | Other Assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value 414 3,057
Derivatives not designated as hedging instruments | Foreign Exchange Contract [Member] | Other liability    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value 5,201 968
U.S. treasury securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Value 6,840,502 8,909,491
U.S. agency debentures    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Value 1,567,128 2,078,375
Equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Value 72,269 5,597
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Value 11,120,664 12,620,411
Total assets 11,481,237 12,974,923
Total liabilities 108,581 64,438
Fair Value, Measurements, Recurring | Derivatives designated as hedging instruments | Interest rate swaps | Other Assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value   810
Fair Value, Measurements, Recurring | Derivatives not designated as hedging instruments | Foreign Exchange Contract [Member] | Other Assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value 96,636 68,027
Fair Value, Measurements, Recurring | Derivatives not designated as hedging instruments | Foreign Exchange Contract [Member] | Other liability    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value 96,641 54,668
Fair Value, Measurements, Recurring | Derivatives not designated as hedging instruments | Equity warrant assets | Other Assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value 123,763 131,123
Fair Value, Measurements, Recurring | Derivatives not designated as hedging instruments | Client interest rate derivatives | Other Assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value 11,753 10,110
Fair Value, Measurements, Recurring | Derivatives not designated as hedging instruments | Client interest rate derivatives | Other liability    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value   9,770
Fair Value, Measurements, Recurring | Derivatives not designated as hedging instruments | Other derivative instruments | Other liability    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value 11,940  
Fair Value, Measurements, Recurring | Fair value accounting    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-marketable securities 128,421 144,442
Fair Value, Measurements, Recurring | U.S. treasury securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Value 6,840,502 8,909,491
Fair Value, Measurements, Recurring | U.S. agency debentures    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Value 1,567,128 2,078,375
Fair Value, Measurements, Recurring | Residential mortgage-backed securities | Agency-issued collateralized mortgage obligations | Fixed rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Value 2,267,035 1,152,665
Fair Value, Measurements, Recurring | Residential mortgage-backed securities | Agency-issued collateralized mortgage obligations | Variable rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Value 373,730 474,283
Fair Value, Measurements, Recurring | Equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Value 72,269 5,597
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Value 6,840,660 8,909,666
Total assets 6,840,970 8,910,419
Total liabilities 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivatives designated as hedging instruments | Interest rate swaps | Other Assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value   0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivatives not designated as hedging instruments | Foreign Exchange Contract [Member] | Other Assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivatives not designated as hedging instruments | Foreign Exchange Contract [Member] | Other liability    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivatives not designated as hedging instruments | Equity warrant assets | Other Assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivatives not designated as hedging instruments | Client interest rate derivatives | Other Assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivatives not designated as hedging instruments | Client interest rate derivatives | Other liability    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value   0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivatives not designated as hedging instruments | Other derivative instruments | Other liability    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value 0  
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair value accounting    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-marketable securities 310 753
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. treasury securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Value 6,840,502 8,909,491
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. agency debentures    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Value 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Residential mortgage-backed securities | Agency-issued collateralized mortgage obligations | Fixed rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Value 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Residential mortgage-backed securities | Agency-issued collateralized mortgage obligations | Variable rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Value 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Value 158 175
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Value 4,280,004 3,710,745
Total assets 4,390,825 3,792,002
Total liabilities 108,581 64,438
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Derivatives designated as hedging instruments | Interest rate swaps | Other Assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value   810
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Derivatives not designated as hedging instruments | Foreign Exchange Contract [Member] | Other Assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value 96,636 68,027
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Derivatives not designated as hedging instruments | Foreign Exchange Contract [Member] | Other liability    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value 96,641 54,668
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Derivatives not designated as hedging instruments | Equity warrant assets | Other Assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value 2,432 2,310
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Derivatives not designated as hedging instruments | Client interest rate derivatives | Other Assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value 11,753 10,110
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Derivatives not designated as hedging instruments | Client interest rate derivatives | Other liability    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value   9,770
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Derivatives not designated as hedging instruments | Other derivative instruments | Other liability    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value 11,940  
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Fair value accounting    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-marketable securities 0 0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. treasury securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Value 0 0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. agency debentures    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Value 1,567,128 2,078,375
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Residential mortgage-backed securities | Agency-issued collateralized mortgage obligations | Fixed rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Value 2,267,035 1,152,665
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Residential mortgage-backed securities | Agency-issued collateralized mortgage obligations | Variable rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Value 373,730 474,283
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Value 72,111 5,422
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Value 0 0
Total assets 122,250 130,853
Total liabilities 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Derivatives designated as hedging instruments | Interest rate swaps | Other Assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value   0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Derivatives not designated as hedging instruments | Foreign Exchange Contract [Member] | Other Assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Derivatives not designated as hedging instruments | Foreign Exchange Contract [Member] | Other liability    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Derivatives not designated as hedging instruments | Equity warrant assets | Other Assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value 121,331 128,813
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Derivatives not designated as hedging instruments | Client interest rate derivatives | Other Assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Derivatives not designated as hedging instruments | Client interest rate derivatives | Other liability    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value   0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Derivatives not designated as hedging instruments | Other derivative instruments | Other liability    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value 0  
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Fair value accounting    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-marketable securities 919 2,040
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | U.S. treasury securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | U.S. agency debentures    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities | Agency-issued collateralized mortgage obligations | Fixed rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities | Agency-issued collateralized mortgage obligations | Variable rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Value 0 0
Other securities | Fair value accounting    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-marketable securities 310 753
Other securities | Fair Value, Measurements, Recurring | Fair value accounting    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-marketable securities 310 753
Other securities | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair value accounting    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-marketable securities 310 753
Other securities | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Fair value accounting    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-marketable securities 0 0
Other securities | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Fair value accounting    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-marketable securities 0 0
Other venture capital investments | Fair value accounting    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-marketable securities 919 2,040
Other venture capital investments | Fair Value, Measurements, Recurring | Fair value accounting    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-marketable securities 919 2,040
Other venture capital investments | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair value accounting    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-marketable securities 0 0
Other venture capital investments | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Fair value accounting    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-marketable securities 0 0
Other venture capital investments | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Fair value accounting    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-marketable securities 919 2,040
Venture capital and private equity fund investments | Fair value accounting    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-marketable securities 127,192 141,649
Venture capital and private equity fund investments | Fair Value, Measurements, Recurring | Fair value accounting    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-marketable securities 127,192 141,649
Venture capital and private equity fund investments | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair value accounting    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-marketable securities 0 0
Venture capital and private equity fund investments | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Fair value accounting    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-marketable securities 0 0
Venture capital and private equity fund investments | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Fair value accounting    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-marketable securities $ 0 $ 0