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Loans and Allowance for Loan Losses - Aging of Gross Loans, Broken out by Portfolio Segment and Class of Financing Receivable (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due $ 50,434 $ 32,346
Current 19,178,494 16,824,785
Loans Past Due 90 Days or More Still Accruing Interest 125 0
Total gross loans excluding impaired loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 40,929 24,792
Current 19,020,852 16,649,655
Loans Past Due 90 Days or More Still Accruing Interest 125 0
Impaired loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 9,505 7,554
Current 157,642 175,130
Loans Past Due 90 Days or More Still Accruing Interest 0 0
30 - 59 Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 31,362 10,800
30 - 59 Days Past Due | Total gross loans excluding impaired loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 31,362 10,467
30 - 59 Days Past Due | Impaired loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 333
60 - 89 Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 12,029 14,325
60 - 89 Days Past Due | Total gross loans excluding impaired loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 9,442 14,325
60 - 89 Days Past Due | Impaired loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 2,587 0
Greater Than 90 Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 7,043 7,221
Greater Than 90 Days Past Due | Total gross loans excluding impaired loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 125 0
Greater Than 90 Days Past Due | Impaired loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 6,918 7,221
Commercial Portfolio Segment | Software and internet    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 14,749 10,022
Current 5,359,727 5,371,222
Loans Past Due 90 Days or More Still Accruing Interest 59 0
Commercial Portfolio Segment | Hardware    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 11,486 1,127
Current 1,095,263 1,051,368
Loans Past Due 90 Days or More Still Accruing Interest 0 0
Commercial Portfolio Segment | Private equity/venture capital    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 73 17
Current 7,465,573 5,511,912
Loans Past Due 90 Days or More Still Accruing Interest 51 0
Commercial Portfolio Segment | Life science/healthcare    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 999 7,390
Current 1,690,070 1,665,801
Loans Past Due 90 Days or More Still Accruing Interest 0 0
Commercial Portfolio Segment | Premium wine    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 12,265 81
Current 860,353 847,249
Loans Past Due 90 Days or More Still Accruing Interest 0 0
Commercial Portfolio Segment | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 111 36
Current 479,754 438,313
Loans Past Due 90 Days or More Still Accruing Interest 15 0
Commercial Portfolio Segment | Commercial loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 39,683 18,673
Current 16,950,740 14,885,865
Loans Past Due 90 Days or More Still Accruing Interest 125 0
Commercial Portfolio Segment | 30 - 59 Days Past Due | Software and internet    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 11,975 3,384
Commercial Portfolio Segment | 30 - 59 Days Past Due | Hardware    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 4,909 1,061
Commercial Portfolio Segment | 30 - 59 Days Past Due | Private equity/venture capital    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 18 0
Commercial Portfolio Segment | 30 - 59 Days Past Due | Life science/healthcare    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 856 853
Commercial Portfolio Segment | 30 - 59 Days Past Due | Premium wine    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 12,265 16
Commercial Portfolio Segment | 30 - 59 Days Past Due | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 93 14
Commercial Portfolio Segment | 30 - 59 Days Past Due | Commercial loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 30,116 5,328
Commercial Portfolio Segment | 60 - 89 Days Past Due | Software and internet    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 2,715 6,638
Commercial Portfolio Segment | 60 - 89 Days Past Due | Hardware    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 6,577 66
Commercial Portfolio Segment | 60 - 89 Days Past Due | Private equity/venture capital    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 4 17
Commercial Portfolio Segment | 60 - 89 Days Past Due | Life science/healthcare    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 143 6,537
Commercial Portfolio Segment | 60 - 89 Days Past Due | Premium wine    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 65
Commercial Portfolio Segment | 60 - 89 Days Past Due | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 3 22
Commercial Portfolio Segment | 60 - 89 Days Past Due | Commercial loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 9,442 13,345
Commercial Portfolio Segment | Greater Than 90 Days Past Due | Software and internet    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 59 0
Commercial Portfolio Segment | Greater Than 90 Days Past Due | Hardware    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 0
Commercial Portfolio Segment | Greater Than 90 Days Past Due | Private equity/venture capital    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 51 0
Commercial Portfolio Segment | Greater Than 90 Days Past Due | Life science/healthcare    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 0
Commercial Portfolio Segment | Greater Than 90 Days Past Due | Premium wine    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 0
Commercial Portfolio Segment | Greater Than 90 Days Past Due | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 15 0
Commercial Portfolio Segment | Greater Than 90 Days Past Due | Commercial loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 125 0
Consumer Portfolio Segment | Real estate secured loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 961 5,776
Current 1,831,891 1,537,421
Loans Past Due 90 Days or More Still Accruing Interest 0 0
Consumer Portfolio Segment | Other consumer loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 285 343
Current 238,221 226,369
Loans Past Due 90 Days or More Still Accruing Interest 0 0
Consumer Portfolio Segment | Consumer loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 1,246 6,119
Current 2,070,112 1,763,790
Loans Past Due 90 Days or More Still Accruing Interest 0 0
Consumer Portfolio Segment | 30 - 59 Days Past Due | Real estate secured loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 961 4,911
Consumer Portfolio Segment | 30 - 59 Days Past Due | Other consumer loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 285 228
Consumer Portfolio Segment | 30 - 59 Days Past Due | Consumer loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 1,246 5,139
Consumer Portfolio Segment | 60 - 89 Days Past Due | Real estate secured loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 865
Consumer Portfolio Segment | 60 - 89 Days Past Due | Other consumer loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 115
Consumer Portfolio Segment | 60 - 89 Days Past Due | Consumer loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 980
Consumer Portfolio Segment | Greater Than 90 Days Past Due | Real estate secured loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 0
Consumer Portfolio Segment | Greater Than 90 Days Past Due | Other consumer loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 0
Consumer Portfolio Segment | Greater Than 90 Days Past Due | Consumer loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due $ 0 $ 0