Loans and Allowance for Loan Losses - Summary of Loans Modified in Troubled Debt Restructurings ("TDRs") by Portfolio Segment and Class of Financing Receivables (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2015 USD ($) troubled_debt_restructuring	Dec. 31, 2014 USD ($) troubled_debt_restructuring	Dec. 31, 2013 USD ($)
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period	$ 110,371	$ 2,738	$ 13,848
Number of TDRs \| troubled_debt_restructuring	17	7
Loans modified in TDRs	$ 111,725	$ 7,151
Commercial loans
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period	110,371	2,738	13,842
Loans modified in TDRs	111,725	7,026
Commercial loans \| Software and internet
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period	56,790	1,033	4,932
Loans modified in TDRs	56,790	3,784
Commercial loans \| Hardware
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period	286	1,118	8,143
Loans modified in TDRs	473	1,118
Commercial loans \| Life science/healthcare
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period	51,878	0	0
Loans modified in TDRs	51,878	0
Commercial loans \| Premium wine
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period	898	587	0
Loans modified in TDRs	2,065	1,891
Commercial loans \| Other
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period	519	0	690
Loans modified in TDRs	519	233
Consumer loans
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period	0	0	6
Loans modified in TDRs	0	125
Consumer loans \| Other
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period	0	0	$ 6
Loans modified in TDRs	$ 0	125
Payment Deferrals Granted
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period		1,700
Forgiveness Of Principal
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period		$ 1,000

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings during the period.

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+ References

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The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554

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Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953682-111524

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