Loans and Allowance for Loan Losses - Average Impaired Loans, Broken out by Portfolio Segment and Class of Financing Receivable (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Financing Receivable, Impaired [Line Items]
Average impaired loans	$ 166,151	$ 62,853	$ 162,915	$ 51,164
Interest income on impaired loans	916	0	1,573	0
Commercial Portfolio Segment \| Software and internet
Financing Receivable, Impaired [Line Items]
Average impaired loans	101,168	52,747	95,268	43,236
Interest income on impaired loans	438	0	763	0
Commercial Portfolio Segment \| Hardware
Financing Receivable, Impaired [Line Items]
Average impaired loans	23,221	1,393	23,824	1,518
Interest income on impaired loans	442	0	749	0
Commercial Portfolio Segment \| Life science/healthcare
Financing Receivable, Impaired [Line Items]
Average impaired loans	33,324	1,993	36,507	1,197
Interest income on impaired loans	0	0	0	0
Commercial Portfolio Segment \| Premium wine
Financing Receivable, Impaired [Line Items]
Average impaired loans	2,040	1,239	2,106	1,261
Interest income on impaired loans	18	0	35	0
Commercial Portfolio Segment \| Other
Financing Receivable, Impaired [Line Items]
Average impaired loans	5,485	5,222	4,669	3,681
Interest income on impaired loans	7	0	15	0
Commercial Portfolio Segment \| Commercial loans
Financing Receivable, Impaired [Line Items]
Average impaired loans	165,238	62,594	162,374	50,893
Interest income on impaired loans	905	0	1,562	0
Consumer Portfolio Segment \| Real estate secured loans
Financing Receivable, Impaired [Line Items]
Average impaired loans	127	183	131	189
Interest income on impaired loans	0	0	0	0
Consumer Portfolio Segment \| Other consumer loans
Financing Receivable, Impaired [Line Items]
Average impaired loans	786	76	410	82
Interest income on impaired loans	11	0	11	0
Consumer Portfolio Segment \| Consumer loans
Financing Receivable, Impaired [Line Items]
Average impaired loans	913	259	541	271
Interest income on impaired loans	$ 11	$ 0	$ 11	$ 0

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- Definition

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5258-111524

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Amount of interest income, recognized on accrual basis, on financing receivables, for which there is a related allowance for credit losses and are recognized as impaired.

+ References

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