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	9 Months Ended
Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Financing Receivable, Impaired [Line Items]
Average impaired loans	$ 169,359	$ 101,643	$ 165,062	$ 67,991
Interest income on impaired loans	990	0	1,820	0
Commercial Portfolio Segment \| Software and internet
Financing Receivable, Impaired [Line Items]
Average impaired loans	61,481	77,156	84,005	54,543
Interest income on impaired loans	70	0	133	0
Commercial Portfolio Segment \| Hardware
Financing Receivable, Impaired [Line Items]
Average impaired loans	45,353	2,796	31,000	1,944
Interest income on impaired loans	761	0	1,467	0
Commercial Portfolio Segment \| Life science/healthcare
Financing Receivable, Impaired [Line Items]
Average impaired loans	55,558	17,184	42,857	6,526
Interest income on impaired loans	128	0	128	0
Commercial Portfolio Segment \| Premium wine
Financing Receivable, Impaired [Line Items]
Average impaired loans	1,291	1,213	1,834	1,245
Interest income on impaired loans	19	0	54	0
Commercial Portfolio Segment \| Other
Financing Receivable, Impaired [Line Items]
Average impaired loans	3,768	3,132	4,369	3,498
Interest income on impaired loans	6	0	21	0
Commercial Portfolio Segment \| Commercial loans
Financing Receivable, Impaired [Line Items]
Average impaired loans	167,451	101,481	164,065	67,756
Interest income on impaired loans	984	0	1,803	0
Consumer Portfolio Segment \| Real estate secured loans
Financing Receivable, Impaired [Line Items]
Average impaired loans	584	162	282	180
Interest income on impaired loans	0	0	0	0
Consumer Portfolio Segment \| Other consumer loans
Financing Receivable, Impaired [Line Items]
Average impaired loans	1,324	0	715	55
Interest income on impaired loans	6	0	17	0
Consumer Portfolio Segment \| Consumer loans
Financing Receivable, Impaired [Line Items]
Average impaired loans	1,908	162	997	235
Interest income on impaired loans	$ 6	$ 0	$ 17	$ 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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