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
Mar. 31, 2016	Mar. 31, 2015
Financing Receivable, Impaired [Line Items]
Average impaired loans	$ 159,676	$ 39,472
Interest income on impaired loans	975	0
Commercial Portfolio Segment \| Software and internet
Financing Receivable, Impaired [Line Items]
Average impaired loans	89,367	33,725
Interest income on impaired loans	421	0
Commercial Portfolio Segment \| Hardware
Financing Receivable, Impaired [Line Items]
Average impaired loans	24,426	1,643
Interest income on impaired loans	397	0
Commercial Portfolio Segment \| Life science/healthcare
Financing Receivable, Impaired [Line Items]
Average impaired loans	39,690	400
Interest income on impaired loans	133	0
Commercial Portfolio Segment \| Premium wine
Financing Receivable, Impaired [Line Items]
Average impaired loans	2,171	1,282
Interest income on impaired loans	17	0
Commercial Portfolio Segment \| Other
Financing Receivable, Impaired [Line Items]
Average impaired loans	3,853	2,139
Interest income on impaired loans	7	0
Commercial Portfolio Segment \| Commercial loans
Financing Receivable, Impaired [Line Items]
Average impaired loans	159,507	39,189
Interest income on impaired loans	975	0
Consumer Portfolio Segment \| Real estate secured loans
Financing Receivable, Impaired [Line Items]
Average impaired loans	135	195
Interest income on impaired loans	0	0
Consumer Portfolio Segment \| Other consumer loans
Financing Receivable, Impaired [Line Items]
Average impaired loans	34	88
Interest income on impaired loans	0	0
Consumer Portfolio Segment \| Consumer loans
Financing Receivable, Impaired [Line Items]
Average impaired loans	169	283
Interest income on impaired loans	$ 0	$ 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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