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, 2016 USD ($) troubled_debt_restructuring	Dec. 31, 2015 USD ($) troubled_debt_restructuring
Financing Receivable, Modifications [Line Items]
Number of TDRs \| troubled_debt_restructuring	20	17
Loans modified in TDRs	$ 96,059	$ 111,725
Commercial loans
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs	95,273	111,725
Commercial loans \| Software and internet
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs	52,646	56,790
Commercial loans \| Hardware
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs	14,870	473
Commercial loans \| Life science/healthcare
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs	24,176	51,878
Commercial loans \| Premium wine
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs	3,194	2,065
Commercial loans \| Other
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs	387	519
Consumer loans
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs	786	0
Consumer loans \| Other
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs	$ 786	$ 0

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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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

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- Definition

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=66008989&loc=SL6953682-111524

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