Loans and Allowance for Loan Losses - Recorded Investment in Loans Modified in TDRs (Detail) - USD ($)	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Financing Receivable, Modifications [Line Items]
Financing receivable modifications recorded investment modified during period	$ 5,188,000	$ 27,525,000	$ 6,817,000	$ 29,565,000
Loans classified as TDRs, charge-offs	500,000		4,300,000	0
Financing receivable modifications recorded investment subsequently defaulted	1,980,000	27,525,000	1,980,000	27,525,000
Commercial loans
Financing Receivable, Modifications [Line Items]
Financing receivable modifications recorded investment modified during period	4,402,000	27,525,000	6,031,000	29,565,000
Commercial Portfolio Segment \| Software and internet
Financing Receivable, Modifications [Line Items]
Financing receivable modifications recorded investment modified during period	4,402,000	27,525,000	5,525,000	27,525,000
Financing receivable modifications recorded investment subsequently defaulted	1,474,000	27,525,000	1,474,000	27,525,000
Commercial Portfolio Segment \| Hardware
Financing Receivable, Modifications [Line Items]
Financing receivable modifications recorded investment modified during period	0	0	0	2,040,000
Commercial Portfolio Segment \| Premium wine
Financing Receivable, Modifications [Line Items]
Financing receivable modifications recorded investment modified during period	0	0	506,000	0
Financing receivable modifications recorded investment subsequently defaulted	506,000	0	506,000	0
Consumer Portfolio Segment \| Other
Financing Receivable, Modifications [Line Items]
Financing receivable modifications recorded investment modified during period	786,000	0	786,000	0
Consumer Portfolio Segment \| Consumer loans
Financing Receivable, Modifications [Line Items]
Financing receivable modifications recorded investment modified during period	786,000	0	786,000	0
Payment deferrals granted
Financing Receivable, Modifications [Line Items]
Financing receivable modifications recorded investment modified during period	$ 5,200,000	$ 27,500,000	5,700,000	$ 29,600,000
Principal Forgiveness [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable modifications recorded investment modified during period			$ 1,100,000

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

No definition available.

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- Definition

Financing Receivable Modifications Recorded Investment Subsequently Defaulted

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Reflects the amount of the write-down related to a troubled debt restructuring.

+ 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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