Recorded Investment in Loans Modified in TDRs (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period	$ 13,571	[1]	$ 3,926	[1]	$ 16,424	[1]	$ 3,926	[1]
Commercial loans
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period	13,282		3,926		16,013		3,926
Commercial loans | Software
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period			605		100		605
Commercial loans | Hardware
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period	12,747		3,321		13,198		3,321
Commercial loans | Premium wine
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period					275
Commercial loans | Other loans
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period	535				2,440
Consumer loans
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period	289				411
Consumer loans | Real estate secured loans
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period	$ 289				$ 411

[1] During the three and six months ended June 30, 2012, we had partial charge-offs of $10.0 million and $10.9 million, respectively, on loans classified as TDRs. There were no partial charge-offs on loans classified as TDRs during the three and six months ended June 30, 2011.