Recorded Investment in Loans Modified in TDRs (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period	$ 13,599
Commercial loans
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period	10,466	[1]
Commercial loans | Software
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period	615
Commercial loans | Hardware
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period	4,018
Commercial loans | Premium wine
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period	1,949
Commercial loans | Other loans
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period	3,884
Consumer loans
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period	3,133
Consumer loans | Other loans
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period	$ 3,133

[1] During 2011, we had partial charge-offs of $2.8 million on loans classified as TDRs.