Fair Value - Amount Of Gains and Losses From Changes In Fair Value Included In Earnings (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Interest income	$ 15	$ 11	$ 34	$ 29
Interest expense
Change in fair value	9	20	13	8
Total change in fair value	$ 24	$ 31	$ 47	$ 37

The amount of interest and fee income earned from loans held-for-sale, including mortgage loans, and interest earned from direct financing and sales-type leases held-for-sale.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.1)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 1

-Article 9

Name:	us-gaap_InterestAndFeeIncomeLoansAndLeasesHeldForSale
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration