Note 8. Fair Value Measurements (Detail) (USD $)	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011
Minimum Loan Amount for Loans Analyzed by Credit Risk	$ 250,000
Real Estate Owned, Valuation Allowance, Provision	$ 308,000	$ 3,000,000

Amount of the increase in the real estate owned valuation allowance that is charged against earnings in the period.

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

-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

-Section 563c.102

-Paragraph 11

-Chapter V

-Subsection I

-LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.10(4))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 10

-Subparagraph 4

-Article 9

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