Note 2. Use of Estimates (Detail)	6 Months Ended
Jun. 30, 2012
Use of Estimates, Quarterly Changes in Estimates	Material estimates that are particularly susceptible to significant change in the near term relate to the determination of the allowance for loan losses and the estimated fair market values of both the acquired loans and other real estate owned.

For quarterly periods, provides an entity's disclosure of any significant changes in estimates.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 270

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.10-01.(a)(5))

-URI http://asc.fasb.org/extlink&oid=6958853&loc=d3e46468-122699

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 01

-Paragraph a

-Subparagraph 5

-Article 10

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

-Publisher SEC

-Name Financial Reporting Release (FRR)

-Number 301

-Section 01

Name:	us-gaap_UseOfEstimatesQuarterlyChangesInEstimates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration