Note 4. Loans and Allowance for Loan Losses (Detail) - Allowance for Loan Losses and the Recorded Investment of Loans (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Ending allowance balance attributable to loans:
Individually evaluated for impairment	$ 1,973	$ 655	$ 424
Collectively evaluated for impairment	5,554	6,689
Total ending allowance balance	7,527	7,344
Loans:
Loans individually evaluated for impairment	14,800	11,572
Loans collectively evaluated for impairment	549,274	586,736
Total ending loans balance	564,074	598,308
Prior to Reclassification [Member] \| Residential Portfolio Segment [Member]
Loans:
Total ending loans balance		226,909
Prior to Reclassification [Member] \| Commercial Real Estate Portfolio Segment [Member]
Loans:
Total ending loans balance		219,036
Prior to Reclassification [Member] \| Commercial and Industrial [Member]
Loans:
Total ending loans balance		45,200
Prior to Reclassification [Member] \| Consumer Portfolio Segment [Member]
Loans:
Total ending loans balance		107,163
Prior to Reclassification [Member]
Loans:
Total ending loans balance		598,308
Residential Portfolio Segment [Member]
Ending allowance balance attributable to loans:
Individually evaluated for impairment	128	130
Collectively evaluated for impairment	1,315	1,730
Total ending allowance balance	1,443	1,860
Loans:
Loans individually evaluated for impairment	1,454	1,505
Loans collectively evaluated for impairment	231,676	225,404
Total ending loans balance	233,130	238,490
Commercial Real Estate Portfolio Segment [Member]
Ending allowance balance attributable to loans:
Individually evaluated for impairment	1,845	525
Collectively evaluated for impairment	2,524	2,968
Total ending allowance balance	4,369	3,493
Loans:
Loans individually evaluated for impairment	13,104	9,733
Loans collectively evaluated for impairment	170,805	209,303
Total ending loans balance	183,909
Commercial and Industrial [Member]
Ending allowance balance attributable to loans:
Collectively evaluated for impairment	653	636
Total ending allowance balance	653	636
Loans:
Loans individually evaluated for impairment		334
Loans collectively evaluated for impairment	45,982	44,866
Total ending loans balance	45,982	45,200
Consumer Portfolio Segment [Member]
Ending allowance balance attributable to loans:
Collectively evaluated for impairment	1,062	1,355
Total ending allowance balance	1,062	1,355
Loans:
Loans individually evaluated for impairment	242
Loans collectively evaluated for impairment	100,811	107,163
Total ending loans balance	$ 101,053

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- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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The balance of financing receivables that were collectively evaluated for impairment.

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- Definition

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

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

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-Name Federal Regulation (FR)

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-Section 563c.102

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-Chapter 8

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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