Note 4. Loans and Allowance for Loan Losses (Detail) - Loans Individually Evaluated for Impairment (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
With an allowance recorded:
Recorded Investment	$ 4,661		$ 3,491
Allowance for Loan Losses Allocated	1,973	424	655
Commercial real estate:
	16,623	20,594	12,146
	14,800	15,578	11,572
	1,973	424	655
	13,248	17,823	11,163
	430	568	647
	391	507	608
Residential Real Estate Loans [Member]
With no related allowance recorded:
Unpaid Principal Balance	1,174	1,161	1,136
Recorded Investment	1,034	968	1,085
Average Impaired Loans	886	1,065	748
Interest Income Recognized	18	26	36
Cash Basis Interest Recognized	13	17	31
With an allowance recorded:
Unpaid Principal Balance	420		420
Recorded Investment	420		420
Allowance for Loan Losses Allocated	128		130
Average Impaired Loans	420		84
Interest Income Recognized	17		27
Cash Basis Interest Recognized	13		22
Commercial real estate:
	128		130
Commercial Real Estate Owner Occupied [Member]
With no related allowance recorded:
Unpaid Principal Balance	7,410	7,713	5,713
Recorded Investment	7,159	7,008	5,470
Average Impaired Loans	5,631	7,309	5,510
Interest Income Recognized	264	239	325
Cash Basis Interest Recognized	244	232	317
With an allowance recorded:
Unpaid Principal Balance	3,614
Recorded Investment	3,614
Allowance for Loan Losses Allocated	1,207
Average Impaired Loans	3,529
Interest Income Recognized	77
Cash Basis Interest Recognized	69
Commercial real estate:
	1,207
Commercial Real Estate Nonowner Occupied [Member]
With no related allowance recorded:
Unpaid Principal Balance	1,790	1,361	1,192
Recorded Investment	889	1,361	1,192
Average Impaired Loans	934	1,361	1,247
Interest Income Recognized	24	22	56
Cash Basis Interest Recognized	23	22	49
With an allowance recorded:
Unpaid Principal Balance	1,298	2,423	2,396
Recorded Investment	1,047	2,423	2,396
Allowance for Loan Losses Allocated	638	424	437
Average Impaired Loans	1,198	2,423	2,414
Interest Income Recognized	18	70	128
Cash Basis Interest Recognized	17	60	118
Commercial real estate:
	638	424	437
Construction [Member]
With no related allowance recorded:
Unpaid Principal Balance	675	679
Recorded Investment	395	679
Average Impaired Loans	488	679
Interest Income Recognized	6	19
Cash Basis Interest Recognized	6	17
With an allowance recorded:
Unpaid Principal Balance			675
Recorded Investment			675
Allowance for Loan Losses Allocated			88
Average Impaired Loans			677
Interest Income Recognized			35
Cash Basis Interest Recognized			31
Commercial real estate:
			88
Automobile Loans [Member]
With no related allowance recorded:
Unpaid Principal Balance	22
Recorded Investment	22
Average Impaired Loans	15
Interest Income Recognized	1
Cash Basis Interest Recognized	1
Home Equity Loans [Member]
With no related allowance recorded:
Unpaid Principal Balance	220
Recorded Investment	220
Average Impaired Loans	147
Interest Income Recognized	5
Cash Basis Interest Recognized	5
Commercial and Industrial [Member]
With no related allowance recorded:
Unpaid Principal Balance		7,257	614
Recorded Investment		3,139	334
Average Impaired Loans		4,986	483
Interest Income Recognized		192	40
Cash Basis Interest Recognized		$ 159	$ 40

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