Note 7. Segment Information (Detail) - Segment Reporting (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Net interest income	$ 8,053	$ 8,154	$ 16,965	$ 17,357
Provision expense	524	759	1,840	3,703
Noninterest income	1,974	1,687	5,453	5,346
Noninterest expense	7,162	6,981	14,494	14,079
Tax expense	622	546	1,743	1,333
Net income	1,719	1,555	4,341	3,588
Assets	801,372	838,290	801,372	838,290	804,177
Banking [Member]
Net interest income	7,426	7,549	15,083	15,551
Provision expense	576	822	1,787	6,645
Noninterest income	1,823	1,540	4,888	4,613
Noninterest expense	6,588	6,424	13,315	12,976
Tax expense	536	459	1,332	867
Net income	1,549	1,384	3,537	2,676
Assets	787,885	825,051	787,885	825,051
Consumer Finance [Member]
Net interest income	627	605	1,882	1,806
Provision expense	(52)	(63)	53	58
Noninterest income	151	147	565	733
Noninterest expense	574	557	1,179	1,103
Tax expense	86	87	411	466
Net income	170	171	804	912
Assets	$ 13,487	$ 13,239	$ 13,487	$ 13,239