Note 6. Loans (Detail) - Allowance for Loan Losses and the Recorded Investment in Loans by Portfolio Segment and Impairment Method (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2010
Allowance for loan losses:
Beginning balance			$ 11,012,088	$ 9,526,592	$ 9,526,592
Ending Balance	11,566,199		11,566,199		11,012,088
Charge-offs	(1,850,714)	(1,968,395)	(2,835,160)	(3,051,523)	(7,127,898)
Recoveries	67,596	52,524	389,271	79,314	243,394
Provision			3,000,000		8,370,000
Loans:
Ending balance	697,083,447		697,083,447		707,797,886
Allowance for loan losses;
Allowance for loan losses individually evaluated	6,000,080		6,000,080		5,385,314
Allowance for loan losses collectively evaluated	4,649,612		4,649,612		4,545,509
Allowance for loan losses acquired			916,507		1,081,265
Total allowance for loan losses	11,566,199	9,874,383	11,566,199	9,874,383	11,012,088	11,849,317	9,870,254	9,526,592
Loans Recorded Investment	685,517,248		685,517,248		696,785,798
Ending Balance:
Loans individually evaluated	52,821,614		52,821,614		48,513,606
Loans collectively evaluated	623,930,368		623,930,368		635,394,247
Loans acquired	20,331,465		20,331,465		23,890,033
Total ending balance loans	697,083,447		697,083,447		707,797,886
Commercial [Member]
Allowance for loan losses:
Beginning balance			163,865	412,745	412,745
Ending Balance	274,460		274,460		163,865
Charge-offs			(24,891)		(299,829)
Recoveries			5,902		10,232
Provision			129,584		40,717
Loans:
Ending balance	19,460,073		19,460,073		19,956,000
Allowance for loan losses;
Allowance for loan losses individually evaluated	130,896		130,896		24,176
Allowance for loan losses collectively evaluated	143,136		143,136		139,689
Allowance for loan losses acquired			428
Total allowance for loan losses	274,460		274,460		163,865
Loans Recorded Investment	19,185,613		19,185,613		19,792,135
Ending Balance:
Loans individually evaluated	234,569		234,569		393,391
Loans collectively evaluated	19,207,426		19,207,426		19,526,299
Loans acquired	18,078		18,078		36,310
Total ending balance loans	19,460,073		19,460,073		19,956,000
Construction Portfolio Segment [Member]
Allowance for loan losses:
Beginning balance			583,784	447,955	447,955
Ending Balance	767,052		767,052		583,784
Charge-offs			(28,502)		(256,279)
Recoveries			32,786		36,965
Provision			178,984		355,143
Loans:
Ending balance	45,590,120		45,590,120		46,600,467
Allowance for loan losses;
Allowance for loan losses individually evaluated	454,139		454,139		274,218
Allowance for loan losses collectively evaluated	312,913		312,913		309,566
Total allowance for loan losses	767,052		767,052		583,784
Loans Recorded Investment	44,823,068		44,823,068		46,016,683
Ending Balance:
Loans individually evaluated	2,518,119		2,518,119		2,227,927
Loans collectively evaluated	41,989,779		41,989,779		43,272,500
Loans acquired	1,082,222		1,082,222		1,100,040
Total ending balance loans	45,590,120		45,590,120		46,600,467
Commercial Real Estate Loans [Member]
Allowance for loan losses:
Beginning balance			3,748,857	2,819,054	2,819,054
Ending Balance	3,621,666		3,621,666		3,748,857
Charge-offs			(411,116)		(1,199,872)
Recoveries			148,348		86,453
Provision			135,577		2,043,222
Loans:
Ending balance	302,941,303		302,941,303		298,042,808
Allowance for loan losses;
Allowance for loan losses individually evaluated	1,523,133		1,523,133		1,741,553
Allowance for loan losses collectively evaluated	2,098,533		2,098,533		2,005,795
Allowance for loan losses acquired					1,509
Total allowance for loan losses	3,621,666		3,621,666		3,748,857
Loans Recorded Investment	299,319,637		299,319,637		294,293,951
Ending Balance:
Loans individually evaluated	18,500,152		18,500,152		14,815,756
Loans collectively evaluated	281,601,626		281,601,626		280,378,746
Loans acquired	2,839,525		2,839,525		2,848,306
Total ending balance loans	302,941,303		302,941,303		298,042,808
Residential Real Estate Loans [Member]
Allowance for loan losses:
Beginning balance			5,569,743	4,593,811	4,593,811
Ending Balance	5,846,161		5,846,161		5,569,743
Charge-offs			(2,137,783)		(4,971,619)
Recoveries			181,244		88,024
Provision			2,232,957		5,859,527
Loans:
Ending balance	274,687,737		274,687,737		288,609,383
Allowance for loan losses;
Allowance for loan losses individually evaluated	3,220,969		3,220,969		2,767,300
Allowance for loan losses collectively evaluated	1,709,113		1,709,113		1,722,687
Allowance for loan losses acquired			916,079		1,079,756
Total allowance for loan losses	5,846,161		5,846,161		5,569,743
Loans Recorded Investment	268,841,576		268,841,576		283,039,640
Ending Balance:
Loans individually evaluated	29,939,967		29,939,967		28,895,790
Loans collectively evaluated	229,345,432		229,345,432		240,804,604
Loans acquired	15,402,338		15,402,338		18,908,989
Total ending balance loans	274,687,737		274,687,737		288,609,383
Multifamily Portfolio Segment [Member]
Allowance for loan losses:
Beginning balance			786,919	1,010,978	1,010,978
Ending Balance	868,834		868,834		786,919
Charge-offs			(164,693)		(117,115)
Recoveries			2,065
Provision			244,543		(106,944)
Loans:
Ending balance	41,104,277		41,104,277		39,798,866
Allowance for loan losses;
Allowance for loan losses individually evaluated	579,302		579,302		523,481
Allowance for loan losses collectively evaluated	289,532		289,532		263,438
Total allowance for loan losses	868,834		868,834		786,919
Loans Recorded Investment	40,235,443		40,235,443		39,011,947
Ending Balance:
Loans individually evaluated	1,274,999		1,274,999		1,990,563
Loans collectively evaluated	38,852,170		38,852,170		36,824,488
Loans acquired	977,108		977,108		983,815
Total ending balance loans	41,104,277		41,104,277		39,798,866
Consumer Loans [Member]
Allowance for loan losses:
Beginning balance			158,920	242,049	242,049
Ending Balance	188,026		188,026		158,920
Charge-offs			(68,175)		(283,184)
Recoveries			18,926		21,720
Provision			78,355		178,335
Loans:
Ending balance	13,299,937		13,299,937		14,790,362
Allowance for loan losses;
Allowance for loan losses individually evaluated	91,641		91,641		54,586
Allowance for loan losses collectively evaluated	96,385		96,385		104,334
Total allowance for loan losses	188,026		188,026		158,920
Loans Recorded Investment	13,111,911		13,111,911		14,631,442
Ending Balance:
Loans individually evaluated	353,808		353,808		190,179
Loans collectively evaluated	12,933,935		12,933,935		14,587,610
Loans acquired	12,194		12,194		12,573
Total ending balance loans	$ 13,299,937		$ 13,299,937		$ 14,790,362