Note 6. Loans (Detail) - Contractual Aging of the Recorded Investment in Loans (USD $)	Jun. 30, 2012	Dec. 31, 2011
Total Loans	$ 697,083,447	$ 707,797,886
Commercial Portfolio Segment [Member]
Current Loans	19,211,057	19,443,774
30-59 Past Due	36,280	58,506
60-89 Past Due	428	152,148
Over 90 Past Due	212,308	301,572
Total Past Due	249,016	512,226
Total Loans	19,460,073	19,956,000
Construction Portfolio Segment [Member]
Current Loans	43,499,768	44,707,804
30-59 Past Due	201,585	189,794
60-89 Past Due		119,174
Over 90 Past Due	1,888,767	1,583,695
Total Past Due	2,090,352	1,892,663
Total Loans	45,590,120	46,600,467
Commercial Real Estate Portfolio Segment [Member]
Current Loans	293,311,853	287,520,615
30-59 Past Due	3,139,321	3,033,167
60-89 Past Due	436,018	1,358,887
Over 90 Past Due	6,054,111	6,130,139
Total Past Due	9,629,450	10,522,193
Total Loans	302,941,303	298,042,808
Residential Portfolio Segment [Member]
Current Loans	253,201,458	268,286,798
30-59 Past Due	3,232,824	3,360,425
60-89 Past Due	2,835,475	2,702,845
Over 90 Past Due	15,417,980	14,259,315
Total Past Due	21,486,279	20,322,585
Total Loans	274,687,737	288,609,383
Multifamily Portfolio Segment [Member]
Current Loans	39,831,744	37,933,674
30-59 Past Due	120,143	415,821
Over 90 Past Due	1,152,390	1,449,371
Total Past Due	1,272,533	1,865,192
Total Loans	41,104,277	39,798,866
Unallocated Financing Receivables [Member]
Current Loans	12,546,093	14,017,731
30-59 Past Due	21,698	283,519
60-89 Past Due	274,818	14,331
Over 90 Past Due	457,328	474,781
Total Past Due	753,844	772,631
Total Loans	13,299,937	14,790,362
Total [Member]
Current Loans	661,601,973	671,910,396
30-59 Past Due	6,751,851	7,341,232
60-89 Past Due	3,546,739	4,347,385
Over 90 Past Due	25,182,884	24,198,873
Total Past Due	35,481,474	35,887,490
Total Loans	697,083,447	707,797,886
Purchase Credit Impaired Loans [Member]
Current Loans	(25,683,716)	(31,085,630)
30-59 Past Due	(495,726)	(146,855)
60-89 Past Due	(825,013)	(885,441)
Over 90 Past Due	(4,480,274)	(5,037,404)
Total Past Due	(5,801,013)	(6,069,700)
Total Loans	(31,484,729)	(37,155,330)
Total Excluding Purchase Credit Impaired Loans [Member]
Current Loans	635,918,257	640,824,766
30-59 Past Due	6,256,125	7,194,377
60-89 Past Due	2,721,726	3,461,944
Over 90 Past Due	20,702,610	19,161,469
Total Past Due	29,680,461	29,817,790
Total Loans	$ 665,598,718	$ 670,642,556