Loan Portfolio Aging Analysis (Detail) (USD $)	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	$ 1,011,465	$ 1,033,227
60-89 Days Past Due	469,503	338,186
Greater than 90 Days Past Due	806,028	1,303,818
Total Past Due	2,286,996	2,675,231
Current	172,607,118	171,526,199
Loans receivable gross	174,894,114	174,201,430	175,314,334
Total Loans >90 Days & Accruing	100
Mortgage loans on real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable gross	124,952,489	125,656,258
Mortgage loans on real estate | One-to-four family residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	680,291	289,337
60-89 Days Past Due	127,604	161,654
Greater than 90 Days Past Due	306,516	1,020,862
Total Past Due	1,114,411	1,471,853
Current	41,208,745	38,000,155
Loans receivable gross	42,323,156	39,472,008	38,110,058
Mortgage loans on real estate | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	29,434	75,924
60-89 Days Past Due	201,135
Greater than 90 Days Past Due	45,478	48,428
Total Past Due	276,047	124,352
Current	34,549,972	40,045,461
Loans receivable gross	34,826,019	40,169,813	43,056,142
Mortgage loans on real estate | Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	34,614,339	29,971,649
Loans receivable gross	34,614,339	29,971,649	30,844,997
Mortgage loans on real estate | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	196,328	511,562
60-89 Days Past Due	120,067	50,455
Greater than 90 Days Past Due	430,868	197,191
Total Past Due	747,263	759,208
Current	12,441,712	15,283,580
Loans receivable gross	13,188,975	16,042,788	16,960,319
Commercial business
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	10,105
Total Past Due	10,105
Current	26,439,397	23,198,454
Loans receivable gross	26,449,502	23,198,454	20,239,457
Agricultural business
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	8,813,230	9,590,745
Loans receivable gross	8,813,230	9,590,745	9,760,290
Consumer loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	95,307	156,404
60-89 Days Past Due	20,697	126,077
Greater than 90 Days Past Due	23,166	37,337
Total Past Due	139,170	319,818
Current	14,539,723	15,436,155
Loans receivable gross	14,678,893	15,755,973	16,343,071
Total Loans >90 Days & Accruing	$ 100