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Contractual Maturities of Investment Securities (Detail) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Amortized Cost
Due within one year	$ 125,021	$ 0	$ 0
Due over one to five years	0	1,032,792	1,589,004
Due over five to ten years	400,000	304,998	304,997
Due over ten years	38,353,076	36,491,167	35,703,573
Mortgage-backed, due in monthly installments	57,523,144	61,972,542	51,337,038
Available-for-sale Securities, Amortized Cost Basis	96,401,241	99,801,499	88,934,612
Fair Value
Due within one year	125,745	0	0
Due over one to five years	0	1,046,248	1,609,925
Due over five to ten years	415,028	334,044	312,135
Due over ten years	40,881,179	38,010,415	33,168,745
Mortgage-backed, due in monthly installments	59,068,315	63,475,848	52,177,554
Available-for-sale Securities, Fair Value Disclosure	$ 100,490,267	$ 102,866,555	$ 87,268,359

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