Carrying Value and Estimated Fair Value of Financial Instruments (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Financial assets
Cash and due from banks	$ 19,962,984	$ 16,040,195
Interest bearing deposits with banks	784,648	684,100
Securities available-for-sale	406,625,944	398,176,402
Net loans	382,927,531	385,646,132
Financial liabilities
Deposits	687,210,459	654,788,316
Federal Home Loan Bank advances	44,586,876	34,622,359
Securities Sold under Agreement to Repurchase	64,471,725	82,420,781
Carrying Value
Financial assets
Cash and due from banks	19,962,984	16,040,195
Interest bearing deposits with banks	784,648	684,100
Securities available-for-sale	406,625,944	432,065,590
Net loans	381,472,367	384,104,766
Financial liabilities
Deposits	687,064,722	654,629,796
Federal Home Loan Bank advances	43,500,000	33,500,000
Securities Sold under Agreement to Repurchase	64,471,725	82,420,781
Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets
Cash and due from banks	19,962,984	16,040,195
Interest bearing deposits with banks	784,648	684,100
Financial liabilities
Deposits	457,546,658	422,186,092
Securities Sold under Agreement to Repurchase	64,471,725	82,420,781
Significant Other Observable Inputs (Level 2)
Financial assets
Securities available-for-sale	403,862,255	395,410,199
Significant Unobservable Inputs (Level 3)
Financial assets
Securities available-for-sale	2,763,689	2,766,203
Net loans	382,927,531	385,646,132
Financial liabilities
Deposits	229,663,801	232,602,224
Federal Home Loan Bank advances	$ 44,586,876	$ 34,622,359