Fair Value Measurements - Estimated Fair Values of Financial Instruments (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Financial Assets:
Securities available-for-sale	$ 39,954,790	$ 36,700,520	[1]
Recorded Balance [Member]
Financial Assets:
Cash and due from banks	7,537,010	4,757,889
Interest-bearing deposits	13,026,634	35,166,448
Federal funds sold	497,188	48,009
Securities available-for-sale	39,954,790	36,700,520
Restricted securities	1,623,350	1,584,700
Loans, net	245,885,715	235,474,626
Accrued interest receivable	1,068,966	1,070,763
Financial Liabilities:
Non-interest-bearing deposits	57,094,032	50,467,907
Savings and other interest-bearing deposits	115,334,496	117,954,879
Time deposits	99,535,358	106,751,785
Securities sold under repurchase agreements	9,430,510	6,459,839
FHLB advances	15,000,000	15,000,000
Accrued interest payable	172,361	156,812
Recorded Balance [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial Assets:
Cash and due from banks	7,537,010	4,757,889
Interest-bearing deposits	13,026,634	35,166,448
Federal funds sold	497,188	48,009
Securities available-for-sale
Restricted securities
Loans, net
Accrued interest receivable
Financial Liabilities:
Non-interest-bearing deposits	57,094,032	50,467,907
Savings and other interest-bearing deposits
Time deposits
Securities sold under repurchase agreements
FHLB advances
Accrued interest payable
Recorded Balance [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial Assets:
Cash and due from banks
Interest-bearing deposits
Federal funds sold
Securities available-for-sale	38,922,790	35,300,520
Restricted securities
Loans, net
Accrued interest receivable	1,068,966	1,070,763
Financial Liabilities:
Non-interest-bearing deposits
Savings and other interest-bearing deposits	115,334,496	117,954,879
Time deposits
Securities sold under repurchase agreements	9,430,510	6,459,839
FHLB advances	16,074,695	16,483,342
Accrued interest payable	172,361	156,812
Recorded Balance [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial Assets:
Cash and due from banks
Interest-bearing deposits
Federal funds sold
Securities available-for-sale	1,032,000	1,400,000
Restricted securities	1,623,350	1,584,700
Loans, net	251,573,000	244,038,921
Accrued interest receivable
Financial Liabilities:
Non-interest-bearing deposits
Savings and other interest-bearing deposits
Time deposits	101,560,000	109,449,974
Securities sold under repurchase agreements
FHLB advances
Accrued interest payable

[1] Derived from the audited consolidated financial statements.