Fair Value Measurements - Estimated Fair Values of Financial Instruments (Detail) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Financial Assets:
Securities available-for-sale	$ 40,050,413	$ 36,700,520	[1]
Recorded Balance [Member]
Financial Assets:
Cash and due from banks	7,067,371	4,757,889
Interest-bearing deposits	28,499,652	35,166,448
Federal funds sold	303,900	48,009
Securities available-for-sale	40,050,413	36,700,520
Restricted securities	1,623,350	1,584,700
Loans, net	231,867,546	236,144,526
Accrued interest receivable	1,103,621	1,070,763
Financial Liabilities:
Non-interest-bearing deposits	54,800,212	50,467,907
Savings and other interest-bearing deposits	114,311,014	117,954,879
Time deposits	102,063,440	106,751,785
Securities sold under repurchase agreements	11,355,400	6,459,839
FHLB advances	15,000,000	15,000,000
Accrued interest payable	177,207	156,812
Recorded Balance [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial Assets:
Cash and due from banks	7,067,371	4,757,889
Interest-bearing deposits	28,499,652	35,166,448
Federal funds sold	303,900	48,009
Securities available-for-sale
Restricted securities
Loans, net
Accrued interest receivable
Financial Liabilities:
Non-interest-bearing deposits	54,800,212	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	39,018,413	35,300,520
Restricted securities
Loans, net
Accrued interest receivable	1,103,621	1,070,763
Financial Liabilities:
Non-interest-bearing deposits
Savings and other interest-bearing deposits	114,311,014	117,954,879
Time deposits
Securities sold under repurchase agreements	11,355,400	6,459,839
FHLB advances	16,128,428	16,483,342
Accrued interest payable	177,207	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	236,404,000	244,708,821
Accrued interest receivable
Financial Liabilities:
Non-interest-bearing deposits
Savings and other interest-bearing deposits
Time deposits	104,264,000	109,449,974
Securities sold under repurchase agreements
FHLB advances
Accrued interest payable

[1] Derived from the audited consolidated financial statements.