Allowance for Loan Losses - Internal Risk Rating Grades are Assigned to Commercial Loans not Secured (Detail) (USD $)	Jun. 30, 2013	Dec. 31, 2012
INTERNAL RISK RATING GRADES
Loan Receivables	$ 93,612,645	$ 98,046,533
Pass [Member]
INTERNAL RISK RATING GRADES
Loan Receivables	67,128,073	71,075,442
Watch [Member]
INTERNAL RISK RATING GRADES
Loan Receivables	17,125,157	17,117,722
Special Mention [Member]
INTERNAL RISK RATING GRADES
Loan Receivables	4,768,196	4,835,215
Substandard [Member]
INTERNAL RISK RATING GRADES
Loan Receivables	4,391,219	4,818,154
Doubtful [Member]
INTERNAL RISK RATING GRADES
Loan Receivables	200,000	200,000
Construction, Land and Land Development [Member]
INTERNAL RISK RATING GRADES
Loan Receivables	27,485,747	29,024,294
Construction, Land and Land Development [Member] | Pass [Member]
INTERNAL RISK RATING GRADES
Loan Receivables	19,972,838	21,877,355
Construction, Land and Land Development [Member] | Watch [Member]
INTERNAL RISK RATING GRADES
Loan Receivables	4,707,724	4,746,266
Construction, Land and Land Development [Member] | Special Mention [Member]
INTERNAL RISK RATING GRADES
Loan Receivables	1,330,659	1,162,388
Construction, Land and Land Development [Member] | Substandard [Member]
INTERNAL RISK RATING GRADES
Loan Receivables	1,274,526	1,038,285
Construction, Land and Land Development [Member] | Doubtful [Member]
INTERNAL RISK RATING GRADES
Loan Receivables	200,000	200,000
Farmland [Member]
INTERNAL RISK RATING GRADES
Loan Receivables	1,348,947	1,442,757
Farmland [Member] | Pass [Member]
INTERNAL RISK RATING GRADES
Loan Receivables	1,348,947	1,442,757
Commercial Mortgages (Non-Owner Occupied) [Member]
INTERNAL RISK RATING GRADES
Loan Receivables	13,536,438	13,420,551
Commercial Mortgages (Non-Owner Occupied) [Member] | Pass [Member]
INTERNAL RISK RATING GRADES
Loan Receivables	7,431,155	7,362,289
Commercial Mortgages (Non-Owner Occupied) [Member] | Watch [Member]
INTERNAL RISK RATING GRADES
Loan Receivables	3,463,685	2,824,575
Commercial Mortgages (Non-Owner Occupied) [Member] | Special Mention [Member]
INTERNAL RISK RATING GRADES
Loan Receivables	2,301,952	2,574,371
Commercial Mortgages (Non-Owner Occupied) [Member] | Substandard [Member]
INTERNAL RISK RATING GRADES
Loan Receivables	339,646	659,316
Commercial Mortgages (Owner Occupied) [Member]
INTERNAL RISK RATING GRADES
Loan Receivables	34,168,786	33,634,384
Commercial Mortgages (Owner Occupied) [Member] | Pass [Member]
INTERNAL RISK RATING GRADES
Loan Receivables	24,558,663	23,974,131
Commercial Mortgages (Owner Occupied) [Member] | Watch [Member]
INTERNAL RISK RATING GRADES
Loan Receivables	6,673,758	6,680,142
Commercial Mortgages (Owner Occupied) [Member] | Special Mention [Member]
INTERNAL RISK RATING GRADES
Loan Receivables	335,292	338,902
Commercial Mortgages (Owner Occupied) [Member] | Substandard [Member]
INTERNAL RISK RATING GRADES
Loan Receivables	2,601,073	2,641,209
Commercial and Industrial Loans [Member]
INTERNAL RISK RATING GRADES
Loan Receivables	17,072,727	20,524,547
Commercial and Industrial Loans [Member] | Pass [Member]
INTERNAL RISK RATING GRADES
Loan Receivables	13,816,470	16,418,910
Commercial and Industrial Loans [Member] | Watch [Member]
INTERNAL RISK RATING GRADES
Loan Receivables	2,279,990	2,866,739
Commercial and Industrial Loans [Member] | Special Mention [Member]
INTERNAL RISK RATING GRADES
Loan Receivables	800,293	759,554
Commercial and Industrial Loans [Member] | Substandard [Member]
INTERNAL RISK RATING GRADES
Loan Receivables	$ 175,974	$ 479,344