Securities - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013 Bonds Certificate	Jun. 30, 2012	Jun. 30, 2013 Bonds Certificate	Jun. 30, 2012	Dec. 31, 2012 Bonds Certificate
Schedule of Available-for-sale Securities [Line Items]
Average yields on securities	2.27%	2.83%	2.22%	2.90%
Market value of securities	$ 12,300,000		$ 12,300,000		$ 8,100,000
Certificates deposits	2		2		3
Municipal bonds with unrealized loss position	39		39		10
Federal agencies bonds with unrealized loss position	12		12		2
Other-than-temporary impairment charge	120,000		120,000
Unrealized loss component	(48,000)		(48,000)
Company's investment in Federal Home Loan Bank stock	1,100,000		1,100,000		1,100,000
Impairment of Investment in Federal Home Loan Bank of Atlanta			0
Auction Rate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Loan Corporation auction rate securities	1,200,000		1,200,000
Percentage of Auction rate securities with provision	50.00%		50.00%
Other-than-temporary impairment charge	120,000
Unrealized loss component	48,000
Accumulated other comprehensive income	$ 31,680		$ 31,680