Summary of Organization - Additional Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Dec. 31, 2010
Organization [Line Items]
Entity Incorporation Date Of Incorporation					Jun. 23, 1995
Entity Incorporation State Country Name					Hattiesburg, Mississippi
Asset	$ 725,668				$ 725,668		$ 681,413
Loans, including Loans held for sale	392,960				392,960		387,928
Deposits	621,933				621,933		573,394
Stockholders' Equity	65,372			59,570	65,372	59,570	60,425	57,099
NET INCOME	872			746	2,880	1,917
Net Income applicable to common stockholders	$ 766			$ 660	$ 2,562	$ 1,660
DIVIDENDS PER SHARE COMMON	$ 0.0375	$ 0.0375	$ 0.0375	$ 0.0375	$ 0.1125	$ 0.1125