Weighted Average Number of Shares Used in Computing Earnings Per Share and Effect on Weighted Average Number of Shares of Diluted Potential Common Stock (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Weighted Average Shares Used In Computing Earnings Per Share [Line Items]
Net Income	$ 383		$ 884		$ 1,516		$ 2,131
Preferred stock dividends and accretion	(44)		(246)		(133)		(633)
Net Income-Common	339		638		1,383		1,498
Weighted average number of shares outstanding	2,934,955		2,904,128		2,910,653		2,898,505
Weighted average number of shares outstanding and potential dilution	2,986,271		2,958,466		2,987,561		2,952,843
Basic earnings per share	$ 0.12	[1]	$ 0.22	[1]	$ 0.48	[1]	$ 0.52	[1]
Diluted earnings per share	$ 0.11	[1]	$ 0.21	[1]	$ 0.46	[1]	$ 0.51	[1]
Restricted Stock
Weighted Average Shares Used In Computing Earnings Per Share [Line Items]
Restricted Stock	45,270		45,270		47,150		45,270
Stock Options
Weighted Average Shares Used In Computing Earnings Per Share [Line Items]
Restricted Stock	6,046		9,068		29,758		9,068
TARP Dividends
Weighted Average Shares Used In Computing Earnings Per Share [Line Items]
Preferred stock dividends and accretion			(47)				(401)
TARP Accretion
Weighted Average Shares Used In Computing Earnings Per Share [Line Items]
Preferred stock dividends and accretion			(171)				(204)
SBLF Dividends
Weighted Average Shares Used In Computing Earnings Per Share [Line Items]
Preferred stock dividends and accretion	$ (44)		$ (28)		$ (133)		$ (28)

[1] Prior periods adjusted for 5 percent stock dividend paid February 29, 2012