Earnings Applicable to Common Stockholders (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
Earnings Per Share Basic [Line Items]
Net income available to common stock holders, basic	$ 766	$ 660	$ 2,562	$ 1,660
Net income available to common stock holders, diluted	$ 766	$ 660	$ 2,562	$ 1,660
Weighted average number of shares outstanding, basic	3,108,867	3,066,072	3,099,024	3,062,311
Effect of dilutive shares:
Restricted stock grants	26,378	9,379	26,378	9,379
Weighted average number of shares outstanding, diluted	3,135,245	3,075,451	3,125,402	3,071,690
Basic per share	$ 0.25	$ 0.22	$ 0.83	$ 0.54
Diluted per share	$ 0.24	$ 0.21	$ 0.82	$ 0.54