Loss Per Common Share Computation (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Net income (loss)	$ 588	$ (14,255)
Less: Preferred stock dividends and accretion	(1,281)	(1,114)
Loss available to common shareholders	(693)	(15,369)
Weighted average common shares outstanding	1,807,911	1,744,330
Loss per common share - basic	$ (0.38)	$ (8.81)
Net income (loss)	588	(14,255)
Less: Preferred stock dividends and accretion	(1,281)	(1,114)
Loss available to common shareholders	$ (693)	$ (15,369)
Weighted average common shares outstanding for basic earnings per common share	1,807,911	1,744,330
Add: dilutive effects of assumed exercises of stock options	0	0
Average shares and dilutive potential common shares	1,807,911	1,744,330
Loss per common share - diluted	$ (0.38)	$ (8.81)