Basic and Diluted EPS (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Net income (loss)	$ 5,796	$ 1,240	$ 7,178	$ 2,920
Accumulated undeclared dividends on preferred stock	(234)	(316)	(468)	(628)
Net income allocable to common shareholders(A)	5,562	924	6,710	2,292
Weighted average outstanding shares of common stock(B)	15,778,678	10,434,665	14,087,522	10,434,665
Dilutive effect of employee stock options and warrants	$ 199	$ 1,663	$ 118	$ 1,668
Common stock and common stock equivalents(C)	15,977,939	12,097,476	14,205,583	12,103,105
Income (Loss) per common share:
Basic (A/B)	$ 0.35	$ 0.09	$ 0.48	$ 0.22
Diluted (A/C)	$ 0.35	$ 0.08	$ 0.47	$ 0.19