Earnings Per Common Share - Computation of Basic and Diluted Earnings (Loss) Per Common Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]
Net income attributable to common stockholders	$ 901	$ 500	$ 3,617	$ 1,595
Weighted-average basic shares	8,004,026	7,915,039	7,985,438	7,895,318
Basic earnings per common share	$ 0.11	$ 0.06	$ 0.45	$ 0.20
Add back preferred dividends	86		256
Net income after assumed conversions	$ 987	$ 500	$ 3,873	$ 1,595
Dilutive effect of :
Convertible preferred stock	1,000,000		1,000,000
Stock options and restricted stock units	459,358	308,371	453,997	357,517
Warrants	33,672		11,224
Total weighted-average diluted shares	9,497,056	8,223,410	9,450,719	8,252,835
Diluted earnings per common share	$ 0.10	$ 0.06	$ 0.41	$ 0.19