Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Calculation of both basic and diluted earnings per common share
Net income	$ 3,730	$ 1,585
Dividends and accretion on preferred stock	(358)	(381)
Net income available to common shareholders	$ 3,372	$ 1,204
Weighted average shares outstanding	25,112,004	25,057,664
Basic earnings per common share (in dollars per share)	$ 0.13	$ 0.05
Dilutive effect of share-based compensation awards, common stock warrants, and convertible perpetual preferred stock (in shares)	1,415,453	1,232,706
Weighted average diluted shares outstanding	26,527,457	26,290,370
Diluted earnings per common share (in dollars per share)	$ 0.13	$ 0.05
Options
Shares excluded from the calculation of diluted earnings per share
Shares excluded from the calculation of diluted earnings per share	325,000	321,000
Warrant
Shares excluded from the calculation of diluted earnings per share
Shares excluded from the calculation of diluted earnings per share		612,000