Earnings Per Share (Details) (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
Earnings Per Share
Stock options exercisable excluded from the computation of earnings per share	410,179	362,198	434,595	362,992
Net Income
Net income	$ 5,811	$ 785	$ 8,503	$ 5,557
Basic income available to common stockholders	5,811	785	8,503	5,557
Diluted income available to common stockholders plus assumed conversions	$ 5,811	$ 785	$ 8,503	$ 5,557
Shares
Basic income available to common stockholders (in shares)	10,329,934	10,084,626	10,332,935	10,067,066
Effect of warrants and dilutive stock options (in shares)	339,071	494,302	314,655	650,191
Diluted income available to common stockholders plus assumed conversions (in shares)	10,669,005	10,578,928	10,647,590	10,717,257
Per Share Amount
Basic income available to common stockholders (in dollars per share)	$ 0.56	$ 0.08	$ 0.82	$ 0.55
Diluted income available to common stockholders plus assumed conversions (in dollars per share)	$ 0.55	$ 0.08	$ 0.80	$ 0.52