Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Earnings Per Share
Stock options excluded	233,630	367,859	358,151	362,643
Net Income
Net income	$ 3,462	$ 2,460	$ 11,965	$ 8,017
Basic income available to common stockholders	3,462	2,460	11,965	8,017
Diluted income available to common stockholders plus assumed conversions	$ 3,462	$ 2,460	$ 11,965	$ 8,017
Shares
Basic income available to common stockholders (in shares)	10,330,814	10,084,626	10,332,223	10,072,984
Effect of warrants and dilutive stock options (in shares)	502,120	485,641	377,599	594,738
Diluted income available to common stockholders plus assumed conversions (in shares)	10,832,934	10,570,267	10,709,822	10,667,722
Per Share Amount
Basic income available to common stockholders (in dollars per share)	$ 0.34	$ 0.25	$ 1.16	$ 0.80
Diluted income available to common stockholders plus assumed conversions (in dollars per share)	$ 0.32	$ 0.23	$ 1.12	$ 0.75