Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share
Stock options excluded (in shares)	61,870	410,179	81,919	434,595
Net Income
Net income	$ (249)	$ 5,811	$ 1,723	$ 8,503
Basic income available to common stockholders	(249)	5,811	1,723	8,503
Diluted income available to common stockholders plus assumed conversions	$ (249)	$ 5,811	$ 1,723	$ 8,503
Shares
Basic income available to common stockholders (in shares)	15,516,537	10,329,934	14,939,179	10,332,935
Effect of warrants and dilutive stock options (in shares)		339,071	782,083	314,655
Diluted income available to common stockholders plus assumed conversions (in shares)	15,516,537	10,669,005	15,721,262	10,647,590
Per Share Amount
Basic income available to common stockholders (in dollars per share)	$ (0.02)	$ 0.56	$ 0.12	$ 0.82
Diluted income available to common stockholders plus assumed conversions (in dollars per share)	$ (0.02)	$ 0.55	$ 0.11	$ 0.80