Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Numerator:
Net income	$ 5,288	$ 3,800	$ 15,131	$ 10,603
Earnings allocated to participating securities	(68)	(40)	(186)	(88)
Numerator for basic earnings per common share	5,220	3,760	14,945	10,515
Effect of reallocating undistributed earnings of participating securities	68	40	186	88
Numerator for diluted earnings per common share	$ 5,288	$ 3,800	$ 15,131	$ 10,603
Denominator:
Weighted average common shares outstanding	19,477,161	19,697,267	19,508,785	19,660,698
Effect of dilutive securities:
Stock compensation	157,529	111,691	146,221	42,797
Denominator for diluted earnings per common share	19,634,690	19,808,958	19,655,006	19,703,495
Earnings per common share:
Basic	$ 0.27	$ 0.19	$ 0.77	$ 0.53
Diluted	$ 0.27	$ 0.19	$ 0.77	$ 0.54