Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Numerator:
Net income	$ 4,161	$ 6,152	$ 8,696	$ 9,843
Earnings allocated to participating securities	(73)	(80)	(143)	(119)
Numerator for basic earnings per common share	4,088	6,072	8,553	9,724
Effect of reallocating undistributed earnings of participating securities	73	80	143	119
Numerator for diluted earnings per common share	$ 4,161	$ 6,152	$ 8,696	$ 9,843
Denominator:
Denominator for basic earnings per common share	18,666,853	19,520,967	18,714,088	19,524,859
Effect of dilutive securities:
Stock compensation	197,124	143,867	172,332	130,767
Denominator for diluted earnings per common share	18,863,977	19,664,834	18,886,420	19,655,626
Earnings per common share:
Basic	$ 0.22	$ 0.31	$ 0.46	$ 0.50
Diluted	$ 0.22	$ 0.31	$ 0.46	$ 0.50