Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Basic
Net income	$ 6,035	$ 6,073	$ 11,846	$ 12,105
Weighted-average common shares outstanding	11,489,423	11,428,984	11,483,801	11,425,525
Basic earnings per share	$ 0.52	$ 0.53	$ 1.03	$ 1.06
Diluted
Net Income	$ 6,035	$ 6,073	$ 11,846	$ 12,105
Weighted-average common shares outstanding	11,489,423	11,428,984	11,483,801	11,425,525
Effect of dilutive restricted stock, stock options and stock appreciation rights	169,724	187,403	182,146	181,169
Weighted-average common shares outstanding assuming dilution	11,659,147	11,616,387	11,665,947	11,606,694
Diluted earnings per share	$ 0.52	$ 0.52	$ 1.02	$ 1.04