Earning Per Common Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Common Share [Abstract]
Income from continuing operations	$ 9,119	$ 9,793	$ 19,616	$ 22,001
Income from discontinued operations	(3)		11	14
Net income	$ 9,116	$ 9,793	$ 19,627	$ 22,015
Weighted average shares	10,239	10,182	10,220	10,171
Denominator for basic earnings per common share	10,239	10,182	10,220	10,171
Employee stock options	4	11	7	11
Other stock compensation plans	92	88	98	73
Dilutive potential common shares	96	99	105	84
Denominator for diluted earnings per common share - adjusted weighted average shares and assumed conversions	10,335	10,281	10,325	10,255
Basic earnings per common share: From continuing operations	$ 0.89	$ 0.96	$ 1.92	$ 2.16
Basic earnings per common share: From discontinued operations	$ 0.00		$ 0.00	$ 0.00
Basic earnings per common share	$ 0.89	$ 0.96	$ 1.92	$ 2.16
Diluted earnings per common share: From continuing operations	$ 0.88	$ 0.95	$ 1.90	$ 2.15
Diluted earnings per common share: From discontinued operations	$ 0.00		$ 0.00	$ 0.00
Diluted earnings per common share	$ 0.88	$ 0.95	$ 1.90	$ 2.15
Common Stock, Dividends, Per Share, Cash Paid	$ 0.03	$ 0.03	$ 0.09	$ 0.09