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Shareholders' Equity (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance at the beginning of the period $ 73,769 $ 66,960 $ 70,335 $ 66,668
Net income during the period 934 1,045 1,424 1,775
Treasury stock purchased (1,169) (418) (1,169) (991)
Share-based compensation 84 67 168 126
Tax benefit - stock option exercises 3 0 90 0
Exercise of stock options 244 88 1,265 164
Stock issued for acquisition 0 0 1,679 0
Unrealized gain or loss in investments 65 (87) 138 (87)
Balance at end of the period $ 73,930 $ 67,655 $ 73,930 $ 67,655