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Shareholders' Equity (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance at the beginning of the period $ 73,930 $ 67,655 $ 70,335 $ 66,668
Net income during the period 1,646 1,663 3,070 3,438
Treasury stock purchased (758) (1,200) (1,927) (2,191)
Share-based compensation 98 79 266 205
Tax benefit - stock option exercises 2 55 92 55
Exercise of stock options 32 292 1,297 456
Stock issued for acquisition 0 0 1,679 0
Unrealized gain (loss) on available-for-sale securities, net of tax (78) 54 60 (33)
Balance at end of the period $ 74,872 $ 68,598 $ 74,872 $ 68,598