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Common Stock and Earnings per Share (Schedule of Calculations of Basic and Diluted Earnings Per Share) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Basic                      
Net Income $ 6,089 $ 5,880 $ 5,548 $ 5,539 $ 5,786 $ 6,401 $ 6,035 $ 5,811 $ 23,056 $ 24,033 $ 23,497
Weighted-average common shares outstanding (in shares)                 11,358,609 11,479,025 11,441,158
Basic earnings per share (in dollars per share) $ 0.54 $ 0.52 $ 0.49 $ 0.48 $ 0.50 $ 0.56 $ 0.52 $ 0.51 $ 2.03 $ 2.09 $ 2.05
Diluted                      
Net Income $ 6,089 $ 5,880 $ 5,548 $ 5,539 $ 5,786 $ 6,401 $ 6,035 $ 5,811 $ 23,056 $ 24,033 $ 23,497
Weighted-average common shares outstanding (in shares)                 11,358,609 11,479,025 11,441,158
Effect of dilutive restricted stock, stock options and SARs (in shares)                 159,819 164,954 199,581
Weighted-average common shares outstanding assuming dilution (in shares)                 11,518,428 11,643,979 11,640,739
Diluted earnings per share (in dollars per share) $ 0.53 $ 0.51 $ 0.48 $ 0.48 $ 0.49 $ 0.55 $ 0.52 $ 0.50 $ 2.00 $ 2.06 $ 2.02