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Summary of Significant Accounting Policies (Per Share Data) (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
Numerator:                      
Net income $ 3,277 $ 2,562 $ 614 $ 3,694 $ 4,004 $ 3,883 $ 3,385 $ 2,856 $ 10,147 $ 14,128 $ 14,390
Denominator for basic net income per common share:                      
Weighted average common shares outstanding, Basic (in shares)                 12,567,000 12,434,000 12,324,000
Denominator for diluted net income per share:                      
Weighted average common shares outstanding, Basic (in shares)                 12,567,000 12,434,000 12,324,000
Dilutive effect of stock options and restricted shares (in shares)                 226,000 287,000 226,000
Weighted average common shares outstanding, Diluted (in shares)                 12,793,000 12,721,000 12,550,000
Earnings per common share:                      
Earnings per share - Basic (in dollars per share) $ 0.26 $ 0.20 $ 0.05 $ 0.30 $ 0.32 $ 0.31 $ 0.27 $ 0.23 $ 0.81 $ 1.14 $ 1.17
Earnings per share - Diluted (in dollars per share) $ 0.26 $ 0.20 $ 0.05 $ 0.29 $ 0.32 $ 0.30 $ 0.27 $ 0.23 $ 0.79 $ 1.11 $ 1.15
Stock Options                      
Earnings per common share:                      
Anti-dilutive securities                 107,500 55,000 0
Range of exercise prices, lower limit                 $ 22.90 $ 30.41  
Range of exercise prices, upper limit                 $ 33.36 $ 33.36