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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Numerator:                      
Net income $ 1,160 $ 1,509 $ 1,259 $ 2,541 $ 3,277 $ 2,562 $ 614 $ 3,694 $ 6,469 $ 10,147 $ 14,128
Denominator for basic net income per common share:                      
Weighted average common shares outstanding, Basic (in shares)                 12,702,000 12,567,000 12,434,000
Denominator for diluted net income per share:                      
Weighted average common shares outstanding, Basic (in shares)                 12,702,000 12,567,000 12,434,000
Dilutive effect of stock options and restricted shares (in shares)                 233,000 226,000 287,000
Weighted average common shares outstanding, Diluted (in shares)                 12,935,000 12,793,000 12,721,000
Earnings per common share:                      
Earnings per share - Basic (in dollars per share) $ 0.09 $ 0.12 $ 0.10 $ 0.20 $ 0.26 $ 0.20 $ 0.05 $ 0.30 $ 0.51 $ 0.81 $ 1.14
Earnings per share - Diluted (in dollars per share) $ 0.09 $ 0.12 $ 0.10 $ 0.20 $ 0.26 $ 0.20 $ 0.05 $ 0.29 $ 0.50 $ 0.79 $ 1.11
Stock Options                      
Earnings per common share:                      
Anti-dilutive securities                 51,167 107,500 55,000
Range of exercise prices, lower limit                 $ 30.41 $ 22.90 $ 30.41
Range of exercise prices, upper limit                 $ 33.36 $ 33.36 $ 33.36