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Earnings per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Earnings per share:        
Net earnings [1],[2] $ 2,383 $ 2,326 $ 4,588 $ 4,719
Weighted average common shares outstanding - basic [3] 3,870,564 3,794,355 3,870,183 3,764,497
Assumed exercise of stock options [2],[3] 80,087 91,322 79,086 89,751
Weighted average common shares outstanding - diluted 3,950,651 3,885,677 3,949,269 3,854,248
Basic [1],[2],[3],[4] $ 0.62 $ 0.61 $ 1.19 $ 1.25
Diluted [1],[2],[3],[4] $ 0.60 $ 0.60 $ 1.16 $ 1.23
[1] Income tax expense, net earnings and earnings per share for the periods ended June 30, 2016 have been recast to reflect the early adoption of Accounting Standards Update ("ASU") 2016-09
[2] Net earnings, earnings per share and assumed exercise of stock options for the periods ended June 30, 2016 have been recast to reflect the early adoption of ASU 2016-09.
[3] Share and per share values for the periods ended June 30, 2016 have been adjusted to give effect to the 5% stock dividend paid during December 2016.
[4] Per share amounts for the periods ended June 30, 2016 have been adjusted to give effect to the 5% stock dividend paid during December 2016.