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Stock Based Compensation (Details) - Stock Options [Member]
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Number of options:  
Number of Options outstanding, beginning | shares 47,250
Options outstanding prior to stock dividend | shares 47,250
Options outstanding after 5% stock dividend | shares 49,613 [1]
Options exercised after stock dividend | shares (6,484)
Options granted after stock dividend | $ $ 15,000
Number of Options outstanding, ending | shares 58,129
Number of Options exercisable | shares 38,612
Weighted Average Exercise Price:  
Weighted Average Exercise Price of Options outstanding, beginning $ 22.32
Options outstanding prior to stock dividend 22.32
Options outstanding after 5% stock dividend 21.26 [1]
Options exercised after stock dividend 21.08
Options granted after stock dividend 25.65
Weighted Average Exercise Price of Options outstanding, ending 22.41
Weighted Average Exercise Price of Options exercisable $ 21.52
[1] The 2018 balance was adjusted for the 5% stock dividend paid on May 31, 2018.