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Stock-Based Compensation (Details 1) - Stock Options [Member] - $ / shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Summary of the status of the stock option plan and changes      
Shares Outstanding at beginning of year 642,203 693,954 667,479
Shares Granted 110,950 109,500 93,511
Shares Exercised (74,437) (152,751) (67,036)
Shares Forfeited or expired (15,875) (8,500)
Shares Outstanding at end of year 662,841 642,203 693,954
Shares Options exercisable at year-end 419,766 399,256 457,895
Shares available for grant 359,690 454,765 155,767
Weighted average exercise price Outstanding at beginning of year $ 11.77 $ 8.94 $ 7.83
Weighted average exercise price Granted 35.34 23.65 17.15
Weighted average exercise price Exercised 9.48 7.19 9.36
Weighted average exercise price Forfeited or expired 23.49 15.69
Weighted average exercise price Outstanding at end of year 15.70 11.77 8.94
Weighted average exercise price, Options exercisable at year-end 9.20 7.62 6.74
Weighted average fair value of options granted during the year $ 14.14 $ 10.96 $ 9.09
Weighted Average Remaining Contractual Life, Outstanding at end of year 5 years 7 months 6 days 5 years 10 months 24 days 6 years
Weighted Average Remaining Contractual Life, Options exercisable at year-end 4 years 1 month 6 days 4 years 4 months 24 days 4 years 10 months 25 days