Stock Based Compensation Plan (Details) - $ / shares	9 Months Ended
Sep. 30, 2016	Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, Beginning of Period, in shares	421,751
Granted, in shares	56,650
Stock Options Exercised, in shares	(82,790)	(24,554)
Forfeited, in shares	(10,758)
Outstanding, End of Period, in shares	384,853
Exercisable at Period End, in shares	253,241
Vested and Expected to Vest, in shares	131,612
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding at Beginning of Period, in dollars per share	$ 21.93
Granted, in dollars per share	25.10
Excercised, in dollars per share	21.46
Forfeited, in dollars per share	23.97
Outstanding, End of Period, in dollars per share	22.44
Exercisable at Period End, in dollars per share	21.41
Vested and Expected to Vest, in dollars per share	24.44
Fair Value, in dollars per share	$ 5.60
Dividend Yield	3.88%
Expected Volatility	32.95%
Risk Free Interest Rate	1.80%
Expected Lives, in years	7 years 6 months 23 days

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.