Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Assumptions Used To Determine Fair Value of Stock Options

The following assumptions were used to determine the fair value of stock options as of the grant date to determine compensation expense for the years ended December 31, 2018, 2017, and 2016:

Stock Options:	2018			2017			2016
Grant date fair value		$7.69			$6.70			$6.31
Expected life of options	8 years			8 years			8 years
Risk-free interest rate	3.01		%	2.29		%	2.15		%
Dividend yield rate	2.91		%	2.64		%	2.85		%
Price volatility	23.47		%	23.43		%	27.37		%

Stock Options Activity

The following table summarizes stock option activity during 2018: 

	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life, in Years
Outstanding at January 1, 2018	143,445			$26.79
Granted	22,384		37.06
Forfeited	—		—
Exercised	(17,764	)	21.82
Outstanding at December 31, 2018	148,065			$28.94	6.09

Restricted Stock Unit Activity

The following table summarizes restricted stock unit activity during 2018:

	Number of Shares		Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Life, in Years
Outstanding at January 1, 2018	65,883			$30.10
Granted	26,163		37.06
Vested	(17,664	)	28.76
Forfeited	—		—
Outstanding at December 31, 2018	74,382			$32.87	1.90