Stock Based Compensation (Tables)

12 Months Ended

Dec. 31, 2015

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, 2015, 2014, and 2013:

Stock Options:	2015			2014			2013
Grant date fair value		$7.01			$6.73			$5.59
Expected life of options	8 years			8 years			8 years
Risk-free interest rate	2.17		%	2.21		%	2.30		%
Dividend yield rate	2.64		%	2.64		%	2.90		%
Price volatility	28.63		%	28.93		%	28.89		%

Stock Options Activity

The following table summarizes stock option activity during 2015: 

	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life, in Years
Outstanding at January 1, 2015	179,990			$21.83
Granted	36,582		28.76
Forfeited	(602	)	22.30
Exercised	(16,223	)	22.80
Outstanding at December 31, 2015	199,747			$23.02	3.91

Restricted Stock Unit Activity

The following table summarizes restricted stock unit activity during 2015:

	Number of Shares		Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Life, in Years
Outstanding at January 1, 2015	59,486			$24.03
Granted	21,437		28.76
Vested	(17,936	)	20.35
Forfeited	—		—
Outstanding at December 31, 2015	62,987			$26.69	1.90