Stock Based Compensation Plan (Details) (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, Beginning of Period, in shares	451,233
Granted, in shares	10,200
Stock Options Exercised, in shares	(45,742)	(66,498)
Forfeited, in shares	(12,429)
Outstanding, End of Period, in shares	403,262
Exercisable at Period End, in shares	284,622
Vested and Expected to Vest, in shares	403,262
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	$ 22.61
Granted, in dollars per share	$ 23.80
Excercised, in dollars per share	$ 21.10
Forfeited, in dollars per share	$ 22.50
Outstanding, End of Period, in dollars per share	$ 22.82
Exercisable at Period End, in dollars per share	$ 22.22
Vested and Expected to Vest, in dollars per share	$ 22.82
Fair Value, in dollars per share	$ 5.46
Dividend Yield	4.20%
Expected Volatility	36.57%
Risk Free Interest Rate	1.31%
Expected Lives, in years	6 years 8 months 16 days