Employee Benefit Plans (Summary Of Stock Option Activity) (Details) (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options Outstanding, beginning balance	289,544	293,817
Options, Granted	15,475	16,876
Options, Exercised	(107,140)	(18,899)
Options, Forfeited	(2,250)	(1,500)
Options Outstanding, ending balance	195,629	290,294
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted-Average Exercise Price, Outstanding, beginning balance	$ 34.38	$ 33.95
Weighted-Average Exercise Price, Granted	$ 37.74	$ 35.39
Weighted-Average Exercise Price, Exercised	$ 33.36	$ 28.78
Weighted-Average Exercise Price, Forfeited	$ 34.73	$ 34.73
Weighted-Average Exercise Price, Outstanding, ending balance	$ 35.19	$ 34.37