Employee Benefit Plans (Summary Of Stock Option Activity) (Details) - $ / shares	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options Outstanding, beginning balance (in shares)	167,554	173,601
Options, Granted (in shares)	12,961	13,953
Options, Exercised (in shares)	(71,750)	(19,000)
Options, Forfeited (in shares)	(4,000)	0
Options Outstanding, ending balance (in shares)	104,765	168,554
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted-Average Exercise Price, Outstanding, beginning balance (in dollars per share)	$ 36.74	$ 35.26
Weighted-Average Exercise Price, Granted (in dollars per share)	46.41	44.43
Weighted-Average Exercise Price, Exercised (in dollars per share)	37.01	29.13
Weighted-Average Exercise Price, Forfeited (in dollars per share)	31.66	0.00
Weighted-Average Exercise Price, Outstanding, ending balance (in dollars per share)	$ 37.95	$ 36.71