Benefit Plans (Summary Of Performance Unit Activity) (Details) (Performance Units [Member], USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Nonvested, January 1 (in shares/awards)	65,912	64,969
Granted (in shares/awards)	20,422	22,201
Vested (in shares/awards)	(20,751)	(19,760)
Forfeited (in shares/awards)	(958)	(1,498)
Nonvested, September 30 (in shares/awards)	64,625	65,912
2011 Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Vested (in shares/awards)	(20,751)
Vested percentage of the target	147.50%
Aggregate payout value	$ 1.2
2010 Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Vested (in shares/awards)		(19,760)
Vested percentage of the target		197.50%
Aggregate payout value		$ 1.3