Benefit Plans (Summary Of Performance Unit Activity) (Details) (Performance Units [Member], USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Performance Units [Member]
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)	(311)	(1,013)
Nonvested, March 31 (in shares/awards)	65,272	66,397
Vested percentage of the target	147.50%	197.50%
Aggregate payout value	$ 1.2	$ 1.3