Stock Option And Stock Award Plans (Summary Of Stock Options Outstanding) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Number of Options
Number of Options, Outstanding, Beginning Balance	3,108,741	3,125,944	2,827,438
Number of Options, Granted			388,822
Number of Options, Forfeited and Expired	(89,408)	(17,203)	(22,611)
Number of Options, Exercised			(67,705)
Number of Options, Outstanding, Ending Balance	3,019,333	3,108,741	3,125,944
Weighted Average
Weighted Average Option Exercise Price/Share, Outstanding, Beginning Balance	$ 13.81	$ 13.82	$ 13.55
Weighted Average Option Exercise Price/Share, Granted			16.37
Weighted Average Option Exercise Price/Share, Forfeited and Expired	19.60	15.33	18.14
Weighted Average Option Exercise Price/Share, Exercised			13.51
Weighted Average Option Exercise Price/Share, Outstanding, Ending Balance	13.64	13.81	13.82
Minimum
Option Exercise Price/Share Range
Exercise Price, Outstanding, Beginning Balance	10.75	10.75	10.75
Exercise Price, Granted			16.37
Exercise Price, Forfeited and Expired	13.78	14.47	14.47
Exercise Price, Exercised			10.75
Exercise Price, Outstanding, Ending Balance	10.75	10.75	10.75
Maximum
Option Exercise Price/Share Range
Exercise Price, Outstanding, Beginning Balance	22.49	22.49	22.49
Exercise Price, Granted			16.37
Exercise Price, Forfeited and Expired	19.64	19.64	19.64
Exercise Price, Exercised			17.29
Exercise Price, Outstanding, Ending Balance	$ 22.49	$ 22.49	$ 22.49