Employee Benefits (Summary Of Activity In Stock Option Plans) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Options / SARs
Outstanding Options, Granted			0
Outstanding Options, Exercised	(6,800)	(36,925)	(24,740)
Employee Stock Option and Stock Appreciation Rights (SARs) [Member]
Options / SARs
Outstanding Options, Beginning Balance	250,291	217,857	244,147
Outstanding Options, Granted	0	87,615	0
Outstanding Options, Exercised	(6,800)	(51,781)	(24,740)
Outstanding Options, Forfeited	(3,200)	0	0
Outstanding Options, Expired	(8,200)	(3,400)	(1,550)
Outstanding Options, Ending Balance	232,091	250,291	217,857
Exercise Price
Outstanding, Weighted-Average Exercise Price, Beginning Balance	$ 17.75	$ 13.56	$ 14.05
Outstanding, Weighted-Average Exercise Price, Granted	0.00	26.01	0.00
Outstanding, Weighted-Average Exercise Price, Exercised	17.79	13.62	18.08
Outstanding, Weighted-Average Exercise Price, Forfeited	25.50	0.00	0.00
Outstanding, Weighted-Average Exercise Price, Expired	25.54	24.97	18.79
Outstanding, Weighted-Average Exercise Price, Ending Balance	$ 17.36	$ 17.75	$ 13.56
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 1,070
Options Outstanding, Wted. Avg. Remaining Contractual Life (yrs)	6 years 8 months 27 days
Exercisable Options, Ending Balance	95,924	62,646	84,483
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 583	$ 687	$ 974
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Remaining Contractual Term	6 years 15 days	4 years 11 months 1 day	4 years 8 months 23 days
Exercisable Options, Weighted-Average Exercise Price, Ending Balance	$ 14.82	$ 15.35	$ 16.00