Employee Benefits (Summary Of Activity In Stock Option Plans) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Options / SARs
Outstanding Options, Beginning Balance	244,147	157,170	185,410
Outstanding Options, Granted	0	166,717	0
Outstanding Options, Exercised	(24,740)	(6,560)	(10,160)
Outstanding Options, Forfeited	0	0	(6,500)
Outstanding Options, Expired	(1,550)	(73,180)	(11,580)
Outstanding Options, Ending Balance	217,857	244,147	157,170
Exercise Price
Outstanding, Weighted-Average Exercise Price, Beginning Balance	$ 14.05	$ 20.43	$ 19.59
Outstanding, Weighted-Average Exercise Price, Granted	0.00	12.01	0.00
Outstanding, Weighted-Average Exercise Price, Exercised	18.08	7.87	6.98
Outstanding, Weighted-Average Exercise Price, Forfeited	0.00	0.00	24.44
Outstanding, Weighted-Average Exercise Price, Expired	18.79	23.67	16.64
Outstanding, Weighted-Average Exercise Price, Ending Balance	$ 13.56	$ 14.05	$ 20.43
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 3,044
Options Outstanding, Wted. Avg. Remaining Contractual Life (yrs)	6 years 11 months 1 day
Exercisable Options, Ending Balance	84,483	77,430	156,170
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 974	$ 103	$ 124
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Remaining Contractual Term	4 years 8 months 23 days	2 years 7 months 13 days	2 years 2 months 12 days
Exercisable Options, Weighted-Average Exercise Price, Ending Balance	$ 16.00	$ 18.43	$ 20.54