Employee Benefits (Summary Of Activity In Stock Option Plans) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Options
Outstanding Options, Beginning Balance	157,170	185,410	249,700
Outstanding Options, Granted	166,717	0	0
Outstanding Options, Exercised	(6,560)	(10,160)	(17,800)
Outstanding Options, Forfeited	0	(6,500)	(1,750)
Outstanding Options, Expired	(73,180)	(11,580)	(44,740)
Outstanding Options, Ending Balance	244,147	157,170	185,410
Weighted- Average Exercise Price (WAEP)
Outstanding, Weighted-Average Exercise Price, Beginning Balance	$ 20.43	$ 19.59	$ 18.98
Outstanding, Weighted-Average Exercise Price, Granted	12.01	0.00	0.00
Outstanding, Weighted-Average Exercise Price, Exercised	7.87	6.98	5.37
Outstanding, Weighted-Average Exercise Price, Forfeited	0.00	24.44	19.69
Outstanding, Weighted-Average Exercise Price, Expired	23.67	16.64	21.83
Outstanding, Weighted-Average Exercise Price, Ending Balance	$ 14.05	$ 20.43	$ 19.59
Exercisable Options, Ending Balance	77,430	156,170	182,810
Exercisable Options, Weighted-Average Exercise Price, Ending Balance	$ 18.43	$ 20.54	$ 19.24