Goodwill And Other Intangible Assets (Summary Of Core Deposit Intangibles) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Gross carrying amount				$ 9,802	$ 9,802
Accumulated amortization				(7,403)	(6,863)
Total	$ 2,939	$ 3,536	$ 3,536	$ 2,399	$ 2,939
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	2,939	3,536
Amortization expense	(540)	(597)	(700)
Ending balance	$ 2,399	$ 2,939	$ 3,536