Goodwill And Other Intangible Assets (Schedule Of Intangible Assets With Estimable Useful Lives) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 36,942	$ 35,908
Accumulated Amortization	(30,211)	(29,210)
Valuation Allowance	(22)	(29)
Net Amount	6,709	6,669
Core Deposit Premium [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	31,270	31,270
Accumulated Amortization	(27,429)	(26,239)
Valuation Allowance	0	0
Net Amount	3,841	5,031
Mortgage Servicing Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	5,672	4,638
Accumulated Amortization	(2,782)	(2,971)
Valuation Allowance	(22)	(29)
Net Amount	$ 2,868	$ 1,638