Goodwill And Other Intangible Assets (Schedule Of Intangible Assets With Estimable Useful Lives) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 41,609	$ 39,176
Accumulated Amortization	(32,815)	(31,549)
Valuation Allowance	0	(9)
Net Amount	8,794	7,618
Core Deposit Premium [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	31,270	31,270
Accumulated Amortization	(28,954)	(28,305)
Valuation Allowance	0	0
Net Amount	2,316	2,965
Mortgage Servicing Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	10,339	7,906
Accumulated Amortization	(3,861)	(3,244)
Valuation Allowance	0	(9)
Net Amount	$ 6,478	$ 4,653