Goodwill And Other Intangible Assets (Schedule Of Intangible Assets With Estimable Useful Lives) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 43,468	$ 41,609
Accumulated Amortization	(33,925)	(32,815)
Valuation Allowance	(404)	0
Net Amount	9,139	8,794
Core Deposit Premium [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	31,270	31,270
Accumulated Amortization	(29,366)	(28,954)
Valuation Allowance	0	0
Net Amount	1,904	2,316
Mortgage Servicing Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	12,198	10,339
Accumulated Amortization	(4,559)	(3,861)
Valuation Allowance	(404)	0
Net Amount	$ 7,235	$ 6,478