Goodwill And Other Intangible Assets (Schedule Of Intangible Assets With Estimable Useful Lives) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 44,435	$ 44,212
Accumulated Amortization	(34,619)	(34,351)
Valuation Allowance	(1,383)	(327)
Net Amount	8,433	9,534
Core Deposit Premium [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	31,270	31,270
Accumulated Amortization	(29,605)	(29,485)
Valuation Allowance	0	0
Net Amount	1,665	1,785
Mortgage Servicing Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	13,165	12,942
Accumulated Amortization	(5,014)	(4,866)
Valuation Allowance	(1,383)	(327)
Net Amount	$ 6,768	$ 7,749