Goodwill And Other Intangible Assets (Schedule Of Intangible Assets With Estimable Useful Lives) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 37,274	$ 36,942
Accumulated Amortization	(30,559)	(30,211)
Valuation Allowance	(15)	(22)
Net Amount	6,700	6,709
Core Deposit Premium [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	31,270	31,270
Accumulated Amortization	(27,676)	(27,429)
Valuation Allowance	0	0
Net Amount	3,594	3,841
Mortgage Servicing Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	6,004	5,672
Accumulated Amortization	(2,883)	(2,782)
Valuation Allowance	(15)	(22)
Net Amount	$ 3,106	$ 2,868