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Goodwill And Other Intangible Assets (Schedule Of Intangible Assets With Estimable Useful Lives) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 46,508 $ 44,212
Accumulated Amortization (36,798) (34,351)
Valuation allowance (2,103) (327)
Finite-Lived Intangible Assets, Net, Total 7,607 9,534
Core Deposit Premium [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 31,270 31,270
Accumulated Amortization (29,912) (29,485)
Valuation allowance 0 0
Finite-Lived Intangible Assets, Net, Total 1,358 1,785
Mortgage Servicing Rights    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 15,238 12,942
Accumulated Amortization (6,886) (4,866)
Valuation allowance (2,103) (327)
Finite-Lived Intangible Assets, Net, Total $ 6,249 $ 7,749