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Allowance For Loan Losses (Schedule Of Non-Commercial Loans By Payment Performance) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]    
Total $ 3,582,571 $ 3,587,608
Residential real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 1,643,416 1,635,338
Residential real estate | Performing [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 1,640,496 1,630,892
Residential real estate | Non-Performing    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 2,920 4,446
Home equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 150,808 153,496
Home equity | Performing [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 150,298 153,334
Home equity | Non-Performing    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 510 162
Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 54,799 51,190
Consumer | Performing [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 54,799 51,188
Consumer | Non-Performing    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 0 2
DDA overdrafts    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 4,638 6,328
DDA overdrafts | Performing [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 4,638 6,322
DDA overdrafts | Non-Performing    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 0 6
Total    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 1,853,661 1,846,352
Total | Performing [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 1,850,231 1,841,736
Total | Non-Performing    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total $ 3,430 $ 4,616