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Allowance For Loan Losses (Schedule Of Aging Analysis Of Accruing And Non-Accruing Loans) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Threshold in Days 30 days    
Threshold Period Past Due for Write-off of Financing Receivable   30 days  
Current $ 2,879,624   $ 2,836,419
Financing Receivable, Acquired with Deteriorated Credit Quality, Recorded Investment, Past Due 516   506
Non-accrual 15,199   16,948
Gross loans $ 2,903,398   2,862,534
Residential Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Threshold Period Past Due for Write-off of Financing Receivable 120 days 120 days  
Current $ 1,409,116   1,373,604
Financing Receivable, Acquired with Deteriorated Credit Quality, Recorded Investment, Past Due 0   0
Non-accrual 2,531   2,918
Gross loans 1,417,137   1,383,133
Home equity - junior lien [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 142,067   146,493
Financing Receivable, Acquired with Deteriorated Credit Quality, Recorded Investment, Past Due 0   0
Non-accrual 165   136
Gross loans 142,827   147,036
Commercial And Industrial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 168,334   162,435
Financing Receivable, Acquired with Deteriorated Credit Quality, Recorded Investment, Past Due 0   0
Non-accrual 2,724   2,745
Gross loans 171,362   165,340
Commercial Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 1,123,968   1,114,953
Financing Receivable, Acquired with Deteriorated Credit Quality, Recorded Investment, Past Due 516   506
Non-accrual 9,779   11,149
Gross loans $ 1,135,493   1,127,581
Consumer Loan [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Threshold Period Past Due for Write-off of Financing Receivable 180 days 180 days  
Current $ 33,649   35,886
Financing Receivable, Acquired with Deteriorated Credit Quality, Recorded Investment, Past Due 0   0
Non-accrual 0   0
Gross loans 33,799   36,083
Demand Deposit Account Overdrafts [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 2,490   3,048
Financing Receivable, Acquired with Deteriorated Credit Quality, Recorded Investment, Past Due 0   0
Non-accrual 0   0
Gross loans $ 2,780   3,361
Commercial Industrial Loans And Commercial Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Threshold Period Past Due for Write-off of Financing Receivable 120 days 120 days  
Gross loans $ 1,306,855   1,292,921
Financing Receivables, 30 to 59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 6,959   6,946
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 4,680   5,261
Financing Receivables, 30 to 59 Days Past Due [Member] | Home equity - junior lien [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 410   318
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial And Industrial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 290   141
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 1,230   762
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Loan [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 59   154
Financing Receivables, 30 to 59 Days Past Due [Member] | Demand Deposit Account Overdrafts [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 290   310
Financing Receivables, 60 to 89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 859   1,220
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 707   932
Financing Receivables, 60 to 89 Days Past Due [Member] | Home equity - junior lien [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 135   65
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial And Industrial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 14   0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 0   211
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Loan [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 3   9
Financing Receivables, 60 to 89 Days Past Due [Member] | Demand Deposit Account Overdrafts [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 0   3
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 241   495
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 103   418
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Home equity - junior lien [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 50   24
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial And Industrial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 0   19
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 0   0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Loan [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 88   34
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Demand Deposit Account Overdrafts [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due $ 0   $ 0