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Allowance For Loan Losses (Schedule Of Aging Analysis Of Accruing And Non-Accruing Loans) (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | $ 2,934,352 | $ 2,836,419
Financing Receivable, Acquired with Deteriorated Credit Quality, Recorded Investment, Past Due | 526 | 506
Non-accrual | 14,591 | 16,948
Gross loans | 2,957,912 | 2,862,534
Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 1,435,610 | 1,373,604
Financing Receivable, Acquired with Deteriorated Credit Quality, Recorded Investment, Past Due | 0 | 0
Non-accrual | 3,919 | 2,918
Gross loans | 1,445,242 | 1,383,133
Home Equity [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 140,537 | 146,493
Financing Receivable, Acquired with Deteriorated Credit Quality, Recorded Investment, Past Due | 0 | 0
Non-accrual | 154 | 136
Gross loans | 141,616 | 147,036
Commercial And Industrial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 173,547 | 162,435
Financing Receivable, Acquired with Deteriorated Credit Quality, Recorded Investment, Past Due | 0 | 0
Non-accrual | 2,441 | 2,745
Gross loans | 176,387 | 165,340
Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 1,148,737 | 1,114,953
Financing Receivable, Acquired with Deteriorated Credit Quality, Recorded Investment, Past Due | 526 | 506
Non-accrual | 8,077 | 11,149
Gross loans | 1,158,088 | 1,127,581
Consumer Loan [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 33,510 | 35,886
Financing Receivable, Acquired with Deteriorated Credit Quality, Recorded Investment, Past Due | 0 | 0
Non-accrual | 0 | 0
Gross loans | 33,614 | 36,083
Demand Deposit Account Overdrafts [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 2,411 | 3,048
Financing Receivable, Acquired with Deteriorated Credit Quality, Recorded Investment, Past Due | 0 | 0
Non-accrual | 0 | 0
Gross loans | 2,965 | 3,361
Commercial Industrial Loans And Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Gross loans | 1,334,475 | 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 | 6,827 | 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 | 4,612 | 5,261
Financing Receivables, 30 to 59 Days Past Due [Member] | Home Equity [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Past Due | 889 | 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 | 291 | 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 | 668 | 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 | 91 | 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 | 276 | 310
Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Past Due | 1,047 | 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 | 886 | 932
Financing Receivables, 60 to 89 Days Past Due [Member] | Home Equity [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Past Due | 36 | 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 | 108 | 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 | 13 | 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 | 4 | 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 | 569 | 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 | 215 | 418
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Home Equity [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Past Due | 0 | 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 | 80 | 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 | 0 | 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 | $ 274 | $ 0

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