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Allowance For Loan Losses (Schedule Of Aging Analysis Of Accruing And Non-Accruing Loans) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | $ 3,056,585 | $ 3,024,215
Financing receivable, purchase-credit impaired | 250 | 0
Non-accrual | 11,418 | 13,701
Gross loans | 3,074,173 | 3,046,226
Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 1,438,109 | 1,441,086
Financing receivable, purchase-credit impaired | 0 | 0
Non-accrual | 2,810 | 4,302
Gross loans | 1,444,795 | 1,451,462
Home Equity [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 138,750 | 141,192
Financing receivable, purchase-credit impaired | 0 | 0
Non-accrual | 114 | 100
Gross loans | 139,165 | 141,965
Commercial And Industrial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 203,046 | 183,615
Financing receivable, purchase-credit impaired | 0 | 0
Non-accrual | 1,353 | 1,958
Gross loans | 205,011 | 185,667
Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 1,241,951 | 1,221,344
Financing receivable, purchase-credit impaired | 250 | 0
Non-accrual | 7,141 | 7,341
Gross loans | 1,250,106 | 1,229,516
Consumer Loan [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 32,006 | 32,506
Financing receivable, purchase-credit impaired | 0 | 0
Non-accrual | 0 | 0
Gross loans | 32,043 | 32,545
Demand Deposit Account Overdrafts [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 2,723 | 4,472
Financing receivable, purchase-credit impaired | 0 | 0
Non-accrual | 0 | 0
Gross loans | 3,053 | 5,071
Commercial Industrial Loans And Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Gross loans | 1,455,117 | 1,415,183
Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, recorded investment, past due | 4,808 | 7,067
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 | 3,455 | 5,364
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 | 205 | 423
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 | 562 | 94
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 | 239 | 553
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 | 28 | 38
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 | 319 | 595
Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, recorded investment, past due | 1,077 | 861
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 | 386 | 637
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 | 96 | 219
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 | 50 | 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 | 525 | 0
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 | 9 | 1
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 | 11 | 4
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 | 35 | 382
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 | 35 | 73
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 | 31
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 | 0
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 | 278
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 | 0
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

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