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Loans (Recorded Investment By Loan Class In Current And Nonaccrual Loans) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | $ 5,893 | $ 4,878 |
Nonaccrual | 6,317 | 8,432 |
Current | 2,292,861 | 2,039,290 |
Total loans | 2,305,071 | 2,052,600 | $ 1,881,071
30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 5,128 | 3,384 |
60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 756 | 1,486 |
Greater than 90 Days [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 9 | 8 |
Commercial Business [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 1,337 | 933 |
Nonaccrual | 2,151 | 3,922 |
Current | 345,591 | 308,620 |
Total loans | 349,079 | 313,475 | 267,377
Commercial Business [Member] | 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 1,337 | 321 |
Commercial Business [Member] | 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans |  | 612 |
Commercial Mortgage [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 48 | 214 |
Nonaccrual | 1,025 | 947 |
Current | 670,479 | 566,320 |
Total loans | 671,552 | 567,481 | 476,407
Commercial Mortgage [Member] | 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 48 | 68 |
Commercial Mortgage [Member] | 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans |  | 146 |
Residential Real Estate Loans [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 1,326 | 1,118 |
Nonaccrual | 1,236 | 1,848 |
Current | 418,914 | 373,057 |
Total loans | 421,476 | 376,023 | 352,782
Residential Real Estate Loans [Member] | 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 1,073 | 723 |
Residential Real Estate Loans [Member] | 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 253 | 395 |
Residential Real Estate Lines [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 216 | 233 |
Nonaccrual | 372 | 235 |
Current | 119,157 | 124,298 |
Total loans | 119,745 | 124,766 | 127,233
Residential Real Estate Lines [Member] | 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 216 | 199 |
Residential Real Estate Lines [Member] | 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans |  | 34 |
Consumer Indirect [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 2,808 | 2,261 |
Nonaccrual | 1,526 | 1,467 |
Current | 721,420 | 648,766 |
Total loans | 725,754 | 652,494 | 636,357
Consumer Indirect [Member] | 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 2,320 | 1,975 |
Consumer Indirect [Member] | 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 488 | 286 |
Other Consumer [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 158 | 119 |
Nonaccrual | 7 | 13 |
Current | 17,300 | 18,229 |
Total loans | 17,465 | 18,361 | $ 20,915
Other Consumer [Member] | 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 134 | 98 |
Other Consumer [Member] | 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 15 | 13 |
Other Consumer [Member] | Greater than 90 Days [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | $ 9 | $ 8 |

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