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Allowance For Loan Losses (Schedule of Non-Commercial Loans By Payment Performance) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, Total | $ 3,127,410 | $ 3,046,226
Residential real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, Total | 1,468,278 | 1,451,462
Home equity |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, Total | 139,499 | 141,965
Consumer Loan |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, Total | 29,162 | 32,545
DDA Overdrafts |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, Total | 4,411 | 5,071
Non-commercial Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, Total | 1,641,350 | 1,631,043
Performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, Total | 1,638,257 | 1,626,537
Performing | Residential real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, Total | 1,465,445 | 1,447,087
Performing | Home equity |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, Total | 139,239 | 141,834
Performing | Consumer Loan |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, Total | 29,162 | 32,545
Performing | DDA Overdrafts |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, Total | 4,411 | 5,071
Non-Performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, Total | 3,093 | 4,506
Non-Performing | Residential real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, Total | 2,833 | 4,375
Non-Performing | Home equity |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, Total | 260 | 131
Non-Performing | Consumer Loan |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, Total | 0 | 0
Non-Performing | DDA Overdrafts |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, Total | $ 0 | $ 0

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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