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Summary Of Significant Accounting Policies (Narrative) (Details) shares in Thousands | 12 Months Ended
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Dec. 31, 2016 store item shares | Dec. 31, 2015 shares | Dec. 31, 2014 shares
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of banking offices | store | 14 |  |
Loan returned to accrual status period | 6 months |  |
Number of reporting units | item | 1 |  |
Total anti-dilutive stock options, in shares | shares | 60 | 86 | 43
Residential Real Estate And Home Equity Loans [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Loan non-accrual status period | 90 days |  |
Consumer Loans [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Loan non-accrual status period | 90 days |  |
Loan charged-off period | 120 days |  |
Commercial Real Estate And Commercial Business Loans [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Loan non-accrual status period | 90 days |  |
Minimum [Member] | Land and Building [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment, useful life | 25 years |  |
Minimum [Member] | Furniture And Equipment [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment, useful life | 3 years |  |
Maximum [Member] | Land and Building [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment, useful life | 40 years |  |
Maximum [Member] | Furniture And Equipment [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment, useful life | 7 years |  |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Reporting Unit -URI http://asc.fasb.org/extlink&oid=6523643 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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