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Employee Benefit Plans (Schedule Of Asset Allocation and Fair Value Of Plan Assets) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Target Plan Asset Allocations | 100.00% | 100.00%
Total assets | $ 7,110 | $ 6,702
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 1,537 | 1,483
Significant Other Observable Inputs (Level 2) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 5,318 | 4,936
Significant Unobservable Inputs (Level 3) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | $ 255 | $ 283
Cash And Cash Equivalents [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Target Plan Asset Allocations | 6.40% | 6.10%
Cash (Including Foreign Currencies) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | $ 70 | $ 11
Cash (Including Foreign Currencies) [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 70 | 11
Short-term Investment Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 19 | 33
Short-term Investment Funds [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | $ 19 | $ 33
Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Target Plan Asset Allocations | 50.20% | 47.90%
Common Stock [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | $ 1,401 | $ 1,430
Common Stock [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 1,401 | 1,430
Depository Receipts [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 35 | 42
Depository Receipts [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 35 | 42
Commingled Pension Trust Fund [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 2,203 | 1,680
Commingled Pension Trust Fund [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 2,203 | $ 1,680
Preferred Stock [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 31 |
Preferred Stock [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | $ 31 |
Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Target Plan Asset Allocations | 40.20% | 42.60%
Corporate Bonds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | $ 296 | $ 307
Corporate Bonds [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 296 | 307
Government Issue [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 992 | 1,112
Government Issue [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 992 | 1,112
Mortgage Backed Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 6 | 4
Mortgage Backed Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 6 | 4
Collateralized Mortgage Obligations [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 56 | 68
Collateralized Mortgage Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 56 | 68
Commingled Pension Trust Fund [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 1,746 | 1,732
Commingled Pension Trust Fund [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | $ 1,746 | $ 1,732
Other Investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Target Plan Asset Allocations | 3.20% | 3.40%
Total assets | $ 255 | $ 283
Other Investments [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | $ 255 | $ 283

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6749337 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6520858 + Details
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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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