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Employee Benefit Plans (Schedule Of Asset Allocation and Fair Value Of Plan Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | 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 | $ 6,136 | $ 7,110 | $ 6,702
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 2,543 | 1,537 |
Significant Other Observable Inputs (Level 2) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 2,992 | 5,318 |
Significant Unobservable Inputs (Level 3) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | $ 601 | $ 255 | $ 283
Cash And Cash Equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Target Plan Asset Allocations | 4.20% | 6.40% |
Cash (Including Foreign Currencies) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | $ 6 | $ 70 |
Cash (Including Foreign Currencies) [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | $ 6 | 70 |
Short-term Investment Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets |  | 19 |
Short-term Investment Funds [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets |  | $ 19 |
Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Target Plan Asset Allocations | 46.10% | 50.20% |
Common Stock [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | $ 2,475 | $ 1,401 |
Common Stock [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 2,475 | 1,401 |
Depository Receipts [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 42 | 35 |
Depository Receipts [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 42 | 35 |
Commingled Pension Trust Fund [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets |  | 2,203 |
Commingled Pension Trust Fund [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets |  | 2,203 |
Preferred Stock [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 20 | 31 |
Preferred Stock [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | $ 20 | $ 31 |
Fixed Income Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Target Plan Asset Allocations | 45.80% | 40.20% |
Corporate Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | $ 608 | $ 296 |
Corporate Bonds [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 608 | 296 |
Government Issue [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 2,228 | 992 |
Government Issue [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 2,228 | 992 |
Mortgage Backed Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets |  | 6 |
Mortgage Backed Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets |  | 6 |
Collateralized Mortgage Obligations [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 156 | 56 |
Collateralized Mortgage Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | $ 156 | 56 |
Commingled Pension Trust Fund [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets |  | 1,746 |
Commingled Pension Trust Fund [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets |  | $ 1,746 |
Other Investments [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Target Plan Asset Allocations | 3.90% | 3.20% |
Total assets | $ 601 | $ 255 |
Other Investments [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | $ 601 | $ 255 |

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