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Employee Benefit Plans (Schedule Of Asset Allocation and Fair Value Of Plan Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | $ 6,853 | $ 6,136 | $ 7,110
Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 3,141 | 2,543 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 3,412 | 2,992 |
Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets |  | 601 | $ 255
Cash (Including Foreign Currencies) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 6 | 6 |
Cash (Including Foreign Currencies) [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 6 | 6 |
Short-term Investment Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets |  | 0 |
Short-term Investment Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets |  | 0 |
Common Stock [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 3,066 | 2,475 |
Common Stock [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 3,066 | 2,475 |
Depository Receipts [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 47 | 42 |
Depository Receipts [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 47 | 42 |
Commingled Pension Trust Fund [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets |  | 0 |
Commingled Pension Trust Fund [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets |  | 0 |
Preferred Stock [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 22 | 20 |
Preferred Stock [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 22 | 20 |
Corporate Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 678 | 608 |
Corporate Bonds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 678 | 608 |
US Treasury and government agency bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 2,860 | 2,228 |
US Treasury and government agency bonds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 2,560 | 2,228 |
Mortgage Backed Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets |  | 0 |
Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets |  | 0 |
Collateralized Mortgage Obligations [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 174 | 156 |
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | $ 174 | 156 |
Commingled Pension Trust Fund [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets |  | 0 |
Commingled Pension Trust Fund [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets |  | 0 |
Other Investments [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets |  | 601 |
Other Investments [Member] | Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets |  | $ 601 |

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