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Employee Benefit Plans (Summary Of Assets Segregated By Level Of Valuation Inputs Within The Fair Value Hierarchy) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | $ 12,629 | $ 11,884 | $ 12,041
Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 10,247 | 6,866 |
Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 2,382 | 5,018 |
Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 146 | 79 |
Cash and Cash Equivalents | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 146 | 79 |
Cash and Cash Equivalents | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Cash and Cash Equivalents | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
US Government Agencies Debt Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 100 |  |
US Government Agencies Debt Securities | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 |  |
US Government Agencies Debt Securities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 100 |  |
US Government Agencies Debt Securities | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  |  |
Common stocks |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 10,101 | 6,787 |
Common stocks | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 10,101 | 6,787 |
Common stocks | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Common stocks | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Corporate Bond Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 2,282 | 5,018 |
Corporate Bond Securities | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Corporate Bond Securities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 2,282 | 5,018 |
Corporate Bond Securities | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | $ 0 | $ 0 |

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