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Stock Based Compensation (Schedule Of Share-based Compensation, Stock Options, Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares available for fututre grants | 293,090 |  |
ESPP [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Balance Outstanding | 19,111 | 18,378 |
Granted | 32,209 | 19,644 |
Exercised | (753) | (2,270) |
Expired | (20,882) | (16,641) |
Balance Outstanding | 29,685 | 19,111 |
Weighted Average Price Per Share: Balance Outstanding | $ 36.21 | $ 32.73 |
Weighted Average Price Per Share: Granted | 24.19 | 36.21 |
Weighted Average Price Per Share: Exercised | 25.32 | 32.75 |
Weighted Average Price Per Share: Expired | 35.15 | 32.84 |
Weighted Average Price Per Share: Balance Outstanding | $ 24.19 | $ 36.21 |
Aggregate Intrinsic Value | $ 84 | $ 47 |
Number of shares available for fututre grants | 181,954 |  |
ISOP [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Balance Outstanding | 92,979 | 104,011 |
Granted |  |  |
Exercised | (625) | (8,482) |
Forfeited |  | (2,550) |
Balance Outstanding | 92,354 | 92,979 |
Weighted Average Price Per Share: Balance Outstanding | $ 28.55 | $ 28.22 |
Weighted Average Price Per Share: Granted |  |  |
Weighted Average Price Per Share: Exercised |  | 22.82 |
Weighted Average Price Per Share: Expired | 27.62 |  |
Weighted Average Price Per Share: Forfeited |  | 34.10 |
Weighted Average Price Per Share: Balance Outstanding | $ 28.55 | $ 28.55 |
Aggregate Intrinsic Value |  | $ 943 | $ 341
Restricted Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Balance Outstanding |  |  |
Granted | 14,921 |  |
Vested | (398) |  |
Forfeited | (990) |  |
Balance Outstanding | 13,533 |  |
Weighted Average Price Per Share: Balance Outstanding |  |  |
Weighted Average Price Per Share: Granted | 31.02 |  |
Weighted Average Price Per Share: Vested | 31.02 |  |
Weighted Average Price Per Share: Forfeited | 31.02 |  |
Weighted Average Price Per Share: Balance Outstanding | $ 31.02 |  |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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