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Employee Benefit Plans (Summary Of Stock Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Options |  |  |  |
Options Outstanding, beginning balance | 26,727 | 41,330 | 46,251 |
Options, Granted | 0 | 0 | 0 |
Exercise of stock options | (15,141) | (14,603) | (4,921) |
Options, Forfeited | 0 | 0 | 0 |
Options Outstanding, ending balance | 11,586 | 26,727 | 41,330 |
Weighted-Average Exercise Price |  |  |  |
Weighted-Average Exercise Price, Outstanding, beginning balance | $ 57.04 | $ 53.64 | $ 52.74 |
Weighted-Average Exercise Price, Granted | 0 | 0 | 0 |
Weighted-Average Exercise Price, Exercised | 52.61 | 47.43 | 45.17 |
Weighted-Average Exercise Price, Forfeited | 0 | 0 | 0 |
Weighted-Average Exercise Price, Outstanding, ending balance | $ 62.83 | $ 57.04 | $ 53.64 |
Options, Exercisable at end of year | 11,586 | 20,848 | 21,459 |
Weighted-Average Exercise Price, Exercisable at end of year | $ 62.83 | $ 54.42 | $ 50.45 |
Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares | 0 | 5,879 | 19,871 | 38,188
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 0 | 0 | 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares | 5,879 | 13,992 | 18,317 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Number of Shares | 0 | 0 | 0 |
Weighted-Average Exercise Price |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Option, Nonvested, Weighted Average Exercise Price | $ 0 | $ 66.32 | $ 56.97 | $ 54.42
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | 0 | 0 | 0 |
Weighted-Average Exercise Price, Vested during the year | 66.32 | 53.22 | 51.66 |
Weighted-Average Exercise Price, Forfeited during the year | $ 0 | $ 0 | $ 0 |
Proceeds from stock option exercises | $ 798 | $ 691 | $ 223 |
Intrinsic value of stock options exercised | 442 | 474 | 93 |
Stock-based compensation expense associated with stock options | 2 | 22 | 60 |
Income tax benefit recognized related to stock-based compensation | 0 | $ 2 | $ 5 |
Unrecognized stock-based compensation expense | $ 0 |  |  |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Amount of tax benefit for recognition of expense of award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(03) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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