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Employee Benefit Plans (Summary Of Stock Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Options |  |  |  |
Options Outstanding, beginning balance | 46,251 | 57,972 | 87,605 |
Options, Granted | 0 | 0 | 0 |
Options, Exercised | (4,921) | (11,721) | (29,633) |
Options, Forfeited | 0 | 0 | 0 |
Options Outstanding, ending balance | 41,330 | 46,251 | 57,972 |
Weighted-Average Exercise Price |  |  |  |
Weighted-Average Exercise Price, Outstanding, beginning balance | $ 52.74 | $ 51.15 | $ 47.15 |
Weighted-Average Exercise Price, Granted | 0 | 0 | 0 |
Weighted-Average Exercise Price, Exercised | 45.17 | 44.87 | 39.31 |
Weighted-Average Exercise Price, Forfeited | 0 | 0 | 0 |
Weighted-Average Exercise Price, Outstanding, ending balance | $ 53.64 | $ 52.74 | $ 51.15 |
Options, Exercisable at end of year | 21,459 | 8,063 | 2,697 |
Weighted-Average Exercise Price, Exercisable at end of year | $ 50.45 | $ 44.48 | $ 45.13 |
Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares | 19,871 | 38,188 | 55,275 | 79,718
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 | 18,317 | 17,087 | 24,443 |
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 | $ 56.97 | $ 54.42 | $ 51.40 | $ 48.08
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 | 51.66 | 44.65 | 40.58 |
Weighted-Average Exercise Price, Forfeited during the year | $ 0 | $ 0 | $ 0 |
Proceeds from stock option exercises | $ 223 | $ 526 | $ 1,164 |
Intrinsic value of stock options exercised | 93 | 368 | 944 |
Stock-based compensation expense associated with stock options | 60 | 119 | 178 |
Income tax benefit recognized related to stock-based compensation | 5 | $ 12 | $ 19 |
Unrecognized stock-based compensation expense | $ 24 |  |  |
Weighted average period in which the above amount is expected to be recognized | 10 months 24 days |  |  |

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- Definition Net number of share options (or share units) granted during the period. + 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)(1) -URI http://asc.fasb.org/extlink&oid=120381028&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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