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Employee Benefit Plans (Summary Of Stock Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |
Options, Exercised (in shares) | (2,650) | (5,638)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |
Proceeds from stock option exercises | $ 122 | $ 252
Employee Stock Option |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |
Options Outstanding, beginning balance (in shares) | 46,251 | 57,972
Options, Exercised (in shares) | (2,650) | (5,638)
Options Outstanding, ending balance (in shares) | 43,601 | 52,334
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |
Weighted-Average Exercise Price, Outstanding, beginning balance (in dollars per share) | $ 52.74 | $ 51.15
Weighted-Average Exercise Price, Exercised (in dollars per share) | 46.06 | 44.74
Weighted-Average Exercise Price, Outstanding, ending balance (in dollars per share) | $ 53.15 | $ 51.84
Exercisable (shares) | 23,730 | 14,146
Exercisable, Weighted average exercise price (US$ per share) | $ 49.84 | $ 44.70
Proceeds from stock option exercises | $ 122 | $ 252
Intrinsic value of stock options exercised | 44 | 177
Stock-based compensation expense associated with stock options | 22 | $ 37
Unrecognized stock-based compensation expense associated with stock options | $ 63 |
Weighted average period (in years) in which the above amount is expected to be recognized | 1 year 4 months 24 days |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of cash inflow from exercise of option under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120381028&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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