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Employee Benefit Plans (Summary Of Stock Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |
Options, Exercised (in shares) | (755) | (3,581) | (4,921) | (11,721)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |  |  |
Proceeds from stock option exercises |  |  | $ 223 | $ 526
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) |  |  | (4,921) | (11,721)
Options Outstanding, ending balance (in shares) | 41,330 | 46,251 | 41,330 | 46,251
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) |  |  | 45.17 | 44.87
Weighted-Average Exercise Price, Outstanding, ending balance (in dollars per share) | $ 53.64 | $ 52.74 | $ 53.64 | $ 52.74
Exercisable (shares) | 21,459 | 8,063 | 21,459 | 8,063
Exercisable, Weighted average exercise price (US$ per share) | $ 50.45 | $ 44.48 | $ 50.45 | $ 44.48
Proceeds from stock option exercises |  |  | $ 223 | $ 526
Intrinsic value of stock options exercised |  |  | 93 | 368
Stock-based compensation expense associated with stock options |  |  | 47 | $ 92
Unrecognized stock-based compensation expense associated with stock options | $ 37 |  | $ 37 |
Weighted average period (in years) in which the above amount is expected to be recognized |  |  | 1 year |

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- Definition Amount of cost to be recognized for 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 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 The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + 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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