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Employee Benefit Plans (Summary Of Stock Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Options |  |  |  |
Options Outstanding, beginning balance | 87,605 | 86,613 | 95,015 |
Options, Granted | 0 | 17,631 | 24,348 |
Options, Exercised | (29,633) | (16,639) | (32,750) |
Options, Forfeited | 0 | 0 | 0 |
Options Outstanding, ending balance | 57,972 | 87,605 | 86,613 |
Weighted-Average Exercise Price |  |  |  |
Weighted-Average Exercise Price, Outstanding, beginning balance | $ 47.15 | $ 41.08 | $ 38.38 |
Weighted-Average Exercise Price, Granted | 0.00 | 66.32 | 43.73 |
Weighted-Average Exercise Price, Exercised | (39.31) | (35.91) | (35.28) |
Weighted-Average Exercise Price, Forfeited | 0.00 | 0.00 | 0.00 |
Weighted-Average Exercise Price, Outstanding, ending balance | $ 51.15 | $ 47.15 | $ 41.08 |
Options, Exercisable at end of year | 2,697 | 7,887 | 3,000 |
Weighted-Average Exercise Price, Exercisable at end of year | $ 45.13 | $ 37.37 | $ 29.45 |
Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares | 55,275 | 79,718 | 83,613 | 75,265
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 0 | 17,631 | 24,348 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares | 24,443 | 21,526 | 16,000 |
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 | $ 51.40 | $ 48.08 | $ 41.47 | $ 39.38
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | 0.00 | 66.32 | 43.73 |
Weighted-Average Exercise Price, Vested during the year | 40.58 | 37.31 | 35.09 |
Weighted-Average Exercise Price, Forfeited during the year | $ 0.00 | $ 0.00 | $ 0 |
Proceeds from stock option exercises | $ 1,164 | $ 597 | $ 1,155 |
Intrinsic value of stock options exercised | 944 | 481 | 551 |
Stock-based compensation expense associated with stock options | 178 | 246 | 240 |
Income tax benefit recognized related to stock-based compensation | 19 | $ 42 | $ 36 |
Unrecognized stock-based compensation expense | $ 204 |  |  |
Weighted average period in which the above amount is expected to be recognized | 2 years |  |  |

X
- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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=109197908&loc=d3e5070-113901 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income 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 (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&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://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)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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=109197908&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=109197908&loc=d3e5070-113901 + Details
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