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Investments In Securities (Schedule Of Unrealized Losses On Investments) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Government obligations |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total temporarily impaired securities, Less than 12 Months, Fair Value | $ 1,023 | $ 1,042
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses | (10) | (1)
Total temporarily impaired securities, 12 Months or Longer, Fair Value | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Total temporarily impaired securities, Total Fair Value | 1,023 | 1,042
Total temporarily impaired securities, Unrealized Losses | (10) | (1)
General Obligations Us States And Political Subdivisions Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total temporarily impaired securities, Less than 12 Months, Fair Value | 8,062 | 4,560
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses | (96) | (27)
Total temporarily impaired securities, 12 Months or Longer, Fair Value | 3,402 | 3,535
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (136) | (23)
Total temporarily impaired securities, Total Fair Value | 11,464 | 8,095
Total temporarily impaired securities, Unrealized Losses | (232) | (50)
Issuer Obligations Us States And Political Subdivisions Debt Securities Special Revenues [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total temporarily impaired securities, Less than 12 Months, Fair Value | 18,139 | 13,551
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses | (190) | (61)
Total temporarily impaired securities, 12 Months or Longer, Fair Value | 3,899 | 4,023
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (199) | (104)
Total temporarily impaired securities, Total Fair Value | 22,038 | 17,574
Total temporarily impaired securities, Unrealized Losses | (389) | (165)
Corporate Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total temporarily impaired securities, Less than 12 Months, Fair Value | 10,696 | 3,744
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses | (76) | (7)
Total temporarily impaired securities, 12 Months or Longer, Fair Value | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Total temporarily impaired securities, Total Fair Value | 10,696 | 3,744
Total temporarily impaired securities, Unrealized Losses | (76) | (7)
Total Fixed Income Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total temporarily impaired securities, Less than 12 Months, Fair Value | 37,920 | 22,897
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses | (372) | (96)
Total temporarily impaired securities, 12 Months or Longer, Fair Value | 7,301 | 7,558
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (335) | (127)
Total temporarily impaired securities, Total Fair Value | 45,221 | 30,455
Total temporarily impaired securities, Unrealized Losses | $ (707) | $ (223)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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