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Investments In Securities and Fair Value (Schedule Of Unrealized Losses On Investments) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Special revenue issuer obligations of U.S. states, territories and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total temporarily impaired securities, Less than 12 Months, Fair Value | $ 0 | $ 0
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses | 0 | 0
Total temporarily impaired securities, 12 Months or Longer, Fair Value | 1,102 | 1,103
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (3) | (3)
Total temporarily impaired securities, Total Fair Value | 1,102 | 1,103
Total temporarily impaired securities, Unrealized Losses | (3) | (3)
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total temporarily impaired securities, Less than 12 Months, Fair Value | 20,005 | 20,630
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses | (38) | (24)
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 | 20,005 | 20,630
Total temporarily impaired securities, Unrealized Losses | (38) | (24)
Total temporarily impaired securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total temporarily impaired securities, Less than 12 Months, Fair Value | 20,005 | 20,630
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses | (38) | (24)
Total temporarily impaired securities, 12 Months or Longer, Fair Value | 1,102 | 1,103
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (3) | (3)
Total temporarily impaired securities, Total Fair Value | 21,107 | 21,733
Total temporarily impaired securities, Unrealized Losses | $ (41) | $ (27)

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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 No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 + Details
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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 less than twelve months. + References No definition available. + Details
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