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Investments In Securities and Fair Value (Schedule Of Unrealized Losses On Investments) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Government obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total temporarily impaired securities, Less than 12 Months, Fair Value |  | $ 12,045
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses |  | (4)
Total temporarily impaired securities, 12 Months or Longer, Fair Value |  | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 0
Total temporarily impaired securities, Total Fair Value |  | 12,045
Total temporarily impaired securities, Unrealized Losses |  | (4)
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 | $ 1,573 | 1,101
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses | (10) | (17)
Total temporarily impaired securities, 12 Months or Longer, Fair Value | 1,114 | 1,118
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (2) | (3)
Total temporarily impaired securities, Total Fair Value | 2,687 | 2,219
Total temporarily impaired securities, Unrealized Losses | (12) | (20)
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total temporarily impaired securities, Less than 12 Months, Fair Value | 640 | 413
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses | (33) | (5)
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 | 640 | 413
Total temporarily impaired securities, Unrealized Losses | (33) | (5)
Total temporarily impaired securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total temporarily impaired securities, Less than 12 Months, Fair Value | 2,213 | 13,559
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses | (43) | (26)
Total temporarily impaired securities, 12 Months or Longer, Fair Value | 1,114 | 1,118
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (2) | (3)
Total temporarily impaired securities, Total Fair Value | 3,327 | 14,677
Total temporarily impaired securities, Unrealized Losses | $ (45) | $ (29)

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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=118939692&loc=d3e27337-111563 + Details
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