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Investments In Securities (Schedule Of Unrealized Losses On Investments) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Government obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total temporarily impaired securities, Less than 12 Months, Fair Value | $ 1,006 | $ 1,016
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses | (2) | (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 | 1,006 | 1,016
Total temporarily impaired securities, Unrealized Losses | (2) | (7)
General 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 |  | 4,888
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses |  | (32)
Total temporarily impaired securities, 12 Months or Longer, Fair Value |  | 6,469
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | (111)
Total temporarily impaired securities, Total Fair Value |  | 11,357
Total temporarily impaired securities, Unrealized Losses |  | (143)
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 | 2,160 | 12,326
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses | (12) | (100)
Total temporarily impaired securities, 12 Months or Longer, Fair Value | 1,126 | 9,720
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1) | (229)
Total temporarily impaired securities, Total Fair Value | 3,286 | 22,046
Total temporarily impaired securities, Unrealized Losses | (13) | (329)
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total temporarily impaired securities, Less than 12 Months, Fair Value |  | 4,490
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses |  | (28)
Total temporarily impaired securities, 12 Months or Longer, Fair Value |  | 3,733
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | (19)
Total temporarily impaired securities, Total Fair Value |  | 8,223
Total temporarily impaired securities, Unrealized Losses |  | (47)
Total temporarily impaired securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total temporarily impaired securities, Less than 12 Months, Fair Value | 3,166 | 22,720
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses | (14) | (167)
Total temporarily impaired securities, 12 Months or Longer, Fair Value | 1,126 | 19,922
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1) | (359)
Total temporarily impaired securities, Total Fair Value | 4,292 | 42,642
Total temporarily impaired securities, Unrealized Losses | $ (15) | $ (526)

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