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Investments In Securities (Schedule Of Unrealized Losses On Investments) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
Total temporarily impaired securities, Less than 12 Months, Fair Value | $ 38,314 | $ 22,897
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses | (349) | (96)
Total temporarily impaired securities, 12 Months or Longer, Fair Value | 7,842 | 7,558
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (319) | (127)
Total temporarily impaired securities, Total Fair Value | 46,156 | 30,455
Total temporarily impaired securities, Unrealized Losses | (668) | (223)
Government obligations |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total temporarily impaired securities, Less than 12 Months, Fair Value |  | 1,042
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses |  | (1)
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 |  | 1,042
Total temporarily impaired securities, Unrealized Losses |  | (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 | 9,120 | 4,560
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses | (108) | (27)
Total temporarily impaired securities, 12 Months or Longer, Fair Value | 3,430 | 3,535
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (119) | (23)
Total temporarily impaired securities, Total Fair Value | 12,550 | 8,095
Total temporarily impaired securities, Unrealized Losses | (227) | (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 | 18,979 | 13,551
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses | (180) | (61)
Total temporarily impaired securities, 12 Months or Longer, Fair Value | 4,412 | 4,023
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (200) | (104)
Total temporarily impaired securities, Total Fair Value | 23,391 | 17,574
Total temporarily impaired securities, Unrealized Losses | (380) | (165)
Corporate Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total temporarily impaired securities, Less than 12 Months, Fair Value | 10,215 | 3,744
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses | (61) | (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 | 10,215 | 3,744
Total temporarily impaired securities, Unrealized Losses | (61) | (7)
Total Fixed Income Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total temporarily impaired securities, Less than 12 Months, Fair Value | 38,314 | 22,897
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses | (349) | (96)
Total temporarily impaired securities, 12 Months or Longer, Fair Value | 7,842 | 7,558
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (319) | (127)
Total temporarily impaired securities, Total Fair Value | 46,156 | 30,455
Total temporarily impaired securities, Unrealized Losses | $ (668) | $ (223)

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