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Investments In Securities and Fair Value (Schedule Of Unrealized Losses On Investments) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
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	1,103	1,103
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(2)	(3)
Total temporarily impaired securities, Total Fair Value	1,103	1,103
Total temporarily impaired securities, Unrealized Losses	(2)	(3)
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Total temporarily impaired securities, Less than 12 Months, Fair Value	17,887	20,630
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses	(17)	(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	17,887	20,630
Total temporarily impaired securities, Unrealized Losses	(17)	(24)
Total temporarily impaired securities
Debt Securities, Available-for-sale [Line Items]
Total temporarily impaired securities, Less than 12 Months, Fair Value	17,887	20,630
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses	(17)	(24)
Total temporarily impaired securities, 12 Months or Longer, Fair Value	1,103	1,103
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(2)	(3)
Total temporarily impaired securities, Total Fair Value	18,990	21,733
Total temporarily impaired securities, Unrealized Losses	$ (19)	$ (27)

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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

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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

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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.

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