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Investments In Securities and Fair Value (Schedule Of Gross Unrealized Gains And Losses And Amortized Cost For Securities) (Details) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Fixed maturities, available-for-sale, amortized cost | $ 92,912 |  | $ 100,667
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities | 482 | $ 0 |
Impairment amount for cost-method investments | 0 |  | 0
Government obligations |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Fixed maturities, available-for-sale, amortized cost | 24,060 |  | 25,161
Available-for-sale, at fair value, Gross Unrealized Gains | 152 |  | 6
Available-for-sale, at fair value, Gross Unrealized Losses | 0 |  | 4
Available-for-sale, at fair value, Estimated Fair Value | 24,212 |  | 25,163
General obligations of U.S. states, territories and political subdivisions |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Fixed maturities, available-for-sale, amortized cost | 17,569 |  | 18,887
Available-for-sale, at fair value, Gross Unrealized Gains | 1,245 |  | 843
Available-for-sale, at fair value, Gross Unrealized Losses | 0 |  | 0
Available-for-sale, at fair value, Estimated Fair Value | 18,814 |  | 19,730
Special revenue issuer obligations of U.S. states, territories and political subdivisions |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Fixed maturities, available-for-sale, amortized cost | 47,305 |  | 51,188
Available-for-sale, at fair value, Gross Unrealized Gains | 3,098 |  | 2,530
Available-for-sale, at fair value, Gross Unrealized Losses | 3 |  | 20
Available-for-sale, at fair value, Estimated Fair Value | $ 50,400 |  | $ 53,698
Number of Special Revenue Bonds | 50 |  | 50
Corporate debt securities |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Fixed maturities, available-for-sale, amortized cost | $ 3,978 |  | $ 5,431
Available-for-sale, at fair value, Gross Unrealized Gains | 1,024 |  | 621
Available-for-sale, at fair value, Gross Unrealized Losses | 0 |  | 5
Available-for-sale, at fair value, Estimated Fair Value | 5,002 |  | 6,047
Total fixed maturities |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Fixed maturities, available-for-sale, amortized cost | 92,912 |  | 100,667
Available-for-sale, at fair value, Gross Unrealized Gains | 5,519 |  | 4,000
Available-for-sale, at fair value, Gross Unrealized Losses | 3 |  | 29
Available-for-sale, at fair value, Estimated Fair Value | $ 98,428 |  | $ 104,638

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