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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 | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($)
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Fixed maturities, available-for-sale, amortized cost | $ 98,068 |  | $ 112,037
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities | 0 | $ 482 |
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 | 12,003 |  | 24,026
Available-for-sale, at fair value, Gross Unrealized Gains | 7 |  | 57
Available-for-sale, at fair value, Gross Unrealized Losses | 0 |  | 0
Available-for-sale, at fair value, Estimated Fair Value | 12,010 |  | 24,083
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 | 17,333 |  | 17,391
Available-for-sale, at fair value, Gross Unrealized Gains | 1,053 |  | 1,262
Available-for-sale, at fair value, Gross Unrealized Losses | 0 |  | 0
Available-for-sale, at fair value, Estimated Fair Value | 18,386 |  | 18,653
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 | 44,671 |  | 44,939
Available-for-sale, at fair value, Gross Unrealized Gains | 2,816 |  | 3,270
Available-for-sale, at fair value, Gross Unrealized Losses | 3 |  | 3
Available-for-sale, at fair value, Estimated Fair Value | $ 47,484 |  | $ 48,206
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 | $ 24,061 |  | $ 25,681
Available-for-sale, at fair value, Gross Unrealized Gains | 1,067 |  | 1,114
Available-for-sale, at fair value, Gross Unrealized Losses | 38 |  | 24
Available-for-sale, at fair value, Estimated Fair Value | 25,090 |  | 26,771
Total fixed maturities |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Fixed maturities, available-for-sale, amortized cost | 98,068 |  | 112,037
Available-for-sale, at fair value, Gross Unrealized Gains | 4,943 |  | 5,703
Available-for-sale, at fair value, Gross Unrealized Losses | 41 |  | 27
Available-for-sale, at fair value, Estimated Fair Value | $ 102,970 |  | $ 117,713

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