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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, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Impairment amount for cost-method investments | $ 0 |  | $ 0
Total, amortized cost | 77,714 |  | 112,037
Fixed maturity securities, available-for-sale, at fair value (amortized cost: September 30, 2021: $77,714; December 31, 2020: $112,037) | 82,306 |  | 117,713
Other-than-temporary impairment loss, debt securities, available-for-sale, recognized in earnings | 0 | $ 482 |
Government obligations |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax |  |  | 57
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax |  |  | 0
Total, amortized cost |  |  | 24,026
Fixed maturity securities, available-for-sale, at fair value (amortized cost: September 30, 2021: $77,714; December 31, 2020: $112,037) |  |  | 24,083
General obligations of U.S. states, territories and political subdivisions |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 991 |  | 1,262
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | 0 |  | 0
Total, amortized cost | 17,214 |  | 17,391
Fixed maturity securities, available-for-sale, at fair value (amortized cost: September 30, 2021: $77,714; December 31, 2020: $112,037) | $ 18,205 |  | $ 18,653
Special revenue issuer obligations of U.S. states, territories and political subdivisions |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Number of Special Revenue Bonds | 50 |  | 50
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | $ 2,598 |  | $ 3,270
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | 2 |  | 3
Total, amortized cost | 42,356 |  | 44,939
Fixed maturity securities, available-for-sale, at fair value (amortized cost: September 30, 2021: $77,714; December 31, 2020: $112,037) | 44,952 |  | 48,206
Corporate debt securities |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 1,017 |  | 1,114
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | 12 |  | 24
Total, amortized cost | 18,144 |  | 25,681
Fixed maturity securities, available-for-sale, at fair value (amortized cost: September 30, 2021: $77,714; December 31, 2020: $112,037) | 19,149 |  | 26,771
Total fixed maturities |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 4,606 |  | 5,703
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | 14 |  | 27
Total, amortized cost | 77,714 |  | 112,037
Fixed maturity securities, available-for-sale, at fair value (amortized cost: September 30, 2021: $77,714; December 31, 2020: $112,037) | $ 82,306 |  | $ 117,713

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