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Investments In Securities and Fair Value (Schedule Of Gross Realized and Unrealized Gains And Losses On Securities) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Marketable Security, Gain (Loss) [Abstract] |  |  |
Debt Securities, Realized Gain (Loss) | $ 3 | $ 0 |
Equity securities, realized gains | 2,557 | 2,807 |
Debit and equity securities, realized gains | 2,560 | 2,807 |
Equity securities, realized losses | (287) | (162) |
Other Than Temporary Impairment Loss Investment Securities Recognized in Earnings | 0 | 53 |
Debt and Equity Securities, Realized Loss | (287) | (215) |
Debt and equity securities, net realized gain (loss) | 2,273 | 2,592 |
Gross gains on other investments | 1 | 0 |
Write-down of other assets | 275 | 0 | $ 309
Net gains (losses) on other investments | (274) | 0 |
Net realized investment gains (losses) | 1,999 | 2,592 |
Unrealized gain (loss) on investments | (3,178) | (170) |
Gain (loss) on investments | (1,179) | 2,422 |
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains and Losses On Available-for-Sale Securities |  |  |
Marketable Security, Gain (Loss) [Abstract] |  |  |
Other Than Temporary Impairment Loss Investment Securities Recognized in Earnings | 0 | 53 |
Gain (loss) on investments | $ 3 | $ 0 |

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