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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