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Investments In Securities and Fair Value (Schedule Of Gross Realized Gains And Losses On Securities) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Equity securities, realized gains $ 7,483 $ 1,747
Debit and equity securities, realized gains 7,483 1,747
Equity securities, realized losses (121) 0
Other-than-temporary impairment, gross realized losses (82) 0
Debt and equity securities, realized loss (203) 0
Debt and equity securities, net realized gain (loss) 7,280 1,747
Gross losses on sales of other investments (47) 0
Net gains (losses) on sales of other investments (47) 0
Net realized investment gains (losses) $ 7,233 $ 1,747