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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, 2024
Mar. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Debit and equity securities, realized gains $ 2,807 $ 7,483
Other-than-temporary impairment, gross realized losses (53) (82)
Debt and equity securities, realized loss (215) (203)
Debt and equity securities, net realized gain (loss) 2,592 7,280
Gross losses on sales of other investments 0 (47)
Net gains (losses) on sales of other investments 0 (47)
Net realized investment gains (losses) 2,592 7,233
Unrealized Gain (Loss) on Investments (170) (6,790)
Gain (loss) on investments 2,422 443
Common Stocks And Nonredeemable Preferred Stocks    
Debt Securities, Available-for-sale [Line Items]    
Equity securities, realized gains 2,807 7,483
Equity securities, realized losses $ (162) $ (121)