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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		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Debt Securities, Available-for-sale [Line Items]
Debt securities, realized gains			$ 0	$ 53
Equity securities, realized gains			7,120	1,428
Debit and equity securities, realized gains			7,120	1,481
Debt Securities, Available-for-sale, Realized Loss			(104)	(34)
Equity securities, realized losses			(209)	(677)
Other-than-temporary impairment, gross realized losses			(162)	0
Debt and Equity Securities, Realized Loss			(475)	(711)
Debt and equity securities, net realized gain (loss)			6,645	770
Gross gains on sales of other investments			30	1
Gross losses on sales of other investments			(409)	0
Net gains (losses) on sales of other investments			(379)	1
Net realized investment gains (losses)	$ 2,481	$ 268	$ 6,266	$ 771

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