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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, 2021	Mar. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Total, gross realized gains	$ 940	$ 777
Total, gross realized losses	(619)	(1,204)
Net realized gains (losses) from securities	321	(427)
Gain on other investments	0	20
Losses on other investments	0	(5)
Total	0	15
Net realized investment gains (losses)	321	(412)
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Total, gross realized gains	0	30
Total, gross realized losses	(23)	0
Common stocks
Debt Securities, Available-for-sale [Line Items]
Equity securities, realized gain	940	747
Equity securities, realized loss	(596)	(722)
Other-than-temporary impairment of securities
Debt Securities, Available-for-sale [Line Items]
Total, gross realized losses	$ 0	$ (482)

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Amount of realized gain from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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