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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
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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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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=120269885&loc=SL75117546-209714 + Details
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