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Investments In Securities (Schedule Of Gross Realized Gains And Losses On Securities) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Total, Gross realized gains |  |  | $ 688 | $ 1,232
Total, Gross realized losses |  |  | (63) | (255)
Net realized gains from securities |  |  | 625 | 977
Gain on other investments |  |  | 4 | 13
Total |  |  | 4 | 13
Net realized investment gains | $ 188 | $ 804 | 629 | 990
Issuer Obligations Of U S States Territories And Political Subdivisions Special Revenue [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Total, Gross realized gains |  |  | 0 | 0
Total, Gross realized losses |  |  | 0 | 0
Corporate Debt Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Total, Gross realized gains |  |  | 0 | 0
Common Stocks And Nonredeemable Preferred Stocks |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Equity Securities, Realized Gain |  |  | 688 | 1,232
Equity Securities, Realized Loss |  |  | (63) | (255)
General Obligations Of U.S. States, Territories And Political Subdivisions |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Total, Gross realized losses |  |  | 0 | 0
Impairments of Debt And Equity Securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Total, Gross realized losses |  |  | $ 0 | $ 0

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- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. + References No definition available. + Details
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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=84241550&loc=SL75117546-209714 + Details
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- Definition Amount of realized loss 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=84241550&loc=SL75117546-209714 + Details
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