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Investments (Rollforward of Allowance for Credit Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | $ 4,030 | $ 3,347
Change in allowance on securities with previous allowance | 0 | (1,300)
Recoveries of amounts previously written off | (512) | 0
Ending balance | 3,518 | 2,047
Corporate securities |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | 3,412 | 3,214
Change in allowance on securities with previous allowance | 0 | (1,300)
Recoveries of amounts previously written off | (119) | 0
Ending balance | 3,293 | 1,914
Residential mortgage backed securities |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | 0 | 133
Change in allowance on securities with previous allowance | 0 | 0
Recoveries of amounts previously written off | 0 | 0
Ending balance | 0 | 133
Other asset backed securities |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | 618 | 0
Change in allowance on securities with previous allowance | 0 | 0
Recoveries of amounts previously written off | (393) | 0
Ending balance | $ 225 | $ 0

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- Definition Amount, excluding accrued interest, of decrease in allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), from recovery. + References No definition available. + Details
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- Definition Amount excluding accrued interest, of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-1 + Details
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- Definition Amount, excluding accrued interest, of credit loss expense (reversal of expense) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) with previously recorded allowance and not intended to be sold and not more likely than not will be required to sell before recovery of amortized cost basis. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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