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Investments (Rollforward of Allowance for Credit Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | $ 2,846 | $ 64,771
Additions for credit losses not previously recorded | 4,895 | 1,112
Change in allowance on securities with previous allowance | (3,966) | (482)
Reduction for securities with credit losses due to intent to sell | 0 | (209)
Reduction for securities sold during the period | (428) | (50,758)
Write-offs charged against the allowance | 0 | (10,032)
Recoveries of amounts previously written off | 0 | (1,556)
Ending balance | 3,347 | 2,846
States, municipalities and territories |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | 2,776 | 2,844
Additions for credit losses not previously recorded | 0 | 0
Change in allowance on securities with previous allowance | (2,776) | (68)
Reduction for securities with credit losses due to intent to sell |  | 0
Reduction for securities sold during the period | 0 | 0
Write-offs charged against the allowance | 0 | 0
Recoveries of amounts previously written off | 0 | 0
Ending balance | 0 | 2,776
Corporate securities |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | 0 | 60,193
Additions for credit losses not previously recorded | 3,825 | 705
Change in allowance on securities with previous allowance | (611) | 443
Reduction for securities with credit losses due to intent to sell | 0 | (209)
Reduction for securities sold during the period | 0 | (50,758)
Write-offs charged against the allowance | 0 | (10,032)
Recoveries of amounts previously written off | 0 | (342)
Ending balance | 3,214 | 0
Residential mortgage backed securities |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | 70 | 1,734
Additions for credit losses not previously recorded | 1,070 | 407
Change in allowance on securities with previous allowance | (579) | (857)
Reduction for securities with credit losses due to intent to sell | 0 | 0
Reduction for securities sold during the period | (428) | 0
Write-offs charged against the allowance | 0 | 0
Recoveries of amounts previously written off | 0 | (1,214)
Ending balance | $ 133 | $ 70

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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- Definition Amount, excluding accrued interest, of credit loss expense on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) with no credit loss previously recorded. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 + Details
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