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Investments - AFS Allowance for Credit Losses (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
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Sep. 30, 2023 | Dec. 31, 2022
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Expected credit loss on available-for-sale debt securities at beginning of period | $ 920 | $ 489
Provision for (or reversal of) credit loss expense | (237) | 431
Expected credit loss on available-for-sale debt securities at end of period | 683 | 920
Corporate Bonds |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Expected credit loss on available-for-sale debt securities at beginning of period | 729 | 371
Provision for (or reversal of) credit loss expense | (192) | 358
Expected credit loss on available-for-sale debt securities at end of period | 537 | 729
Municipal Bonds |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Expected credit loss on available-for-sale debt securities at beginning of period | 2 | 1
Provision for (or reversal of) credit loss expense | 2 | 1
Expected credit loss on available-for-sale debt securities at end of period | 4 | 2
Redeemable Preferred Stock |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Expected credit loss on available-for-sale debt securities at beginning of period | 189 | 117
Provision for (or reversal of) credit loss expense | (47) | 72
Expected credit loss on available-for-sale debt securities at end of period | $ 142 | $ 189

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- Definition Amount 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 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aaa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 + Details
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- Definition Amount of increase (decrease) in allowance for credit loss of 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/2009/role/commonPracticeRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -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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