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Investments (Credit Losses Related to Debt Securities) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Allowance for credit loss beginning balance | $ 555 | $ 427
No allowance for credit losses has been previously recognized | 740 |
Securities sold during the period | (158) | (3)
Allowance for credit loss ending balance | 1,137 | 424
Corporate Debt |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Allowance for credit loss beginning balance | 0 |
No allowance for credit losses has been previously recognized | 740 |
Securities sold during the period | 0 |
Allowance for credit loss ending balance | 740 |
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Allowance for credit loss beginning balance | 211 | 229
No allowance for credit losses has been previously recognized | 0 |
Securities sold during the period | (4) | (2)
Allowance for credit loss ending balance | 207 | 227
Other commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Allowance for credit loss beginning balance | 151 |
No allowance for credit losses has been previously recognized | 0 |
Securities sold during the period | (151) |
Allowance for credit loss ending balance | 0 |
Other asset-backed securities |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Allowance for credit loss beginning balance | 193 | 198
No allowance for credit losses has been previously recognized | 0 |
Securities sold during the period | (3) | (1)
Allowance for credit loss ending balance | $ 190 | $ 197

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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 expense 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), for which no credit loss was previously recorded. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (b) -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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- Definition Amount 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 sale. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 + Details
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