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Investments in Fixed Maturity Securities (AFS Allowance for Credit Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance, beginning of period | $ 318 | $ 21,837 | $ 646 | $ 36,708
Change on securities for which credit losses were not previously recorded | 3 | 47 | 13 | 2,048
Change on securities for which credit losses were previously recorded | (49) | (14,552) | (387) | (30,863)
Reduction due to disposals | 0 | (379) | 0 | (940)
Balance, end of period | 272 | 6,953 | 272 | 6,953
Foreign government |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance, beginning of period | 318 | 19,469 | 216 | 29,603
Change on securities for which credit losses were not previously recorded | 3 | 47 | 3 | 347
Change on securities for which credit losses were previously recorded | (49) | (12,782) | 53 | (23,216)
Reduction due to disposals | 0 | (379) | 0 | (379)
Balance, end of period | 272 | 6,355 | 272 | 6,355
Mortgage-backed |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance, beginning of period | 0 | 1,140 | 430 | 158
Change on securities for which credit losses were not previously recorded | 0 | 0 | 0 | 1,701
Change on securities for which credit losses were previously recorded | 0 | (1,088) | (430) | (1,246)
Reduction due to disposals | 0 | 0 | 0 | (561)
Balance, end of period | 0 | 52 | 0 | 52
State and municipal |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance, beginning of period | 0 | 339 | 0 | 757
Change on securities for which credit losses were not previously recorded | 0 | 0 | 10 | 0
Change on securities for which credit losses were previously recorded | 0 | (339) | (10) | (757)
Reduction due to disposals | 0 | 0 | 0 | 0
Balance, end of period | 0 | 0 | 0 | 0
Corporate |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance, beginning of period |  |  | 0 | 5,026
Change on securities for which credit losses were not previously recorded |  |  |  | 0
Change on securities for which credit losses were previously recorded |  |  |  | (5,026)
Reduction due to disposals |  |  |  | 0
Balance, end of period | 0 | 0 | 0 | 0
Asset-backed |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance, beginning of period |  | 889 | 0 | 1,164
Change on securities for which credit losses were not previously recorded |  | 0 |  | 0
Change on securities for which credit losses were previously recorded |  | (343) |  | (618)
Reduction due to disposals |  | 0 |  | 0
Balance, end of period | $ 0 | $ 546 | $ 0 | $ 546

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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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147476148/220-40-50-22 + Details
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- Definition Amount of expense (reversal of expense) for 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), not intended to be sold and not more likely than not will be required to sell before recovery of amortized cost basis, with previously recorded allowance. + 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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147476148/220-40-50-22 + 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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