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Investments in Fixed Maturity Securities (AFS Allowance for Credit Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Allowance for expected credit losses at January 1, 2020 | $ 36,708 | $ 37,352
Expected credit losses on securities for which credit losses were not previously recorded | 2,053 | 5,013
Expected credit losses on securities for which credit losses were previously recorded | (37,133) | (5,648)
Reduction due to disposals | (982) | (9)
Allowance for expected credit losses at September 30, 2020 | 646 | 36,708
Foreign Government |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Allowance for expected credit losses at January 1, 2020 | 29,603 | 32,633
Expected credit losses on securities for which credit losses were not previously recorded | 347 | 0
Expected credit losses on securities for which credit losses were previously recorded | (29,355) | (3,030)
Reduction due to disposals | (379) | 0
Allowance for expected credit losses at September 30, 2020 | 216 | 29,603
Corporate |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Allowance for expected credit losses at January 1, 2020 | 5,026 | 4,701
Expected credit losses on securities for which credit losses were not previously recorded | 0 | 982
Expected credit losses on securities for which credit losses were previously recorded | (5,026) | (650)
Reduction due to disposals | 0 | (7)
Allowance for expected credit losses at September 30, 2020 | 0 | 5,026
Mortgage- Backed |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Allowance for expected credit losses at January 1, 2020 | 158 | 18
Expected credit losses on securities for which credit losses were not previously recorded | 1,706 | 1,766
Expected credit losses on securities for which credit losses were previously recorded | (831) | (1,624)
Reduction due to disposals | (603) | (2)
Allowance for expected credit losses at September 30, 2020 | 430 | 158
Asset-backed |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Allowance for expected credit losses at January 1, 2020 | 1,164 | 0
Expected credit losses on securities for which credit losses were not previously recorded | 0 | 1,444
Expected credit losses on securities for which credit losses were previously recorded | (1,164) | (280)
Reduction due to disposals | 0 | 0
Allowance for expected credit losses at September 30, 2020 | 0 | 1,164
State and municipal |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Allowance for expected credit losses at January 1, 2020 | 757 | 0
Expected credit losses on securities for which credit losses were not previously recorded | 0 | 821
Expected credit losses on securities for which credit losses were previously recorded | (757) | (64)
Reduction due to disposals | 0 | 0
Allowance for expected credit losses at September 30, 2020 | $ 0 | $ 757

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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 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 + 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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