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Investments (Available-for-sale allowance for credit losses roll forward) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |
Allowance for credit losses, beginning balance | $ 45,721 | $ 9,724
Current provision for securities without prior allowance | 4,142 | 34,561
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase | 0 | 8,318
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities | (17,040) | 4,608
Reduction for securities sold | (4,340) | (7,636)
Reduction for securities identified as intent (or requirement) to sell during the period | (271) | (3,854)
Allowance for credit losses, ending balance | 28,212 | 45,721
Foreign Government [Member] |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |
Allowance for credit losses, beginning balance | 284 | 46
Current provision for securities without prior allowance | 0 | 291
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase | 0 | 0
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities | (249) | 4
Reduction for securities sold | 0 | (57)
Reduction for securities identified as intent (or requirement) to sell during the period | 0 | 0
Allowance for credit losses, ending balance | 35 | 284
Obligations of States and Political Subdivisions [Member] |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |
Allowance for credit losses, beginning balance | 1,024 | 137
Current provision for securities without prior allowance | 48 | 1,087
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase | 0 | 0
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities | (281) | (6)
Reduction for securities sold | (122) | (194)
Reduction for securities identified as intent (or requirement) to sell during the period | 0 | 0
Allowance for credit losses, ending balance | 669 | 1,024
Corporate Securities [Member] |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |
Allowance for credit losses, beginning balance | 30,330 | 6,682
Current provision for securities without prior allowance | 3,457 | 30,670
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase | 0 | 0
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities | (16,879) | 3,714
Reduction for securities sold | (3,638) | (6,902)
Reduction for securities identified as intent (or requirement) to sell during the period | (271) | (3,834)
Allowance for credit losses, ending balance | 12,999 | 30,330
Collateralized Loan Obligations and Other Asset-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |
Allowance for credit losses, beginning balance | 2,375 | 939
Current provision for securities without prior allowance | 619 | 2,158
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase | 0 | 0
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities | (116) | (652)
Reduction for securities sold | (24) | (50)
Reduction for securities identified as intent (or requirement) to sell during the period | 0 | (20)
Allowance for credit losses, ending balance | 2,854 | 2,375
Residential Mortgage Backed Securities [Member] |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |
Allowance for credit losses, beginning balance | 11,597 | 1,909
Current provision for securities without prior allowance | 17 | 245
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase | 0 | 8,318
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities | 447 | 1,558
Reduction for securities sold | (412) | (433)
Reduction for securities identified as intent (or requirement) to sell during the period | 0 | 0
Allowance for credit losses, ending balance | 11,649 | 11,597
Commercial Mortgage Backed Securities [Member] |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |
Allowance for credit losses, beginning balance | 111 | 11
Current provision for securities without prior allowance | 1 | 110
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase | 0 | 0
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities | 38 | (10)
Reduction for securities sold | (144) | 0
Reduction for securities identified as intent (or requirement) to sell during the period | 0 | 0
Allowance for credit losses, ending balance | $ 6 | $ 111

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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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