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Investments - Available-for-Sale Allowance for Credit Losses Roll Forward (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 losses, period beginning balance | $ 28,212 | $ 45,721
Current Provision for Securities without Prior Allowance | 1,116 | 3,730
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration | 0 | 0
Increase (Decrease) on Securities with Prior Allowance, excluding intent (or Requirement) to Sell Securities | 1,534 | (13,259)
Reductions for Securities Sold | (472) | (2,627)
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period | (9) | (11)
Allowance for credit losses, period ending balance | 30,381 | 33,554
Foreign government |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward] |  |
Allowance for credit losses, period beginning balance | 35 | 284
Current Provision for Securities without Prior Allowance | 0 | 0
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration | 0 | 0
Increase (Decrease) on Securities with Prior Allowance, excluding intent (or Requirement) to Sell Securities | 0 | (248)
Reductions for Securities Sold | (6) | 0
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period | 0 | 0
Allowance for credit losses, period ending balance | 29 | 36
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward] |  |
Allowance for credit losses, period beginning balance | 669 | 1,024
Current Provision for Securities without Prior Allowance | 9 | 50
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration | 0 | 0
Increase (Decrease) on Securities with Prior Allowance, excluding intent (or Requirement) to Sell Securities | 25 | (254)
Reductions for Securities Sold | (8) | (83)
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period | 0 | 0
Allowance for credit losses, period ending balance | 695 | 737
Corporate securities |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward] |  |
Allowance for credit losses, period beginning balance | 12,999 | 30,330
Current Provision for Securities without Prior Allowance | 1,015 | 2,854
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration | 0 | 0
Increase (Decrease) on Securities with Prior Allowance, excluding intent (or Requirement) to Sell Securities | 1,792 | (13,964)
Reductions for Securities Sold | (355) | (2,453)
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period | (9) | (11)
Allowance for credit losses, period ending balance | 15,442 | 16,756
CLO and other ABS |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward] |  |
Allowance for credit losses, period beginning balance | 2,854 | 2,375
Current Provision for Securities without Prior Allowance | 90 | 787
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration | 0 | 0
Increase (Decrease) on Securities with Prior Allowance, excluding intent (or Requirement) to Sell Securities | (314) | 736
Reductions for Securities Sold | (3) | (3)
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period | 0 | 0
Allowance for credit losses, period ending balance | 2,627 | 3,895
RMBS |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward] |  |
Allowance for credit losses, period beginning balance | 11,649 | 11,597
Current Provision for Securities without Prior Allowance | 0 | 12
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration | 0 | 0
Increase (Decrease) on Securities with Prior Allowance, excluding intent (or Requirement) to Sell Securities | 31 | 219
Reductions for Securities Sold | (100) | (88)
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period | 0 | 0
Allowance for credit losses, period ending balance | 11,580 | 11,740
CMBS |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward] |  |
Allowance for credit losses, period beginning balance | 6 | 111
Current Provision for Securities without Prior Allowance | 2 | 27
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration | 0 | 0
Increase (Decrease) on Securities with Prior Allowance, excluding intent (or Requirement) to Sell Securities | 0 | 252
Reductions for Securities Sold | 0 | 0
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period | 0 | 0
Allowance for credit losses, period ending balance | $ 8 | $ 390

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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 increase 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) and beneficial interest, purchased with credit deterioration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (c) -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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