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Investments - Schedule of Available-for-Sale Allowance for Credit Losses Roll Forward (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | $ 31,309 | $ 31,425 | $ 28,212 | $ 45,721
Current Provision for Securities without Prior Allowance | 2,429 | 2,206 | 3,329 | 7,107
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration | 0 | 0 | 0 | 0
Increase (Decrease) on Securities with Prior Allowance, excluding intent (or Requirement) to Sell Securities | (4,620) | 262 | (1,637) | (15,032)
Reductions for Securities Sold | (614) | (355) | (1,391) | (4,207)
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period | 0 | 0 | (9) | (51)
Ending Balance | 28,504 | 33,538 | 28,504 | 33,538
Foreign government |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 26 | 34 | 35 | 284
Current Provision for Securities without Prior Allowance | 0 | 0 | 0 | 0
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration | 0 | 0 | 0 | 0
Increase (Decrease) on Securities with Prior Allowance, excluding intent (or Requirement) to Sell Securities | (2) | (2) | (4) | (252)
Reductions for Securities Sold | 0 | 0 | (7) | 0
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period | 0 | 0 | 0 | 0
Ending Balance | 24 | 32 | 24 | 32
Obligations of states and political subdivisions |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 639 | 769 | 669 | 1,024
Current Provision for Securities without Prior Allowance | 107 | 96 | 118 | 100
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration | 0 | 0 | 0 | 0
Increase (Decrease) on Securities with Prior Allowance, excluding intent (or Requirement) to Sell Securities | (266) | 55 | (299) | (120)
Reductions for Securities Sold | (8) | (28) | (16) | (112)
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period | 0 | 0 | 0 | 0
Ending Balance | 472 | 892 | 472 | 892
Corporate securities |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 15,950 | 16,149 | 12,999 | 30,330
Current Provision for Securities without Prior Allowance | 747 | 1,939 | 1,325 | 6,078
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration | 0 | 0 | 0 | 0
Increase (Decrease) on Securities with Prior Allowance, excluding intent (or Requirement) to Sell Securities | (4,231) | (111) | (1,282) | (14,992)
Reductions for Securities Sold | (432) | (212) | (999) | (3,600)
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period | 0 | 0 | (9) | (51)
Ending Balance | 12,034 | 17,765 | 12,034 | 17,765
CLO and other ABS |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 3,022 | 2,915 | 2,854 | 2,375
Current Provision for Securities without Prior Allowance | 1,575 | 148 | 1,886 | 904
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration | 0 | 0 | 0 | 0
Increase (Decrease) on Securities with Prior Allowance, excluding intent (or Requirement) to Sell Securities | (49) | 167 | (188) | (40)
Reductions for Securities Sold | (86) | (12) | (90) | (21)
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period | 0 | 0 | 0 | 0
Ending Balance | 4,462 | 3,218 | 4,462 | 3,218
RMBS |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 11,660 | 11,550 | 11,649 | 11,597
Current Provision for Securities without Prior Allowance | 0 | 23 | 0 | 24
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration | 0 | 0 | 0 | 0
Increase (Decrease) on Securities with Prior Allowance, excluding intent (or Requirement) to Sell Securities | (63) | 154 | 139 | 334
Reductions for Securities Sold | (88) | (102) | (279) | (330)
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period | 0 | 0 | 0 | 0
Ending Balance | 11,509 | 11,625 | 11,509 | 11,625
CMBS |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 12 | 8 | 6 | 111
Current Provision for Securities without Prior Allowance | 0 | 0 | 0 | 1
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration | 0 | 0 | 0 | 0
Increase (Decrease) on Securities with Prior Allowance, excluding intent (or Requirement) to Sell Securities | (9) | (1) | (3) | 38
Reductions for Securities Sold | 0 | (1) | 0 | (144)
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period | 0 | 0 | 0 | 0
Ending Balance | $ 3 | $ 6 | $ 3 | $ 6

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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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