v3.26.3
Investments - Schedule of Available-for-Sale Allowance for Credit Losses Roll Forward (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]        
Beginning Balance $ 39,102 $ 28,733 $ 31,287 $ 31,948
Current Provision for Securities without Prior Allowance 11,044 715 19,213 3,261
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration 0 1,938 0 1,938
Increase (Decrease) on Securities with Prior Allowance, excluding intent (or Requirement) to Sell Securities 1,832 (1,544) 3,072 (5,606)
Reductions for Securities Sold (417) (766) (2,011) (2,465)
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period 0 0 0 0
Ending Balance 51,561 29,076 51,561 29,076
Foreign government        
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]        
Beginning Balance 79 21 16 21
Current Provision for Securities without Prior Allowance 0 0 65 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 (4) (2) (6) (2)
Reductions for Securities Sold 0 0 0 0
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period 0 0 0 0
Ending Balance 75 19 75 19
Obligations of states and political subdivisions        
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]        
Beginning Balance 305 390 259 570
Current Provision for Securities without Prior Allowance 333 13 420 18
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 (19) (77) (57) (156)
Reductions for Securities Sold 0 0 (3) (106)
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period 0 0 0 0
Ending Balance 619 326 619 326
Corporate securities        
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]        
Beginning Balance 12,398 9,571 7,691 14,924
Current Provision for Securities without Prior Allowance 10,550 369 18,179 957
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 2,281 (1,568) 679 (6,363)
Reductions for Securities Sold (336) (352) (1,656) (1,498)
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period 0 0 0 0
Ending Balance 24,893 8,020 24,893 8,020
CLO and other ABS        
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]        
Beginning Balance 14,917 7,230 11,902 4,889
Current Provision for Securities without Prior Allowance 161 333 512 2,177
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration 0 1,938 0 1,938
Increase (Decrease) on Securities with Prior Allowance, excluding intent (or Requirement) to Sell Securities (654) 68 2,100 752
Reductions for Securities Sold (7) (335) (97) (522)
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period 0 0 0 0
Ending Balance 14,417 9,234 14,417 9,234
RMBS        
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]        
Beginning Balance 11,394 11,422 11,284 11,544
Current Provision for Securities without Prior Allowance 0 0 37 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 223 25 477 163
Reductions for Securities Sold (74) (79) (255) (339)
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period 0 0 0 0
Ending Balance 11,543 11,368 11,543 11,368
CMBS        
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]        
Beginning Balance 9 99 135 0
Current Provision for Securities without Prior Allowance 0 0 0 109
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 5 10 (121) 0
Reductions for Securities Sold 0 0 0 0
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period 0 0 0 0
Ending Balance $ 14 $ 109 $ 14 $ 109