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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]        
Beginning Balance $ 28,733 $ 31,309 $ 31,948 $ 28,212
Current Provision for Securities without Prior Allowance 715 2,429 3,261 3,329
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration 1,938 0 1,938 0
Increase (Decrease) on Securities with Prior Allowance, excluding intent (or Requirement) to Sell Securities (1,544) (4,620) (5,606) (1,637)
Reductions for Securities Sold (766) (614) (2,465) (1,391)
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period 0 0 0 (9)
Ending Balance 29,076 28,504 29,076 28,504
Foreign government        
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]        
Beginning Balance 21 26 21 35
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) (2) (4)
Reductions for Securities Sold 0 0 0 (7)
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period 0 0 0 0
Ending Balance 19 24 19 24
Obligations of states and political subdivisions        
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]        
Beginning Balance 390 639 570 669
Current Provision for Securities without Prior Allowance 13 107 18 118
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 (77) (266) (156) (299)
Reductions for Securities Sold 0 (8) (106) (16)
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period 0 0 0 0
Ending Balance 326 472 326 472
Corporate securities        
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]        
Beginning Balance 9,571 15,950 14,924 12,999
Current Provision for Securities without Prior Allowance 369 747 957 1,325
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 (1,568) (4,231) (6,363) (1,282)
Reductions for Securities Sold (352) (432) (1,498) (999)
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period 0 0 0 (9)
Ending Balance 8,020 12,034 8,020 12,034
CLO and other ABS        
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]        
Beginning Balance 7,230 3,022 4,889 2,854
Current Provision for Securities without Prior Allowance 333 1,575 2,177 1,886
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration 1,938 0 1,938 0
Increase (Decrease) on Securities with Prior Allowance, excluding intent (or Requirement) to Sell Securities 68 (49) 752 (188)
Reductions for Securities Sold (335) (86) (522) (90)
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period 0 0 0 0
Ending Balance 9,234 4,462 9,234 4,462
RMBS        
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]        
Beginning Balance 11,422 11,660 11,544 11,649
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 25 (63) 163 139
Reductions for Securities Sold (79) (88) (339) (279)
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period 0 0 0 0
Ending Balance 11,368 11,509 11,368 11,509
CMBS        
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]        
Beginning Balance 99 12 0 6
Current Provision for Securities without Prior Allowance 0 0 109 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 10 (9) 0 (3)
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 $ 109 $ 3 $ 109 $ 3