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Investments - Schedule of Available-for-Sale Allowance for Credit Losses Roll Forward (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]    
Beginning Balance $ 31,948 $ 28,212
Current Provision for Securities without Prior Allowance 2,071 1,116
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 (2,700) 1,534
Reductions for Securities Sold (1,144) (472)
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period 0 (9)
Ending Balance 30,175 30,381
Foreign government    
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]    
Beginning Balance 21 35
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 (2) 0
Reductions for Securities Sold 0 (6)
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period 0 0
Ending Balance 19 29
Obligations of states and political subdivisions    
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]    
Beginning Balance 570 669
Current Provision for Securities without Prior Allowance 6 9
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 (71) 25
Reductions for Securities Sold (86) (8)
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period 0 0
Ending Balance 419 695
Corporate securities    
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]    
Beginning Balance 14,924 12,999
Current Provision for Securities without Prior Allowance 1,109 1,015
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 (2,643) 1,792
Reductions for Securities Sold (774) (355)
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period 0 (9)
Ending Balance 12,616 15,442
CLO and other ABS    
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]    
Beginning Balance 4,889 2,854
Current Provision for Securities without Prior Allowance 677 90
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 62 (314)
Reductions for Securities Sold (129) (3)
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period 0 0
Ending Balance 5,499 2,627
RMBS    
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]    
Beginning Balance 11,544 11,649
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 (47) 31
Reductions for Securities Sold (155) (100)
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period 0 0
Ending Balance 11,342 11,580
CMBS    
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]    
Beginning Balance 0 6
Current Provision for Securities without Prior Allowance 279 2
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 0
Reductions for Securities Sold 0 0
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period 0 0
Ending Balance $ 280 $ 8