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Investments - Schedule of Private Debt and Equity (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2025
USD ($)
note
Mar. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
Net Investment Income [Line Items]      
Carrying Value $ 52,768   $ 36,700
Investment Income 200 $ (145)  
Renewable energy LLCs      
Net Investment Income [Line Items]      
Carrying Value 7,643   7,690
Investment Income 0 (286)  
Renewable energy notes receivable      
Net Investment Income [Line Items]      
Carrying Value 0   0
Investment Income 0 138  
Limited partnerships      
Net Investment Income [Line Items]      
Carrying Value 16,695   15,108
Investment Income 9 (115)  
Private debt      
Net Investment Income [Line Items]      
Carrying Value 28,430   13,902
Investment Income 191 118  
Excess and Surplus Lines      
Net Investment Income [Line Items]      
Carrying Value 52,304   36,236
Investment Income 200 (222)  
Excess and Surplus Lines | Renewable energy LLCs      
Net Investment Income [Line Items]      
Carrying Value 7,643   7,690
Investment Income 0 (286)  
Excess and Surplus Lines | Renewable energy LLCs | Investment in LLC      
Net Investment Income [Line Items]      
Cash distributions from LLCs $ 48 14  
Excess and Surplus Lines | Renewable energy LLCs | Minimum | Investment in LLC | Various LLCs      
Net Investment Income [Line Items]      
Ownership percentage 3.60%    
Excess and Surplus Lines | Renewable energy LLCs | Maximum | Investment in LLC | Various LLCs      
Net Investment Income [Line Items]      
Ownership percentage 5.00%    
Excess and Surplus Lines | Renewable energy notes receivable      
Net Investment Income [Line Items]      
Carrying Value $ 0   0
Investment Income $ 0 61  
Number of notes issued | note 2    
Rate of interest 12.00%    
Total principal balance received   608  
Excess and Surplus Lines | Limited partnerships      
Net Investment Income [Line Items]      
Carrying Value $ 16,231   14,644
Investment Income 9 (115)  
Outstanding commitments to invest 5,000    
Excess and Surplus Lines | Private debt      
Net Investment Income [Line Items]      
Carrying Value 28,430   13,902
Investment Income $ 191 118  
Excess and Surplus Lines | Private speciality credit      
Net Investment Income [Line Items]      
Number of notes issued | note 4    
Commitment to investment in notes $ 5,600    
Excess and Surplus Lines | Private speciality credit | Notes receivable one      
Net Investment Income [Line Items]      
Rate of interest 4.25%    
Excess and Surplus Lines | Private speciality credit | Notes receivable two      
Net Investment Income [Line Items]      
Rate of interest 5.25%    
Excess and Surplus Lines | Private speciality credit | Notes receivable three      
Net Investment Income [Line Items]      
Rate of interest 6.50%    
Excess and Surplus Lines | Private speciality credit | Notes receivable four      
Net Investment Income [Line Items]      
Rate of interest 8.00%    
Corporate and Other      
Net Investment Income [Line Items]      
Carrying Value $ 464   464
Investment Income 0 77  
Corporate and Other | Renewable energy LLCs      
Net Investment Income [Line Items]      
Carrying Value 0   0
Investment Income 0 0  
Corporate and Other | Renewable energy notes receivable      
Net Investment Income [Line Items]      
Carrying Value 0   0
Investment Income $ 0 77  
Number of notes issued | note 2    
Rate of interest 12.00%    
Total principal balance received   761  
Corporate and Other | Limited partnerships      
Net Investment Income [Line Items]      
Carrying Value $ 464   464
Investment Income 0 0  
Corporate and Other | Private debt      
Net Investment Income [Line Items]      
Carrying Value 0   $ 0
Investment Income $ 0 $ 0