v3.26.1
Contingent Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
Contingent Liabilities [Line Items]        
Allowance for credit losses on reinsurance recoverables $ 1,700 $ 1,600 $ 1,500 $ 1,200
Excess & Surplus Lines | Commercial Auto LPT | Aleka | Loss Fund Trust        
Contingent Liabilities [Line Items]        
Cash equivalent collateral trust arrangement 2,200      
Excess & Surplus Lines | Commercial Auto LPT | Rasier | Indemnity Trust And Loss Fund Trust        
Contingent Liabilities [Line Items]        
Cash equivalent collateral trust arrangement 35,200      
Excess & Surplus Lines | Commercial Auto LPT | Rasier | Loss Fund Trust        
Contingent Liabilities [Line Items]        
Cash equivalent collateral trust arrangement 5,300      
Excess & Surplus Lines | Commercial Auto LPT | Rasier and Aleka | Loss Fund Trust        
Contingent Liabilities [Line Items]        
Cash equivalent collateral trust arrangement 8,600      
Commercial Auto LPT | Excess & Surplus Lines | Commercial Auto LPT | Aleka        
Contingent Liabilities [Line Items]        
Reinsurance recoverables 9,900      
Commercial Auto LPT | Excess & Surplus Lines | Commercial Auto LPT | Aleka | LPT Trust And Loss Fund Trust        
Contingent Liabilities [Line Items]        
Cash equivalent collateral trust arrangement $ 16,800      
Commercial Auto LPT | Excess & Surplus Lines | Commercial Auto LPT | Rasier and Aleka        
Contingent Liabilities [Line Items]        
Required collateral, percentage 102.00%