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RESERVES FOR LOSSES AND LOSS SETTLEMENT EXPENSES - Reconciliation of the Disclosure Claims Development to the Liability for Claims and Claim Adjustment Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net outstanding liabilities for unpaid losses and allocated loss settlement expenses $ 1,612,566      
Net outstanding liabilities for unpaid unallocated loss settlement expenses 98,627      
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance 1,711,193      
Reinsurance recoverable on unpaid losses and allocated loss settlement expenses 213,633      
Total gross liability for unpaid losses and loss settlement expenses 1,924,826 $ 1,796,782 $ 1,638,755 $ 1,497,274
Commercial other liability        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net outstanding liabilities for unpaid losses and allocated loss settlement expenses 811,208      
Reinsurance recoverable on unpaid losses and allocated loss settlement expenses 109,118      
Commercial fire and allied        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net outstanding liabilities for unpaid losses and allocated loss settlement expenses 130,890      
Reinsurance recoverable on unpaid losses and allocated loss settlement expenses 9,043      
Commercial automobile        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net outstanding liabilities for unpaid losses and allocated loss settlement expenses 256,254      
Reinsurance recoverable on unpaid losses and allocated loss settlement expenses (816)      
Commercial workers' compensation        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net outstanding liabilities for unpaid losses and allocated loss settlement expenses 74,006      
Reinsurance recoverable on unpaid losses and allocated loss settlement expenses 26,624      
Personal        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net outstanding liabilities for unpaid losses and allocated loss settlement expenses 9,866      
All other lines        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net outstanding liabilities for unpaid losses and allocated loss settlement expenses 330,342      
Reinsurance recoverable on unpaid losses and allocated loss settlement expenses $ 69,664