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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
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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 |  |  |

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