RESERVES FOR LOSSES AND LOSS SETTLEMENT EXPENSES - Narrative (Details) $ in Millions	12 Months Ended
Dec. 31, 2025 USD ($)
Insurance [Abstract]
Favorable prior year development for non-catastrophe	$ 5.2

Non-Catastrophe Prior Year Claims and Claims Adjustment Expense

No definition available.

Name:	ufcs_NonCatastrophePriorYearClaimsAndClaimsAdjustmentExpense
Namespace Prefix:	ufcs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration