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

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- Definition Non-Catastrophe Prior Year Claims and Claims Adjustment Expense + References No definition available. + Details
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Namespace Prefix: | ufcs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration