Federal Income Tax - Narrative (Details) $ in Thousands	Mar. 27, 2020 USD ($)
Income Tax Disclosure [Abstract]
Income tax benefit, CARES Act	$ 18,562

Income Tax Expense (Benefit), Net Operating Loss, CARES Act

No definition available.

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