Fair Value of Financial Instruments - Narrative (Details) - security	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Number of securities transferred out of level 3	2	2
Number of securities transferred into level 3	1	1

Number Of Securities Transferred Out Of Level Three

No definition available.

Name:	ufcs_NumberOfSecuritiesTransferredOutOfLevelThree
Namespace Prefix:	ufcs_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration