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SEGMENT INFORMATION (Net Premiums) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting, Revenue Reconciling Item [Line Items]      
Total net premium earned $ 828,330us-gaap_PremiumsEarnedNet $ 754,846us-gaap_PremiumsEarnedNet $ 694,994us-gaap_PremiumsEarnedNet
Property and Casualty Insurance Segment [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Reinsurance assumed 16,265us-gaap_AssumedPremiumsEarned
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember		 18,485us-gaap_AssumedPremiumsEarned
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember		 16,889us-gaap_AssumedPremiumsEarned
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Other 3,735us-gaap_PremiumsEarnedNetOtherInsurance
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember		 2,635us-gaap_PremiumsEarnedNetOtherInsurance
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember		 1,919us-gaap_PremiumsEarnedNetOtherInsurance
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Property and Casualty Insurance Segment [Member] | Fire and Allied Lines [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Net premiums earned 226,086ufcs_DirectedPremiumEarnedNetOfCededPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= ufcs_FireAndAlliedLinesInsuranceMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember		 208,030ufcs_DirectedPremiumEarnedNetOfCededPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= ufcs_FireAndAlliedLinesInsuranceMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember		 173,249ufcs_DirectedPremiumEarnedNetOfCededPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= ufcs_FireAndAlliedLinesInsuranceMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Property and Casualty Insurance Segment [Member] | Other Liability [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Net premiums earned 228,426ufcs_DirectedPremiumEarnedNetOfCededPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= ufcs_OtherLiabilityInsuranceMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember		 199,548ufcs_DirectedPremiumEarnedNetOfCededPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= ufcs_OtherLiabilityInsuranceMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember		 197,842ufcs_DirectedPremiumEarnedNetOfCededPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= ufcs_OtherLiabilityInsuranceMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Property and Casualty Insurance Segment [Member] | Automobile [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Net premiums earned 187,813ufcs_DirectedPremiumEarnedNetOfCededPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= ufcs_AutomobileInsuranceMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember		 169,211ufcs_DirectedPremiumEarnedNetOfCededPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= ufcs_AutomobileInsuranceMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember		 155,572ufcs_DirectedPremiumEarnedNetOfCededPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= ufcs_AutomobileInsuranceMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Property and Casualty Insurance Segment [Member] | Workers' Compensation [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Net premiums earned 88,522ufcs_DirectedPremiumEarnedNetOfCededPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= ufcs_WorkersCompensationInsuranceMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember		 81,616ufcs_DirectedPremiumEarnedNetOfCededPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= ufcs_WorkersCompensationInsuranceMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember		 68,643ufcs_DirectedPremiumEarnedNetOfCededPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= ufcs_WorkersCompensationInsuranceMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Property and Casualty Insurance Segment [Member] | Fidelity and Surety [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Net premiums earned 19,212ufcs_DirectedPremiumEarnedNetOfCededPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= ufcs_FidelityAndSuretyInsuranceMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember		 18,746ufcs_DirectedPremiumEarnedNetOfCededPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= ufcs_FidelityAndSuretyInsuranceMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember		 17,713ufcs_DirectedPremiumEarnedNetOfCededPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= ufcs_FidelityAndSuretyInsuranceMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Property and Casualty Insurance Segment [Member] | Operating Segments [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Total net premium earned 766,939us-gaap_PremiumsEarnedNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember		 694,192us-gaap_PremiumsEarnedNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember		 629,411us-gaap_PremiumsEarnedNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Property and Casualty Insurance Segment [Member] | Reinsurance Assumed Line of Business [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Reinsurance assumed 13,145us-gaap_AssumedPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_ReinsuranceAssumedLineofBusinessMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember		 14,406us-gaap_AssumedPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_ReinsuranceAssumedLineofBusinessMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember		 14,473us-gaap_AssumedPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_ReinsuranceAssumedLineofBusinessMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Life Insurance Segment [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Other 261us-gaap_PremiumsEarnedNetOtherInsurance
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember		 261us-gaap_PremiumsEarnedNetOtherInsurance
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember		 274us-gaap_PremiumsEarnedNetOtherInsurance
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember
Life Insurance Segment [Member] | Ordinary Life (Excluding Universal Life) [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Total net premium earned 35,557us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= ufcs_OrdinaryLifeMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember		 38,875us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= ufcs_OrdinaryLifeMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember		 44,468us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= ufcs_OrdinaryLifeMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember
Life Insurance Segment [Member] | Universal Life Policy Fees [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Total net premium earned 13,190us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_UniversalLifeMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember		 11,871us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_UniversalLifeMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember		 11,768us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_UniversalLifeMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember
Life Insurance Segment [Member] | Accident and Health [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Total net premium earned 1,274us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_AccidentAndHealthInsuranceSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember		 1,302us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_AccidentAndHealthInsuranceSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember		 1,363us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_AccidentAndHealthInsuranceSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember
Life Insurance Segment [Member] | Immediate Annuities with Life Contingencies [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Total net premium earned 11,639us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= ufcs_ImmediateAnnuitiesWithLifeContingenciesMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember		 8,837us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= ufcs_ImmediateAnnuitiesWithLifeContingenciesMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember		 8,158us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= ufcs_ImmediateAnnuitiesWithLifeContingenciesMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember
Life Insurance Segment [Member] | Operating Segments [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Total net premium earned $ 61,921us-gaap_PremiumsEarnedNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember		 $ 61,146us-gaap_PremiumsEarnedNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember		 $ 66,031us-gaap_PremiumsEarnedNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember