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REINSURANCE (Reinsurance Programs) (Details) (Property and Casualty Insurance [Member], USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Casualty Excess of Loss [Member]
     
Reinsurance [Line Items]      
Stated Retention $ 2,000,000ufcs_ReinsuranceStatedRetentionAmountPerIncident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_CasualtyMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
$ 2,000,000ufcs_ReinsuranceStatedRetentionAmountPerIncident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_CasualtyMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
$ 2,000,000ufcs_ReinsuranceStatedRetentionAmountPerIncident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_CasualtyMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Limits 40,000,000ufcs_ReinsuranceMaximumInsuranceCoveragePerIndident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_CasualtyMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
40,000,000ufcs_ReinsuranceMaximumInsuranceCoveragePerIndident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_CasualtyMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
40,000,000ufcs_ReinsuranceMaximumInsuranceCoveragePerIndident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_CasualtyMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Percentage of Coverage 100.00%ufcs_ReinsurancePercentageOfCoverage
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_CasualtyMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
100.00%ufcs_ReinsurancePercentageOfCoverage
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_CasualtyMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
100.00%ufcs_ReinsurancePercentageOfCoverage
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_CasualtyMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Reinsurance Coverage Amount 38,000,000ufcs_ReinsuranceCoverageAmountPerIncident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_CasualtyMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
38,000,000ufcs_ReinsuranceCoverageAmountPerIncident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_CasualtyMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
38,000,000ufcs_ReinsuranceCoverageAmountPerIncident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_CasualtyMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Property Excess of Loss [Member]
     
Reinsurance [Line Items]      
Stated Retention 2,000,000ufcs_ReinsuranceStatedRetentionAmountPerIncident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_PropertyMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
2,000,000ufcs_ReinsuranceStatedRetentionAmountPerIncident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_PropertyMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
2,000,000ufcs_ReinsuranceStatedRetentionAmountPerIncident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_PropertyMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Limits 15,000,000ufcs_ReinsuranceMaximumInsuranceCoveragePerIndident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_PropertyMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
15,000,000ufcs_ReinsuranceMaximumInsuranceCoveragePerIndident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_PropertyMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
15,000,000ufcs_ReinsuranceMaximumInsuranceCoveragePerIndident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_PropertyMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Percentage of Coverage 100.00%ufcs_ReinsurancePercentageOfCoverage
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_PropertyMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
100.00%ufcs_ReinsurancePercentageOfCoverage
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_PropertyMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
100.00%ufcs_ReinsurancePercentageOfCoverage
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_PropertyMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Reinsurance Coverage Amount 13,000,000ufcs_ReinsuranceCoverageAmountPerIncident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_PropertyMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
13,000,000ufcs_ReinsuranceCoverageAmountPerIncident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_PropertyMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
13,000,000ufcs_ReinsuranceCoverageAmountPerIncident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_PropertyMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Surety Excess of Loss [Member]
     
Reinsurance [Line Items]      
Stated Retention 1,500,000ufcs_ReinsuranceStatedRetentionAmountPerIncident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_SuretyMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
1,500,000ufcs_ReinsuranceStatedRetentionAmountPerIncident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_SuretyMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
1,500,000ufcs_ReinsuranceStatedRetentionAmountPerIncident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_SuretyMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Limits 28,000,000ufcs_ReinsuranceMaximumInsuranceCoveragePerIndident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_SuretyMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
28,000,000ufcs_ReinsuranceMaximumInsuranceCoveragePerIndident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_SuretyMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
28,000,000ufcs_ReinsuranceMaximumInsuranceCoveragePerIndident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_SuretyMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Percentage of Coverage 91.00%ufcs_ReinsurancePercentageOfCoverage
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_SuretyMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
91.00%ufcs_ReinsurancePercentageOfCoverage
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_SuretyMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
91.00%ufcs_ReinsurancePercentageOfCoverage
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_SuretyMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Reinsurance Coverage Amount 26,500,000ufcs_ReinsuranceCoverageAmountPerIncident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_SuretyMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
26,500,000ufcs_ReinsuranceCoverageAmountPerIncident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_SuretyMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
26,500,000ufcs_ReinsuranceCoverageAmountPerIncident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_SuretyMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Property Catastrophe [Member]
     
Reinsurance [Line Items]      
Stated Retention 20,000,000ufcs_ReinsuranceStatedRetentionAmountPerIncident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_PropertyCatastropheMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
20,000,000ufcs_ReinsuranceStatedRetentionAmountPerIncident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_PropertyCatastropheMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
20,000,000ufcs_ReinsuranceStatedRetentionAmountPerIncident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_PropertyCatastropheMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Limits 200,000,000ufcs_ReinsuranceMaximumInsuranceCoveragePerIndident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_PropertyCatastropheMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
200,000,000ufcs_ReinsuranceMaximumInsuranceCoveragePerIndident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_PropertyCatastropheMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
200,000,000ufcs_ReinsuranceMaximumInsuranceCoveragePerIndident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_PropertyCatastropheMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Percentage of Coverage 100.00%ufcs_ReinsurancePercentageOfCoverage
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_PropertyCatastropheMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
95.00%ufcs_ReinsurancePercentageOfCoverage
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_PropertyCatastropheMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
95.00%ufcs_ReinsurancePercentageOfCoverage
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_PropertyCatastropheMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Reinsurance Coverage Amount 180,000,000ufcs_ReinsuranceCoverageAmountPerIncident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_PropertyCatastropheMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
180,000,000ufcs_ReinsuranceCoverageAmountPerIncident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_PropertyCatastropheMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
180,000,000ufcs_ReinsuranceCoverageAmountPerIncident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_PropertyCatastropheMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Property Catastrophe [Member]
     
Reinsurance [Line Items]      
Stated Retention 200,000,000ufcs_ReinsuranceStatedRetentionAmountPerIncident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_PropertyCatastropheTwoMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
   
Limits 250,000,000ufcs_ReinsuranceMaximumInsuranceCoveragePerIndident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_PropertyCatastropheTwoMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
   
Percentage of Coverage 90.50%ufcs_ReinsurancePercentageOfCoverage
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_PropertyCatastropheTwoMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
   
Reinsurance Coverage Amount 50,000,000ufcs_ReinsuranceCoverageAmountPerIncident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_PropertyCatastropheTwoMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
   
Boiler and Machinery [Member]
     
Reinsurance [Line Items]      
Limits 50,000,000ufcs_ReinsuranceMaximumInsuranceCoveragePerIndident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_BoilerAndMachineryMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
50,000,000ufcs_ReinsuranceMaximumInsuranceCoveragePerIndident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_BoilerAndMachineryMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
50,000,000ufcs_ReinsuranceMaximumInsuranceCoveragePerIndident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_BoilerAndMachineryMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Percentage of Coverage 100.00%ufcs_ReinsurancePercentageOfCoverage
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_BoilerAndMachineryMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
100.00%ufcs_ReinsurancePercentageOfCoverage
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_BoilerAndMachineryMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
100.00%ufcs_ReinsurancePercentageOfCoverage
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_BoilerAndMachineryMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Reinsurance Coverage Amount $ 50,000,000ufcs_ReinsuranceCoverageAmountPerIncident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_BoilerAndMachineryMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
$ 50,000,000ufcs_ReinsuranceCoverageAmountPerIncident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_BoilerAndMachineryMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
$ 50,000,000ufcs_ReinsuranceCoverageAmountPerIncident
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ufcs_BoilerAndMachineryMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember