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Nature of Operations and Basis of Presentation (Narratives) (Details) (USD $)
3 Months Ended
Mar. 31, 2015
segment
Mar. 31, 2014
Dec. 31, 2014
Segment Reporting Information [Line Items]      
Number of business segments 2us-gaap_NumberOfOperatingSegments    
Payment for income taxes $ 6,508,000us-gaap_IncomeTaxesPaid $ 1,007,000us-gaap_IncomeTaxesPaid  
Federal tax refund received 0us-gaap_ProceedsFromIncomeTaxRefunds 615,000us-gaap_ProceedsFromIncomeTaxRefunds  
Interest payments 0us-gaap_InterestPaid 0us-gaap_InterestPaid  
Decrease to other underwriting expenses 48,000ufcs_DeferredPolicyAcquisitionCostsChangeinOtherUnderwritingExpense    
Increase in DAC asset 728,000us-gaap_IncreaseDecreaseInDeferredPolicyAcquisitionCosts    
Increase (decrease) in DAC asset related to assumed realization of unrealized gains (losses) (20,294,000)ufcs_DeferredPolicyAcquisitionCostsPeriodIncreaseDecreaseDeferredAcquisitionCostOffsetAdjustmentRelatedToAssumedRealizationOfUnrealizedGainsLosses   13,383,000ufcs_DeferredPolicyAcquisitionCostsPeriodIncreaseDecreaseDeferredAcquisitionCostOffsetAdjustmentRelatedToAssumedRealizationOfUnrealizedGainsLosses
Federal income tax expense $ 8,152,000us-gaap_IncomeTaxExpenseBenefit $ 2,566,000us-gaap_IncomeTaxExpenseBenefit  
Federal statutory rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate  
Property and Casualty Insurance [Member]      
Segment Reporting Information [Line Items]      
Number of states in which we are licensed as insurer 43us-gaap_NumberOfStatesInWhichEntityOperates
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
   
Life Insurance [Member]      
Segment Reporting Information [Line Items]      
Number of states in which we are licensed as insurer 37us-gaap_NumberOfStatesInWhichEntityOperates
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember