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SUMMARY OF INVESTMENTS (Maturities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Held-To-Maturity, Amortized Cost    
Cost or Amortized Cost $ 397us-gaap_HeldToMaturitySecurities $ 656us-gaap_HeldToMaturitySecurities
Held-To-Maturity, Fair Value    
Fair Value 404us-gaap_HeldToMaturitySecuritiesFairValue 669us-gaap_HeldToMaturitySecuritiesFairValue
Available-For-Sale, Amortized Cost    
Amortized Cost 2,845,217us-gaap_AvailableForSaleSecuritiesAmortizedCost 2,804,514us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available-For-Sale, Fair Value    
Fair Value 3,088,922us-gaap_AvailableForSaleSecurities 2,980,624us-gaap_AvailableForSaleSecurities
Trading, Fair Value    
Fair Value 16,862us-gaap_TradingSecuritiesDebt 9,940us-gaap_TradingSecuritiesDebt
Asset-Backed Securities [Member]    
Available-For-Sale, Amortized Cost    
Amortized Cost 2,741us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
3,719us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
Available-For-Sale, Fair Value    
Fair Value 3,018us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
3,995us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
Mortgage Backed Securities [Member]    
Held-To-Maturity, Amortized Cost    
Cost or Amortized Cost 142us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
206us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Held-To-Maturity, Fair Value    
Fair Value 149us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
215us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Available-For-Sale, Amortized Cost    
Amortized Cost 17,121us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
22,034us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Available-For-Sale, Fair Value    
Fair Value 17,558us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
22,066us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Collateralized Mortgage Obligations [Member]    
Available-For-Sale, Amortized Cost    
Amortized Cost 335,092us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
309,975us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
Available-For-Sale, Fair Value    
Fair Value 337,289us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
294,763us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
Fixed Maturities [Member]    
Held-To-Maturity, Amortized Cost    
Due in one year or less 55us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
 
Due after one year through five years 200us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
 
Due after five years through 10 years 0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
 
Due after 10 years 0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
 
Cost or Amortized Cost 397us-gaap_HeldToMaturitySecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
 
Held-To-Maturity, Fair Value    
Due in one year or less 55us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
 
Due after one year through five years 200us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
 
Due after five years through 10 years 0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
 
Due after 10 years 0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
 
Fair Value 404us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
 
Available-For-Sale, Amortized Cost    
Due in one year or less 271,298us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
 
Due after one year through five years 838,504us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
 
Due after five years through 10 years 813,205us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
 
Due after 10 years 495,605us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
 
Amortized Cost 2,773,566us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
 
Available-For-Sale, Fair Value    
Due in one year or less 274,748us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
 
Due after one year through five years 875,291us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
 
Due after five years through 10 years 831,253us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
 
Due after 10 years 503,922us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
 
Fair Value 2,843,079us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
 
Trading, Amortized Cost    
Due in one year or less 2,783ufcs_TradingSecuritiesDebtMaturitiesWithinOneYearAmortizedCostBasis
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
 
Due after one year through five years 6,157ufcs_TradingSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCostBasis
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
 
Due after five years through 10 years 1,894ufcs_TradingSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCostBasis
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
 
Due after 10 years 3,529ufcs_TradingSecuritiesDebtMaturitiesAfterTenYearsAmortizedCostBasis
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
 
Amortized Cost 14,363ufcs_TradingSecuritiesAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
 
Trading, Fair Value    
Due in one year or less 3,437ufcs_TradingSecuritiesDebtMaturitiesWithinOneYearFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
 
Due after one year through five years 6,685ufcs_TradingSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
 
Due after five years through 10 years 2,322ufcs_TradingSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
 
Due after 10 years 4,418ufcs_TradingSecuritiesDebtMaturitiesAfterTenYearsFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
 
Fair Value 16,862us-gaap_TradingSecuritiesDebt
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
 
Fixed Maturities [Member] | Asset-Backed Securities [Member]    
Held-To-Maturity, Amortized Cost    
Not categorized by contractual maturity 0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateNetCarryingAmount
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
 
Held-To-Maturity, Fair Value    
Not categorized by contractual maturity 0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
 
Available-For-Sale, Amortized Cost    
Not categorized by contractual maturity 2,741us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
 
Available-For-Sale, Fair Value    
Not categorized by contractual maturity 3,018us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
 
Fixed Maturities [Member] | Mortgage Backed Securities [Member]    
Held-To-Maturity, Amortized Cost    
Not categorized by contractual maturity 142us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateNetCarryingAmount
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
 
Held-To-Maturity, Fair Value    
Not categorized by contractual maturity 149us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
 
Available-For-Sale, Amortized Cost    
Not categorized by contractual maturity 17,121us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
 
Available-For-Sale, Fair Value    
Not categorized by contractual maturity 17,558us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
 
Fixed Maturities [Member] | Collateralized Mortgage Obligations [Member]    
Held-To-Maturity, Amortized Cost    
Not categorized by contractual maturity 0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateNetCarryingAmount
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
 
Held-To-Maturity, Fair Value    
Not categorized by contractual maturity 0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
 
Available-For-Sale, Amortized Cost    
Not categorized by contractual maturity 335,092us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
 
Available-For-Sale, Fair Value    
Not categorized by contractual maturity $ 337,289us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember