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STOCK-BASED COMPENSATION (Stock Award Plans) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended 79 Months Ended 120 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award Available for Grant [Roll Forward]          
Number of option awards exercised (in shares) 102,914us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised        
Stock-based compensation expense $ 1,944us-gaap_ShareBasedCompensation $ 1,777us-gaap_ShareBasedCompensation $ 1,764us-gaap_ShareBasedCompensation    
Stock-Basec Compensation Expense [Abstract]          
2015 1,864ufcs_FutureShareBasedCompensationExpenseYearOne     1,864ufcs_FutureShareBasedCompensationExpenseYearOne 1,864ufcs_FutureShareBasedCompensationExpenseYearOne
2016 1,439ufcs_FutureShareBasedCompensationExpenseYearTwo     1,439ufcs_FutureShareBasedCompensationExpenseYearTwo 1,439ufcs_FutureShareBasedCompensationExpenseYearTwo
2017 1,200ufcs_FutureShareBasedCompensationExpenseYearThree     1,200ufcs_FutureShareBasedCompensationExpenseYearThree 1,200ufcs_FutureShareBasedCompensationExpenseYearThree
2018 778ufcs_FutureShareBasedCompensationExpenseYearFour     778ufcs_FutureShareBasedCompensationExpenseYearFour 778ufcs_FutureShareBasedCompensationExpenseYearFour
2019 90ufcs_FutureShareBasedCompensationExpenseYearFive     90ufcs_FutureShareBasedCompensationExpenseYearFive 90ufcs_FutureShareBasedCompensationExpenseYearFive
Total 5,371us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized     5,371us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized 5,371us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Restricted Stock Awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award Available for Grant [Roll Forward]          
Number of restricted stock awards vested (in shares) 5,040us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		        
Stock-based compensation expense $ 588us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 $ 407us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 $ 329us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		    
Employee Stock Award Plan-2008 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of opton awards vest and exercisable in installments 20.00%ufcs_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsPercengageVestedAndExercisableEachYear
/ us-gaap_PlanNameAxis
= ufcs_EmployeeStockAwardPlan2008Member		        
Award expiration term 10 years        
Share-based Compensation Arrangement by Share-based Payment Award Available for Grant [Roll Forward]          
Beginning balance (in shares) 353,649us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ufcs_EmployeeStockAwardPlan2008Member		     1,900,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ufcs_EmployeeStockAwardPlan2008Member		  
Additional shares authorized 1,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
/ us-gaap_PlanNameAxis
= ufcs_EmployeeStockAwardPlan2008Member		     1,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
/ us-gaap_PlanNameAxis
= ufcs_EmployeeStockAwardPlan2008Member		  
Number of awards granted (in shares) (314,013)ufcs_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= ufcs_EmployeeStockAwardPlan2008Member		     (1,996,509)ufcs_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= ufcs_EmployeeStockAwardPlan2008Member		  
Number of awards forfeited or expired (in shares) 107,311ufcs_ShareBasedCompensationArrangementByShareBasedPaymentAwardForfeituresAndExpirationInPeriod
/ us-gaap_PlanNameAxis
= ufcs_EmployeeStockAwardPlan2008Member		     243,456ufcs_ShareBasedCompensationArrangementByShareBasedPaymentAwardForfeituresAndExpirationInPeriod
/ us-gaap_PlanNameAxis
= ufcs_EmployeeStockAwardPlan2008Member		  
Ending balance (in shares) 1,646,947us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ufcs_EmployeeStockAwardPlan2008Member		     1,646,947us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ufcs_EmployeeStockAwardPlan2008Member		 1,646,947us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ufcs_EmployeeStockAwardPlan2008Member
Employee Stock Award Plan-2008 [Member] | Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award Available for Grant [Roll Forward]          
Number of option awards exercised (in shares) 85,795us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= ufcs_EmployeeStockAwardPlan2008Member		     467,563us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= ufcs_EmployeeStockAwardPlan2008Member		  
Employee Stock Award Plan-2008 [Member] | Unrestricted Stock Awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award Available for Grant [Roll Forward]          
Number of awards granted (in shares) (725)ufcs_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= ufcs_UnrestrictedStockAwardsMember
/ us-gaap_PlanNameAxis
= ufcs_EmployeeStockAwardPlan2008Member		     (5,280)ufcs_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= ufcs_UnrestrictedStockAwardsMember
/ us-gaap_PlanNameAxis
= ufcs_EmployeeStockAwardPlan2008Member		  
Employee Stock Award Plan-2008 [Member] | Restricted Stock Awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period of restricted stock awards 5 years        
Share-based Compensation Arrangement by Share-based Payment Award Available for Grant [Roll Forward]          
Number of restricted stock awards vested (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= ufcs_EmployeeStockAwardPlan2008Member		     18,576us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= ufcs_EmployeeStockAwardPlan2008Member		  
Director Plan - 2005 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award Available for Grant [Roll Forward]          
Beginning balance (in shares) 103,912us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ufcs_DirectorPlan2005Member		       300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ufcs_DirectorPlan2005Member
Number of awards granted (in shares) (16,718)ufcs_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= ufcs_DirectorPlan2005Member		       (218,809)ufcs_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= ufcs_DirectorPlan2005Member
Number of awards forfeited or expired (in shares) 0ufcs_ShareBasedCompensationArrangementByShareBasedPaymentAwardForfeituresAndExpirationInPeriod
/ us-gaap_PlanNameAxis
= ufcs_DirectorPlan2005Member		       6,003ufcs_ShareBasedCompensationArrangementByShareBasedPaymentAwardForfeituresAndExpirationInPeriod
/ us-gaap_PlanNameAxis
= ufcs_DirectorPlan2005Member
Ending balance (in shares) 87,194us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ufcs_DirectorPlan2005Member		     87,194us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ufcs_DirectorPlan2005Member		 87,194us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ufcs_DirectorPlan2005Member
Director Plan - 2005 [Member] | Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award Available for Grant [Roll Forward]          
Number of option awards exercised (in shares) 1,519us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= ufcs_DirectorPlan2005Member		       4,675us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= ufcs_DirectorPlan2005Member
Director Plan - 2005 [Member] | Restricted Stock Awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award Available for Grant [Roll Forward]          
Number of restricted stock awards vested (in shares) 5,040us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= ufcs_DirectorPlan2005Member		       11,442us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= ufcs_DirectorPlan2005Member