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CREDIT FACILITY (Details) (USD $)
12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2011
Dec. 31, 2012
Jun. 04, 2013
Line of Credit Facility [Line Items]          
Interest expense incurred $ 0us-gaap_InterestExpense $ 0us-gaap_InterestExpense      
Credit Facility [Member]          
Line of Credit Facility [Line Items]          
Credit agreement term     4 years    
Current borrowing capacity     100,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
  100,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
Maximum borrowing capacity 125,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
      125,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
Outstanding balance 0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
     
Interest expense incurred       780,000us-gaap_InterestExpense
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
 
Letter of Credit [Member]          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity     20,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
   
Swing Line Subfacility [Member]          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity     $ 5,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= ufcs_SwingLineOfCreditMember