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EMPLOYEE BENEFITS (Narratives) (Details) (Pension Plan [Member], USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
investment_manager
Pension Plan [Member]
  
Defined Benefit Plan Disclosure [Line Items]  
Eligibility, minimum required service period 1 year
Eligibility, minimum age 21 years
Estimated employer contribution in next fiscal year $ 6,352us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Number of exernal investment managers 6ufcs_DefinedBenefitPlanPlanAssetsNumberOfExernalInvestmentManagers
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember