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SUMMARY OF INVESTMENTS (Unrealized Appreciation and Depreciation) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Unrealized Gain (Loss) on Investments [Abstract]      
Available-for-sale fixed maturities $ 51,814ufcs_AvailableForSaleSecuritiesFixedMaturitiesChangeInNetUnrealizedHoldingGainLossBeforeTax $ (132,579)ufcs_AvailableForSaleSecuritiesFixedMaturitiesChangeInNetUnrealizedHoldingGainLossBeforeTax $ 15,816ufcs_AvailableForSaleSecuritiesFixedMaturitiesChangeInNetUnrealizedHoldingGainLossBeforeTax
Equity securities 15,781ufcs_EquitySecuritiesChangeInNetUnrealizedHoldingGainLossBeforeTax 48,176ufcs_EquitySecuritiesChangeInNetUnrealizedHoldingGainLossBeforeTax 19,339ufcs_EquitySecuritiesChangeInNetUnrealizedHoldingGainLossBeforeTax
Deferred policy acquisition costs (16,789)us-gaap_DeferredPolicyAcquisitionCostAmortizationExpenseUnrealizedInvestmentGainsLosses 42,102us-gaap_DeferredPolicyAcquisitionCostAmortizationExpenseUnrealizedInvestmentGainsLosses (4,821)us-gaap_DeferredPolicyAcquisitionCostAmortizationExpenseUnrealizedInvestmentGainsLosses
Income tax effect (17,784)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax 14,806us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax (10,614)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Total change in net unrealized investment appreciation, net of tax $ 33,022us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax $ (27,495)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax $ 19,720us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax