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Accumulated Other Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Accumulated Other Comprehensive Income and (Loss), Pre-Tax Amount, Beginning of period $ 150uihc_AccumulatedOtherComprehensiveIncomeAndLossBeforeTax $ 4,254uihc_AccumulatedOtherComprehensiveIncomeAndLossBeforeTax $ 3,812uihc_AccumulatedOtherComprehensiveIncomeAndLossBeforeTax $ 6,537uihc_AccumulatedOtherComprehensiveIncomeAndLossBeforeTax
Change in net unrealized gain (loss) on investments, Pre-Tax Amount 6,367us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax (4,233)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax 2,602us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax  
Reclassification adjustment for realized losses, Pre-Tax Amount 20us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax 129us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax (2,160)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax  
Deferred Tax Liabilities, Other Comprehensive Income   (1,641)us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome (1,471)us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome (2,526)us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome
Accumulated Other Comprehensive Income (Loss), Tax (Expense) Benefit   58uihc_AccumulatedOtherComprehensiveIncomeLossTaxExpenseBenefit    
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax (2,460)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax 1,633us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax (1,004)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax  
Reclassification adjustment for realized losses, Tax (Expense) Benefit (8)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax (50)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax 834us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax  
Accumulated Other Comprehensive Income (Loss), Net-of-Tax Amount, Beginning of period 92us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 2,613us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 2,341us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 4,011us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Change in net unrealized gain (loss) on investments, Net-of-Tax Amount 3,907us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax (2,600)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 1,598us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax  
Reclassification adjustment for realized losses, Net-of-Tax Amount $ 12us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax $ 79us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax $ (1,326)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax