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Investments (Details 7) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Other-Than-Temporary Impairments      
Other than temporary Impairments $ 55us-gaap_ImpairmentOfInvestments $ 1,969us-gaap_ImpairmentOfInvestments $ 53us-gaap_ImpairmentOfInvestments
OTTI recognized in earnings 24us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities 1,865us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities 53us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities
Portion of net (gain) loss recognize in other comprehensive loss, before taxes 31us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAvailableforsaleSecurities 104us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAvailableforsaleSecurities 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAvailableforsaleSecurities
Fixed maturity securities      
Other-Than-Temporary Impairments      
OTTI recognized in earnings 24us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
1,865us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
14us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
Credit loss impairments on fixed maturity securities for which a portion of the OTTI loss was recognized in AOCI      
Balance, beginning of year 14,164us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
26,970us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
29,374us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
Additions for credit loss impairments recognized in the current period on securities previously impaired 24us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
87us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
14us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
Reductions for increases in cash flows expected to be collected that are recognized over the remaining life of the security (461)us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCashFlows
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
(123)us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCashFlows
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
(403)us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCashFlows
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
Reductions for credit loss impairments previously recognized on securities which matured, paid down, prepaid or were sold during the period (260)usic_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesMaturedPaidDownPrepaidOrSold
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
(12,770)usic_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesMaturedPaidDownPrepaidOrSold
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
(2,015)usic_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesMaturedPaidDownPrepaidOrSold
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
Balance, end of year $ 13,467us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
$ 14,164us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
$ 26,970us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember