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Schedule I-Summary of Investments Other-Than-Investments in Related Parties (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Summary of Investments Other-Than-Investments in Related Parties    
Cost or Amortized Cost $ 120,258us-gaap_AvailableForSaleSecuritiesAmortizedCost  
Fair Value 135,394us-gaap_AvailableForSaleSecurities  
Amount at which shown in balance sheet 132,800us-gaap_Investments 138,701us-gaap_Investments
Fixed maturity securities    
Summary of Investments Other-Than-Investments in Related Parties    
Cost or Amortized Cost 85,562us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_FixedMaturitiesMember
 
Fair Value 97,469us-gaap_AvailableForSaleSecurities
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_FixedMaturitiesMember
 
Amount at which shown in balance sheet 97,469us-gaap_Investments
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_FixedMaturitiesMember
 
United States Government and government agencies and authorities    
Summary of Investments Other-Than-Investments in Related Parties    
Cost or Amortized Cost 608us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_USTreasuryAndGovernmentMember
 
Fair Value 797us-gaap_AvailableForSaleSecurities
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_USTreasuryAndGovernmentMember
 
Amount at which shown in balance sheet 797us-gaap_Investments
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_USTreasuryAndGovernmentMember
 
States, municipalities and political subdivisions    
Summary of Investments Other-Than-Investments in Related Parties    
Cost or Amortized Cost 26,614us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
 
Fair Value 28,918us-gaap_AvailableForSaleSecurities
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
 
Amount at which shown in balance sheet 28,918us-gaap_Investments
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
 
Foreign governments    
Summary of Investments Other-Than-Investments in Related Parties    
Cost or Amortized Cost 255us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
 
Fair Value 376us-gaap_AvailableForSaleSecurities
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
 
Amount at which shown in balance sheet 376us-gaap_Investments
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
 
Commercial mortgage-backed    
Summary of Investments Other-Than-Investments in Related Parties    
Cost or Amortized Cost 470us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
 
Fair Value 499us-gaap_AvailableForSaleSecurities
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
 
Amount at which shown in balance sheet 499us-gaap_Investments
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
 
Residential mortgage-backed    
Summary of Investments Other-Than-Investments in Related Parties    
Cost or Amortized Cost 6,653us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
 
Fair Value 7,701us-gaap_AvailableForSaleSecurities
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
 
Amount at which shown in balance sheet 7,701us-gaap_Investments
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
 
Corporate    
Summary of Investments Other-Than-Investments in Related Parties    
Cost or Amortized Cost 50,962us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_CorporateDebtSecuritiesMember
 
Fair Value 59,178us-gaap_AvailableForSaleSecurities
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_CorporateDebtSecuritiesMember
 
Amount at which shown in balance sheet 59,178us-gaap_Investments
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_CorporateDebtSecuritiesMember
 
Non-redeemable preferred stocks    
Summary of Investments Other-Than-Investments in Related Parties    
Cost or Amortized Cost 7,333us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_NonredeemablePreferredStockMember
 
Fair Value 7,968us-gaap_AvailableForSaleSecurities
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_NonredeemablePreferredStockMember
 
Amount at which shown in balance sheet 7,968us-gaap_Investments
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_NonredeemablePreferredStockMember
 
Commercial mortgage loans on real estate, at amortized cost    
Summary of Investments Other-Than-Investments in Related Parties    
Cost or Amortized Cost 19,772us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= uslic_CommercialMortgageLoansOnRealEstateMember
 
Fair Value 22,366us-gaap_AvailableForSaleSecurities
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= uslic_CommercialMortgageLoansOnRealEstateMember
 
Amount at which shown in balance sheet 19,772us-gaap_Investments
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= uslic_CommercialMortgageLoansOnRealEstateMember
 
Policy loans    
Summary of Investments Other-Than-Investments in Related Parties    
Cost or Amortized Cost 217us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_PolicyLoansMember
 
Fair Value 217us-gaap_AvailableForSaleSecurities
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_PolicyLoansMember
 
Amount at which shown in balance sheet 217us-gaap_Investments
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_PolicyLoansMember
 
Short-term investments    
Summary of Investments Other-Than-Investments in Related Parties    
Cost or Amortized Cost 7,202us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_ShortTermInvestmentsMember
 
Fair Value 7,202us-gaap_AvailableForSaleSecurities
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_ShortTermInvestmentsMember
 
Amount at which shown in balance sheet 7,202us-gaap_Investments
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_ShortTermInvestmentsMember
 
Other investments.    
Summary of Investments Other-Than-Investments in Related Parties    
Cost or Amortized Cost 172us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_OtherInvestmentsMember
 
Fair Value 172us-gaap_AvailableForSaleSecurities
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_OtherInvestmentsMember
 
Amount at which shown in balance sheet $ 172us-gaap_Investments
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_OtherInvestmentsMember