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Investments (Major Categories of Investment Income) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Gross investment income $ 4,019nsec_GrossInvestmentIncome $ 3,986nsec_GrossInvestmentIncome
Less: Investment expenses 281us-gaap_InvestmentIncomeInvestmentExpense 240us-gaap_InvestmentIncomeInvestmentExpense
Net investment income 3,738us-gaap_NetInvestmentIncome 3,746us-gaap_NetInvestmentIncome
Fixed Maturities [Member]    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Gross investment income 3,428nsec_GrossInvestmentIncome
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_FixedMaturitiesMember		 3,351nsec_GrossInvestmentIncome
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_FixedMaturitiesMember
Equity Securities [Member]    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Gross investment income 117nsec_GrossInvestmentIncome
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_EquitySecuritiesMember		 137nsec_GrossInvestmentIncome
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_EquitySecuritiesMember
Mortgage Loans on Real Estate [Member]    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Gross investment income 16nsec_GrossInvestmentIncome
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_MortgageLoansOnRealEstateMember		 22nsec_GrossInvestmentIncome
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_MortgageLoansOnRealEstateMember
Investment Real Estate [Member]    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Gross investment income 12nsec_GrossInvestmentIncome
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_RealEstateInvestmentMember		 8nsec_GrossInvestmentIncome
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_RealEstateInvestmentMember
Policy Loans [Member]    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Gross investment income 113nsec_GrossInvestmentIncome
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_PolicyLoansMember		 104nsec_GrossInvestmentIncome
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_PolicyLoansMember
Company Owned Life Insurance [Member]    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Gross investment income 68nsec_GrossInvestmentIncome
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= nsec_CompanyOwnedLifeInsuranceMember		 (73)nsec_GrossInvestmentIncome
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= nsec_CompanyOwnedLifeInsuranceMember
Other, Principally Short-term Investments [Member]    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Gross investment income $ 265nsec_GrossInvestmentIncome
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= nsec_OtherPrincipallyShortTermInvestmentsMember		 $ 437nsec_GrossInvestmentIncome
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= nsec_OtherPrincipallyShortTermInvestmentsMember