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Schedule II. Condensed Financial Information of Registrant (Details 1) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Income    
Net realized investment gains (losses) $ 100us-gaap_RealizedInvestmentGainsLosses $ 4,439us-gaap_RealizedInvestmentGainsLosses
Other income 560us-gaap_OtherIncome 609us-gaap_OtherIncome
Total Revenues 64,307us-gaap_Revenues 61,160us-gaap_Revenues
Expenses    
Interest expense 1,521us-gaap_InterestExpense 1,686us-gaap_InterestExpense
Income tax expense (1,759)us-gaap_IncomeTaxExpenseBenefit (1,665)us-gaap_IncomeTaxExpenseBenefit
Parent Company [Member]    
Income    
Dividends (eliminated upon consolidation) 2,500us-gaap_DividendIncomeOperating
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,250us-gaap_DividendIncomeOperating
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Property transfer from subsidiary 0nsec_PropertyTransferFromSubsidiary
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0nsec_PropertyTransferFromSubsidiary
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net realized investment gains (losses) 1us-gaap_RealizedInvestmentGainsLosses
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
3,308us-gaap_RealizedInvestmentGainsLosses
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Holding company management service fees 958us-gaap_ManagementFeesRevenue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
929us-gaap_ManagementFeesRevenue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Other income 76us-gaap_OtherIncome
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
76us-gaap_OtherIncome
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Total Revenues 3,535us-gaap_Revenues
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
5,563us-gaap_Revenues
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Expenses    
State taxes 43us-gaap_CurrentStateAndLocalTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
41us-gaap_CurrentStateAndLocalTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Interest expense 1,455us-gaap_InterestExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,609us-gaap_InterestExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Other expenses 439us-gaap_OtherExpenses
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
684us-gaap_OtherExpenses
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Operating Expenses 1,937us-gaap_OperatingExpenses
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
2,334us-gaap_OperatingExpenses
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Income (loss) before income taxes and equity in undistributed earnings of subsidiaries 1,598us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
3,229us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Income tax expense (33)us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(672)us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Income before equity in undistributed earnings of subsidiaries 1,565nsec_IncomeBeforeIncomeTaxesAndUndistributedEarningsLossOfSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
2,557nsec_IncomeBeforeIncomeTaxesAndUndistributedEarningsLossOfSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Equity in undistributed earnings of subsidiaries 6,051nsec_EquityInUndistributedEarningsOfSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
3,101nsec_EquityInUndistributedEarningsOfSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net income $ 7,616us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
$ 5,658us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember