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Schedule II. Condensed Financial Information of Registrant (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Adjustments to reconcile net income to net cash provided by (used in)operating activities:    
Net realized gains on investments $ (100)us-gaap_RealizedInvestmentGainsLosses $ (4,439)us-gaap_RealizedInvestmentGainsLosses
Deferred income tax expense (benefit) 519us-gaap_DeferredIncomeTaxExpenseBenefit 1,573us-gaap_DeferredIncomeTaxExpenseBenefit
Other Noncash Income (Expense) 15us-gaap_OtherNoncashIncomeExpense 233us-gaap_OtherNoncashIncomeExpense
Net cash provided by operating activities 11,867us-gaap_NetCashProvidedByUsedInOperatingActivities 2,659us-gaap_NetCashProvidedByUsedInOperatingActivities
Net Cash Provided by (Used in) Investing Activities [Abstract]    
Net cash used in investing activities (7,008)us-gaap_NetCashProvidedByUsedInInvestingActivities (357)us-gaap_NetCashProvidedByUsedInInvestingActivities
Net Cash Provided by (Used in) Financing Activities [Abstract]    
Net cash used in financing activities (3,420)us-gaap_NetCashProvidedByUsedInFinancingActivities (4,094)us-gaap_NetCashProvidedByUsedInFinancingActivities
Net increase (decrease) in cash and cash equivalents 1,439us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (1,792)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of year 4,987us-gaap_CashAndCashEquivalentsAtCarryingValue 6,779us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of year 6,426us-gaap_CashAndCashEquivalentsAtCarryingValue 4,987us-gaap_CashAndCashEquivalentsAtCarryingValue
Parent Company [Member]    
Condensed Financial Statements, Captions [Line Items]    
Net income 7,616us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
5,658us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Adjustments to reconcile net income to net cash provided by (used in)operating activities:    
Equity in undistributed earnings of subsidiaries (6,051)nsec_EquityInUndistributedEarningsOfSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(3,101)nsec_EquityInUndistributedEarningsOfSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net realized gains on investments (1)us-gaap_RealizedInvestmentGainsLosses
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(3,308)us-gaap_RealizedInvestmentGainsLosses
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Deferred income tax expense (benefit) 975us-gaap_DeferredIncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
672us-gaap_DeferredIncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Other Noncash Income (Expense) 267us-gaap_OtherNoncashIncomeExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
246us-gaap_OtherNoncashIncomeExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net cash provided by operating activities 2,806us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
167us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net Cash Provided by (Used in) Investing Activities [Abstract]    
Net sales (purchases) of investments 0nsec_SalePurchasesofInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(4,847)nsec_SalePurchasesofInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net cash used in investing activities 0us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4,847us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net Cash Provided by (Used in) Financing Activities [Abstract]    
Net (repayments) proceeds from debt (3,183)us-gaap_ProceedsFromRepaymentsOfNotesPayable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(3,876)us-gaap_ProceedsFromRepaymentsOfNotesPayable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash dividends (300)us-gaap_PaymentsOfDividends
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(248)us-gaap_PaymentsOfDividends
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net cash used in financing activities (3,483)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(4,124)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net increase (decrease) in cash and cash equivalents (677)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
890us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash and cash equivalents, beginning of year 948us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
58us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash and cash equivalents, end of year $ 271us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
$ 948us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember