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Employee Benefit Plans (Details) (USD $)
12 Months Ended 61 Months Ended
Dec. 31, 2014
hours
Dec. 31, 2013
Mar. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Minimum hours of service completed in year of contribution 1,000nsec_DefinedContributionPlanMinimumHoursOfServiceCompletedInYearOfContribution    
Matching contribution $ 193,000us-gaap_DefinedContributionPlanCostRecognized $ 198,000us-gaap_DefinedContributionPlanCostRecognized  
Employer matching contribution, percent 5.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent    
Cash contributions to ESOP 150,000us-gaap_EmployeeStockOwnershipPlanESOPCashContributionsToESOP 125,000us-gaap_EmployeeStockOwnershipPlanESOPCashContributionsToESOP  
Employee Stock Ownership Plan (ESOP), Debt Structure, Indirect Loan, Amount 0us-gaap_EmployeeStockOwnershipPlanESOPDebtStructureIndirectLoanAmount    
Non-Qualified Deferred Compensation Plans [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Deferred compensation arrangement $ 137,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
/ us-gaap_PlanNameAxis
= nsec_NonQualifiedDeferredCompensationPlansMember
$ 259,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
/ us-gaap_PlanNameAxis
= nsec_NonQualifiedDeferredCompensationPlansMember
 
Executive Officers [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Employer matching contribution, percent     15.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
/ us-gaap_TitleOfIndividualAxis
= nsec_ExecutiveOffisersMember