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Segments (Schedule of Gross and Net Premiums Written) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Segment Reporting Information [Line Items]    
Gross premiums written $ 16,540us-gaap_DirectPremiumsWritten $ 16,170us-gaap_DirectPremiumsWritten
Reinsurance premium ceded (1,506)us-gaap_CededPremiumsWritten (1,778)us-gaap_CededPremiumsWritten
Net premiums written 15,034us-gaap_PremiumsWrittenNet 14,392us-gaap_PremiumsWrittenNet
Life Insurance Operations [Member]    
Segment Reporting Information [Line Items]    
Gross premiums written 1,556us-gaap_DirectPremiumsWritten
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember
1,623us-gaap_DirectPremiumsWritten
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember
Reinsurance premium ceded (15)us-gaap_CededPremiumsWritten
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember
(23)us-gaap_CededPremiumsWritten
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember
Net premiums written 1,541us-gaap_PremiumsWrittenNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember
1,600us-gaap_PremiumsWrittenNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember
Life Insurance Operations [Member] | Traditional Life Insurance [Member]    
Segment Reporting Information [Line Items]    
Gross premiums written 1,137us-gaap_DirectPremiumsWritten
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember
/ us-gaap_SubsegmentsAxis
= nsec_TraditionalLifeInsuranceMember
1,179us-gaap_DirectPremiumsWritten
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember
/ us-gaap_SubsegmentsAxis
= nsec_TraditionalLifeInsuranceMember
Life Insurance Operations [Member] | Accident and Health Insurance [Member]    
Segment Reporting Information [Line Items]    
Gross premiums written 419us-gaap_DirectPremiumsWritten
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember
/ us-gaap_SubsegmentsAxis
= nsec_AccidentandHealthInsuranceMember
444us-gaap_DirectPremiumsWritten
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember
/ us-gaap_SubsegmentsAxis
= nsec_AccidentandHealthInsuranceMember
P&C Insurance Operations [Member]    
Segment Reporting Information [Line Items]    
Gross premiums written 14,984us-gaap_DirectPremiumsWritten
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
14,547us-gaap_DirectPremiumsWritten
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Reinsurance premium ceded (1,491)us-gaap_CededPremiumsWritten
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
(1,755)us-gaap_CededPremiumsWritten
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Net premiums written 13,493us-gaap_PremiumsWrittenNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
12,792us-gaap_PremiumsWrittenNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
P&C Insurance Operations [Member] | Dwelling Fire & Extended Coverage [Member]    
Segment Reporting Information [Line Items]    
Gross premiums written 8,728us-gaap_DirectPremiumsWritten
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
/ us-gaap_SubsegmentsAxis
= nsec_DwellingFireandExtendedCoverageMember
8,329us-gaap_DirectPremiumsWritten
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
/ us-gaap_SubsegmentsAxis
= nsec_DwellingFireandExtendedCoverageMember
P&C Insurance Operations [Member] | Homeowners (Including Mobile Homeowners) [Member]    
Segment Reporting Information [Line Items]    
Gross premiums written 5,751us-gaap_DirectPremiumsWritten
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
/ us-gaap_SubsegmentsAxis
= nsec_HomeownersIncludingMobileHomeownersMember
5,749us-gaap_DirectPremiumsWritten
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
/ us-gaap_SubsegmentsAxis
= nsec_HomeownersIncludingMobileHomeownersMember
P&C Insurance Operations [Member] | Other Liability [Member]    
Segment Reporting Information [Line Items]    
Gross premiums written $ 505us-gaap_DirectPremiumsWritten
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
/ us-gaap_SubsegmentsAxis
= nsec_InsuranceProductLineOtherliabilityMember
$ 469us-gaap_DirectPremiumsWritten
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
/ us-gaap_SubsegmentsAxis
= nsec_InsuranceProductLineOtherliabilityMember