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Segments (Schedule of Gross and Net Premiums Earned) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]    
Gross premiums earned $ 63,902us-gaap_DirectPremiumsEarned $ 60,906us-gaap_DirectPremiumsEarned
Reinsurance premium ceded (7,249)us-gaap_CededPremiumsEarned (8,540)us-gaap_CededPremiumsEarned
Net premiums earned 56,653us-gaap_PremiumsEarnedNet 52,366us-gaap_PremiumsEarnedNet
Life Insurance Operations [Member]    
Segment Reporting Information [Line Items]    
Gross premiums earned 6,446us-gaap_DirectPremiumsEarned
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember		 6,657us-gaap_DirectPremiumsEarned
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember
Reinsurance premium ceded (72)us-gaap_CededPremiumsEarned
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember		 (66)us-gaap_CededPremiumsEarned
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember
Net premiums earned 6,374us-gaap_PremiumsEarnedNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember		 6,591us-gaap_PremiumsEarnedNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember
Life Insurance Operations [Member] | Traditional Life Insurance [Member]    
Segment Reporting Information [Line Items]    
Gross premiums earned 4,555us-gaap_DirectPremiumsEarned
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember
/ us-gaap_SubsegmentsAxis
= nsec_TraditionalLifeInsuranceMember		 4,718us-gaap_DirectPremiumsEarned
/ 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 earned 1,891us-gaap_DirectPremiumsEarned
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember
/ us-gaap_SubsegmentsAxis
= nsec_AccidentandHealthInsuranceMember		 1,939us-gaap_DirectPremiumsEarned
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember
/ us-gaap_SubsegmentsAxis
= nsec_AccidentandHealthInsuranceMember
P&C Insurance Operations [Member]    
Segment Reporting Information [Line Items]    
Gross premiums earned 57,456us-gaap_DirectPremiumsEarned
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember		 54,249us-gaap_DirectPremiumsEarned
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Reinsurance premium ceded (7,177)us-gaap_CededPremiumsEarned
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember		 (8,474)us-gaap_CededPremiumsEarned
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Net premiums earned 50,279us-gaap_PremiumsEarnedNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember		 45,775us-gaap_PremiumsEarnedNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
P&C Insurance Operations [Member] | Dwelling Fire & Extended Coverage [Member]    
Segment Reporting Information [Line Items]    
Gross premiums earned 31,993us-gaap_DirectPremiumsEarned
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
/ us-gaap_SubsegmentsAxis
= nsec_DwellingFireandExtendedCoverageMember		 29,302us-gaap_DirectPremiumsEarned
/ 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 earned 23,669us-gaap_DirectPremiumsEarned
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
/ us-gaap_SubsegmentsAxis
= nsec_HomeownersIncludingMobileHomeownersMember		 22,830us-gaap_DirectPremiumsEarned
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
/ us-gaap_SubsegmentsAxis
= nsec_HomeownersIncludingMobileHomeownersMember
P&C Insurance Operations [Member] | Ocean Marine [Member]    
Segment Reporting Information [Line Items]    
Gross premiums earned 0us-gaap_DirectPremiumsEarned
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
/ us-gaap_SubsegmentsAxis
= nsec_OceanMarineMember		 524us-gaap_DirectPremiumsEarned
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
/ us-gaap_SubsegmentsAxis
= nsec_OceanMarineMember
P&C Insurance Operations [Member] | Other Liability [Member]    
Segment Reporting Information [Line Items]    
Gross premiums earned $ 1,794us-gaap_DirectPremiumsEarned
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
/ us-gaap_SubsegmentsAxis
= nsec_InsuranceProductLineOtherliabilityMember		 $ 1,593us-gaap_DirectPremiumsEarned
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
/ us-gaap_SubsegmentsAxis
= nsec_InsuranceProductLineOtherliabilityMember