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Segments (Schedule of Gross and Net Premiums Earned) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Segment Reporting Information [Line Items]    
Gross premiums earned $ 16,212us-gaap_DirectPremiumsEarned $ 15,602us-gaap_DirectPremiumsEarned
Reinsurance premium ceded (1,506)us-gaap_CededPremiumsEarned (1,778)us-gaap_CededPremiumsEarned
Net premiums earned 14,706us-gaap_PremiumsEarnedNet 13,824us-gaap_PremiumsEarnedNet
Life Insurance Operations [Member]    
Segment Reporting Information [Line Items]    
Gross premiums earned 1,599us-gaap_DirectPremiumsEarned
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember
1,674us-gaap_DirectPremiumsEarned
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember
Reinsurance premium ceded (15)us-gaap_CededPremiumsEarned
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember
(23)us-gaap_CededPremiumsEarned
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember
Net premiums earned 1,584us-gaap_PremiumsEarnedNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember
1,651us-gaap_PremiumsEarnedNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember
Life Insurance Operations [Member] | Traditional Life Insurance [Member]    
Segment Reporting Information [Line Items]    
Gross premiums earned 1,178us-gaap_DirectPremiumsEarned
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember
/ us-gaap_SubsegmentsAxis
= nsec_TraditionalLifeInsuranceMember
1,243us-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 421us-gaap_DirectPremiumsEarned
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember
/ us-gaap_SubsegmentsAxis
= nsec_AccidentandHealthInsuranceMember
431us-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 14,613us-gaap_DirectPremiumsEarned
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
13,928us-gaap_DirectPremiumsEarned
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Reinsurance premium ceded (1,491)us-gaap_CededPremiumsEarned
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
(1,755)us-gaap_CededPremiumsEarned
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Net premiums earned 13,122us-gaap_PremiumsEarnedNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
12,173us-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 8,200us-gaap_DirectPremiumsEarned
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
/ us-gaap_SubsegmentsAxis
= nsec_DwellingFireandExtendedCoverageMember
7,670us-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 5,948us-gaap_DirectPremiumsEarned
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
/ us-gaap_SubsegmentsAxis
= nsec_HomeownersIncludingMobileHomeownersMember
5,831us-gaap_DirectPremiumsEarned
/ 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 earned $ 465us-gaap_DirectPremiumsEarned
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
/ us-gaap_SubsegmentsAxis
= nsec_InsuranceProductLineOtherliabilityMember
$ 427us-gaap_DirectPremiumsEarned
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
/ us-gaap_SubsegmentsAxis
= nsec_InsuranceProductLineOtherliabilityMember