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Commitments and Contingencies (Details) (USD $)
12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Feb. 03, 2010
Oct. 26, 2011
Loss Contingencies [Line Items]          
Commitments to extend credit relating to mortgage loans $ 7,000,000us-gaap_OtherCommitment        
Guaranty association assessment expense     1,900,000us-gaap_LossContingencyUndiscountedAmountOfInsuranceRelatedAssessmentLiability    
Rental expense 100,000us-gaap_LeaseAndRentalExpense 400,000us-gaap_LeaseAndRentalExpense 200,000us-gaap_LeaseAndRentalExpense    
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]          
2015 214,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent        
2016 and thereafter 880,000nwli_OperatingLeasesFutureMinimumPaymentsDueInTwoYearsAndThereafter        
Total 1,094,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue        
Expected contribution in 2015 1,800,000nwli_NonQualifiedDeferredCompensantionPlanEstimatedFutureEmployerContributionInNextFiscalYear        
Recovery of nonvested amounts in 2015 1,200,000nwli_NonQualifiedDeferredCompensationPlanEstimatedRecoveryofNonvestedAmount        
Guaranty Association Assessments [Member]          
Loss Contingencies [Line Items]          
Guaranty association assessments 300,000us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= nwli_GuarantyAssociationAssessmentsMember
1,000,000us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= nwli_GuarantyAssociationAssessmentsMember
     
Deferred Annuities Litigation [Member]          
Loss Contingencies [Line Items]          
Guaranty association assessments 6,500,000us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_LitigationCaseAxis
= nwli_DeferredAnnuitiesLitigationMember
       
Sheila Newman case [Member]          
Loss Contingencies [Line Items]          
Final Judgment amount       208,000us-gaap_LossContingencyDamagesAwardedValue
/ us-gaap_LitigationCaseAxis
= nwli_SheilaNewmanCaseMember
 
Final Judgment amount, actual damages       113,000nwli_LossContingencyDamagesAwardedActualDamagesValue
/ us-gaap_LitigationCaseAxis
= nwli_SheilaNewmanCaseMember
 
Final Judgment amount, exemplary damages       150,000,000nwli_LossContingencyDamagesAwardedExemplaryDamagesValue
/ us-gaap_LitigationCaseAxis
= nwli_SheilaNewmanCaseMember
 
Brazilian Superintendence of Private Insurance [Member]          
Loss Contingencies [Line Items]          
SUSEP is attempting to impose peal fine         $ 6,000,000,000us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_LitigationCaseAxis
= nwli_BrazilianSuperintendenceOfPrivateInsuranceMember
Option One [Member] | Deferred Annuities Litigation [Member]          
Loss Contingencies [Line Items]          
Life Settlement in Years 10 years        
Option Two [Member] | Deferred Annuities Litigation [Member]          
Loss Contingencies [Line Items]          
Life Settlement in Years 20 years