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Related Party Transactions (Details) (USD $)
12 Months Ended 1 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Apr. 30, 2014
Nov. 01, 2011
Robert L. Moody, Jr. [Member]        
Related Party Transaction [Line Items]        
Commission paid under agency contracts $ 426,445us-gaap_NoninterestExpenseCommissionExpense
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nwli_RobertLMoodyJrMember
     
Marketing consulting fees   48,000us-gaap_ProfessionalAndContractServicesExpense
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nwli_RobertLMoodyJrMember
   
Commission and service fees expense 89,253nwli_CommissionAndServiceFeesExpense
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nwli_RobertLMoodyJrMember
     
Company paid guest travel 50,681us-gaap_TravelAndEntertainmentExpense
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nwli_RobertLMoodyJrMember
     
MNB [Member]        
Related Party Transaction [Line Items]        
Commission and service fees expense 663,132nwli_CommissionAndServiceFeesExpense
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nwli_MoodyNationalBankMember
     
RMS [Member]        
Related Party Transaction [Line Items]        
Management fees 819,085us-gaap_PaymentForManagementFee
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nwli_RegentManagementServicesLimitedPartnershipMember
     
American National Insurance Company [Member]        
Related Party Transaction [Line Items]        
Professional fees 42,164us-gaap_ProfessionalFees
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nwli_AmericanNationalInsuranceCompanyMember
  12,197us-gaap_ProfessionalFees
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nwli_AmericanNationalInsuranceCompanyMember
 
Premiums paid during the year 265,602nwli_RelatedPartyTransactionsPremiumsPaidDuringYear
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nwli_AmericanNationalInsuranceCompanyMember
     
Reimbursements for claim costs 1,800,770nwli_ReimbursemntClaimCosts
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nwli_AmericanNationalInsuranceCompanyMember
     
Premium received 1,875,873nwli_RelatedPrtyTransactionPremiumReceived
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nwli_AmericanNationalInsuranceCompanyMember
     
Term of agreement     2 years  
The Company [Member] | Moody Bancshares, Inc. [Member]        
Related Party Transaction [Line Items]        
Percentage of ownership 6.80%nwli_RelatedPartyTransactionOwnershipPercentage
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nwli_MoodyBancsharesIncMember
     
RCC [Member] | RMS [Member]        
Related Party Transaction [Line Items]        
Percentage of ownership 1.00%nwli_RelatedPartyTransactionOwnershipPercentage
/ dei_LegalEntityAxis
= nwli_RccManagementServicesIncMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nwli_RegentManagementServicesLimitedPartnershipMember
     
Three R Trusts [Member] | RCC [Member]        
Related Party Transaction [Line Items]        
Percentage of ownership 100.00%nwli_RelatedPartyTransactionOwnershipPercentage
/ dei_LegalEntityAxis
= nwli_ThreeRTrustsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nwli_RccManagementServicesIncMember
     
Three R Trusts [Member] | RMS [Member]        
Related Party Transaction [Line Items]        
Percentage of ownership 99.00%nwli_RelatedPartyTransactionOwnershipPercentage
/ dei_LegalEntityAxis
= nwli_ThreeRTrustsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nwli_RegentManagementServicesLimitedPartnershipMember
     
Moody Bancshares, Inc. [Member] | Moody Bank Holding [Member]        
Related Party Transaction [Line Items]        
Percentage of ownership 100.00%nwli_RelatedPartyTransactionOwnershipPercentage
/ dei_LegalEntityAxis
= nwli_MoodyBancsharesIncMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nwli_MoodyBankHoldingMember
     
Moody Bank Holding [Member] | MNB [Member]        
Related Party Transaction [Line Items]        
Percentage of ownership 98.00%nwli_RelatedPartyTransactionOwnershipPercentage
/ dei_LegalEntityAxis
= nwli_MoodyBankHoldingMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nwli_MoodyNationalBankMember
     
MNB [Member]        
Related Party Transaction [Line Items]        
Term of lease       36 months
Rent per month       $ 6,363nwli_LessorLeasingArrangementsOperatingLeasesRentPerMonth
/ dei_LegalEntityAxis
= nwli_MoodyNationalBankMember