National Western Life Group, Inc.

$ Overview Financials Valuation SEC Filings Company Website

2024 Q1 Form 10-Q Financial Statement

#000163598424000015 Filed on May 09, 2024

Income Statement

Concept	2024 Q1

Balance Sheet

Concept	2024 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$450.5M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment
YoY Change
Goodwill	$13.86M
YoY Change	0.0%
Intangibles
YoY Change
Long-Term Investments	$9.109B
YoY Change	-5.2%
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$12.12B
YoY Change	-5.21%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$14.68M
YoY Change	132.9%
LONG-TERM LIABILITIES
Long-Term Debt	$0.00
YoY Change
Other Long-Term Liabilities	$1.654B
YoY Change	12.61%
Total Long-Term Liabilities	$1.654B
YoY Change	12.61%
TOTAL LIABILITIES
Total Short-Term Liabilities	$14.68M
Total Long-Term Liabilities	$1.654B
Total Liabilities	$9.619B
YoY Change	-8.17%
SHAREHOLDERS EQUITY
Retained Earnings	$2.794B
YoY Change	5.85%
Common Stock
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$2.497B
YoY Change
Total Liabilities & Shareholders Equity	$12.12B
YoY Change	-5.21%

Cashflow Statement

Concept	2024 Q1

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2024Q1	dei	Entity Central Index Key EntityCentralIndexKey	0001635984
CY2024Q1	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2024Q1	us-gaap	Reinsurance Recoverables Allowance ReinsuranceRecoverablesAllowance	0	usd
CY2023Q4	us-gaap	Reinsurance Recoverables Allowance ReinsuranceRecoverablesAllowance	0	usd
CY2024Q1	us-gaap	Reinsurance Recoverables ReinsuranceRecoverables	1471609000	usd
CY2023Q4	us-gaap	Reinsurance Recoverables ReinsuranceRecoverables	1542424000	usd
CY2024Q1	us-gaap	Other Assets OtherAssets	115648000	usd
CY2023Q4	us-gaap	Other Assets OtherAssets	111086000	usd
CY2024Q1	us-gaap	Assets Assets	12116444000	usd
CY2023Q4	us-gaap	Assets Assets	12250615000	usd
CY2024Q1	nwli	Liability For Policyholder Account Balances Before Reinsurance LiabilityForPolicyholderAccountBalancesBeforeReinsurance	6729842000	usd
CY2023Q4	nwli	Liability For Policyholder Account Balances Before Reinsurance LiabilityForPolicyholderAccountBalancesBeforeReinsurance	6900491000	usd
CY2024Q1	nwli	Additional Liability For Benefits In Excess Of Account Balance AdditionalLiabilityForBenefitsInExcessOfAccountBalance	161319000	usd
CY2023Q4	nwli	Additional Liability For Benefits In Excess Of Account Balance AdditionalLiabilityForBenefitsInExcessOfAccountBalance	159437000	usd
CY2024Q1	us-gaap	Liability For Future Policy Benefits Life LiabilityForFuturePolicyBenefitsLife	899544000	usd
CY2024Q1	us-gaap	Market Risk Benefit Liability Amount MarketRiskBenefitLiabilityAmount	261912000	usd
CY2023Q4	us-gaap	Market Risk Benefit Liability Amount MarketRiskBenefitLiabilityAmount	273404000	usd
CY2024Q1	us-gaap	Other Policyholder Funds OtherPolicyholderFunds	148000000	usd
CY2023Q4	us-gaap	Other Policyholder Funds OtherPolicyholderFunds	143766000	usd
CY2023Q4	us-gaap	Funds Held Under Reinsurance Agreements Liability FundsHeldUnderReinsuranceAgreementsLiability	1195413000	usd
CY2024Q1	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q1
CY2024Q1	dei	Amendment Flag AmendmentFlag	false
CY2024Q1	dei	Document Quarterly Report DocumentQuarterlyReport	true
CY2024Q1	dei	Document Transition Report DocumentTransitionReport	false
CY2024Q1	dei	Entity Registrant Name EntityRegistrantName	NATIONAL WESTERN LIFE GROUP, INC.
CY2024Q1	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2024Q1	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	47-3339380
CY2024Q1	dei	Entity Address Address Line1 EntityAddressAddressLine1	10801 N. Mopac Expy Bldg 3
CY2024Q1	dei	Entity Address City Or Town EntityAddressCityOrTown	Austin,
CY2024Q1	dei	Entity Address State Or Province EntityAddressStateOrProvince	TX
CY2024Q1	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	78759
CY2024Q1	dei	City Area Code CityAreaCode	(512)
CY2024Q1	dei	Local Phone Number LocalPhoneNumber	836-1010
CY2024Q1	dei	Trading Symbol TradingSymbol	NWLI
CY2024Q1	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2024Q1	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2024Q1	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2024Q1	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2024Q1	dei	Entity Small Business EntitySmallBusiness	false
CY2024Q1	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2024Q1	dei	Entity Shell Company EntityShellCompany	false
CY2024Q1	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2024
CY2024Q1	us-gaap	Fair Value Asset Recurring Basis Still Held Unrealized Gain Loss Statement Of Income Extensible List FairValueAssetRecurringBasisStillHeldUnrealizedGainLossStatementOfIncomeExtensibleList	http://fasb.org/us-gaap/2023#NetInvestmentIncome http://www.nationalwesternlife.com/20240331#BenefitsLossesAndExpensesIncomeNet
CY2024Q1	us-gaap	Fair Value Recurring Basis Unobservable Input Reconciliation Asset Gain Loss Statement Of Other Comprehensive Income Extensible List FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfOtherComprehensiveIncomeExtensibleList	http://fasb.org/us-gaap/2023#OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
CY2024Q1	us-gaap	Fair Value Recurring Basis Unobservable Input Reconciliation Asset Gain Loss Statement Of Income Extensible List FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfIncomeExtensibleList	http://fasb.org/us-gaap/2023#NetIncomeLoss
CY2024Q1	us-gaap	Fair Value Recurring Basis Unobservable Input Reconciliation Liability Gain Loss Statement Of Income Extensible List FairValueRecurringBasisUnobservableInputReconciliationLiabilityGainLossStatementOfIncomeExtensibleList	http://fasb.org/us-gaap/2023#NetIncomeLoss
CY2024Q1	us-gaap	Fair Value Liability Recurring Basis Still Held Unrealized Gain Loss Statement Of Income Extensible List FairValueLiabilityRecurringBasisStillHeldUnrealizedGainLossStatementOfIncomeExtensibleList	http://fasb.org/us-gaap/2023#NetInvestmentIncome http://www.nationalwesternlife.com/20240331#BenefitsLossesAndExpensesIncomeNet
CY2023Q1	us-gaap	Fair Value Asset Recurring Basis Still Held Unrealized Gain Loss Statement Of Income Extensible List FairValueAssetRecurringBasisStillHeldUnrealizedGainLossStatementOfIncomeExtensibleList	http://fasb.org/us-gaap/2023#NetInvestmentIncome http://www.nationalwesternlife.com/20240331#BenefitsLossesAndExpensesIncomeNet
CY2023Q1	us-gaap	Fair Value Recurring Basis Unobservable Input Reconciliation Asset Gain Loss Statement Of Other Comprehensive Income Extensible List FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfOtherComprehensiveIncomeExtensibleList	http://fasb.org/us-gaap/2023#OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
CY2023Q1	us-gaap	Fair Value Recurring Basis Unobservable Input Reconciliation Asset Gain Loss Statement Of Income Extensible List FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfIncomeExtensibleList	http://fasb.org/us-gaap/2023#NetIncomeLoss
CY2023Q1	us-gaap	Fair Value Recurring Basis Unobservable Input Reconciliation Liability Gain Loss Statement Of Income Extensible List FairValueRecurringBasisUnobservableInputReconciliationLiabilityGainLossStatementOfIncomeExtensibleList	http://fasb.org/us-gaap/2023#NetIncomeLoss
CY2023Q1	us-gaap	Fair Value Liability Recurring Basis Still Held Unrealized Gain Loss Statement Of Income Extensible List FairValueLiabilityRecurringBasisStillHeldUnrealizedGainLossStatementOfIncomeExtensibleList	http://fasb.org/us-gaap/2023#NetInvestmentIncome http://www.nationalwesternlife.com/20240331#BenefitsLossesAndExpensesIncomeNet
CY2024Q1	dei	Document Period End Date DocumentPeriodEndDate	2024-03-31
CY2024Q1	dei	Security12b Title Security12bTitle	Class A Common Stock, $0.01 par value
CY2024Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	usd
CY2024Q1	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	7712847000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	7714503000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	7071553000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	7108188000	usd
CY2024Q1	us-gaap	Trading Securities Debt Amortized Cost TradingSecuritiesDebtAmortizedCost	1142723000	usd
CY2023Q4	us-gaap	Trading Securities Debt Amortized Cost TradingSecuritiesDebtAmortizedCost	1204968000	usd
CY2024Q1	us-gaap	Trading Securities Debt TradingSecuritiesDebt	985435000	usd
CY2023Q4	us-gaap	Trading Securities Debt TradingSecuritiesDebt	1046856000	usd
CY2024Q1	us-gaap	Allowance For Loan And Lease Losses Real Estate AllowanceForLoanAndLeaseLossesRealEstate	3665000	usd
CY2023Q4	us-gaap	Allowance For Loan And Lease Losses Real Estate AllowanceForLoanAndLeaseLossesRealEstate	3651000	usd
CY2024Q1	nwli	Mortgage Loans On Real Estate Commercial And Consumer Net Fair Value Disclosure MortgageLoansOnRealEstateCommercialAndConsumerNetFairValueDisclosure	19388000	usd
CY2023Q4	nwli	Mortgage Loans On Real Estate Commercial And Consumer Net Fair Value Disclosure MortgageLoansOnRealEstateCommercialAndConsumerNetFairValueDisclosure	19580000	usd
CY2024Q1	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	470793000	usd
CY2023Q4	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	474133000	usd
CY2024Q1	us-gaap	Derivative Assets DerivativeAssets	114669000	usd
CY2023Q4	us-gaap	Derivative Assets DerivativeAssets	85158000	usd
CY2024Q1	us-gaap	Equity Securities Fv Ni Cost EquitySecuritiesFvNiCost	14229000	usd
CY2023Q4	us-gaap	Equity Securities Fv Ni Cost EquitySecuritiesFvNiCost	14268000	usd
CY2024Q1	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	26399000	usd
CY2023Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	24098000	usd
CY2024Q1	us-gaap	Other Long Term Investments OtherLongTermInvestments	311418000	usd
CY2023Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	295471000	usd
CY2024Q1	us-gaap	Other Short Term Investments OtherShortTermInvestments	24093000	usd
CY2023Q4	us-gaap	Other Short Term Investments OtherShortTermInvestments	0	usd
CY2024Q1	us-gaap	Investments Investments	9069198000	usd
CY2023Q4	us-gaap	Investments Investments	9100506000	usd
CY2024Q1	us-gaap	Cash Cash Equivalents And Short Term Investments CashCashEquivalentsAndShortTermInvestments	450499000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents And Short Term Investments CashCashEquivalentsAndShortTermInvestments	482758000	usd
CY2024Q1	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	619967000	usd
CY2023Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	628673000	usd
CY2024Q1	us-gaap	Deferred Sales Inducements Net DeferredSalesInducementsNet	67183000	usd
CY2023Q4	us-gaap	Deferred Sales Inducements Net DeferredSalesInducementsNet	70950000	usd
CY2024Q1	us-gaap	Value Of Business Acquired Voba ValueOfBusinessAcquiredVOBA	127827000	usd
CY2023Q4	us-gaap	Value Of Business Acquired Voba ValueOfBusinessAcquiredVOBA	129905000	usd
CY2024Q1	nwli	Capitalized Costs Reinsurance CapitalizedCostsReinsurance	65042000	usd
CY2023Q4	nwli	Capitalized Costs Reinsurance CapitalizedCostsReinsurance	67937000	usd
CY2024Q1	us-gaap	Market Risk Benefit Asset Amount MarketRiskBenefitAssetAmount	39474000	usd
CY2023Q4	us-gaap	Market Risk Benefit Asset Amount MarketRiskBenefitAssetAmount	30819000	usd
CY2024Q1	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	89997000	usd
CY2023Q4	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	82484000	usd
CY2024Q1	us-gaap	Income Tax Receivable IncomeTaxReceivable	0	usd
CY2023Q4	us-gaap	Income Tax Receivable IncomeTaxReceivable	3073000	usd
CY2023Q4	us-gaap	Liability For Future Policy Benefits Life LiabilityForFuturePolicyBenefitsLife	925787000	usd
CY2024Q1	us-gaap	Funds Held Under Reinsurance Agreements Liability FundsHeldUnderReinsuranceAgreementsLiability	1161625000	usd
CY2024Q1	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	11906000	usd
CY2023Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	14335000	usd
CY2024Q1	us-gaap	Accrued Income Taxes AccruedIncomeTaxes	14675000	usd
CY2023Q4	us-gaap	Accrued Income Taxes AccruedIncomeTaxes	0	usd
CY2024Q1	us-gaap	Other Liabilities OtherLiabilities	230646000	usd
CY2023Q4	us-gaap	Other Liabilities OtherLiabilities	198258000	usd
CY2024Q1	us-gaap	Liabilities Liabilities	9619469000	usd
CY2023Q4	us-gaap	Liabilities Liabilities	9810891000	usd
CY2024Q1	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2023Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2024Q1	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	41716000	usd
CY2023Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	41716000	usd
CY2024Q1	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-338930000	usd
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-322573000	usd
CY2024Q1	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	2794153000	usd
CY2023Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	2720545000	usd
CY2024Q1	us-gaap	Stockholders Equity StockholdersEquity	2496975000	usd
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	2439724000	usd
CY2024Q1	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	12116444000	usd
CY2023Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	12250615000	usd
CY2024Q1	us-gaap	Insurance Commissions And Fees InsuranceCommissionsAndFees	34370000	usd
CY2023Q1	us-gaap	Insurance Commissions And Fees InsuranceCommissionsAndFees	35357000	usd
CY2024Q1	nwli	Traditional Life And Single Premium TraditionalLifeAndSinglePremium	22858000	usd
CY2023Q1	nwli	Traditional Life And Single Premium TraditionalLifeAndSinglePremium	21576000	usd
CY2024Q1	us-gaap	Net Investment Income NetInvestmentIncome	134361000	usd
CY2023Q1	us-gaap	Net Investment Income NetInvestmentIncome	89909000	usd
CY2024Q1	us-gaap	Other Income OtherIncome	5985000	usd
CY2023Q1	us-gaap	Other Income OtherIncome	5705000	usd
CY2024Q1	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-8000	usd
CY2023Q1	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	67000	usd
CY2024Q1	us-gaap	Revenues Revenues	197566000	usd
CY2023Q1	us-gaap	Revenues Revenues	152614000	usd
CY2024Q1	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	25519000	usd
CY2023Q1	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	24190000	usd
CY2024Q1	us-gaap	Market Risk Benefit Period Increase Decrease MarketRiskBenefitPeriodIncreaseDecrease	-16417000	usd
CY2023Q1	us-gaap	Market Risk Benefit Period Increase Decrease MarketRiskBenefitPeriodIncreaseDecrease	36960000	usd
CY2024Q1	nwli	Deferred Transaction Costs Amortization Expense Benefit DeferredTransactionCostsAmortizationExpenseBenefit	20439000	usd
CY2023Q1	nwli	Deferred Transaction Costs Amortization Expense Benefit DeferredTransactionCostsAmortizationExpenseBenefit	21274000	usd
CY2024Q1	nwli	Life And Annuity Contract Interest Income Expense LifeAndAnnuityContractInterestIncomeExpense	41611000	usd
CY2023Q1	nwli	Life And Annuity Contract Interest Income Expense LifeAndAnnuityContractInterestIncomeExpense	30212000	usd
CY2024Q1	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	33136000	usd
CY2023Q1	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	24683000	usd
CY2024Q1	nwli	Benefits Losses And Expenses Income Net BenefitsLossesAndExpensesIncomeNet	104288000	usd
CY2023Q1	nwli	Benefits Losses And Expenses Income Net BenefitsLossesAndExpensesIncomeNet	137319000	usd
CY2024Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	93278000	usd
CY2023Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	15295000	usd
CY2024Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	19670000	usd
CY2023Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2991000	usd
CY2024Q1	us-gaap	Net Income Loss NetIncomeLoss	73608000	usd
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	12304000	usd
CY2024Q1	us-gaap	Net Income Loss NetIncomeLoss	73608000	usd
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	12304000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-27640000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	125201000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	-6000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	53000	usd
CY2024Q1	nwli	Other Comprehensive Income Loss Securities Adjustments And Other Than Temporary Impairment Losses Portion Attributable To Parent OtherComprehensiveIncomeLossSecuritiesAdjustmentsAndOtherThanTemporaryImpairmentLossesPortionAttributableToParent	-27634000	usd
CY2023Q1	nwli	Other Comprehensive Income Loss Securities Adjustments And Other Than Temporary Impairment Losses Portion Attributable To Parent OtherComprehensiveIncomeLossSecuritiesAdjustmentsAndOtherThanTemporaryImpairmentLossesPortionAttributableToParent	125148000	usd
CY2024Q1	us-gaap	Oci Liability For Future Policy Benefit Gain Loss After Reclassification Adjustment And Tax Parent OciLiabilityForFuturePolicyBenefitGainLossAfterReclassificationAdjustmentAndTaxParent	17474000	usd
CY2023Q1	us-gaap	Oci Liability For Future Policy Benefit Gain Loss After Reclassification Adjustment And Tax Parent OciLiabilityForFuturePolicyBenefitGainLossAfterReclassificationAdjustmentAndTaxParent	-21714000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-3203000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-30000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	-2994000	usd
CY2024Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	104133000	usd
CY2023Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	47051000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	-399000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-16357000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	103005000	usd
CY2024Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	57251000	usd
CY2023Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	115309000	usd
CY2024Q1	us-gaap	Stockholders Equity StockholdersEquity	2496975000	usd
CY2023Q1	us-gaap	Stockholders Equity StockholdersEquity	2306231000	usd
CY2024Q1	us-gaap	Net Income Loss NetIncomeLoss	73608000	usd
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	12304000	usd
CY2024Q1	nwli	Life And Annuity Contract Interest Income Expense LifeAndAnnuityContractInterestIncomeExpense	41611000	usd
CY2023Q1	nwli	Life And Annuity Contract Interest Income Expense LifeAndAnnuityContractInterestIncomeExpense	30212000	usd
CY2024Q1	us-gaap	Other Noncash Income OtherNoncashIncome	6157000	usd
CY2023Q1	us-gaap	Other Noncash Income OtherNoncashIncome	4782000	usd
CY2024Q1	us-gaap	Gain Loss On Investments GainLossOnInvestments	-8000	usd
CY2023Q1	us-gaap	Gain Loss On Investments GainLossOnInvestments	67000	usd
CY2024Q1	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	700000	usd
CY2023Q1	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	893000	usd
CY2024Q1	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	2415000	usd
CY2023Q1	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	2545000	usd
CY2024Q1	nwli	Increase Decrease In Debt Securities Available For Sale And Held To Maturity And Financing Receivables Allowance For Credit Loss IncreaseDecreaseInDebtSecuritiesAvailableForSaleAndHeldToMaturityAndFinancingReceivablesAllowanceForCreditLoss	14000	usd
CY2023Q1	nwli	Increase Decrease In Debt Securities Available For Sale And Held To Maturity And Financing Receivables Allowance For Credit Loss IncreaseDecreaseInDebtSecuritiesAvailableForSaleAndHeldToMaturityAndFinancingReceivablesAllowanceForCreditLoss	128000	usd
CY2024Q1	us-gaap	Increase Decrease In Debt Securities Trading IncreaseDecreaseInDebtSecuritiesTrading	824000	usd
CY2023Q1	us-gaap	Increase Decrease In Debt Securities Trading IncreaseDecreaseInDebtSecuritiesTrading	24335000	usd
CY2024Q1	us-gaap	Increase Decrease In Equity Securities Fv Ni IncreaseDecreaseInEquitySecuritiesFvNi	2351000	usd
CY2023Q1	us-gaap	Increase Decrease In Equity Securities Fv Ni IncreaseDecreaseInEquitySecuritiesFvNi	1095000	usd
CY2024Q1	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	38474000	usd
CY2023Q1	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	2933000	usd
CY2024Q1	nwli	Increase Decrease In Alternative Investments IncreaseDecreaseInAlternativeInvestments	-6450000	usd
CY2023Q1	nwli	Increase Decrease In Alternative Investments IncreaseDecreaseInAlternativeInvestments	0	usd
CY2024Q1	nwli	Increase Decrease In Deferred Policy Acquisition Costs Sales Inducement Costs And Value Of Business Acquired IncreaseDecreaseInDeferredPolicyAcquisitionCostsSalesInducementCostsAndValueOfBusinessAcquired	-14551000	usd
CY2023Q1	nwli	Increase Decrease In Deferred Policy Acquisition Costs Sales Inducement Costs And Value Of Business Acquired IncreaseDecreaseInDeferredPolicyAcquisitionCostsSalesInducementCostsAndValueOfBusinessAcquired	-14755000	usd
CY2024Q1	us-gaap	Increase Decrease In Accrued Investment Income Receivable IncreaseDecreaseInAccruedInvestmentIncomeReceivable	7513000	usd
CY2023Q1	us-gaap	Increase Decrease In Accrued Investment Income Receivable IncreaseDecreaseInAccruedInvestmentIncomeReceivable	6526000	usd
CY2024Q1	us-gaap	Increase Decrease In Reinsurance Recoverable IncreaseDecreaseInReinsuranceRecoverable	-70815000	usd
CY2023Q1	us-gaap	Increase Decrease In Reinsurance Recoverable IncreaseDecreaseInReinsuranceRecoverable	-16069000	usd
CY2024Q1	nwli	Increase Decrease In Cost Of Reinsurance IncreaseDecreaseInCostOfReinsurance	2895000	usd
CY2023Q1	nwli	Increase Decrease In Cost Of Reinsurance IncreaseDecreaseInCostOfReinsurance	3025000	usd
CY2024Q1	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	3911000	usd
CY2023Q1	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	5199000	usd
CY2024Q1	us-gaap	Increase Decrease In Future Policy Benefit Reserves IncreaseDecreaseInFuturePolicyBenefitReserves	2835000	usd
CY2023Q1	us-gaap	Increase Decrease In Future Policy Benefit Reserves IncreaseDecreaseInFuturePolicyBenefitReserves	16527000	usd
CY2024Q1	us-gaap	Market Risk Benefit Change In Fair Value Gain Loss MarketRiskBenefitChangeInFairValueGainLoss	20147000	usd
CY2023Q1	us-gaap	Market Risk Benefit Change In Fair Value Gain Loss MarketRiskBenefitChangeInFairValueGainLoss	-44339000	usd
CY2024Q1	us-gaap	Increase Decrease In Other Policyholder Funds IncreaseDecreaseInOtherPolicyholderFunds	4234000	usd
CY2023Q1	us-gaap	Increase Decrease In Other Policyholder Funds IncreaseDecreaseInOtherPolicyholderFunds	-20864000	usd
CY2024Q1	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	17748000	usd
CY2023Q1	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	12809000	usd
CY2024Q1	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-1919000	usd
CY2023Q1	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	9810000	usd
CY2024Q1	us-gaap	Increase Decrease In Funds Held Under Reinsurance Agreements IncreaseDecreaseInFundsHeldUnderReinsuranceAgreements	33788000	usd
CY2023Q1	us-gaap	Increase Decrease In Funds Held Under Reinsurance Agreements IncreaseDecreaseInFundsHeldUnderReinsuranceAgreements	20731000	usd
CY2024Q1	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-8205000	usd
CY2023Q1	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-8427000	usd
CY2024Q1	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0	usd
CY2023Q1	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	2038000	usd
CY2024Q1	us-gaap	Proceeds From Sale Of Trading Securities Heldforinvestment ProceedsFromSaleOfTradingSecuritiesHeldforinvestment	31972000	usd
CY2023Q1	us-gaap	Proceeds From Sale Of Trading Securities Heldforinvestment ProceedsFromSaleOfTradingSecuritiesHeldforinvestment	7445000	usd
CY2024Q1	us-gaap	Proceeds From Sale Of Other Investments ProceedsFromSaleOfOtherInvestments	50000	usd
CY2023Q1	us-gaap	Proceeds From Sale Of Other Investments ProceedsFromSaleOfOtherInvestments	1134000	usd
CY2024Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	180445000	usd
CY2023Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	265496000	usd
CY2024Q1	us-gaap	Proceeds From Maturities Repayments And Calls Of Trading Securities Heldforinvestment ProceedsFromMaturitiesRepaymentsAndCallsOfTradingSecuritiesHeldforinvestment	52697000	usd
CY2023Q1	us-gaap	Proceeds From Maturities Repayments And Calls Of Trading Securities Heldforinvestment ProceedsFromMaturitiesRepaymentsAndCallsOfTradingSecuritiesHeldforinvestment	15239000	usd
CY2024Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Other Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfOtherInvestments	6365000	usd
CY2023Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Other Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfOtherInvestments	4735000	usd
CY2024Q1	us-gaap	Proceeds From Derivative Instrument Investing Activities ProceedsFromDerivativeInstrumentInvestingActivities	22060000	usd
CY2023Q1	us-gaap	Proceeds From Derivative Instrument Investing Activities ProceedsFromDerivativeInstrumentInvestingActivities	0	usd
CY2024Q1	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	149088000	usd
CY2023Q1	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	73767000	usd
CY2024Q1	us-gaap	Payments To Acquire Trading Securities Heldforinvestment PaymentsToAcquireTradingSecuritiesHeldforinvestment	17476000	usd
CY2023Q1	us-gaap	Payments To Acquire Trading Securities Heldforinvestment PaymentsToAcquireTradingSecuritiesHeldforinvestment	41988000	usd
CY2024Q1	us-gaap	Payments To Acquire Equity Securities Fv Ni PaymentsToAcquireEquitySecuritiesFvNi	0	usd
CY2023Q1	us-gaap	Payments To Acquire Equity Securities Fv Ni PaymentsToAcquireEquitySecuritiesFvNi	11000	usd
CY2024Q1	us-gaap	Payments For Derivative Instrument Investing Activities PaymentsForDerivativeInstrumentInvestingActivities	13282000	usd
CY2023Q1	us-gaap	Payments For Derivative Instrument Investing Activities PaymentsForDerivativeInstrumentInvestingActivities	12945000	usd
CY2024Q1	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	15980000	usd
CY2023Q1	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	13533000	usd
CY2024Q1	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	323000	usd
CY2023Q1	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	1035000	usd
CY2024Q1	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	24093000	usd
CY2023Q1	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	0	usd
CY2024Q1	us-gaap	Proceeds From Sale And Collection Of Mortgage Notes Receivable ProceedsFromSaleAndCollectionOfMortgageNotesReceivable	3269000	usd
CY2023Q1	us-gaap	Proceeds From Sale And Collection Of Mortgage Notes Receivable ProceedsFromSaleAndCollectionOfMortgageNotesReceivable	3417000	usd
CY2024Q1	us-gaap	Payments To Acquire Mortgage Notes Receivable PaymentsToAcquireMortgageNotesReceivable	0	usd
CY2023Q1	us-gaap	Payments To Acquire Mortgage Notes Receivable PaymentsToAcquireMortgageNotesReceivable	1800000	usd
CY2024Q1	us-gaap	Payments For Proceeds From Policy Loans PaymentsForProceedsFromPolicyLoans	-1598000	usd
CY2023Q1	us-gaap	Payments For Proceeds From Policy Loans PaymentsForProceedsFromPolicyLoans	-238000	usd
CY2024Q1	nwli	Payments For Proceeds From Funds Withheld PaymentsForProceedsFromFundsWithheld	-714000	usd
CY2023Q1	nwli	Payments For Proceeds From Funds Withheld PaymentsForProceedsFromFundsWithheld	-576000	usd
CY2024Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	78928000	usd
CY2023Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	155239000	usd
CY2024Q1	us-gaap	Proceeds From Annuities And Investment Certificates ProceedsFromAnnuitiesAndInvestmentCertificates	25181000	usd
CY2023Q1	us-gaap	Proceeds From Annuities And Investment Certificates ProceedsFromAnnuitiesAndInvestmentCertificates	31151000	usd
CY2024Q1	us-gaap	Repayments Of Annuities And Investment Certificates RepaymentsOfAnnuitiesAndInvestmentCertificates	236361000	usd
CY2023Q1	us-gaap	Repayments Of Annuities And Investment Certificates RepaymentsOfAnnuitiesAndInvestmentCertificates	226752000	usd
CY2024Q1	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	86000	usd
CY2023Q1	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	85000	usd
CY2024Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-211266000	usd
CY2023Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-195686000	usd
CY2024Q1	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-4054000	usd
CY2023Q1	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-38000	usd
CY2024Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-32259000	usd
CY2023Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	6566000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	482758000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	295270000	usd
CY2024Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	450499000	usd
CY2023Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	301836000	usd
CY2024Q1	us-gaap	Interest Paid Net InterestPaidNet	19000	usd
CY2023Q1	us-gaap	Interest Paid Net InterestPaidNet	18000	usd
CY2024Q1	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	4000	usd
CY2023Q1	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	5000	usd
CY2024Q1	nwli	Deferral And Amortization Of Sales Inducements Net Noncash Operating Activity DeferralAndAmortizationOfSalesInducementsNetNoncashOperatingActivity	-3767000	usd
CY2023Q1	nwli	Deferral And Amortization Of Sales Inducements Net Noncash Operating Activity DeferralAndAmortizationOfSalesInducementsNetNoncashOperatingActivity	-3299000	usd
CY2024Q1	nwli	Number Of Funds Withheld Coinsurance Agreements NumberOfFundsWithheldCoinsuranceAgreements	2	agreement
CY2024Q1	nwli	Entity Common Stock Number Of Classes Of Stock EntityCommonStockNumberOfClassesOfStock	2	class_of_stock
CY2024Q1	us-gaap	Incremental Common Shares Attributable To Participating Nonvested Shares With Non Forfeitable Dividend Rights IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights	0	shares
CY2024Q1	nwli	Entity Common Stock Number Of Classes Of Stock EntityCommonStockNumberOfClassesOfStock	2	class_of_stock
CY2024Q1	us-gaap	Net Income Loss NetIncomeLoss	73608000	usd
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	12304000	usd
CY2024Q1	us-gaap	Undistributed Earnings UndistributedEarnings	73608000	usd
CY2023Q1	us-gaap	Undistributed Earnings UndistributedEarnings	12304000	usd
CY2024Q1	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	619967000	usd
CY2023Q1	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	654639000	usd
CY2023Q4	us-gaap	Deferred Sales Inducements Net DeferredSalesInducementsNet	70950000	usd
CY2022Q4	us-gaap	Deferred Sales Inducements Net DeferredSalesInducementsNet	85303000	usd
CY2024Q1	nwli	Deferred Sale Inducement Cost Capitalization Disposition Net DeferredSaleInducementCostCapitalizationDispositionNet	-1930000	usd
CY2023Q1	nwli	Deferred Sale Inducement Cost Capitalization Disposition Net DeferredSaleInducementCostCapitalizationDispositionNet	-939000	usd
CY2024Q1	us-gaap	Deferred Sales Inducements Amortization Expense DeferredSalesInducementsAmortizationExpense	1837000	usd
CY2023Q1	us-gaap	Deferred Sales Inducements Amortization Expense DeferredSalesInducementsAmortizationExpense	2360000	usd
CY2024Q1	nwli	Deferred Sales Inducement Cost Ceded DeferredSalesInducementCostCeded	0	usd
CY2023Q1	nwli	Deferred Sales Inducement Cost Ceded DeferredSalesInducementCostCeded	0	usd
CY2024Q1	us-gaap	Deferred Sale Inducement Cost Experience Adjustment DeferredSaleInducementCostExperienceAdjustment	0	usd
CY2023Q1	us-gaap	Deferred Sale Inducement Cost Experience Adjustment DeferredSaleInducementCostExperienceAdjustment	0	usd
CY2024Q1	us-gaap	Deferred Sales Inducements Net DeferredSalesInducementsNet	67183000	usd
CY2023Q1	us-gaap	Deferred Sales Inducements Net DeferredSalesInducementsNet	82004000	usd
CY2023Q4	us-gaap	Value Of Business Acquired Voba ValueOfBusinessAcquiredVOBA	129905000	usd
CY2022Q4	us-gaap	Value Of Business Acquired Voba ValueOfBusinessAcquiredVOBA	138495000	usd
CY2024Q1	us-gaap	Present Value Of Future Insurance Profits Amortization Expense1 PresentValueOfFutureInsuranceProfitsAmortizationExpense1	2078000	usd
CY2023Q1	us-gaap	Present Value Of Future Insurance Profits Amortization Expense1 PresentValueOfFutureInsuranceProfitsAmortizationExpense1	2213000	usd
CY2024Q1	us-gaap	Present Value Of Future Insurance Profit Experience Adjustment PresentValueOfFutureInsuranceProfitExperienceAdjustment	0	usd
CY2023Q1	us-gaap	Present Value Of Future Insurance Profit Experience Adjustment PresentValueOfFutureInsuranceProfitExperienceAdjustment	0	usd
CY2024Q1	us-gaap	Value Of Business Acquired Voba ValueOfBusinessAcquiredVOBA	127827000	usd
CY2023Q1	us-gaap	Value Of Business Acquired Voba ValueOfBusinessAcquiredVOBA	136282000	usd
CY2024Q1	us-gaap	Present Value Of Future Insurance Profits Amortization Expense Remainder Of Fiscal Year PresentValueOfFutureInsuranceProfitsAmortizationExpenseRemainderOfFiscalYear	6077000	usd
CY2024Q1	us-gaap	Present Value Of Future Insurance Profits Amortization Expense Year One PresentValueOfFutureInsuranceProfitsAmortizationExpenseYearOne	7743000	usd
CY2024Q1	us-gaap	Present Value Of Future Insurance Profits Amortization Expense Year Two PresentValueOfFutureInsuranceProfitsAmortizationExpenseYearTwo	7331000	usd
CY2024Q1	us-gaap	Present Value Of Future Insurance Profits Amortization Expense Year Three PresentValueOfFutureInsuranceProfitsAmortizationExpenseYearThree	6945000	usd
CY2024Q1	us-gaap	Present Value Of Future Insurance Profits Amortization Expense Year Four PresentValueOfFutureInsuranceProfitsAmortizationExpenseYearFour	6578000	usd
CY2024Q1	nwli	Cost Of Reinsurance CostOfReinsurance	65042000	usd
CY2023Q1	nwli	Cost Of Reinsurance CostOfReinsurance	75303000	usd
CY2024Q1	nwli	Liability For Policyholder Account Balances Before Reinsurance LiabilityForPolicyholderAccountBalancesBeforeReinsurance	6729842000	usd
CY2023Q1	nwli	Liability For Policyholder Account Balances Before Reinsurance LiabilityForPolicyholderAccountBalancesBeforeReinsurance	7503656000	usd
CY2024Q1	us-gaap	Policyholder Funds PolicyholderFunds	3260378000	usd
CY2023Q1	us-gaap	Policyholder Funds PolicyholderFunds	3652095000	usd
CY2024Q1	us-gaap	Additional Liability Long Duration Insurance Before Reinsurance After Discount Rate Change AdditionalLiabilityLongDurationInsuranceBeforeReinsuranceAfterDiscountRateChange	161319000	usd
CY2023Q1	us-gaap	Additional Liability Long Duration Insurance Before Reinsurance After Discount Rate Change AdditionalLiabilityLongDurationInsuranceBeforeReinsuranceAfterDiscountRateChange	150688000	usd
CY2024Q1	us-gaap	Additional Liability Long Duration Insurance Gross Premium Income AdditionalLiabilityLongDurationInsuranceGrossPremiumIncome	23997000	usd
CY2024Q1	us-gaap	Additional Liability Long Duration Insurance Interest Income Expense AdditionalLiabilityLongDurationInsuranceInterestIncomeExpense	2066000	usd
CY2023Q1	us-gaap	Additional Liability Long Duration Insurance Gross Premium Income AdditionalLiabilityLongDurationInsuranceGrossPremiumIncome	27396000	usd
CY2023Q1	us-gaap	Additional Liability Long Duration Insurance Interest Income Expense AdditionalLiabilityLongDurationInsuranceInterestIncomeExpense	651000	usd
CY2024Q1	us-gaap	Liability For Future Policy Benefits Life LiabilityForFuturePolicyBenefitsLife	899544000	usd
CY2023Q1	us-gaap	Liability For Future Policy Benefits Life LiabilityForFuturePolicyBenefitsLife	930147000	usd
CY2024Q1	us-gaap	Liability For Future Policy Benefit Gross Premium Income LiabilityForFuturePolicyBenefitGrossPremiumIncome	23543000	usd
CY2024Q1	us-gaap	Liability For Future Policy Benefit Interest Expense LiabilityForFuturePolicyBenefitInterestExpense	9660000	usd
CY2023Q1	us-gaap	Liability For Future Policy Benefit Gross Premium Income LiabilityForFuturePolicyBenefitGrossPremiumIncome	22714000	usd
CY2023Q1	us-gaap	Liability For Future Policy Benefit Interest Expense LiabilityForFuturePolicyBenefitInterestExpense	9806000	usd
CY2024Q1	us-gaap	Liability For Future Policy Benefit Expected Future Gross Premium Undiscounted Before Reinsurance LiabilityForFuturePolicyBenefitExpectedFutureGrossPremiumUndiscountedBeforeReinsurance	1572723000	usd
CY2024Q1	us-gaap	Liability For Future Policy Benefit Expected Future Policy Benefit Undiscounted Before Reinsurance LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitUndiscountedBeforeReinsurance	2838102000	usd
CY2023Q1	us-gaap	Liability For Future Policy Benefit Expected Future Gross Premium Undiscounted Before Reinsurance LiabilityForFuturePolicyBenefitExpectedFutureGrossPremiumUndiscountedBeforeReinsurance	1609871000	usd
CY2023Q1	us-gaap	Liability For Future Policy Benefit Expected Future Policy Benefit Undiscounted Before Reinsurance LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitUndiscountedBeforeReinsurance	2867527000	usd
CY2024Q1	us-gaap	Market Risk Benefit Asset Amount MarketRiskBenefitAssetAmount	39474000	usd
CY2024Q1	us-gaap	Market Risk Benefit Liability Amount MarketRiskBenefitLiabilityAmount	261912000	usd
CY2024Q1	us-gaap	Market Risk Benefit Net Amount At Risk MarketRiskBenefitNetAmountAtRisk	222438000	usd
CY2023Q1	us-gaap	Market Risk Benefit Asset Amount MarketRiskBenefitAssetAmount	41759000	usd
CY2023Q1	us-gaap	Market Risk Benefit Liability Amount MarketRiskBenefitLiabilityAmount	253116000	usd
CY2023Q1	us-gaap	Market Risk Benefit Net Amount At Risk MarketRiskBenefitNetAmountAtRisk	211357000	usd
CY2024Q1	nwli	Defined Benefit Plan Number Of Non Qualified Defined Benefit Pension Plan DefinedBenefitPlanNumberOfNonQualifiedDefinedBenefitPensionPlan	3	benefit_plan
CY2024Q1	nwli	Defined Benefit Plans Number Of Healthcare Plans DefinedBenefitPlansNumberOfHealthcarePlans	2	benefit_plan
CY2024Q1	nwli	Premiums Earned And Policy Charges PremiumsEarnedAndPolicyCharges	57228000	usd
CY2023Q1	nwli	Premiums Earned And Policy Charges PremiumsEarnedAndPolicyCharges	56933000	usd
CY2024Q1	us-gaap	Net Investment Income NetInvestmentIncome	134361000	usd
CY2023Q1	us-gaap	Net Investment Income NetInvestmentIncome	89909000	usd
CY2024Q1	us-gaap	Other Income OtherIncome	5985000	usd
CY2023Q1	us-gaap	Other Income OtherIncome	5705000	usd
CY2024Q1	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-8000	usd
CY2023Q1	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	67000	usd
CY2024Q1	us-gaap	Revenues Revenues	197566000	usd
CY2023Q1	us-gaap	Revenues Revenues	152614000	usd
CY2024Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	19670000	usd
CY2023Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2991000	usd
CY2024Q1	us-gaap	Net Income Loss NetIncomeLoss	73608000	usd
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	12304000	usd
CY2024Q1	us-gaap	Assets Assets	12116444000	usd
CY2023Q4	us-gaap	Assets Assets	12250615000	usd
CY2016	nwli	Share Based Compensation Arrangement By Share Based Payment Award Options Extensions In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExtensionsInPeriod	P10Y
CY2024Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	0	shares
CY2023Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	0	shares
CY2024Q1	us-gaap	Deferred Compensation Sharebased Arrangements Liability Current And Noncurrent DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent	63800000	usd
CY2023Q4	us-gaap	Deferred Compensation Sharebased Arrangements Liability Current And Noncurrent DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent	64800000	usd
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	291000	shares
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	0	shares
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	0
CY2024Q1	nwli	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Issued For Exercises Of Options ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesIssuedForExercisesOfOptions	0	shares
CY2024Q1	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	0	shares
CY2024Q1	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	0
CY2024Q1	nwli	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Forfeited ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesForfeited	0	shares
CY2024Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	0	shares
CY2024Q1	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	0
CY2024Q1	nwli	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Expired ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesExpired	0	shares
CY2024Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod	0	shares
CY2024Q1	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice	0
CY2024Q1	nwli	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Issued From Stock Option Grants ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesIssuedFromStockOptionGrants	0	shares
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CY2024Q1	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	0
CY2024Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	291000	shares
CY2024Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	0	shares
CY2024Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	0
CY2024Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	6600000	usd
CY2023Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	1000000	usd
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CY2023Q1	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested In Period Fair Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1	0	usd
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CY2024Q1	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Outstanding Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions	210493	shares
CY2024Q1	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Exercisable Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions	117719	shares
CY2024Q1	nwli	Business Acquisition Assumed Share Price BusinessAcquisitionAssumedSharePrice	500.00
CY2024Q1	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	5600000	usd
CY2023Q1	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	-2300000	usd
CY2024Q1	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1200000	usd
CY2023Q1	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	-500000	usd
CY2024Q1	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Share Based Awards Other Than Options EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions	5600000	usd
CY2024Q1	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P0Y3M
CY2024Q1	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	3000	usd
CY2023Q1	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	67000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	11000	usd
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CY2024Q1	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-8000	usd
CY2023Q1	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	67000	usd
CY2024Q1	nwli	Investments Percentage Of Gains On Bonds Due To Calls Of Securities InvestmentsPercentageOfGainsOnBondsDueToCallsOfSecurities	1.000
CY2023Q1	nwli	Investments Percentage Of Gains On Bonds Due To Calls Of Securities InvestmentsPercentageOfGainsOnBondsDueToCallsOfSecurities	0.047
CY2024Q1	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	7712847000	usd
CY2024Q1	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	6748000	usd
CY2024Q1	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	648042000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	7071553000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	7714503000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	9811000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	616126000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	7108188000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	374510000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	7956000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	6241804000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	640086000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	6616314000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	648042000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	224892000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	4170000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	6439386000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	611956000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	6664278000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	616126000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities Next Rolling Twelve Months Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis	954486000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities Next Rolling Twelve Months Fair Value AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue	942367000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Two Through Five Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis	2366855000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Two Through Five Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue	2285704000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Six Through Ten Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis	1179151000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Six Through Ten Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue	1061340000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities Rolling After Year Ten Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis	1956012000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities Rolling After Year Ten Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue	1603194000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	6456504000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate	5892605000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost	1256343000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue	1178948000	usd
CY2024Q1	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	7712847000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	7071553000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	usd
CY2024Q1	nwli	Debt Securities Available For Sale Allowance For Credit Loss Fair Value DebtSecuritiesAvailableForSaleAllowanceForCreditLossFairValue	0	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Amortized Cost After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostAfterAllowanceForCreditLoss	7712847000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	7071553000	usd
CY2024Q1	us-gaap	Mortgage Loans On Real Estate Other Additions MortgageLoansOnRealEstateOtherAdditions	0	usd
CY2023Q1	us-gaap	Mortgage Loans On Real Estate Other Additions MortgageLoansOnRealEstateOtherAdditions	1800000	usd
CY2023	us-gaap	Mortgage Loans On Real Estate Other Additions MortgageLoansOnRealEstateOtherAdditions	6800000	usd
CY2024Q1	nwli	Number Of Mortgage Loan Investments Funds Withheld Reinsurance Agreement NumberOfMortgageLoanInvestmentsFundsWithheldReinsuranceAgreement	3	investment
CY2023	nwli	Number Of Mortgage Loan Investments Funds Withheld Reinsurance Agreement NumberOfMortgageLoanInvestmentsFundsWithheldReinsuranceAgreement	3	investment
CY2022Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	565003000	usd
CY2024Q1	nwli	Derivative Liability Statement Of Financial Position Extensible Enumeration Not Disclosed Flag DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumerationNotDisclosedFlag	Policyholder account balances (a)
CY2024Q1	nwli	Transfer From Level2 To Level3 For Liabilities TransferFromLevel2ToLevel3ForLiabilities	0	usd
CY2024Q1	nwli	Transfer From Level2 To Level3 For Debt Securities Available For Sale TransferFromLevel2ToLevel3ForDebtSecuritiesAvailableForSale	0	usd
CY2024Q1	nwli	Transfer From Level2 To Level3 For Debt Securities Available For Sale TransferFromLevel2ToLevel3ForDebtSecuritiesAvailableForSale	0	usd
CY2023Q4	nwli	Derivative Liability Statement Of Financial Position Extensible Enumeration Not Disclosed Flag DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumerationNotDisclosedFlag	Policyholder account balances (a)
CY2023Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	762585000	usd
CY2024Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	42214000	usd
CY2024Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	-2928000	usd
CY2024Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	43658000	usd
CY2024Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	71268000	usd
CY2024Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	774261000	usd
CY2024Q1	us-gaap	Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss	41335000	usd
CY2024Q1	us-gaap	Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss	41335000	usd
CY2023Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	635307000	usd
CY2024Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Gain Loss Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings	-36223000	usd
CY2024Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases	13348000	usd
CY2024Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Issues FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues	97000	usd
CY2024Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements	22311000	usd
CY2024Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	662664000	usd
CY2024Q1	us-gaap	Fair Value Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss	21091000	usd
CY2022Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	629035000	usd
CY2023Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	4712000	usd
CY2023Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	6606000	usd
CY2023Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	59520000	usd
CY2023Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	6838000	usd
CY2023Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	693035000	usd
CY2023Q1	us-gaap	Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss	5012000	usd
CY2023Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Gain Loss Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings	-37618000	usd
CY2023Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Gain Loss Included In Other Comprehensive Income FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome	0	usd
CY2023Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases	12631000	usd
CY2023Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales	0	usd
CY2023Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Issues FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues	22000	usd
CY2023Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements	984000	usd
CY2023Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Transfers Net FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet	0	usd
CY2023Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	614290000	usd
CY2023Q1	us-gaap	Fair Value Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss	47037000	usd
CY2024Q1	nwli	Number Of Coinsurance Funds Withheld Reinsurance Agreements NumberOfCoinsuranceFundsWithheldReinsuranceAgreements	2	agreement
CY2024Q1	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	9600000	usd
CY2024Q1	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	3769000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	9600000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	3587000	usd
CY2024Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear	547000	usd
CY2024Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	730000	usd
CY2024Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	232000	usd
CY2024Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	187000	usd
CY2024Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	187000	usd
CY2024Q1	nwli	Finite Lived Intangible Asset Expected Amortization After Year Four FiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour	948000	usd
CY2023Q4	us-gaap	Goodwill Gross GoodwillGross	13864000	usd
CY2022Q4	us-gaap	Goodwill Gross GoodwillGross	13864000	usd
CY2024Q1	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	0	usd
CY2023	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	0	usd
CY2024Q1	us-gaap	Goodwill Gross GoodwillGross	13864000	usd
CY2023Q4	us-gaap	Goodwill Gross GoodwillGross	13864000	usd
CY2023Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	0	usd
CY2022Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	0	usd
CY2024Q1	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	usd
CY2023	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	usd
CY2024Q1	us-gaap	Goodwill Goodwill	13864000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	13864000	usd

Files In Submission

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National Western Life Group, Inc.

2024 Q1 Form 10-Q Financial Statement

#000163598424000015 Filed on May 09, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission