Equity Components [Axis] Common Stock [Member] Additional Paid-In Capital [Member] Accumulated Other Comprehensive Income (Loss) [Member] Retained Earnings [Member] Geographical [Axis] MICHIGAN TEXAS CALIFORNIA PENNSYLVANIA IOWA FLORIDA INDIANA WISCONSIN WASHINGTON Investment Type [Axis] US Government Agencies Debt Securities [Member] Domestic Corporate Securities [Member] Residential Mortgage Backed Securities [Member] Foreign Corporate Securities [Member] Debt Securities [Member] Maturities [Axis] Due After One Year Through Ten Years [Member] Due After Ten Years [Member] Cash and Cash Equivalents [Member] Deferred Income Taxes [Member] Derivative Fair Value Hierarchy and NAV [Axis] Level 3 [Member] Fair Value By Measurement Frequency [Axis] Recurring [Member] Separate Account Assets [Member] Product and Service [Axis] Life and Health [Member] Segments [Axis] Annuities [Member] Life and Health [Member] Related Party [Axis] CMFG Life Insurance Company [Member] Other Related Parties CUNA Brokerage Services, Inc [Member] Level 1 [Member] Fair Value, Inputs, Level 2 [Member] Domestic Corporate Securities [Member] Foreign Corporate Securities [Member] Type of Arrangement and Non-arrangement Transactions [Axis] Reinsurance Agreement [Member] Second Agreement [Member] Amended Reinsurance Agreement [Member] Valuation Approach and Technique [Axis] Discounted Cash Flow [Member] Measurement Input Type [Axis] Lapse Rate [Member] Single Premium Deferred Index Annuity [Member] Range [Axis] Minimum [Member] Maximum [Member] Weighted Average [Member] Credit And Risk Margin [Member] Flexible Premium Variable And Index Linked Deferred Annuity [Member] Two Securities [Member] Nonrecurring [Member] Measurement Basis [Axis] Carrying Amount [Member] Estimate Fair Value [Member] Consolidated Entities [Axis] CUNA Mutual Investment Corporation [Member] Subsequent Event Type [Axis] Subsequent Event [Member] Document And Entity Information Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Current Fiscal Year End Date Trading Symbol Entity a Well-known Seasoned Issuer Entity a Voluntary Filer Entity's Reporting Status Current Entity Filer Category Entity Small Business Emerging Growth Company Entity Ex Transition Period Entity Shell Company Amendment Flag Entity Common Stock, Shares Outstanding Entity Public Float Document Fiscal Year Focus Document Fiscal Period Focus Statement of Financial Position [Abstract] Assets Investments Debt securities, available for sale, at fair value (amortized cost 2018- $29,856; 2017 - $10,650) Total investments Cash and cash equivalents Accrued investment income Reinsurance recoverable from affiliate Assets on deposit Premiums receivable, net Net deferred tax asset Receivable from affiliate Other assets and receivables Federal income taxes recoverable from affiliate Separate account assets Total assets Liabilities and Stockholder's Equity Liabilities Claim and policy benefit reserves - life and health Policyholder account balances Payables to affiliates Accounts payable and other liabilities Separate account liabilities Total liabilities Commitments and contingencies (Note 11) Stockholder's equity Common stock, $5 par value, authorized 1,000 shares; issued and outstanding 1,000 shares Additional paid in capital Accumulated other comprehensive income (loss), net of tax expense (benefit) (2018 - ($61); 2017 - $6) Retained earnings Total stockholder's equity Total liabilities and stockholder's equity Available-for-sale debt securities, amortized cost basis Common stock, par value (in dollars per shares) Common stock, authorized Common stock, issued Common stock, outstanding Tax expense (benefit) in accumulated other comprehensive income Statement of Comprehensive Income [Abstract] Life and health premiums, net Net investment income Net realized investment (losses) Other income Total revenues Benefits and expenses Life and health insurance claims and benefits, net Interest credited to policyholder account balances, net Operating and other expenses Total benefits and expenses Income before income taxes Income tax expense (benefit) Net income Change in unrealized gains (losses), net of tax expense (benefit) (2018 - ($50); 2017 - $181; 2016 - ($53)) Reclassification adjustment for (gains) included in net income, net of tax (benefit) (2018 - ($14)) Other comprehensive income (loss) Total comprehensive income Tax expense (benefit) portion of change in unrealized gains (losses) Tax Expense (Benefit), Portion of reclassification adjustment for (gains) Statement [Table] Statement [Line Items] Balance Net income Other comprehensive (loss) Capital contribution Dividend to parent Cumulative effect of reclassification for stranded tax effects Balance Statement of Cash Flows [Abstract] Cash flows from operating activities: Adjustments to reconcile net income to net cash provided by (used in) operating activities: Net realized investment losses Interest credited to policyholder account balances Deferred income taxes Amortization of bond premium and discount Amortization and write off of deferred charges Changes in other assets and liabilities Accrued investment income Reinsurance recoverable from affiliate Premiums receivable Receivable from affiliate and other assets Federal income taxes recoverable from affiliate Claim and policy benefit reserves - life and health Payables to affiliates and other liabilities Net cash provided by (used in) operating activities Cash flows from investing activities: Proceeds on sale or maturity of debt securities Net cash provided by investing activities Cash flows from financing activities: Dividend to parent Policyholder account deposits Policyholder account withdrawals Assets on deposit - deposits Assets on deposit - withdrawals Change in bank overdrafts Net cash provided by (used in) financing activities Change in cash and cash equivalents Cash and cash equivalents at beginning of year Cash and cash equivalents at end of year Supplemental disclosure of cash information: Net cash paid to affiliate for income taxes Non cash receipt of securities as capital contribution from parent Organization, Consolidation and Presentation of Financial Statements [Abstract] Nature of Business Accounting Policies [Abstract] Summary of Significant Accounting Policies Investments, Debt and Equity Securities [Abstract] Investments Fair Value Disclosures [Abstract] Fair Value Income Tax Disclosure [Abstract] Income Tax Related Party Transactions [Abstract] Related Party Transactions Reinsurance Recoverables, Including Reinsurance Premium Paid [Abstract] Reinsurance Statutory Financial Data And Dividend Restrictions Statutory Financial Data and Dividend Restrictions Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Accumulated Other Comprehensive Income (Loss) Segment Reporting [Abstract] Business Segment Information Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Subsequent Events [Abstract] Subsequent Events Basis of Presentation Use of Estimates Segment Reporting Investments Assets On Deposit Derivative Financial Instruments Cash and Cash Equivalents Variable Interest Entities Recognition of Insurance Revenue and Related Benefits Other Income / Operating and Other Expenses Deferred Policy Acquisition Costs Claim and Policy Benefits Reserves - Life and Health Policyholder Account Balances Accounts Payable and Other Liabilities Reinsurance Separate Accounts Income Taxes Recently Adopted Accounting Standard Updates Accounting Standards Updates Pending Adoption Schedule of states with premiums greater than 5% Investments in Debt Securities Investments Classified by Contractual Maturity Date Investment Income Unrealized Gain (Loss) on Investments Schedule of fair value assets measured on a recurring basis Schedule of significant unobservable inputs Schedule of changes in assets and liabilities classified as Level 3 Schedule of carrying amounts and estimated fair values of the Company's financial instruments which are not measured at fair value on a recurring basis Schedule of financial instruments not measured at fair value on a recurring basis Schedule of Components of Income Tax Expense (Benefit) Schedule of Effective Income Tax Rate Reconciliation Schedule of Deferred Tax Assets and Liabilities Schedule of Related Party Transactions Effects of Reinsurance Schedule of certain statutory basis financial information Schedule of Accumulated Other Comprehensive Income (Loss) Schedule of Segment Reporting Information, by Segment Direct Life and Health Premiums greater than 5% of total direct premiums Deposits on Annuity Contracts greater than 5% of total deposits Policy loans allocated to related party Average annualized credited rate for the single premium deferred index annuity Average annualized credited rate for the risk control accounts of the flexible premium deferred variableand index linked deferred annuity Average credited interest rate Future minimum guaranteed interest rate Debt Securities, Available-for-sale, Amortized Cost Debt Securities, Available-for-sale, Unrealized Gain Debt Securities, Available-for-sale, Unrealized Loss Debt securities, available for sale, at fair value Debt Securities, Available-for-sale, Amortized Cost Debt securities, available for sale, at fair value Gross Investment Income, Operating Investment Income, Investment Expense Net Investment Income Net unrealized investment gains (losses) Proceeds from sale of debt securities Debt securities, unrealized investment loss position Unrealized loss position, under 12 months Fair value, of investment grade Description of price impairement,unrealized loss for debt securities Description of price impairment Embedded Derivatives, Assets, FV Embedded Derivatives, Liabilities, FV Embedded Derivatives, Increase (Decrease) in fair value Debt securities and cash, carrying value Securities with a fair value Debt securities, available for sale, at fair value over 12 months Debt Securities, Available-for-sale, Unrealized Loss under 12 months Price impairment Measurement Frequency [Axis] Assets, Fair Value Disclosure Financial and Nonfinancial Liabilities, Fair Value Disclosure Derivative asset (liability), measurement input Derivative asset (liability), index period Assets classified as level 3 Assets classified as level 3, Purchases Assets classified as level 3, Maturities Assets classified as level 3, Earnings Assets classified as level 3 Liabilities classified as level 3 Liabilities classified as level 3, Purchases Liabilities classified as level 3, Maturities Liabilities classified as level 3, Earnings Liabilities classified as level 3 Financial instruments recorded as assets: Cash Assets on deposit Financial instruments recorded as liabilities: Investment-type contracts Separate account liabilities Fair Value, Equity, Level 1 to Level 2 Transfers, Amount Fair Value, Equity, Level 2 to Level 1 Transfers, Amount Assets requiring fair value adjustment Liabilities requiring fair value adjustment Current tax expense (benefit) Deferred tax expense Adjustment of deferred tax assets and liabilities for enacted rate change Total income tax expense (benefit) Effective Income Tax Rate Reconciliation, Amount [Abstract] Federal Income Tax Rate, Amount Prior Year Income Taxes, Amount Deduction, Dividends, Amount Deduction, Foreign Tax Credit , Amount Adjustment of deferred tax assets and liabilities for enacted rate change, Amount Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Total Income Tax Expense (Benefit), Amount Effective Income Tax Rate Reconciliation, Percent [Abstract] Federal Statutory Income Tax Rate, Percent Prior Year Income Taxes, Percent Deduction, Dividend, Percent Deduction, Foreign Tax Credit, Percent Adjustment of deferred tax assets and liabilities for enacted rate change, Percentage Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Effective Income Tax Rate Reconciliation, Percent Deferred tax assets Tax reserves method change Unrealized investment losses Accrued expenses Deferred policy acquisition costs Other Gross deferred tax assets Deferred tax liabilities Investments Deferred reinsurance expense Unrealized investment gains Gross deferred tax liabilities Accruals for payment of interest and penalties Recognized a reduction in interest and penalties Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Due from Related Parties, Current Due to Related Parties, Current Expenses reimbursed Investment management fees Commission Expense Deferred tax liability Dividend paid in cash Face amount of policies in force Premiums Written and Earned Direct Premiums Written Direct Premiums Unearned Direct Premiums Earned Ceded Premiums Written Ceded Premiums Unearned Ceded Premiums Earned Premiums written, net Change in unearned premiums, net Premiums, net Contract revenue direct Contract revenue ceded to affiliate Contract charges, net Policyholder Benefits and Claims Incurred, Net Policyholder Benefits and Claims Incurred, Direct Policyholder Benefits and Claims Incurred, Ceded Policyholder Benefits and Claims Incurred, Net Interest credited to policyholder account balances, Direct Interest credited to policyholder account balances, Ceded to affiliate Interest credited to policyholder account balances, net Deposit contracts Related liabilities Separate Account Assets Commissions Statutory Accounting Practices, Statutory Capital and Surplus, Balance Statutory Accounting Practices, Statutory Net Income Amount Subsequent Event [Table] Subsequent Event [Line Items] 2019 dividends without prior approval Unrealized Investment Gain (Loss), Balance Unrealized Gain (Loss) on Investments Unrealized Investment Gain (Loss), Balance Accumulated Other Comprehensive Income (Loss), net of tax Effect of change for ASU 2018-02 Accumulated Other Comprehensive Income (Loss), net of tax Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Change in unrealized holding gains (losses), net of tax Revenues Life and health premiums, net Net investment income Net realized investment (losses) Other Income Total benefits and expenses Income (loss) before income taxes Net Income (Loss) Change in unrealized gains, net of tax expense (benefit) Reclassification adjustment for (gains) included in net income, net of tax (benefit) Other Comprehensive Income (Loss) Total Comprehensive Income (Loss) Guaranty fund assessments Recoveries of assessments from premium taxes Represents the monetary amount of Tax expense (benefit) in Accumulated Other Comprehensive Income, as of the indicated date. Represents the monetary amount of Tax expense (benefit) portion of change in unrealized gains (losses), during the indicated time period. Represents the monetary amount of TaxExpenseBenefitPortionOfReclassificationAdjustmentForGains, as of the indicated date. Represents the monetary amount of Amortization of bond premium and discount, during the indicated time period. Represents the monetary amount of Amortization and write off of deferred charges, during the indicated time period. Represents the monetary amount of Claim and policy benefit reserves - life and health, during the indicated time period. Represents the monetary amount of Policyholder account deposits, during the indicated time period. Represents the monetary amount of Policyholder account withdrawals, during the indicated time period. Represents the monetary amount of Assets on deposit - deposits, during the indicated time period. Represents the monetary amount of Assets on deposit - withdrawals, during the indicated time period. Represents the monetary amount of Change in bank overdrafts, during the indicated time period. Represents the monetary amount of Net cash paid to affiliate for income taxes, during the indicated time period. The amount refers to non cash receipt of securities as capital contribution from parent. Represents the textual narrative disclosure of Assets On Deposit, during the indicated time period. Represents the textual narrative disclosure of Variable Interest Entities, during the indicated time period. Represents the textual narrative disclosure of Policyholder Account Balances, during the indicated time period. Represents the textual narrative disclosure of Separate Accounts, during the indicated time period. Represents the textual narrative disclosure of Recently Adopted Accounting Standard Updates, during the indicated time period. Represents the monetary amount of Unrealized Investment Gain (Loss), Balance, as of the indicated date. Represents the textual narrative disclosure of Schedule of states with premiums greater than 5%, during the indicated time period. Represents the textual narrative disclosure of Schedule of changes in assets and liabilities classified as Level 3, during the indicated time period. Represents the textual narrative disclosure of Carrying amounts and estimated fair values of the Company's financial instruments which are not measured at fair value on a recurring basis, during the indicated time period. Represents the textual narrative disclosure of Schedule of certain statutory basis financial information, during the indicated time period. Represents the Direct Life and Health Premiums greater than 5% of total direct premiums, during the indicated time period. Represents the Deposits on Annuity Contracts greater than 5% of total deposits, during the indicated time period. Represents the monetary amount of Policy loans allocated to related party, as of the indicated date. Represents the Average annualized credited rate for the single premium deferred annuity, during the indicated time period. Represents the Average annualized credited rate for the risk control accounts of the flexible premium deferred variable and index linked deferred annuity, during the indicated time period. Represents the Average credited interest rate, during the indicated time period. Represents the Future minimum guaranteed interest rate, during the indicated time period. Represents the description of Maturities, during the indicated time period. Represents the Maturities, during the indicated time period. Represents corporate debt securities member. Represents due after one year through ten years member. Represents the Due after ten years, during the indicated time period. Represents the monetary amount of Proceeds from sale of debt securities, during the indicated time period. Represents Deferred Income taxes, during the indicated time period. Represents the monetary amount of Net unrealized investment gains included in AOCI, as of the indicated date. Represents the monetary amount of Embedded Derivatives, Assets, as of the indicated date. Represents the monetary amount of Embedded Derivatives, Liabilities, as of the indicated date. Represents the monetary amount of Embedded Derivatives, Increase (Decrease) in fair value, during the indicated time period. Represents the monetary amount of Assets requiring fair value adjustment, as of the indicated date. Represents the monetary amount of Liabilities requiring fair value adjustment, as of the indicated date. Represents the monetary amount of Assets classified as level 3, as of the indicated date. Represents the monetary amount of Assets classified as level 3, Purchases, during the indicated time period. Represents the monetary amount of Assets classified as level 3, Maturities, during the indicated time period. Represents the monetary amount of Assets classified as level 3, Earnings, during the indicated time period. Represents the monetary amount of Liabilities classified as level 3, as of the indicated date. Represents the monetary amount of Liabilities classified as level 3, Purchases, during the indicated time period. Represents the monetary amount of Liabilities classified as level 3, Maturities, during the indicated time period. Represents the monetary amount of Liabilities classified as level 3, Earnings, during the indicated time period. Represents the Assets on deposit, during the indicated time period. Represents the Separate Account Assets, during the indicated time period. Represnets foreign tax credit amount. Represents Foreign Tax Credit amount. Represents the monetary amount of Adjustment of deferred tax assets and liabilities for enacted rate change, during the indicated time period. Represents the Adjustment of deferred tax assets and labilities for enacted rate change, percent, during the indicated time period. Represents the monetary amount of Total Income Tax Expense (Benefit), during the indicated time period. Represents the monetary amount of Accruals for payment of interest and penalties, as of the indicated date. Represents recognized a reduction in interest and penalties . Represents the Annuities, during the indicated time period. Represents the Life and Health, during the indicated time period. The amount refers to debt securities net realized investment losses. Represents the monetary amount of Change in unrealized gains (losses), net of tax (benefit), during the indicated time period. The amount refers to reclassification adjustment for gains included in net income. Represents the monetary amount of Shared Expenses reimbursed, during the indicated time period. Represents the monetary amount of Investment management fees, during the indicated time period. Represents the information pertaining to CMFG life insurance company0 Represents the information of other related parties. Represent the cuna brokerage service inc. Represents the monetary amount of Face amount of policies in force, during the indicated time period. Represents the monetary amount of Direct Premiums Unearned, during the indicated time period. Represents the monetary amount of Ceded Premiums Unearned, during the indicated time period. Represents the monetary amount of Premiums written, net, during the indicated time period. Represents the monetary amount of Change in unearned premiums, net, during the indicated time period. Represents the monetary amount of Premiums, Net, during the indicated time period. Represents the monetary amount of Contract revenue direct, during the indicated time period. Represents the monetary amount of Contract revenue ceded to affiliate, during the indicated time period. Represents the monetary amount of Interest credited to policyholder account balances ceded to affiliate, during the indicated time period. Represents the monetary amount of Interest credited to policyholder account balances, ceded to affiliate, during the indicated time period. Represents the domestic corporate securities. Represents the foreign corporate securities. Represents the reinsurance agreement. Represents the second agreement. Represents the amended reinsurance agreement. Amount refers to effect of changes for ASU. Represents the method of determining impairments of present value of future insurance. The amount refers to change in unrealized holding gains losses net of tax. Represents of derivative asset liability net index period. Represents the monetary amount of Tax reserves method change, during the indicated time period. Represents the monetary amount of Deferred Tax Liabilities, Deferred Insurance Expense, during the indicated time period. Represents the monetary amount of Unrealized investment gains, during the indicated time period. Represents to two debt securitues. Represents the capital contribution. Amount refers to adjusments to additional paid in capital reclassification for standard tax effects. Amount refers to seperate account liabilities at fair value. Information about CUNA Mutual Investment Corporation Member. The amount of dividend paid in cash. The amount represent net of contract revenue. Represent information of price impairment percentage. Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. Life and Health DomesticCorporateSecuritiesMember ForeignCorporateSecuritiesMember Investments [Default Label] Assets [Default Label] Liabilities [Default Label] Stockholders' Equity Attributable to Parent Revenues [Default Label] Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Dividends Increase (Decrease) in Accrued Investment Income Receivable Increase (Decrease) in Reinsurance Recoverable Increase (Decrease) in Premiums Receivable Increase (Decrease) in Other Operating Assets Increase (Decrease) in Income Taxes Claim and policy benefit reserves - life and health {1} Net Cash Provided by (Used in) Operating Activities Net Cash Provided by (Used in) Investing Activities Payments of Ordinary Dividends Policyholder account deposits Assets on deposit - deposits Change in bank overdrafts Net Cash Provided by (Used in) Financing Activities Cash and Cash Equivalents, Period Increase (Decrease) Cash and Cash Equivalents, at Carrying Value Investment [Text Block] Investment, Policy [Policy Text Block] Reinsurance Accounting Policy [Policy Text Block] Investment Income, Investment Expense Assets classified as level 3 Liabilities classified as level 3 Investments, Fair Value Disclosure SeparateAccountLiabilitiesAtFairValueAmount Effective Income Tax Rate Reconciliation, Deduction, Dividends, Amount EffectiveIncomeTaxRateReconciliationDeductionsForeignTaxCredits Total Income Tax Expense (Benefit) Effective Income Tax Rate Reconciliation, Deduction, Dividend, Percent Effective Income Tax Rate Reconciliation, Percent Deferred Tax Assets, Gross Deferred Tax Liabilities, Investments Direct Premiums Earned Ceded Premiums Written Ceded Premiums Earned Premiums, Net ContractChargesNet Policyholder Benefits and Claims Incurred, Ceded Policyholder Benefits and Claims Incurred, Net [Default Label] Unrealized Investment Gain (Loss), Balance Unrealized Gain (Loss) on Investments [Default Label] Revenue from Contract with Customer, Including Assessed Tax Investment Income, Net DebtSecuritiesNetRealizedInvestmentLosses