Fixed Maturity and Equity Securities with Unrealized Losses by Length of Time [Abstract] Fixed Maturity and Equity Securities with Unrealized Losses by Length of Time [Abstract] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Investment Sector [Axis] Investment Sector [Axis] Investment Sector [Domain] Investment Sector [Domain] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] Debt Securities [Member] Debt Securities [Member] Corporate (2) Corporate Debt Securities [Member] Residential mortgage-backed Residential Mortgage Backed Securities [Member] Mortgage-backed Securities, Issued by Private Enterprises Mortgage-backed Securities, Issued by Private Enterprises [Member] Commercial mortgage-backed Commercial Mortgage Backed Securities [Member] Other asset-backed Asset-backed Securities, Securitized Loans and Receivables [Member] United States Government and agencies US Treasury and Government [Member] States and political subdivisions US States and Political Subdivisions Debt Securities [Member] Equity Securities [Member] Equity Securities [Member] Non-redeemable preferred stocks Nonredeemable Preferred Stock [Member] Common stocks Common Stock [Member] Schedule of Available-for-sale Securities [Line Items] Schedule of Available-for-sale Securities [Line Items] Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss Percent of Total percent of total Percent of total fixed maturities Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions Available For Sale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Issuers Available For Sale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Issuers Available For Sale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Issuers Available for sale Securities Continuous Unrealized Loss Position Maximum Loss by issuer Available for sale Securities Continuous Unrealized Loss Position Maximum Loss by issuer Available for sale Securities Continuous Unrealized Loss Position Maximum Loss by issuer Document and Entity Information [Abstract] Document and Entity Information [Abstract] Document Information [Table] Document Information [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Common Class A Common Class A [Member] Common Class B Common Class B [Member] Document Information, Document [Axis] Document Information, Document [Axis] Document [Domain] Document [Domain] Document Information [Line Items] Document Information [Line Items] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Public Float Entity Public Float Retirement Benefits [Abstract] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plan, Asset Categories [Axis] Defined Benefit Plan, Asset Categories [Axis] Plan Asset Categories [Domain] Plan Asset Categories [Domain] Group annuity contract Group annuity contract [Member] Group annuity contract - contract value is equivalent to fair value, as the interest-crediting rates are periodically reset to market at the discretion of the issuer [Member] Funded annuity contracts Funded annuity contract [Member] Funded annuity contract - represents group members for whom a fully funded annuity was purchased for them individually [Member] Limited partnerships Limited partnership [Member] Limited partnership [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Significant unobservable inputs (Level 3) Fair Value, Inputs, Level 3 [Member] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] Fair Value of Plan Assets beginning of period Defined Benefit Plan, Fair Value of Plan Assets Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchases, Sales, and Settlements Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchases, Sales, and Settlements Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Still Held Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Still Held Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Sold Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Sold Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Assets Transferred into (out of) Level 3 Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Assets Transferred into (out of) Level 3 Fair Value of Plan Assets, End of period Schedule III. Supplementary Insurance Information [Abstract] Schedule III. Supplementary Insurance Information [Abstract] Supplementary Insurance Information, for Insurance Companies Disclosure [Text Block] Supplementary Insurance Information, for Insurance Companies Disclosure [Text Block] Income Taxes [Abstract] Income Taxes [Abstract] Effective Income Tax Rate Reconciliation, Disposition of Asset, Amount Effective Income Tax Rate Reconciliation, Disposition of Asset, Amount Tax benefits from equity-based compensation deductions Tax benefits from equity-based compensation deductions Tax benefits from equity-based compensation deductions Variable Interest entities [Abstract] Variable Interest entities [Abstract] Investment Holdings [Table] Investment Holdings [Table] Variable Interest Entities [Axis] Variable Interest Entities [Axis] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Classification [Domain] LIHTC Low income housing tax credits [Member] Investments in low income housing tax credits, as part of our equity method investments [Member] Investment companies Investment companies [Member] Investment in investment companies, as part of our equity method investments. Real estate limited partnerships Real estate limited partnerships [Member] Investments in real estate limited partnerships, as part of our equity method investments [Member] Other Other VIE investments [Member] Investments in other VIE investments, as part of our equity method investments [Member] Investment Holdings [Line Items] Investment Holdings [Line Items] Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Segment Information [Abstract] Segment Information [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Segments [Axis] Segments [Axis] Segment [Domain] Segments [Domain] Annuity Annuity Segment [Member] Annuity Segment [Member] Life Insurance Life Insurance Product Line [Member] Corporate and Other Corporate and Other [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Pre-Tax on Equity Income (Loss) Pre-Tax on Equity Income (Loss) Pre-Tax on Equity Income (Loss) Income Tax on Equity Income Income Tax on Equity Income Income Tax on Equity Income Equity income, net of related income taxes Income (Loss) from Equity Method Investments Significant Accounting Policies [Abstract] Significant Accounting Policies [Abstract] Consolidation, Policy Consolidation, Policy [Policy Text Block] Marketable Securities, Policy Marketable Securities, Policy [Policy Text Block] Investment, Policy Investment, Policy [Policy Text Block] Fair Value of Financial Instruments, Policy Fair Value of Financial Instruments, Policy [Policy Text Block] Cash and Cash Equivalents, Policy Cash and Cash Equivalents, Policy [Policy Text Block] Reinsurance Accounting Policy Reinsurance Accounting Policy [Policy Text Block] Capitalization of Deferred Policy Acquisition Costs, Policy Deferred Policy Acquisition Costs, Policy [Policy Text Block] Depreciation, Depletion, and Amortization, Policy Depreciation, Depletion, and Amortization [Policy Text Block] Goodwill and Intangible Assets, Policy Goodwill and Intangible Assets, Policy [Policy Text Block] Future Policy Benefits Liability, Policy Future Policy Benefits Liability, Policy [Policy Text Block] Revenue Recognition, Deferred Revenue, Policy Revenue Recognition, Deferred Revenue [Policy Text Block] Policyholders' Dividend, Policy Policyholders' Dividend [Policy Text Block] Income Tax, Policy Income Tax, Policy [Policy Text Block] Policyholder Accounts, Policy Policyholder Accounts, Policy [Policy Text Block] Revenue Recognition, Premiums Earned, Policy Revenue Recognition, Premiums Earned, Policy [Policy Text Block] Other Income and Other Expenses, Policy Other Income and Other Expenses [Policy Text Block] Other Income and Other Expenses [Policy Text Block] Pension and Other Postretirement Plans, Policy Pension and Other Postretirement Plans, Policy [Policy Text Block] Share-based Compensation, Option and Incentive Plans Policy Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Comprehensive Income, Policy Comprehensive Income, Policy [Policy Text Block] Use of Estimates, Policy Use of Estimates, Policy [Policy Text Block] Supplementary Insurance Information, by Segment [Table] Supplementary Insurance Information, by Segment [Table] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Scenario, Adjustment [Member] Scenario, Adjustment [Member] Life Insurance Life Segment [Member] Life Segment [Member] Supplementary Insurance Information, by Segment [Line Items] Supplementary Insurance Information, by Segment [Line Items] Supplementary Insurance Information, Deferred Policy Acquisition Costs Supplementary Insurance Information, Deferred Policy Acquisition Costs Supplementary Insurance Information, Liability for Future Policy Benefits, Losses, Claims and Loss Expense Reserves Supplementary Insurance Information, Liability for Future Policy Benefits, Losses, Claims and Loss Expense Reserves Supplementary Insurance Information, Unearned Premiums Supplementary Insurance Information, Unearned Premiums Supplementary Insurance Information, Other Policy Claims and Benefits Payable Supplementary Insurance Information, Other Policy Claims and Benefits Payable Supplementary Insurance Information, Premium Revenue Supplementary Insurance Information, Premium Revenue Unearned revenue reserve, amortization due to realized gains Unearned revenue reserve, amortization due to realized gains Unearned revenue reserve, amortization due to realized gains Supplementary Insurance Information, Net Investment Income Supplementary Insurance Information, Net Investment Income Investment Income, Nonoperating Investment Income, Nonoperating Supplementary Insurance Information, Benefits, Claims, Losses and Settlement Expense Supplementary Insurance Information, Benefits, Claims, Losses and Settlement Expense Deferred sales inducements, amortization due to unrealized gains losses Deferred sales inducements, amortization due to unrealized gains losses Deferred sales inducements, amortization due to unrealized gains losses Deferred sales inducements, amortization due to realized gains losses Deferred sales inducements, amortization due to realized gains losses Deferred sales inducements, amortization due to realized gains losses Supplementary Insurance Information, Amortization of Deferred Policy Acquisition Costs Supplementary Insurance Information, Amortization of Deferred Policy Acquisition Costs Deferred Policy Acquisition Cost, Amortization Expense, Unrealized Investment Gains (Losses) Deferred Policy Acquisition Cost, Unrealized Investment Gain (Loss) Deferred Policy Acquisition Cost, Amortization Expense, Net Investment Gains (Losses) Deferred Policy Acquisition Cost, Amortization Expense, Net Investment Gains (Losses) Supplementary Insurance Information, Other Operating Expense Supplementary Insurance Information, Other Operating Expense Present Value of Future Profits, amortization due to realized gains losses Present Value of Future Profits, amortization due to realized gains losses Present Value of Future Profits, amortization due to realized gains losses Fair Value Disclosures [Abstract] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Corporate Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring [Member] Fair Value, Measurements, Recurring [Member] Quoted prices in active markets for identical assets (Level 1) Fair Value, Inputs, Level 1 [Member] Significant other observable inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Estimate of Fair Value Measurement [Member] Estimate of Fair Value Measurement [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Available-for-sale Securities Available-for-sale Securities Mortgage-backed Securities Available-for-sale, Fair Value Disclosure Mortgage-backed Securities Available-for-sale, Fair Value Disclosure Other investments Derivative Asset Cash, cash equivalents and short-term investments Cash and short-term investments, fair value disclosure Cash and short-term investments, fair value disclosure Reinsurance recoverable Embedded Derivative, Fair Value of Embedded Derivative Asset Assets held in separate accounts Separate Account Assets Assets, Fair Value Disclosure Assets, Fair Value Disclosure Future policy benefits - indexed annuity embedded derivatives Liabilities Related to Investment Contracts, Fair Value Disclosure Other liabilities Other Liabilities, Fair Value Disclosure Liabilities, Fair Value Disclosure Financial and Nonfinancial Liabilities, Fair Value Disclosure Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Retirement Plan Type [Axis] Retirement Plan Type [Axis] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Other Pension Plan [Member] Other Pension Plan [Member] Pension Plan [Member] Pension Plan [Member] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan, Service Cost Defined Benefit Plan, Service Cost Defined Benefit Plan, Interest Cost Defined Benefit Plan, Interest Cost Defined Benefit Plan, Expected Return (Loss) on Plan Assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Defined Benefit Plan, Amortization of Gain (Loss) Defined Benefit Plan, Amortization of Gain (Loss) Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Net periodic pension cost individual entity share Net periodic pension cost individual entity share Net periodic pension cost individual entity share. Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit) Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year, Description Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year, Description Multiemployer Plans, Minimum Contribution Multiemployer Plans, Minimum Contribution Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months Defined Benefit Plan, Expected Future Benefit Payment, Year Two Defined Benefit Plan, Expected Future Benefit Payment, Year Two Defined Benefit Plan, Expected Future Benefit Payment, Year Three Defined Benefit Plan, Expected Future Benefit Payment, Year Three Defined Benefit Plan, Expected Future Benefit Payment, Year Four Defined Benefit Plan, Expected Future Benefit Payment, Year Four Defined Benefit Plan, Expected Future Benefit Payment, Year Five Defined Benefit Plan, Expected Future Benefit Payment, Year Five Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter Significant Accounting Policies [Text Block] Basis of Presentation and Significant Accounting Policies [Text Block] Significant Accounting Policies Investments [Text Block] Significant Accounting Policies [Text Block] Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Consolidated Balance Sheets [Abstract] Consolidated Balance Sheets [Abstract] Statement [Table] Statement [Table] Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] Parent Company [Member] Parent Company [Member] Statement [Line Items] Statement [Line Items] Available-for-sale Securities, Debt Maturities, Amortized Cost Basis Available-for-sale Debt Securities, Amortized Cost Basis Available-for-sale Equity Securities, Amortized Cost Basis Available-for-sale Equity Securities, Amortized Cost Basis Preferred stock, shares authorized Preferred Stock, Shares Authorized Preferred stock, shares issued Preferred Stock, Shares Issued Preferred stock, shares outstanding Preferred Stock, Shares Outstanding Common stock, shares authorized Common Stock, Shares Authorized Common Stock, Shares, Issued Common Stock, Shares, Issued Common stock, shares outstanding Common Stock, Shares, Outstanding Statutory Insurance Information [Abstract] Statutory Insurance Information [Abstract] Statutory insurance information [Text Block] Statutory insurance information [Text Block] Statutory insurance information Statutory Accounting Practices Disclosure [Table Text Block] Statutory Accounting Practices Disclosure [Table Text Block] Investments [Abstract] Derivative [Table] Derivative [Table] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Investment Income [Member] Investment Income [Member] Interest sensitive product charges Insurance sensitive product charges [Member] Insurance sensitive product charges [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Call options (reported in other investments) Other Investments [Member] Modified coinsurance (reported in reinsurance recoverable) Reinsurance Recoverable Including Reinsurance Premium Paid [Member] Interest-only security (reported in fixed maturities) Available-for-sale Securities [Member] Indexed annuity and universal life products (reported in liability for future policy benefits) Contract Holder Funds [Member] Modified coinsurance agreements (reported in other liabilities) Other Liabilities [Member] Derivative, by Nature [Axis] Derivative Instrument [Axis] Derivative, Name [Domain] Derivative Contract [Domain] Equity Option [Member] Equity Option [Member] Embedded Derivative Financial Instruments - MODCO [Member] Embedded Derivative Financial Instruments - MODCO [Member] Embedded Derivative Financial Instruments - MODCO [Member] Embedded Derivative Financial Instruments - Interest only Security [Member] Embedded Derivative Financial Instruments - Interest only Security [Member] Embedded Derivative Financial Instruments - Interest only Security [Member] Embedded Derivative Financial Instruments [Member] Embedded Derivative Financial Instruments [Member] Derivative [Line Items] Derivative [Line Items] Derivative Assets Derivative Liability Derivative Liability Derivative, Gain (Loss) on Derivative, Net Derivative, Gain (Loss) on Derivative, Net Fair Value Disclosure, Off-balance Sheet Risks, Amount, Asset Fair Value Disclosure, Off-balance Sheet Risks, Amount, Asset Net exposure to credit losses on derivatives Net exposure to credit losses on derivatives Net exposure to credit losses on derivatives Earnings Per Share [Abstract] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] U.S. equity funds Equity Funds [Member] International funds Private Equity Funds, Foreign [Member] Short-term fixed income funds Money Market Funds [Member] Fixed income funds Fixed Income Funds [Member] U.S. equity funds U.S. Equity Funds [Member] U.S. Equity Funds in pooled separate accounts [Member] Real estate fund Real Estate Funds [Member] Defined Benefit Plan, Fair Value of Plan Assets Assets for Plan Benefits, Defined Benefit Plan Assets for Plan Benefits, Defined Benefit Plan Liability, Defined Benefit Plan Liability, Defined Benefit Plan Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax Multiemployer unrecognized liability for underfunded status Multiemployer unrecognized liability for underfunded status Multiemployer unrecognized liability for underfunded status includes the amount that would be recognized in AOCI if the plan were a single employer plan. Schedule of Multiemployer Plans [Table] Schedule of Multiemployer Plans [Table] Award Type [Axis] Award Type [Axis] Award Type [Domain] Equity Award [Domain] Cash-based restricted stock unit plan [Member] Cash-based restricted stock unit plan [Member] Cash-based restricted stock unit plan [Member] Multiemployer Plans [Line Items] Multiemployer Plans [Line Items] Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Entity Tax Identification Number Entity Tax Identification Number Multiemployer Plan Number Multiemployer Plan Number Tax Benefit from Compensation Expense Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Multiemployer Plan, Contributions by Employer Multiemployer Plan, Contributions by Employer share based compensation restricted stock units cash paid expense share based compensation restricted stock units cash paid expense share based compensation restricted stock units cash paid expense Reinsurance and Policy Provisions [Abstract] Reinsurance and Policy Provisions [Abstract] Reinsurance Premiums for Insurance Companies, by Product Segment [Table] Reinsurance Premiums for Insurance Companies, by Product Segment [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Maximum [Member] Maximum [Member] Disaster [Axis] Catastrophic Event [Axis] Catastrophic Event [Domain] Catastrophic Event [Domain] Company sponsored agent trip [Member] Company sponsored agent trip [Member] Company sponsored agent trip - this maximum would apply to policies written on agents of the Company who are participating in Company-sponsored incentive trips. Home office [Member] Home office [Member] Home office - maximum occurrance limits apply to catastrophes involving the home office building. Products and Services [Axis] Products and Services [Axis] Reinsurance Premiums for Insurance Companies, by Product Segment [Domain] Products and Services [Domain] 100% Quota Share Accidental Death [Member] 100% Quota Share Accidental Death [Member] 100% Quota Share Accidental Death catastophy reinsurance agreement includes acts of terrorism and applies to agents on Company-sponsored trips[Member] Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] Reinsurance retention limit Reinsurance retention limit Reinsurance retention limit is the amount of risk the company accepts on any one life. Loss Contingency, Estimate of Possible Loss Loss Contingency, Estimate of Possible Loss Ceded Premiums Earned Ceded Premiums Earned Reinsurance Effect on Claims and Benefits Incurred, Amount Ceded Policyholder Benefits and Claims Incurred, Ceded Ceded reinsurance allowances for expenses and commissions Ceded reinsurance allowances for expenses and commissions Ceded reinsurance allowances for expenses and commissions Assumed Premiums Earned Assumed Premiums Earned Policyholder Benefits and Claims Incurred, Assumed Policyholder Benefits and Claims Incurred, Assumed Assumed reinsurance allowances for expenses and commissions Assumed reinsurance allowances for expenses and commissions Assumed reinsurance allowances for expenses and commissions Ceded Premiums, Life Insurance in Force Life Insurance in Force, Ceded Assumed Premiums, Life Insurance in Force Life Insurance in Force, Assumed Reinsurance effect on in force ceded, percentage Reinsurance effect on in force ceded, percentage Reinsurance effect on in force ceded, percentage Contracts in Force Subject to Participation Through Reinsurance, Percentage Contracts in Force Subject to Participation through Reinsurance, Ratio Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Reconciliation of Revenue from Segments to Consolidated [Table Text Block] Reconciliation of Revenue from Segments to Consolidated [Table Text Block] Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of Segment Reporting Information, by Segment [Table Text Block] Reconciliation of non-GAAP measures [table text block] [Table Text Block] Reconciliation of non-GAAP measures [table text block] [Table Text Block] Reconciliation of non-GAAP measures used to my management to evaluate segment performance to corresponding line items in our GAAP financial statements [Table Text Block] Concentration Risk Disclosure [Text Block] Schedules of Concentration of Risk, by Risk Factor [Table Text Block] Segment Reporting [Abstract] Reconciliation of Other Significant Reconciling Items from Segments to Consolidated [Table] Reconciliation of Other Significant Reconciling Items from Segments to Consolidated [Table] Adjustments for Error Corrections [Axis] Adjustments for Error Corrections [Axis] Adjustments for Error Correction [Domain] Adjustments for Error Correction [Domain] Correction of fees charged [Member] Correction of fees charged [Member] Correction of fees charged [Member] Policy charges [Axis] Policy charges [Axis] Policy charges - detail by type of charge [Axis] Policy Charges [Domain] Policy Charges [Domain] Policy Charges [Domain] Admin charges [Member] Admiin charges [Member] Admiin charges [Member] Cost of insurance charges [Member] Cost of insurance charges [Member] Cost of insurance charges [Member] Surrender charges [Member] Surrender charges [Member] Surrender charges [Member] Separate account charges [Member] Separate account charges [Member] Separate account charges [Member] Amortization of policy initiation fees [Member] Amortization of policy initiation fees [Member] Amortization of policy initiation fees for bonus premiums or bonus interest that was deferred upon policy initiation. [Member] Traditional life insurance premiums Life insurance - traditional [Member] Life insurance - traditional [Member] Life insurance - interest sensitive [Member] Life insurance - interest sensitive [Member] Life insurance - interest sensitive [Member] Segment Reporting, Other Significant Reconciling Item [Line Items] Segment Reporting, Other Significant Reconciling Item [Line Items] Proceeds from Insurance Premiums Collected Proceeds from Insurance Premiums Collected Increase (Decrease) in Premiums Receivable Increase (Decrease) in Premiums Receivable Traditional life insurance premiums Premiums Earned, Net, Life Interest sensitive product charges Insurance Commissions and Fees Defined Contribution Plan Grandfathered Choice Participant [Member] Defined Contribution Plan Grandfathered Choice Participant [Member] For the defined contribution plans, those participants who elected to retain the prior benefit provisions and forgo receipt of the additional matching contributions. These participants are referred to as "Grandfathered Choice Participants". Health and medical post retirement plans [Member] Postretirement Health Coverage [Member] Minimum [Member] Minimum [Member] Defined Contribution Plan, Employer Matching Contribution, Percent Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Defined contribution plan, employer discretionary percentage Defined contribution plan, employer discretionary percentage Defined contribution plan, employer discretionary percentage Defined Contribution Plan, Cost Defined Contribution Plan, Cost Defined Benefit Plan, Effect of Curtailments on Accumulated Benefit Obligation Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Portion at Other than Fair Value Measurement [Member] Portion at Other than Fair Value Measurement [Member] Mortgage loans Mortgage Loans on Real Estate, Commercial and Consumer, Net Policy loans Loans, Gross, Insurance Policy Future policy benefits Supplementary contracts without life contingencies Supplemental contracts without life contingencies, fair value disclosure Supplemental contracts without life contingencies, fair value disclosure Advance premiums and other deposits Advance premiums and other deposits, fair value disclosure Advance premiums and other deposits, fair value disclosure Long-term debt Long-term Debt, Fair Value Liabilities related to separate accounts Separate Accounts, Liability Accounting Changes and Error Corrections [Abstract] New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] Equity Award [Domain] Employee Stock Option [Member] Employee Stock Option [Member] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Earnings Per Share, Basic, Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Earnings Per Share, Basic, Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Earnings Per Share, Basic, Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Earnings Per Share, Diluted, Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Earnings Per Share, Diluted, Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Earnings Per Share, Diluted, Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Reclassification related to financial instruments recognition and measurement guidance Reclassification related to financial instruments recognition and measurement guidance Reclassification related to financial instruments recognition and measurement guidance Accounting Policies [Abstract] Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Property and Equipment, Net Property, Plant and Equipment, Net Accumulated Depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Depreciation expense Depreciation Goodwill Goodwill Impaired Mortgage Loans [Abstract] Impaired Mortgage Loans [Abstract] Schedule of Impaired Financing Receivable [Table] Schedule of Impaired Financing Receivable [Table] Class of Financing Receivable [Axis] Class of Financing Receivable, Type [Axis] Class of Financing Receivable [Domain] Class of Financing Receivable, Type [Domain] Financing Receivable, Impaired [Line Items] Financing Receivable, Impaired [Line Items] Impaired mortgage loans, Unpaid Principal Balance Impaired Financing Receivable, Unpaid Principal Balance Financing Receivable, Allowance for Credit Losses Financing Receivable, Allowance for Credit Losses Impaired mortgage loans, Related Allowance Impaired Financing Receivable, Related Allowance Mortgage Loans by Geographic Location [Abstract] Mortgage Loans by Geographic Location [Abstract] Mortgage Loans on Real Estate Schedule [Table] Mortgage Loans on Real Estate Schedule [Table] Real Estate, Type of Property [Axis] Real Estate, Type of Property [Axis] Real Estate [Domain] Real Estate [Domain] Office Office Building [Member] Retail Retail Site [Member] Industrial Industrial Property [Member] Other Other Property [Member] Investment Geographic Region [Axis] Investment Geographic Region [Axis] Investment Geographic Region [Domain] Investment Geographic Region [Domain] South Atlantic South Atlantic [Member] Represents the South Atlantic region of the United States. Pacific Pacific [Member] Represents the Pacific region of the United States. West North Central West North Central [Member] Represents the West North Central region of the United States. Mountain Mountain [Member] Represents the Mountain region of the United States. East North Central East North Central [Member] Represents the East North Central region of the United States. West South Central West South Central [Member] Represents the West South Central region of the United States. East South Central East South Central [Member] East South Central [Member] New England New England [Member] New England [Member] Middle Atlantic Middle Atlantic [Member] Middle Atlantic [Member] Loan-to-Value Ratio [Axis] Loan-to-Value Ratio [Axis] Loan-to-Value Ratio for mortgage loan credit quality [Axis] Total loan-to-value [Domain] Total loan-to-value [Domain] Total loan-to-value [Domain] 0% - 50% 0% to 50% loan to value [Member] 0% to 50% loan-to-value ratio [Member] 50% - 60% 51% to 60% loan-to-value [Member] 51% to 60% loan-to-value ratio [Member] 60% - 70% 61% to 70% loan-to-value [Member] 61% to 70% loan-to-value ratio [Member] 70% - 80% 71% to 80% loan-to-value [Member] 71% to 80% loan-to-value ratio [Member] 80% - 90% 81% to 90% loan to value [Member] 81% to 90% loan to value ratio [Member] MortgageLoans by Year of Origination [Axis] MortgageLoans by Year of Origination [Axis] MortgageLoans by Year of Origination [Axis] Mortgage Loans by Year of Origination [Domain] Mortgage Loans by Year of Origination [Domain] Mortgage Loans by Year of Origination [Domain] Year of origination 2017 [Member] Year of origination 2017 [Member] Year of origination 2017 [Member] Year of origination 2016 [Member] Year of origination 2016 [Member] Year of origination 2016 [Member] Year of origination 2015 [Member] Year of origination 2015 [Member] Year of origination 2015 Year of origination 2014 [Member] Year of origination 2014 [Member] Year of origination 2014 [Member] Year of origination 2013 [Member] Year of origination 2013 [Member] Year of origination 2013 [Member] Year of origination prior [Member] Year of origination prior [Member] Year of origination prior [Member] Mortgage Loans on Real Estate [Line Items] Mortgage Loans on Real Estate [Line Items] Other Commitment Other Commitment Carrying Value Mortgage Loans on Real Estate, Carrying Amount of Mortgages Percent of Total Percentage of Mortgage Loans Represents amount as a percentage of the total amortized cost of mortgage loans. Management and Other Agreements [Abstract] Management and Other Agreements [Abstract] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Farm Bureau Property & Casualty insurance company [Member] Farm Bureau Property & Casualty insurance company [Member] Farm Bureau Property & Casualty insurance company - management by us, but non consolidated as this company is in the form of a mutual insurance company. FB P&C is the lead company, but disclosures may also include other property & casualty subsdiaries and mutual holding companies to the extent expenses are allocated/shared between those companies. [Member] Subsidiary of Common Parent [Member] Subsidiary of Common Parent [Member] Majority Shareholder [Member] Majority Shareholder [Member] Other Farm Bureau organizations [Member] Other Farm Bureau organizations [Member] Other Farm Bureau organizations in various states in which we do business. There is no control, management or consolidation between these entities and us, but they control the use of the FB designation in states we do business and may have a minority ownership and/or board representation. [Member] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Management Fees Revenue Management Fees Revenue Professional and Contract Services Expense Professional and Contract Services Expense Equipment Expense Equipment Expense Royalty Expense Royalty Expense Royalty agreement restriction Royalty agreement restriction Royalty agreement restriction - represents the minimum quarterly common stock dividend at under which our majority shareholder has the option to terminate our royalty agreement. Net Unrealized Gains (Losses) on Investments in Accumulated Other Comprehensive Income [Abstract] Net Unrealized Gains (Losses) on Investments in Accumulated Other Comprehensive Income [Abstract] Net Unrealized Gains Losses [Table] Net Unrealized Gains Losses [Table] Net Unrealized Gains/Losses with offsets [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Accumulated net unrealized investment gain (loss) [Member] Accumulated net unrealized investment gain AND OTTI [Member] Accumulated net unrealized investment gain AND OTTI [Member] Net Unrealized Gains Losses [Line Items] Net Unrealized Gains Losses [Line Items] Net Unrealized Gains Losses on investments in accumulated other comprehensive income. Includes adjustmetns for assumed changes in amortization patterns and provision for taxes. [Line Items] Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax Assumed changes in amortization of DAC Assumed changes in amortization of DAC Adjustment for assumed changes in amortization of DAC on net unrealized appreciation/depreciation on investments Impact of net unrealized investment gains and losses Assumed changes in amortization patter of VIIF Adjustment for assumed changes in amortization of VIIF on net unrealized appreciation/depreciation on investments Assumed changes in amortization patter of URR Assumed changes in amortization patter of URR Adjustment for assumed changes in amortization of Unearned Revenue Reserves on net unrealized appreciation/depreciation on investments Assumed changes in policyholder liability Assumed changes in policyholder liability Assumed changes in policyholder liability Provision for deferred income taxes Provision Deferred Income Tax Benefits, Expense This item represents the applicable deferred income tax impacts of cumulative net unrealized gains/losses on fixed maturities available-for-sale, equity securities available-for-sale and derivative instruments net of adjustments related deferred policy acquisition costs, sales inducements, value of insurance inforce and unearned revenue reserves. Net Unrealized gains losses on investments in Accumulated other comprehensive Income Net Unrealized gains losses on investments in Accumulated other comprehensive Income Net Unrealized gains losses on investments in accumulated other comprehensive income. Stockholders' Equity Attributable to Parent [Abstract] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Other Comprehensive Income Location [Axis] Other Comprehensive Income Location [Axis] Other Comprehensive Income Location [Domain] Other Comprehensive Income Location [Domain] reclassifications out of accumulated other comprehensive income [Member] reclassifications out of accumulated other comprehensive income [Member] Reclassifications out of accumulated other comprehensive income [Member] Accumulated Net Unrealized Investment Gain (Loss) [Member] Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] Accumulated Other-than-Temporary Impairment [Member] Accumulated Other-than-Temporary Impairment Attributable to Parent [Member] Accumulated Defined Benefit Plans Adjustment [Member] Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] AOCI Attributable to Parent [Member] AOCI Attributable to Parent [Member] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments, Net of Tax Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments, Net of Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax Reclassification related to the Tax Act Reclassification related to the Tax Act Reclassification related to the Tax Act Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax Schedule IV. Reinsurance [Abstract] Schedule IV. Reinsurance [Abstract] Supplemental Schedule of Reinsurance Premiums for Insurance Companies [Text Block] Supplemental Schedule of Reinsurance Premiums for Insurance Companies [Text Block] Equity [Abstract] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Dividends [Axis] Dividends [Axis] Dividends [Domain] Dividends [Domain] Class of Stock [Line Items] Class of Stock [Line Items] Common Stock Special Dividends Per Share Cash Paid Common Stock Special Dividends Per Share Cash Paid Special cash dividends paid during the period for each share of common stock outstanding. Payment Of Special Cash Dividend Payment Of Special Cash Dividend Payment Of Special Cash Dividend Segment assets Segment assets Sum of assets attributable to segments, not including appreciation/depreciation in AOCI. Unrealized Gains on assets in AOCI Unrealized Gains on assets in AOCI Unrealized Gains on assets in AOCI not attributable to segments Assets Assets Operating Leases, Income Statement, Lease Revenue Depreciation and Amortization Operating Leases, Income Statement, Lease Revenue Depreciation and Amortization Operating Leases, Income Statement, Lease Revenue Depreciation and Amortization Statutory Accounting Practices [Table] Statutory Accounting Practices [Table] Subsidiaries [Member] Subsidiaries [Member] Statutory Accounting Practices [Line Items] Statutory Accounting Practices [Line Items] Statutory accounting practices, net gain from operations Statutory accounting practices, net gain from operations Statutory accounting practices, net gain from operations (excludes impact of realized gains and losses on investments) Statutory Accounting Practices, Statutory Net Income Amount Statutory Accounting Practices, Statutory Net Income Amount Statutory Accounting Practices, Statutory Capital and Surplus, Balance Statutory Accounting Practices, Statutory Capital and Surplus, Balance Dividend Payments Restrictions Schedule, Statutory Capital and Surplus Dividend Payments Restrictions Schedule, Statutory Capital and Surplus Statutory RBC Total adjusted capital Statutory RBC Total adjusted capital Statutory RBC Total adjusted capital Statutory Accounting Practices, Statutory Capital and Surplus Required Statutory Accounting Practices, Statutory Capital and Surplus Required Statutory RBC Ratio Statutory RBC Ratio Statutory RBC Ratio Statutory Accounting Practices, Statutory Amount Available for Dividend Payments Statutory Accounting Practices, Statutory Amount Available for Dividend Payments Equity Method Investments and Joint Ventures [Abstract] Schedule of Equity Method Investments [Table] Schedule of Equity Method Investments [Table] Investment, Name [Axis] Investment, Name [Axis] Investment, Name [Domain] Investment, Name [Domain] Affordable Housing Tax Credit Investments [Member] Affordable Housing Tax Credit Investments [Member] Affordable Housing Tax Credit Investments [Member] Limited Partnerships and Limited Liability Companies [Member] Limited Partnerships and Limited Liability Companies [Member] Limited Partnerships and Limited Liability Companies [Member] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Equity Method Investments Equity Method Investments Impairment losses on equity method investments Impairment losses on equity method investments Impairment losses on equity method investments Income (Loss) from Affordable Housing Projects, Equity Method Investments Income (Loss) from Affordable Housing Projects, Equity Method Investments Tax impact of Income from Equity Method Investments Tax impact of Income from Equity Method Investments Tax impact of Income from Equity Method Investments - This item represents the tax on the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. Investment Tax Credit Investment Tax Credit Income (Loss) from Equity Method Investments Other Commitment, Due in Next Twelve Months Other Commitment, Due in Next Twelve Months Other Commitment, Due in Second Year Other Commitment, Due in Second Year Other Commitment, Due in Third Year Other Commitment, Due in Third Year Qualified Affordable Housing Project Investments, Commitment Qualified Affordable Housing Project Investments, Commitment Reinsurance [Text Block] Reinsurance [Text Block] Present Value of Future Insurance Profits [Text Block] Present Value of Future Insurance Profits [Text Block] Schedule of Minimum Guaranteed Benefit Liabilities [Table Text Block] Schedule of Minimum Guaranteed Benefit Liabilities [Table Text Block] Available-for-sale Securities [Abstract] Other Debt Obligations [Member] Other Debt Obligations [Member] Redeemable Preferred Stock [Member] Redeemable Preferred Stock [Member] Amortized Cost Available-for-sale Securities, Amortized Cost Basis Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax Fair Value Non-credit losses on other-than-temporary impairments (1) Other than Temporary Impairment Losses, Investments Portion in Other Comprehensive Income, Before Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities The amount of other than temporary impairment loss on an available-for-sale debt security related to factors other than credit losses when the entity does not intend to sell the security and it is not more likely than not that the entity will be required to sell the security before recovery of its amortized cost basis. This amount, which includes the portion attributable to the noncontrolling interest, if any, is a portion of the deduction from the total impairment losses of investments (before taxes) presented on the income statement; this amount is also referred to as the amount incurred by the reporting entity or the consolidated entity. Income Tax Contingency [Table] Income Tax Contingency [Table] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] Income Tax Contingency [Line Items] Income Tax Contingency [Line Items] Income Tax Expense (Benefit), Continuing Operations [Abstract] Income Tax Expense (Benefit), Continuing Operations [Abstract] Current Federal Tax Expense (Benefit) Current Federal Tax Expense (Benefit) Deferred Federal Income Tax Expense (Benefit) Deferred Federal Income Tax Expense (Benefit) Income Tax Expense (Benefit) Income Tax Expense (Benefit) Income Tax Effects Allocated Directly to Equity [Abstract] Income Tax Effects Allocated Directly to Equity [Abstract] Change in net unrealized investment gains/losses - deferred, Tax Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax Issuance of shares under stock option plan, current Income tax effects allocated to equity, employee stock options, current Income tax effects allocated to equity, employee stock options, current tax Income Tax Effects Allocated Directly to Equity Income Tax Effects Allocated Directly to Equity Total tax from all sources provided in our financial statements Total tax from all sources provided in our financial statements Total tax from all sources provided in our financial statements Fair Value [Abstract] Fair Value [Abstract] Fair Value Disclosures [Text Block] Fair Value Disclosures [Text Block] Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] Net realized capital gains on sales of investments Gain (Loss) on Investments, Excluding Other than Temporary Impairments Change in offsets to unrealized on investments Change in offsets to unrealized on investments Change in offsets to unrealized on investments, includes changes in amortization pattern of DAC, VIIF & URR and provision for deferred income tax. Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, before Tax Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, before Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Tax Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax Other Comprehensive Income (Loss), Available-for-sale Securities, Tax Other Comprehensive Income (Loss), Available-for-sale Securities, Tax Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Income Tax Disclosure [Abstract] Deferred Tax Assets, Gross [Abstract] Deferred Tax Assets, Gross [Abstract] Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Policyholder Liabilities Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Policyholder Liabilities Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits Deferred Tax Assets, Operating Loss Carryforwards Deferred Tax Assets, Operating Loss Carryforwards Deferred Tax Assets, Other Deferred Tax Assets, Other Deferred Tax Assets, Gross Deferred Tax Assets, Gross Deferred Tax Liabilities, Gross [Abstract] Deferred Tax Liabilities, Gross [Abstract] Deferred Tax Liabilities, Other Comprehensive Income Deferred Tax Liabilities, Other Comprehensive Income Deferred Tax Liabilities, Deferred Expense, Deferred Policy Acquisition Cost Deferred Tax Liabilities, Deferred Expense, Deferred Policy Acquisition Cost Deferred Tax Liabilities, Value of Insurance in Force Acquired Deferred Tax Liabilities, Value of Insurance in Force Acquired Deferred Tax Liabilities, Value of Insurance in Force Acquired [Member] Deferred Tax Liabilities, Property, Plant and Equipment Deferred Tax Liabilities, Property, Plant and Equipment Deferred Tax Liabilities, Other Deferred Tax Liabilities, Other Deferred Tax Liabilities, Gross Deferred Tax Liabilities, Gross Deferred income taxes Deferred Tax Liabilities, Net Operating Loss Carryforwards Operating Loss Carryforwards Credit loss component of other-than-temporary impairments on fixed maturity securities [Abstract] Credit loss component of other-than-temporary impairments on fixed maturity securities [Abstract] Schedule of Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table] Schedule of Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table] Debt Security Category [Axis] Debt Security Category [Axis] Other than Temporary Impairment, Credit Losses Recognized in Earnings, Categories of Investments [Domain] Other than Temporary Impairment, Credit Losses Recognized in Earnings, Categories of Investments [Domain] Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] Balance at beginning of period Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held Increases for newly impaired investments Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment Increases to previously impaired investments Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses Reductions due to investments sold Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold Reduction for credit loss that no longer has a portion of the OTTI loss recognized in other comprehensive income Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Change in Status Balance at end of period Realized gains losses on investments [Abstract] Realized gains losses on investments [Abstract] Schedule of Gain (Loss) on Investments [Table] Schedule of Gain (Loss) on Investments [Table] Impairments by type [Axis] Impairments by type [Axis] Impairments by type [Axis] Total impairments on investments [Domain] Total impairments on investments [Domain] Total impairments on investments [Domain] Credit-related portion of fixed maturity losses (1) Credit related portion of fixed maturity losses [Member] Amount represents the credit-related losses recognized for fixed maturities which were not written down to fair value. As discussed above the non-credit portion of the losses have been recognized in other comprehensive income. Other credit-related (2) Other credit related impairments [Member] Amount represents credit-related losses for mortgage loans, real estate and fixed maturities written down to fair value. Investments by Category [Axis] Investments by Category [Axis] Gain (Loss) on Investments, Including Marketable Securities and Investments Held at Cost, Categories of Investments [Domain] Marketable Securities and Investments Held at Cost [Domain] Categories of Investments, Marketable Securities, Available-for-sale Securities [Member] Categories of Investments, Cost-method Investments [Member] Cost-method Investments [Member] Gain (Loss) on Investments [Line Items] Gain (Loss) on Investments [Line Items] Gross gains Available-for-sale Securities, Gross Realized Gains Gross losses Available-for-sale Securities, Gross Realized Losses Equity securities Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments Mortgage loans Gain (Loss) on Sales of Loans, Net Real estate Gains (Losses) on Sales of Other Real Estate Other Gain (Loss) on Disposition of Other Financial Assets Gain (Loss) on Investments, Excluding Other than Temporary Impairments Realized gains (losses) on investments recorded in income Gain (Loss) on Investments Proceeds from Sale of Available-for-sale Securities, Debt Proceeds from Sale of Available-for-sale Securities, Debt Accident and health premiums Accident and Health Insurance Product Line [Member] Direct Premiums, Life Insurance in Force Life Insurance in Force, Gross Premiums, Net, Life Insurance in Force Life Insurance in Force, Net Life Insurance in Force Premiums, Percentage Assumed to Net Life Insurance in Force, Percentage Assumed to Net Direct Premiums Earned Direct Premiums Earned Premiums Earned, Net Premiums Earned, Net Premiums, Percentage Assumed to Net Premiums, Percentage Assumed to Net Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Net income attributable to FBL Financial Group, Inc. Net Income (Loss) Attributable to Parent Dividends on preferred stock Dividends, Preferred Stock, Cash Income available to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Weighted Average Number of Shares Outstanding, Basic Weighted Average Number of Shares Outstanding, Basic Weighted Average Number Diluted Shares Outstanding Adjustment Weighted Average Number Diluted Shares Outstanding Adjustment Weighted Average Number of Shares Outstanding, Diluted Weighted Average Number of Shares Outstanding, Diluted Earnings per common share Earnings Per Share, Basic Earnings per common share - assuming dilution Earnings Per Share, Diluted Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Capital trust equity [Member] Capital trust equity [Member] Capital trust equity in FBL Financial Group Capital Trust, which holds our 5% Subordinated Deferrable Interest Notes, due June 30, 2047. We have contractual right of offset, so the equity is offset against the notes on our consolidated balance sheet. [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Senior Notes, unaffiliated [Member] Senior Notes, unaffiliated [Member] Unaffiliated Bond that takes priority over other debt securities sold by the issuer. In the event the issuer goes bankrupt, senior debt holders receive priority for (must receive) repayment prior to (relative to) junior and unsecured (general) creditors.[Member] 5% Subordinated Deferrable Interest Notes, due June 30, 2047 [Member] 5% Subordinated Deferrable Interest Notes, due June 30, 2047 [Member] 5% Subordinated Deferrable Interest Notes, due June 30, 2047 [Member] Trust Preferred Securities Subject to Mandatory Redemption [Member] Trust Preferred Securities Subject to Mandatory Redemption [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] Long-term debt payable to non-affiliates Long-term Debt Preferred Stock, Liquidation Preference Per Share Trust preferred securities liquidation value per share Trust preferred securities liquidation value per share Preferred stock, shares outstanding Trust preferred securities number of shares Trust preferred securities number of shares Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Defined Benefit Plan, Benefit Obligation, Benefits Paid Defined Benefit Plan, Benefit Obligation, Benefits Paid Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) Defined Benefit Plan, Plan Assets, Contributions by Employer Defined Benefit Plan, Plan Assets, Contributions by Employer Defined Benefit Plan, Plan Assets, Benefits Paid Defined Benefit Plan, Plan Assets, Benefits Paid Defined Benefit Plan, Funded (Unfunded) Status of Plan Defined Benefit Plan, Funded (Unfunded) Status of Plan Defined Benefit Plan, Accumulated Benefit Obligation Defined Benefit Plan, Accumulated Benefit Obligation Stockholders' Equity Note [Abstract] Preferred Stock, Liquidation Preference Per Share Preferred Stock, Liquidation Preference Per Share Preferred Stock, Dividend Rate, Percentage Preferred Stock, Dividend Rate, Per-Dollar-Amount Preferred Stock, Redemption Price Per Share Preferred Stock, Redemption Price Per Share Common stock, without par value Common Stock, Value, Outstanding Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Issuance of common stock under compensation plans Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures Shares of common stock repurchased Stock Repurchased During Period, Shares Purchase of common stock Stock Repurchased During Period, Value Board of directors members Board of directors members Board of directors - number of members Sale of Stock, Percentage of Ownership after Transaction Sale of Stock, Percentage of Ownership after Transaction Purchase of shares of common stock Payments for Repurchase of Common Stock Stock Repurchase Program, Remaining Authorized Repurchase Amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Reinsurance and Policy Provisions [Text Block] Reinsurance and Policy Provisions [Text Block] Reinsurance and Policy Provisions [Text Block] Other income and other expense [Table] Other income and other expense [Table] Other income and other expense [Table] Products and Services [Domain] Interest Sensitive Life [Member] Interest Sensitive Life [Member] Participating Life Insurance Policy [Member] Participating Life Insurance Policy [Member] Other income and other expense [Line Items] Other income and other expense [Line Items] [Line Items] for Other income and other expense [Table] Future policy benefits: Liability for Future Policy Benefits [Abstract] Future Policy Benefits, Interest Rate Assumptions Liability for Future Policy Benefit by Product Segment, Interest Rate, Year of Issue Future policy benefits, assumptions, average rate in investment yields in gross margin estimation Future policy benefits, assumptions, average rate in investment yields in gross margin estimation Future policy benefits, assumptions, average rate in investment yields in gross margin estimation Other Policyholder Claims and Benefits Policyholder Benefits and Claims Incurred, Net [Abstract] Premiums from policies subject to participation in dividends Premiums from policies subject to participation in dividends Premiums from policies subject to participation in dividends Contracts in force subject to participation in dividends Contracts in force subject to participation in dividends Contracts in force subject to participation in dividends Other Income and Expenses [Abstract] Other Income and Expenses [Abstract] Real Estate Owned, Valuation Allowance Real Estate Owned, Valuation Allowance Lease income Operating Leases, Income Statement, Lease Revenue Investment Advisory Fees Investment Advisory Fees Nonoperating Income (Expense) Nonoperating Income (Expense) Quarterly Financial Information [Abstract] Quarterly Financial Information [Abstract] Premiums and product charges Premiums and product charges Insurance premiums net of reinsurance on traditional life products and product charges earned on interest sensitive products Net investment income Net Investment Income Realized gains (losses) on investments Realized Investment Gains (Losses) Revenues Revenues Segment Reporting Disclosure [Text Block] Segment Reporting Disclosure [Text Block] Stockholders' Equity Note Disclosure [Text Block] Stockholders' Equity Note Disclosure [Text Block] Reconciliation of Revenue from Segments to Consolidated [Table] Reconciliation of Revenue from Segments to Consolidated [Table] Segment Reporting, Revenue Reconciling Item [Line Items] Segment Reporting, Revenue Reconciling Item [Line Items] Pre-Tax Operating Income (Loss) Pre-Tax Operating Income (Loss) Pre-Tax Operating Income (Loss) Income tax on operating income Income tax on operating income Income tax on operating income Operating Income (Loss) Operating Income (Loss) Operating revenues Operating revenues Operating revenues, not net of expenses. Realized gains on investments related to revenue Realized gains on investments related to revenue Realized gains on investments, including only the offset for unearned revenue reserve as other offsets do not impact revenue. Derivative unrealized related to revenues Derivative unrealized related to revenues Derivative change in net unrealized related to revenues. Adjustment between Net income and Operating income. Includes only items included in revenues. Investment Income, Net Investment Income, Net Change in net unrealized gains/losses on derivatives Change in net unrealized gains/losses on derivatives Change in net unrealized gains/losses on derivatives Other Depreciation and Amortization Other Depreciation and Amortization Deferred Policy Acquisition Cost, Unrealized Investment Gain (Loss) Depreciation, Depletion and Amortization Depreciation, Depletion and Amortization Recognition of underwriting, acquisition and insurance costs [Table] Recognition of underwriting, acquisition and insurance costs [Table] Recognition of underwriting, acquisition and insurance costs [Table] Recognition of underwriting, acquisition and insurance costs [Line Items] Recognition of underwriting, acquisition and insurance costs [Line Items] [Line Items] for Recognition of underwriting, acquisition and insurance costs [Table] Commission expense, net of deferrals Insurance Commissions Amortization of deferred acquisition costs Deferred Policy Acquisition Costs, Amortization Expense Amortization of value of insurance in force acquired Present Value of Future Insurance Profits, Period Increase (Decrease) Other underwriting, acquisition and insurance expenses, net of deferrals Other Underwriting Expense Total Selling, General and Administrative Expense Alternative investments [Member] Alternative investments [Member] Alternative investments [Member] Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase Defined Benefit Plan, Target Allocation Percentage Defined Benefit Plan, Target Allocation Percentage Defined Benefit Plan, Actual Plan Asset Allocations Defined Benefit Plan, Actual Plan Asset Allocations Summary of Investments [Abstract] Summary of Investments [Abstract] Summary of Investments, Other than Investments in Related Parties [Text Block] Summary of Investments, Other than Investments in Related Parties [Text Block] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies Disclosure [Text Block] Consolidated Statements of Comprehensive Income [Abstract] Consolidated Statements of Comprehensive Income [Abstract] Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Other Comprehensive Income (Loss), Net of Tax [Abstract] Other Comprehensive Income (Loss), Net of Tax [Abstract] Change in net unrealized investment gains/losses Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Non-credit impairment losses Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Net of Tax, Including Portion Attributable to Noncontrolling Interest Change in funded status of the other postretirement benefit plans Total other comprehensive income, net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Total comprehensive income, net of tax Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive income (loss) attributable to noncontrolling interest Net Income (Loss) Attributable to Noncontrolling Interest Comprehensive income attributable to FBL Financial Group, Inc. Comprehensive Income (Loss), Net of Tax, Attributable to Parent Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Share-based Compensation, Stock Options, Activity [Table Text Block] Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] Schedule of Stock by Class [Table Text Block] Schedule of Stock by Class [Table Text Block] Comprehensive Income (Loss) [Table Text Block] Comprehensive Income (Loss) [Table Text Block] Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Schedule of Multiemployer Plans [Table Text Block] Schedule of Multiemployer Plans [Table Text Block] Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block] Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block] Schedule of Net Benefit Costs [Table Text Block] Schedule of Net Benefit Costs [Table Text Block] Schedule of Defined Benefit Plans Disclosures [Table Text Block] Schedule of Defined Benefit Plans Disclosures [Table Text Block] Schedule of Assumptions Used [Table Text Block] Schedule of Assumptions Used [Table Text Block] Schedule of Allocation of Plan Assets [Table Text Block] Schedule of Allocation of Plan Assets [Table Text Block] Schedule of Level Three Defined Benefit Plan Assets Roll Forward [Table Text Block] Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block] Compensation and Employee Benefit Plans [Text Block] Compensation and Employee Benefit Plans [Text Block] Postemployment Benefits Disclosure [Text Block] Postemployment Benefits Disclosure [Text Block] Compensation and Employee Benefit Plans [Text Block] Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Change in Unrealized Appreciation Depreciation of Investments [Abstract] Change in Unrealized Appreciation Depreciation of Investments [Abstract] Change in unrealized appreciation/depreciation of investments Unrealized Gain (Loss) on Investments Schedule II. Condensed Financial Information of Registrant [Abstract] Schedule II. Condensed Financial Information of Registrant [Abstract] Condensed Financial Information of Parent Company Only Disclosure [Text Block] Condensed Financial Information of Parent Company Only Disclosure [Text Block] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Carrying (Reported) Amount, Fair Value Disclosure [Member] Reported Value Measurement [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fixed maturities - available for sale Available-for-sale Securities, Debt Securities Equity securities - available for sale Available-for-sale Securities, Equity Securities Initial impact on deferred tax liabilities from the Tax Act Initial impact on deferred tax liabilities from the Tax Act Initial impact on deferred tax liabilities from the Tax Act Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Effective Income Tax Rate Reconciliation, Tax Exempt Income Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount Effective Income Tax Rate Reconciliation, Other Adjustments Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Other [Abstract] Other [Abstract] Summary of Investment Holdings [Table] Summary of Investment Holdings [Table] Summary of Investment Holdings [Line Items] Summary of Investment Holdings [Line Items] Deposit Assets Deposit Assets Available-for-sale Securities Pledged as Collateral Available-for-sale Securities Pledged as Collateral Investment, Non-Income Producing Flag Investment, non-income producing Carrying value of Investments which have been non-income producing for the past 12 months Components of Net Investment Income [Abstract] Components of Net Investment Income [Abstract] Schedule of Investment Income, Reported Amounts, by Category [Table] Investment Income [Table] Investment Type [Axis] Investment Type [Axis] Investments [Domain] Investments [Domain] Fixed maturities - available for sale Fixed Maturities [Member] Equity securities - available for sale Mortgage loans Mortgages [Member] Real estate Real Estate [Member] Policy loans Policy Loans [Member] Short-term investments, cash and cash equivalents Short-term Investments [Member] Schedule of Investment Income, Reported Amounts, by Category [Line Items] Net Investment Income [Line Items] Gross Investment Income, Operating Gross Investment Income, Operating Derivative income (loss) Gain (Loss) on Derivative Instruments, Net, Pretax Prepayment fee income and other Net Investment Income, insurance entity, prepayment fee income and other Net Investment Income, insurance entity, prepayment fee income and other Less investment expenses Investment Income, Investment Expense Net investment income Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table] Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] Operating Income offsets due to Interest Sensitive Product Reserves Operating Income offsets due to Interest Sensitive Product Reserves Operating Income offsets due to Interest Sensitive Product Reserves Realized gains losses on investments net of offsets Realized gains losses on investments net of offsets Realized gains losses on investments net of offsets, not included in operating income as they can fluctuate greatly from quarter to quarter. Derivatives unrealized gain net of offsets Derivatives unrealized gain net of offsets Derivatives change in net unrealized gain net of offsets, reconciling item from net income to operating income due to fluctuations from quarter to quarter. Statement of Financial Position [Abstract] Preferred Stock [Member] Preferred Stock [Member] Assets [Abstract] Assets [Abstract] Investments: Fixed maturities - available for sale, at fair value (amortized cost: 2017 - $6,757,250; 2016 - $6,661,711) Equity securities - available for sale, at fair value (cost: 2017 - $123,320; 2016 - $130,479) Real estate Real Estate Investments, Net Short-term investments Short-term Investments Other investments Other Investments Total investments Investments Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value