Fair Value Disclosures [Abstract] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Recurring Fair Value, Measurements, Recurring [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Level 1 Fair Value, Inputs, Level 1 [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Level 3 Fair Value, Inputs, Level 3 [Member] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] U.S. Treasury US Treasury Securities [Member] U.S. government agency US Government Agencies Debt Securities [Member] States, municipalities and political subdivisions US States and Political Subdivisions Debt Securities [Member] Foreign bonds Foreign Government Debt Securities [Member] Public utilities Public Utility, Bonds [Member] Corporate bonds Corporate Debt Securities [Member] Mortgage-backed securities Collateralized Mortgage Backed Securities [Member] Government national mortgage association Government National Mortgage Association Certificates and Obligations (GNMA) [Member] Federal home loan mortgage corporation Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member] Federal national mortgage association Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] Asset-backed securities Asset-backed Securities [Member] Fixed Maturities Debt Securities [Member] Common stocks Common Stock [Member] Nonredeemable preferred stocks Nonredeemable Preferred Stock [Member] Equity securities: Equity Securities [Member] Redeemable preferred stocks Redeemable Preferred Stock [Member] Investment Sector [Axis] Investment Sector [Axis] Investment Sector [Domain] Investment Sector [Domain] General obligations: General Obligations [Member] General Obligations [Member] Special revenue: Special Revenue [Member] Special Revenue [Member] Public utilities Public Utilities [Member] Public Utilities [Member] Energy Energy [Member] Energy [Member] Industrials Industrial [Member] Industrial [Member] Consumer goods and services Consumer Goods and Service [Member] Consumer Goods and Service [Member] Health care Health Care [Member] Health Care [Member] Technology, media and telecommunications Technology, Media and Telecommunications [Member] Technology, Media and Telecommunications [Member] Financial services Financial Services [Member] Financial Services [Member] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] Midwest Midwest [Member] Midwest [Member] Northeast Northeast [Member] Northeast [Member] South South [Member] South [Member] West West [Member] West [Member] Operating Activities [Axis] Operating Activities [Axis] Operating Activities [Domain] Operating Activities [Domain] Discontinued Operations Discontinued Operations [Member] Continuing and Discontinuing Operations Continuing and Discontinuing Operations [Member] Continuing and Discontinuing Operations [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, debt securities Available-for-sale Securities, Debt Securities Available-for-sale, equity securities Available-for-sale Securities, Equity Securities Available-for-sale securities, fair value Available-for-sale Securities Trading securities Trading Securities Equity securities Equity Securities, FV-NI Equity Securities, FV-NI Short-Term Investments Short-term Investments, Fair Value Disclosure Short-term Investments, Fair Value Disclosure Money Market Accounts Cash and Cash Equivalents, Fair Value Disclosure Corporate-Owned Life Insurance Cash Surrender Value, Fair Value Disclosure Total Assets Measured at Fair Value Assets, Fair Value Disclosure Statement of Cash Flows [Abstract] Cash Flows From Operating Activities Net Cash Provided by (Used in) Operating Activities [Abstract] Net income Net Income (Loss) Attributable to Parent Less net income (loss) from discontinued operations, net of taxes Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Adjustments to reconcile net income to net cash provided by operating activities Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Net accretion of bond premium Accretion (Amortization) of Discounts and Premiums, Investments Depreciation and amortization Depreciation, Depletion and Amortization Stock-based compensation expense Share-based Compensation Net realized investment (gains) losses Realized Investment Gains (Losses) Net cash flows from trading investments Proceeds from (Payments for) Trading Securities, Short-term Deferred income tax benefit Deferred Income Tax Expense (Benefit) Changes in: Increase (Decrease) in Operating Capital [Abstract] Accrued investment income Increase (Decrease) in Accrued Investment Income Receivable Premiums receivable Increase (Decrease) in Premiums Receivable Deferred policy acquisition costs Increase Decrease in Deferred Policy Acquisition Cost and Value of Business Acquired Increase (Decrease) in Deferred Policy Acquisition Cost and Value of Business Acquired Reinsurance receivables Increase (Decrease) in Reinsurance Recoverable Prepaid reinsurance premiums Increase (Decrease) in Prepaid Reinsurance Premiums Income taxes receivable Increase (Decrease) in Income Taxes Receivable Other assets Increase (Decrease) in Other Operating Assets Losses and loss settlement expenses Increase (Decrease) in Future Policy Benefit Reserves Unearned premiums Increase (Decrease) in Unearned Premiums Accrued expenses and other liabilities Increase (Decrease) In Accrued Expenses And Other Liabilities Increase (Decrease) in Accrued expenses and other liabilities. Income taxes payable Increase (Decrease) in Income Taxes Payable Deferred income taxes Increase (Decrease) in Deferred Income Taxes Other, net Increase (Decrease) in Other Operating Liabilities Cash from operating activities - continuing operations Net Cash Provided by (Used in) Operating Activities, Continuing Operations Cash from operating activities - discontinued operations Cash Provided by (Used in) Operating Activities, Discontinued Operations Cash from operating activities - gain on sale of discontinued operations Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax Total adjustments Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash Flows From Investing Activities Net Cash Provided by (Used in) Investing Activities [Abstract] Proceeds from sale of available-for-sale investments Proceeds from Sale of Available-for-sale Securities Proceeds from call and maturity of available-for-sale investments Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities Proceeds from short-term and other investments Proceeds from Sale, Maturity and Collection of Short-term Investments Proceeds from the sale of discontinued operations Proceeds from Divestiture of Businesses Purchase of available-for-sale investments Payments to Acquire Available-for-sale Securities Purchase of short-term and other investments Payments to Acquire Short term and Other Investments Payments to Acquire Short-term and Other Investments. Net purchases and sales of property and equipment Payments for (Proceeds from) Productive Assets Cash from investing activities - continuing operations Net Cash Provided by (Used in) Investing Activities, Continuing Operations Cash from investing activities - discontinued operations Cash Provided by (Used in) Investing Activities, Discontinued Operations Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities Cash Flows From Financing Activities Net Cash Provided by (Used in) Financing Activities [Abstract] Payment of cash dividends Payments of Dividends Repurchase of common stock Payments for Repurchase of Common Stock Issuance of common stock Proceeds from Issuance of Common Stock Cash from financing activities - continuing operations Net Cash Provided by (Used in) Financing Activities, Continuing Operations Cash from financing activities - discontinued operations Cash Provided by (Used in) Financing Activities, Discontinued Operations Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Net Change in Cash and Cash Equivalents Cash and Cash Equivalents, Period Increase (Decrease) Less: increase in cash and cash equivalents - discontinued operations Net Cash Provided by (Used in) Discontinued Operations Net increase (decrease) in cash and cash equivalents - continuing operations Net Cash Provided by (Used in) Continuing Operations Cash and Cash Equivalents at Beginning of Period - Continuing Operations Cash and Cash Equivalents, at Carrying Value Cash and Cash Equivalents at End of Period - Continuing Operations Share-based Compensation [Abstract] 2018 Future Share-based Compensation Expense, Remainder of Current Year Future Share-based Compensation Expense, Remainder of Current Year 2019 Future Share-based Compensation Expense, Year One Future Share-based Compensation Expense, Year One 2020 Future Share-based Compensation Expense, Year Two Future Share-based Compensation Expense, Year Two 2021 Future Share-based Compensation Expense, Year Three Future Share-based Compensation Expense, Year Three 2022 Future Share-based Compensation Expense, Year Four Future Share-based Compensation Expense, Year Four Total Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Carrying Value and Estimated Fair Value of Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Financial Instruments Measured at Fair Value on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Changes in Fair Value of Level 3 Securities Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Equity [Abstract] Schedule of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Discontinued Operations and Disposal Groups [Abstract] Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Disposal Group Name [Axis] Disposal Group Name [Axis] Disposal Group Name [Domain] Disposal Group Name [Domain] United Life United Life Insurance Company [Member] United Life Insurance Company [Member] Disposal Group Classification [Axis] Disposal Group Classification [Axis] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Discontinued Operations, Disposed of by Sale Discontinued Operations, Disposed of by Sale [Member] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Disposal group, cash consideration Disposal Group, Including Discontinued Operation, Consideration Disposal group, adjustment to consideration Disposal Group, Including Discontinued Operation, Adjustment To Consideration Disposal Group, Including Discontinued Operation, Adjustment To Consideration Proceeds from disposal of subsidiary Proceeds From Divestiture Of Businesses, Gross Proceeds From Divestiture Of Businesses, Gross Gain on sale of discontinued operations, net of taxes Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax Transition services agreement duration Disposal Group, Including Discontinued Operation, Transition Services Agreement Duration Disposal Group, Including Discontinued Operation, Transition Services Agreement Duration Organization, Consolidation and Presentation of Financial Statements [Abstract] Discontinued Operations Discontinued Operations, Policy [Policy Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Reclassification Reclassification, Policy [Policy Text Block] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Deferred Policy Acquisition Costs (DAC) Deferred Policy Acquisition Costs, Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Subsequent Events Subsequent Events, Policy [Policy Text Block] Recently Issued Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Fair Value Measurement Fair Value Measurement, Policy [Policy Text Block] Segment Information Segment Reporting, Policy [Policy Text Block] Earnings Per Share Earnings Per Share, Policy [Policy Text Block] Components of Deferred Acquisition Costs Schedule of Deferred Policy Acquisition Costs [Table Text Block] Schedule of Deferred Policy Acquisition Costs [Table Text Block] Statement of Financial Position [Abstract] ASSETS Assets [Abstract] Investments Investments [Abstract] Fixed maturities Marketable Securities, Fixed Maturities [Abstract] Held-to-maturity, at amortized cost (fair value $150 in 2018 and $150 in 2017) Held-to-maturity Securities Available-for-sale, at fair value (amortized cost $1,577,448 in 2018 and $1,516,610 in 2017) Trading securities, at fair value (amortized cost $13,229 in 2018 and $14,582 in 2017) Trading Securities, Debt Equity securities at fair value (cost $65,481 in 2018 and $63,275 in 2017) Other long-term investments Other Long-term Investments Short-term investments Other Short-term Investments Total investments Investments Cash and cash equivalents Accrued investment income Accrued Investment Income Receivable Premiums receivable (net of allowance for doubtful accounts of $1,082 in 2018 and $1,255 in 2017) Premiums Receivable, Net Deferred policy acquisition costs Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Net Property and equipment (primarily land and buildings, at cost, less accumulated depreciation of $52,693 in 2018 and $51,988 in 2017) Property, Plant and Equipment, Net Reinsurance receivables and recoverables Reinsurance Recoverables, Including Reinsurance Premium Paid Prepaid reinsurance premiums Prepaid Reinsurance Premiums Income taxes receivable Income Taxes Receivable Goodwill and intangible assets Goodwill and intangible assets Goodwill and intangible assets Other assets Other Assets Assets held for sale Disposal Group, Including Discontinued Operation, Assets TOTAL ASSETS Assets LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities and Equity [Abstract] Liabilities Liabilities [Abstract] Losses and loss settlement expenses Liability for Claims and Claims Adjustment Expense, Property Casualty Liability Unearned premiums Unearned Premiums Accrued expenses and other liabilities Accrued expenses and other liabilities Accrued expenses and other liabilities. Income taxes payable Taxes Payable Deferred income taxes Deferred Tax Liabilities, Gross Liabilities held for sale Disposal Group, Including Discontinued Operation, Liabilities TOTAL LIABILITIES Liabilities Stockholders’ Equity Stockholders' Equity Attributable to Parent [Abstract] Common stock, $0.001 par value; authorized 75,000,000 shares; 24,912,748 and 24,916,806 shares issued and outstanding in 2018 and 2017, respectively Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital, Common Stock Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive income, net of tax Accumulated Other Comprehensive Income (Loss), Net of Tax TOTAL STOCKHOLDERS’ EQUITY Stockholders' Equity Attributable to Parent TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities and Equity Insurance Loss Reserves [Abstract] Reserves for Losses and Loss Settlement Expenses Liability for Future Policy Benefits and Unpaid Claims Disclosure [Text Block] Income Statement [Abstract] Reclassifications for net unrealized gains on available-for-sale securities Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Reclassification adjustment for employee benefit costs included in expense Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax Reclassifications adjustments - tax Reclassification from AOCI, Current Period, Tax Statement of Stockholders' Equity [Abstract] Shares repurchased (in shares) Stock Repurchased During Period, Shares Shares issued for stock-based awards (in shares) Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Dividends on common stock, per share (in dollars per share) Common Stock, Dividends, Per Share, Declared Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Type of Deferred Compensation [Axis] Equity-Based Arrangements, Individual Contracts, Type of Deferred Compensation [Axis] Type of Deferred Compensation, All Types [Domain] Equity-Based Arrangements, Individual Contracts, Type of Deferred Compensation [Domain] Rabbi Trust Rabbi Trust [Member] Rabbi Trust [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Other Assets Other Assets [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Cash surrender value Retirement Benefits [Abstract] Net Periodic Benefit Cost Schedule of Net Benefit Costs [Table Text Block] Statement [Table] Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common stock Additional paid-in capital Additional Paid-in Capital [Member] Retained earnings Retained Earnings [Member] Accumulated other comprehensive income (loss), net of tax AOCI Attributable to Parent [Member] Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance, beginning of year Shares repurchased Stock Repurchased During Period, Value Shares issued for stock-based awards Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures Compensation expense and related tax benefit for stock-based award grants Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Cumulative effect of change in accounting principle Cumulative Effect of New Accounting Principle in Period of Adoption Dividends on common stock ($0.28 per share) Dividends, Common Stock Change in net unrealized investment appreciation and depreciation of discontinued operations, sold Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Change in liability for underfunded employee benefit plans Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent All other changes in stockholders’ equity accounts Changes In Stockholders Equity Accounts Excluding Net Income Loss Total changes in stockholders' equity accounts excluding net income loss. Balance, end of period Discontinued Operations Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Employee Benefits Pension and Other Postretirement Benefits Disclosure [Text Block] 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] Pension Plan Pension Plan [Member] Postretirement Benefit Plan Other Postretirement Benefits Plan [Member] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Net periodic benefit cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] Service cost Defined Benefit Plan, Service Cost Interest cost Defined Benefit Plan, Interest Cost Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Amortization of prior service credit Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Amortization of net loss Defined Benefit Plan, Amortization of Gain (Loss) Net periodic benefit cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Estimated 2018 pension plan contribution, disclosed in prior year 10K Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year Contribution by employer Defined Benefit Plan, Plan Assets, Contributions by Employer Activity in Stock Award Plans Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] Remaining Stock-Based Compensation Expense Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Employee Stock Award Plan-2008 Employee Stock Award Plan-2008 [Member] Employee Stock Award Plan (the "2008 Stock Plan") [Member] Director Plan - 2005 Director Plan - 2005 [Member] the 2005 Non-qualified Non-employee Director Stock Option and Restricted Stock Plan (the "Director Plan" [Member] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Restricted Stock Awards Restricted Stock [Member] Options Awards Employee Stock Option [Member] Vesting [Axis] Vesting [Axis] Vesting [Domain] Vesting [Domain] Share-based Compensation Award, Tranche One Share-based Compensation Award, Tranche One [Member] Share-based Compensation Award, Tranche Two Share-based Compensation Award, Tranche Two [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Number of shares available for issuance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Additional shares authorized (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Expiration period Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Stock-based compensation expense Allocated Share-based Compensation Expense Stock-based compensation expense to be recognized through results of operations Fair Value of Investments Marketable Securities [Table Text Block] Maturities Investments Classified by Contractual Maturity Date [Table Text Block] Net Realized Investment Gains and Losses Realized Gain (Loss) on Investments [Table Text Block] Proceeds and Gross Realized Gains and Losses Schedule of Realized Gain (Loss) [Table Text Block] Unrealized Investment Appreciation Unrealized Gain (Loss) on Investments [Table Text Block] Investments in Unrealized Loss Position Schedule of Unrealized Loss on Investments [Table Text Block] Fair Value of Financial Instruments Fair Value Disclosures [Text Block] 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] Fair Value Estimate of Fair Value Measurement [Member] Carrying Value Reported Value Measurement [Member] Assets Investments Held-to-maturity securities Held-to-maturity Securities, Fair Value Mortgage loans Mortgages Held-for-sale, Fair Value Disclosure Policy loans Policy Loan, Fair Value Disclosure Policy Loan, Fair Value Disclosure Other long-term investments Other Long-term Investments, Fair Value Disclosure Other Long-term Investments, Fair Value Disclosure Short-term investments Cash and cash equivalents Corporate-owned life insurance Policy reserves Liability for Future Policy Benefits [Abstract] Annuity (accumulations) Liability For Annuity Accumulations, Fair Value Disclosure Liability For Annuity Accumulations, Fair Value Disclosure Annuity (benefit payments) Liability for Annuity Benefit Payments, Fair Value Disclosure Liability for Annuity Benefit Payments, Fair Value Disclosure Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Accounting Standards Update 2016-01 Accounting Standards Update 2016-01 [Member] Business Segments [Axis] Segments [Axis] Segment [Domain] Segments [Domain] Property and Casualty Insurance Property, Liability and Casualty Insurance Product Line [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Number of states in which we are licensed as insurer Number of States in which Entity Operates Number of business segments Number of Operating Segments Payment for income taxes Income Taxes Paid Federal tax refund received Proceeds from Income Tax Refunds Interest payments Interest Paid Decrease in DAC asset related to assumed realization of unrealized gains (losses) Deferred Policy Acquisition Costs, Period Increase (Decrease), Deferred Acquisition Cost Offset Adjustment Related to Assumed Realization of Unrealized Gains (Losses) Deferred Policy Acquisition Costs, Period Increase (Decrease), Deferred Acquisition Cost Offset Adjustment Related to Assumed Realization of Unrealized Gains (Losses) Federal income tax expense (benefit) Income Tax Expense (Benefit) Liability for unrecognized tax benefits Unrecognized Tax Benefits Net realized investment losses Equity Securities, FV-NI, Gain (Loss), Net Of Tax Equity Securities, FV-NI, Gain (Loss), Net Of Tax Retained earnings Future minimum lease payments due Operating Leases, Future Minimum Payments Due Future minimum payments due as a percentage of total assets Operating Leases, Future Minimum Payments Due As A Percentage Of Total Assets Operating Leases, Future Minimum Payments Due As A Percentage Of Total Assets Schedule of Gain (Loss) on Investments [Table] Schedule of Gain (Loss) on Investments [Table] Investment [Axis] Investment [Axis] Investment [Domain] Investment [Domain] Fixed maturities: Fixed Maturities [Member] 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] Available-for-sale Available-for-sale Securities [Member] Change in fair value Trading Account Assets, Change in Fair Value [Member] Trading Account Assets, Change in Fair Value [Member] Sales Trading Account Assets, Sales [Member] Trading Account Assets, Sales [Member] Gain (Loss) on Investments [Line Items] Gain (Loss) on Investments [Line Items] Net realized investment gains (losses) Available-for-sale Securities [Abstract] Available-for-sale Securities [Abstract] Proceeds from sales Proceeds from Sale of Available-for-sale Securities, Debt Gross realized gains Debt Securities, Available-For-Sale, Realized Gain Debt Securities, Available-For-Sale, Realized Gain Gross realized losses Debt Securities, Available-For-Sale, Realized Loss Debt Securities, Available-For-Sale, Realized Loss Fixed maturities, held-to-maturity securities, fair value Fixed maturities, available-for-sale securities, amortized cost Available-for-sale Debt Securities, Amortized Cost Basis Fixed maturities, trading securities, amortized cost Trading Securities, Debt, Amortized Cost Equity securities, amortized cost Equity Securities, FV-NI, Cost Equity Securities, FV-NI, Cost Allowance for doubtful accounts Premiums Receivable, Allowance for Doubtful Accounts Property and equipment accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares authorized (in shares) Common Stock, Shares Authorized Common stock, shares issued (in shares) Common Stock, Shares, Issued Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Accumulated Other Comprehensive Income (Loss) Comprehensive Income (Loss) Note [Text Block] Revenues Disposal Group, Including Discontinued Operation, Revenues [Abstract] Disposal Group, Including Discontinued Operation, Revenues [Abstract] Net premiums earned Disposal Group, Including Discontinued Operation, Premiums Earned, Net Disposal Group, Including Discontinued Operation, Premiums Earned, Net Investment income, net of investment expenses Disposal Group, Including Discontinued Operation, Net Investment Income Disposal Group, Including Discontinued Operation, Net Investment Income Net realized investment gains (losses) Disposal Group, Including Discontinued Operation, Realized Investment Gains (Losses) Disposal Group, Including Discontinued Operation, Realized Investment Gains (Losses) Other income Disposal Group, Including Discontinued Operation, Other Income Total revenues Disposal Group, Including Discontinued Operation, Revenue Benefits, Losses and Expenses Disposal Group, Including Discontinued Operation, Benefits, Losses and Expenses [Abstract] Disposal Group, Including Discontinued Operation, Benefits, Losses and Expenses [Abstract] Losses and loss settlement expenses Disposal Group, Including Discontinued Operation, Policyholder Benefits and Claims Incurred, Net Disposal Group, Including Discontinued Operation, Policyholder Benefits and Claims Incurred, Net Increase in liability for future policy benefits Disposal Group, Including Discontinued Operation, Liability for Future Policy Benefits, Period Expense (Income) Disposal Group, Including Discontinued Operation, Liability for Future Policy Benefits, Period Expense (Income) Amortization of deferred policy acquisition costs Disposal Group, Including Discontinued Operation, Deferred Policy Acquisition Cost, Amortization Expense and Amortization of Value of Business Acquired (VOBA) Disposal Group, Including Discontinued Operation, Deferred Policy Acquisition Cost, Amortization Expense and Amortization of Value of Business Acquired (VOBA) Other underwriting expenses Disposal Group, Including Discontinued Operation, Other Underwriting Expense Disposal Group, Including Discontinued Operation, Other Underwriting Expense Interest on policyholders’ accounts Disposal Group, Including Discontinued Operation, Interest Credited to Policyholders Account Balances Disposal Group, Including Discontinued Operation, Interest Credited to Policyholders Account Balances Total benefits, losses and expenses Disposal Group, Including Discontinued Operation, Benefits, Losses and Expenses Disposal Group, Including Discontinued Operation, Benefits, Losses and Expenses Income (loss) from discontinued operations before income taxes Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax Federal income tax expense Discontinued Operation, Tax Effect of Discontinued Operation Income from discontinued operations, net of taxes Earnings per common share from discontinued operations: Earnings Per Share, Basic And Diluted, Discontinued Operations [Abstract] Earnings Per Share, Basic And Diluted, Discontinued Operations [Abstract] Basic (in dollars per share) Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share Diluted (in dollars per share) Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share Earnings Per Share [Abstract] Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table] Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table] Restricted Stock Unit Awards Stock Options Basic and Diluted Earnings per Share [Line Items] Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] Net income from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Weighted-average common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Add dilutive effect of share-based awards outstanding (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Weighted-average common shares for EPS calculation (in shares) Weighted Average Number of Shares Outstanding, Diluted Earnings (loss) per common share from continuing operations, basic (in dollars per share) Income (Loss) from Continuing Operations, Per Basic Share Earnings (loss) per common share from continuing operations, diluted (in dollars per share) Income (Loss) from Continuing Operations, Per Diluted Share Earnings per common share from discontinued operations, basic (in dollars per share) Earnings per common share from discontinued operations, diluted (in dollars per share) Gain on sale of discontinued operations, net of taxes, basic (in dollars per share) Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax, Per Basic Share Gain on sale of discontinued operations, net of taxes, diluted (in dollars per share) Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax, Per Diluted Share Earnings (loss) per common share, basic (in dollars per share) Earnings Per Share, Basic Earnings (loss) per common share, diluted (in dollars per share) Earnings Per Share, Diluted Awards excluded from diluted earnings per share calculation (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Summary of Investments Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Disposal Groups, Including Discontinued Operations Disposal Groups, Including Discontinued Operations [Table Text Block] Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Sale of held-to-maturity securities Sale of Held-to-maturity Securities Sale of Held-to-maturity Securities Remaining potential contractual obligation Contractual Obligation Assets Disposal Group, Including Discontinued Operation, Assets [Abstract] Investments Disposal Group, Including Discontinued Operation, Investments [Abstract] Disposal Group, Including Discontinued Operation, Investments [Abstract] Fixed maturities Disposal Group, Including Discontinued Operation, Marketable Securities, Fixed [Abstract] Disposal Group, Including Discontinued Operation, Marketable Securities, Fixed [Abstract] Held-to-maturity, at amortized cost (fair value $0 in 2018 and $34 in 2017) Disposal Group, Including Discontinued Operation, Held-to-maturity Securities Disposal Group, Including Discontinued Operation, Held-to-maturity Securities Fixed maturities, held-to-maturity securities, fair value Disposal Group, Including Discontinued Operations, Held-to-maturity Securities, Fair Value Disposal Group, Including Discontinued Operations, Held-to-maturity Securities, Fair Value Available-for-sale, at fair value (amortized cost $0 in 2018 and $1,412,291 in 2017) Disposal Group, Including Discontinued Operation, Available-for-sale Securities, Debt Securities Disposal Group, Including Discontinued Operation, Available-for-sale Securities, Debt Securities Fixed maturities, available-for-sale securities, amortized cost Disposal Group, Including Discontinued Operations, Available-for-sale Debt Securities, Amortized Cost Basis Disposal Group, Including Discontinued Operations, Available-for-sale Debt Securities, Amortized Cost Basis Equity Securities at fair value (cost $0 in 2018 and $5,099 in 2017) Disposal Group, Including Discontinued Operation, Equity Securities Disposal Group, Including Discontinued Operation, Equity Securities Equity securities, amortized cost Disposal Group, Including Discontinued Operations, Equity Securities, Amortized Cost Basis Disposal Group, Including Discontinued Operations, Equity Securities, Amortized Cost Basis Mortgage loans Disposal Group, Including Discontinued Operation, Mortgage Loans on Real Estate, Commercial and Consumer, Net Disposal Group, Including Discontinued Operation, Mortgage Loans on Real Estate, Commercial and Consumer, Net Policy loans Disposal Group, Including Discontinued Operation, Loans, Gross, Insurance Policy Disposal Group, Including Discontinued Operation, Loans, Gross, Insurance Policy Other long-term investments Disposal Group, Including Discontinued Operation, Other Long-term Investments Disposal Group, Including Discontinued Operation, Other Long-term Investments Total investments Disposal Group, Including Discontinued Operation, Investments Disposal Group, Including Discontinued Operation, Investments Cash and cash equivalents Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents Deferred policy acquisition costs Disposal Group, Including Discontinued Operation, Deferred Policy Acquisition Costs Disposal Group, Including Discontinued Operation, Deferred Policy Acquisition Costs Other assets Disposal Group, Including Discontinued Operation, Other Assets Total assets held for sale Liabilities Disposal Group, Including Discontinued Operation, Liabilities [Abstract] Future policy benefits and losses Disposal Group, Including Discontinued Operation, Liability for Future Policy Benefits, Life Disposal Group, Including Discontinued Operation, Liability for Future Policy Benefits, Life Deferred income taxes Disposal Group, Including Discontinued Operation, Deferred Tax Liabilities Accrued expenses and other liabilities Disposal Group, Including Discontinued Operation, Accrued Expenses and Other Liabilities Disposal Group, Including Discontinued Operation, Accrued Expenses and Other Liabilities Total liabilities held for sale Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Equities Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Beginning Balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Net unrealized gains (losses) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Ending Balance Schedule of Marketable Securities [Table] Schedule of Marketable Securities [Table] Schedule of Marketable Securities [Table] Reconciliation of the Amortized Costs to Fair Value [Line Items] Schedule of Marketable Securities [Line Items] Schedule of Marketable Securities [Line Items] HELD-TO-MATURITY Held-to-maturity Securities, Debt Maturities [Abstract] Amortized Cost Gross Unrealized Appreciation Held-to-maturity Securities, Accumulated Unrecognized Holding Gain Gross Unrealized Depreciation Held-to-maturity Securities, Accumulated Unrecognized Holding Loss Fair Value AVAILABLE-FOR-SALE Fixed maturities: Available-for-sale Debt Securities, Amortized Cost Basis [Abstract] Amortized Cost Gross Unrealized Appreciation Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax Gross Unrealized Depreciation Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax Fair Value Equity securities: Available-for-sale Equity Securities, Amortized Cost Basis [Abstract] Cost or Amortized Cost Available-for-sale Equity Securities, Amortized Cost Basis Gross Unrealized Appreciation Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax Gross Unrealized Depreciation Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax Fair Value Amortized Cost Available-for-sale Securities, Amortized Cost Basis Gross Unrealized Appreciation Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax Gross Unrealized Depreciation Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Change in net unrealized investment appreciation Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments, Net of Tax [Abstract] Available-for-sale fixed maturities Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss) before Taxes Available-for-sale equity securities Equity Securities, Change in Net Unrealized Holding Gain (Loss), Before Tax Equity Securities, Change in Net Unrealized Holding Gain (Loss), Before Tax Deferred policy acquisition costs Deferred Policy Acquisition Cost, Unrealized Investment Gain (Loss) Income tax effect Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax Net unrealized investment depreciation of discontinued operations, sold Other Comprehensive Income (Loss), Available-For-Sale Securities Adjustment, Securities Sold, Net Of Tax, Portion Attributable To Parent Other Comprehensive Income (Loss), Available-For-Sale Securities Adjustment, Securities Sold, Net Of Tax, Portion Attributable To Parent Cumulative change in accounting principles Total change in net unrealized investment appreciation, net of tax Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Unrestricted Stock Awards Unrestricted Stock Awards [Member] Unrestricted Stock Awards [Member] Authorized Shares Available for Future Award Grants Share-based Compensation Arrangement by Share-based Payment Award Available for Grant [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award Available for Grant [Roll Forward] Beginning balance (in shares) Number of awards granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Grants in Period, Gross Share-based Compensation Arrangement by Share-based Payment Award, Grants in Period, Gross Number of awards forfeited or expired (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Forfeitures and Expiration in Period Number of share-based compensation awards forfeited or expired in Period Ending balance (in shares) Number of option awards exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Number of restricted stock awards vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Earnings Per Common Share Earnings Per Share [Text Block] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Net unrealized appreciation on investments Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] Liability for underfunded employee benefit costs Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Total Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Roll Forward] Change in accumulated other comprehensive income before reclassifications OCI, before Reclassifications, Net of Tax, Attributable to Parent Reclassification adjustments from accumulated other comprehensive income (loss) Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Schedule of Deferred Policy Acquisition Costs [Table] Schedule of Deferred Policy Acquisition Costs [Table] Schedule of Deferred Policy Acquisition Costs [Table] Life Insurance Life Insurance Product Line [Member] Deferred Policy Acquisition Costs Disclosure [Line Items] Deferred Policy Acquisition Costs Disclosure [Line Items] Deferred Policy Acquisition Costs Disclosure [Line Items] Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] Recorded asset at beginning of period Underwriting costs deferred Deferred Policy Acquisition Costs, Additions Amortization of deferred policy acquisition costs Deferred Policy Acquisition Costs, Amortization Expense Ending unamortized deferred policy acquisition costs Deferred Policy Acquisition Costs Impact of unrealized gains and losses on available-for-sale securities Sale of discontinued operations Deferred Policy Acquisition Costs, Disposition Recorded asset at end of period Schedule of Liability for Unpaid Claims and Claims Adjustment Expense Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block] Document and Entity Information [Abstract] Document and Entity Information [Abstract] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Trading Symbol Trading Symbol 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 Entity Common Stock, Shares Outstanding (in shares) Entity Common Stock, Shares Outstanding Schedule of Investments [Table] Schedule of Investments [Table] Schedule of Investments [Line Items] Schedule of Investments [Line Items] AVAILABLE-FOR-SALE Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] Number of Issues Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions [Abstract] Less than 12 months Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year 12 months or longer Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] Less than 12 months Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 12 months or longer Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Total Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Gross Unrealized Depreciation Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract] Less than 12 months Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 12 months or longer Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Total Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss Nature of Operations and Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Debt Disclosure [Abstract] Credit Facility Debt Disclosure [Text Block] Gross liability for losses and loss settlement expenses at beginning of year Liability for Claims and Claims Adjustment Expense Ceded losses and loss settlement expenses Liability for Unpaid Claims and Claims Adjustment Expense, Ceded Loss and Loss Settlement Expense Liability for Unpaid Claims and Claims Adjustment Expense, Ceded Loss and Loss Settlement Expense Net liability for losses and loss settlement expenses at beginning of year Liability for Unpaid Claims and Claims Adjustment Expense, Net Losses and loss settlement expenses incurred for claims occurring during Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract] Current year Current Year Claims and Claims Adjustment Expense Prior years Prior Year Claims and Claims Adjustment Expense Total incurred Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Losses and loss settlement expense payments for claims occurring during Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract] Current year Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year Prior years Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years Total paid Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid Net liability for losses and loss settlement expenses at end of year Ceded loss and loss settlement expenses Gross liability for losses and loss settlement expenses at end of period Collateralized mortgage obligations Collateralized Mortgage Obligations [Member] Held-To-Maturity, Amortized Cost Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract] Due in one year or less Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount Due after one year through five years Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount Due after five years through 10 years Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount Due after 10 years Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount Securities not categorized by contractual maturity Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Net Carrying Amount Held-To-Maturity, Fair Value Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] Due in one year or less Held-to-maturity Securities, Debt Maturities, Next Twelve Months, Fair Value Due after one year through five years Held-to-maturity Securities, Debt Maturities, Year Two Through Five, Fair Value Due after five years through 10 years Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value Due after 10 years Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value Securities not categorized by contractual maturity Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value Fair Value Available-For-Sale, Amortized Cost Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] Due in one year or less Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis Due after one year through five years Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis Due after five years through 10 years Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis Due after 10 years Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis Securities not categorized by contractual maturity Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis Available-For-Sale, Fair Value Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] Due in one year or less Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value Due after one year through five years Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value Due after five years through 10 years Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value Due after 10 years Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value Securities not categorized by contractual maturity Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value Fair Value Trading, Amortized Cost Trading Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] [Roll Forward] Trading Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] Due in one year or less Trading Securities, Debt Maturities, within One Year, Amortized Cost Basis Trading Securities, Debt Maturities, within One Year, Amortized Cost Basis Due after one year through five years Trading Securities, Debt Maturities, after One Through Five Years, Amortized Cost Basis Trading Securities, Debt Maturities, after One Through Five Years, Amortized Cost Basis Due after five years through 10 years Trading Securities, Debt Maturities, after Five Through Ten Years, Amortized Cost Basis Trading Securities, Debt Maturities, after Five Through Ten Years, Amortized Cost Basis Due after 10 years Trading Securities, Debt Maturities, after Ten Years, Amortized Cost Basis Trading Securities, Debt Maturities, after Ten Years, Amortized Cost Basis Amortized Cost Trading, Fair Value Trading Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] Trading Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] Due in one year or less Trading Securities, Debt Maturities, within One Year, Fair Value Trading Securities, Debt Maturities, within One Year, Fair Value Due after one year through five years Trading Securities, Debt Maturities, after One Through Five Years, Fair Value Trading Securities, Debt Maturities, after One Through Five Years, Fair Value Due after five years through 10 years Trading Securities, Debt Maturities, after Five Through Ten Years, Fair Value Trading Securities, Debt Maturities, after Five Through Ten Years, Fair Value Due after 10 years Trading Securities, Debt Maturities, after Ten Years, Fair Value Trading Securities, Debt Maturities, after Ten Years, Fair Value Fair Value Line of Credit Facility [Table] Line of Credit Facility [Table] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Credit Facility [Member] Revolving Credit Facility [Member] Letter of Credit Letter of Credit [Member] Swing Line of Credit Swing Line of Credit [Member] Swing Line of Credit [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Credit agreement term Debt Instrument, Term Debt covenant, maximum debt to total capitalization ratio Debt Covenant, Maximum Debt to Total Capitalization Ratio Debt Covenant, Maximum Debt to Total Capitalization Ratio Outstanding balance on credit facility Long-term Line of Credit Interest expense incurred Interest Expense Segment Reporting [Abstract] Property and Casualty Insurance Number of domestic locations Number of Business Locations Number of Business Locations Revenues Revenues [Abstract] Net premiums earned Premiums Earned, Net Investment income, net of investment expenses Net Investment Income Net realized investment gains (losses) (includes reclassifications for net unrealized investment gains on available-for-sale securities of $37 in 2018 and $3,405 in 2017; previously included in accumulated other comprehensive income) Total revenues Revenues Benefits, Losses and Expenses Benefits, Losses and Expenses [Abstract] Losses and loss settlement expenses Policyholder Benefits and Claims Incurred, Net Amortization of deferred policy acquisition costs Deferred Policy Acquisition Cost, Amortization Expense and Amortization of Value of Business Acquired (VOBA) Deferred Policy Acquisition Cost, Amortization Expense and Amortization of Value of Business Acquired (VOBA) Other underwriting expenses (includes reclassifications for employee benefit costs of $1,660 in 2018 and $1,352 in 2017; previously included in accumulated other comprehensive income) Other Underwriting Expense Total benefits, losses and expenses Benefits, Losses and Expenses Income from continuing operations before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Federal income tax expense (includes reclassifications of $341 in 2018 and ($718) in 2017; previously included in accumulated other comprehensive income) Income from continuing operations Income (loss) from discontinued operations, net of taxes Net income Other comprehensive income Other Comprehensive Income (Loss), Net of Tax [Abstract] Change in net unrealized appreciation on investments Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax Change in liability for underfunded employee benefit plans Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax Other comprehensive income, before tax and reclassification adjustments Other Comprehensive Income (Loss), before Reclassifications, before Tax Income tax effect Other Comprehensive Income (Loss) before Reclassifications, Tax Other comprehensive income, after tax, before reclassification adjustments Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Reclassification adjustment for net realized investment gains included in income Total reclassification adjustments, before tax Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax Income tax effect Total reclassification adjustments, after tax Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Diluted weighted average common shares outstanding (in shares) Earnings per common share from continuing operations: Earnings Per Share, Basic And Diluted, Continuing Operations [Abstract] Earnings Per Share, Basic And Diluted, Continuing Operations [Abstract] Basic (in dollars per share) Diluted (in dollars per share) Earnings per common share: Earnings Per Share, Basic and Diluted [Abstract] Basic (in dollars per share) Diluted (in dollars per share) Components of Basic and Diluted Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Segment Information Segment Reporting Disclosure [Text Block]