Fair Value Disclosures [Abstract] Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Investments [Abstract] 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] Retirement Benefits [Abstract] Employee Benefits Pension and Other Postretirement Benefits Disclosure [Text Block] Debt Disclosure [Abstract] Credit Facility Debt Disclosure [Text Block] Share-based Payment Arrangement, Noncash Expense [Abstract] 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] Award Type [Domain] Award Type [Domain] Options Awards Share-based Payment Arrangement, Option [Member] Unrestricted Stock Awards Unrestricted Stock Awards [Member] Unrestricted Stock Awards [Member] Restricted Stock Awards Restricted Stock [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] 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) 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 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 Organization, Consolidation and Presentation of Financial Statements [Abstract] Components of Deferred Acquisition Costs Schedule of Deferred Policy Acquisition Costs [Table Text Block] Schedule of Deferred Policy Acquisition Costs [Table Text Block] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Retained earnings Retained Earnings [Member] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Accounting Standards Update 2016-02 Accounting Standards Update 2016-02 [Member] Accounting Standards Update 2016-01 Accounting Standards Update 2016-01 [Member] Operating Activities [Axis] Operating Activities [Axis] Operating Activities [Domain] Operating Activities [Domain] Continuing and Discontinuing Operations Continuing and Discontinuing Operations [Member] Continuing and Discontinuing Operations [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, Excluding Capitalized Interest, Operating Activities Federal income tax expense (benefit) Income Tax Expense (Benefit) Liability for unrecognized tax benefits Unrecognized Tax Benefits Number of variable interest entities Variable Interest Entity, Number Of Entities Variable Interest Entity, Number of Entities Initial investment in variable interest entity Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets VIE maximum exposure Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Lease liability Operating Lease, Liability Cumulative effect of change in accounting principle Cumulative Effect of New Accounting Principle in Period of Adoption Leases [Abstract] Components of lease expense: Lease, Cost [Abstract] Operating lease expense Operating Lease, Expense Less sublease income Sublease Income Net lease expense Lease, Cost Operating cash outflow from operating leases Operating Lease, Payments Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Loans Insured or Guaranteed by Government Authorities [Axis] Loans Insured or Guaranteed by Government Authorities [Axis] Loans Insured or Guaranteed by Government Authorities [Domain] Loans Insured or Guaranteed by Government Authorities [Domain] Government National Mortgage Association (GNMA) Insured Loans Government National Mortgage Association (GNMA) Insured Loans [Member] Federal Home Loan Mortgage Corporation (FHLMC) Insured Loans Federal Home Loan Mortgage Corporation (FHLMC) Insured Loans [Member] Federal National Mortgage Association (FNMA) Insured Loans Federal National Mortgage Association (FNMA) Insured Loans [Member] Measurement Frequency [Axis] Measurement Frequency [Axis] Measurement Frequency [Domain] Measurement Frequency [Domain] Recurring Fair Value, Recurring [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [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 Debt Security, Government, Non-US [Member] Public utilities Public Utility, Bonds [Member] Corporate bonds Corporate Debt Securities [Member] Mortgage-backed securities Collateralized Mortgage Backed Securities [Member] Collateralized mortgage obligations Collateralized Mortgage Obligations [Member] Asset-backed securities Asset-backed Securities [Member] Redeemable preferred stocks Redeemable Preferred Stock [Member] Nonredeemable preferred stocks Nonredeemable 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] 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] 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] 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 Debt Securities, Available-for-sale Trading securities Debt Securities, Trading Equity securities 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 Equity [Abstract] Schedule of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table 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 2019 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 Stock-Based Compensation Share-based Payment Arrangement [Text Block] Discontinued Operations and Disposal Groups [Abstract] Discontinued Operations Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Equities Equity Securities [Member] 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 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Ending Balance 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] 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 Net income (loss) from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Earnings (loss) 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, basic (in shares) Weighted Average Number of Shares Outstanding, Basic Weighted-average common shares outstanding, diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Add dilutive effect of share-based awards outstanding (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 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 (loss) per common share from discontinued operations, basic (in dollars per share) Earnings (loss) 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 per common share, basic (in dollars per share) Earnings Per Share, Basic Earnings 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 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 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 Schedule of Gain (Loss) on Securities [Table] Schedule of Gain (Loss) on Securities [Table] Discontinued Operations Discontinued Operations [Member] Investment [Axis] Investment [Axis] Investment [Domain] Investment [Domain] Fixed Maturities Fixed Maturities [Member] Equity securities Mortgages Mortgages [Member] Debt Security Category [Axis] Debt Security Category [Axis] Gain (Loss) on Investments, Including Marketable Securities and Investments Held at Cost, Categories of Investments [Domain] Other than Temporary Impairment, Credit Losses Recognized in Earnings, Categories of Investments [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 Securities [Line Items] Gain (Loss) on Securities [Line Items] Net realized investment gains (losses) Realized Investment Gains (Losses) Debt Securities, Available-for-sale [Abstract] Debt Securities, Available-for-sale [Abstract] Proceeds from sales Proceeds from Sale of Debt Securities, Available-for-sale Gross realized gains Debt Securities, Available-for-sale, Realized Gain Gross realized losses Debt Securities, Available-for-sale, Realized Loss Net Periodic Benefit Cost Schedule of Net Benefit Costs [Table Text Block] Nature of Operations and Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Investment Type [Axis] Investment Type [Axis] Investments [Domain] Investments [Domain] 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 Assets [Abstract] Investments Mortgage loans Mortgage Loans on Real Estate, Commercial and Consumer, Net 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 Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Net unrealized appreciation on investments AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] Liability for underfunded employee benefit costs Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Total AOCI Attributable to Parent [Member] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning Balance Stockholders' Equity Attributable to Parent 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 Ending Balance Statement of Financial Position [Abstract] Available-for-sale securities, amortized cost Debt Securities, Available-for-sale, Amortized Cost Trading securities, amortized cost Debt Securities, Trading, Amortized Cost Equity securities, amortized cost Equity Securities, FV-NI, Cost Allowance for doubtful accounts Premium Receivable, Allowance for Credit Loss 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 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] AVAILABLE-FOR-SALE Fixed maturities: Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] Amortized Cost Gross Unrealized Appreciation Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax Gross Unrealized Depreciation Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax Fair Value Earnings Per Common Share Earnings Per Share [Text Block] 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 Discontinued Operation, Period of Continuing Involvement after Disposal Cash received as part of the TSA agreement Discontinued Operation, Amount of Continuing Cash Flows after Disposal Operating lease right-of-use assets (Other assets on Consolidated Balance Sheets) Operating lease liabilities (Accrued expenses and other liabilities on Consolidated Balance Sheets) Right-of-use assets obtained in exchange for new operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Weighted average remaining lease term Operating Lease, Weighted Average Remaining Lease Term Weighted average discount rate Operating Lease, Weighted Average Discount Rate, Percent 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 loss from discontinued operations, net of taxes 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 Payment Arrangement, Noncash Expense Net realized investment (gains) losses Net cash flows from equity and 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 call and maturity of available-for-sale investments Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale 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 Debt Securities, Available-for-sale Purchase of mortgage loans Payments to Acquire Loans Receivable 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, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Less: increase in cash and cash equivalents - discontinued operations Net Cash Provided by (Used in) Discontinued Operations Net increase 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, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash and Cash Equivalents at End of Period - Continuing Operations Schedule of Deferred Policy Acquisition Costs [Table] Schedule of Deferred Policy Acquisition Costs [Table] Schedule of Deferred Policy Acquisition Costs [Table] 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 Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Net Underwriting costs deferred Deferred Policy Acquisition Cost, Capitalization Amortization of deferred policy acquisition costs Deferred Policy Acquisition Costs, Amortization Expense Recorded asset at beginning of period Summary of Investments Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Insurance Loss Reserves [Abstract] Changes in Property and Casualty Losses and Loss Settlement Expense Reserves Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block] 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, Qualitative Disclosure [Abstract] Number of Issues Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract] Less than 12 months (issues) Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions 12 months or longer (issues) Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions Fair Value Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] Less than 12 months Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 12 months or longer Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer Total Debt Securities, Available-for-sale, Unrealized Loss Position Gross Unrealized Depreciation Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] Less than 12 months Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 12 months or longer Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Total Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss Cover page. Document Type Document Type Document Quarterly Report Document Quarterly Report Document Period End Date Document Period End Date Document Transition Report Document Transition Report Entity File Number Entity File Number Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Tax Identification Number Entity Address, Address Line One Entity Address, Address Line One Entity Address, City or Town Entity Address, City or Town Entity Address, State or Province Entity Address, State or Province Entity Address, Postal Zip Code Entity Address, Postal Zip Code City Area Code City Area Code Local Phone Number Local Phone Number Entity Current Reporting Status Entity Current Reporting Status Entity Interactive Data Current Entity Interactive Data Current Entity Filer Category Entity Filer Category Entity Emerging Growth Company Entity Emerging Growth Company Entity Small Business Entity Small Business Entity Shell Company Entity Shell Company Title of 12(b) Security Title of 12(b) Security Trading Symbol Trading Symbol Security Exchange Name Security Exchange Name Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date 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 Accumulated Other Comprehensive Income (Loss) Comprehensive Income (Loss) Note [Text Block] Trading securities Debt Securities, Trading, and Equity Securities, FV-NI Remaining potential contractual obligation Contractual Obligation Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] 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 at beginning of year 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 losses and loss settlement expenses at end of year Gross liability for losses and loss settlement expenses at end of period Leases Lessee, Operating Leases [Text Block] Segment Reporting [Abstract] Number of domestic locations Number of Business Locations Number of Business Locations Reserves for Losses and Loss Settlement Expenses Liability for Future Policy Benefits and Unpaid Claims Disclosure [Text Block] Components of Operating Leases Lease, Cost [Table Text Block] Lease Balance Sheet Information Assets And Liabilities, Lessee [Table Text Block] Assets And Liabilities, Lessee [Table Text Block] Maturity of Lease Liabilities Lessee, Operating Lease, Liability, Maturity [Table Text Block] Vesting [Axis] Vesting [Axis] Vesting [Domain] Vesting [Domain] Share-based Compensation Award, Tranche One Share-based Payment Arrangement, Tranche One [Member] Share-based Compensation Award, Tranche Two Share-based Payment Arrangement, Tranche Two [Member] Number of shares available for issuance (in shares) Award vesting rights Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Expiration period Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Stock-based compensation expense Share-based Payment Arrangement, Expense Stock-based compensation expense to be recognized through results of operations Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount 2019 Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year 2020 Lessee, Operating Lease, Liability, Payments, Due Year Two 2021 Lessee, Operating Lease, Liability, Payments, Due Year Three 2022 Lessee, Operating Lease, Liability, Payments, Due Year Four 2023 Lessee, Operating Lease, Liability, Payments, Due Year Five Thereafter Lessee, Operating Lease, Liability, Payments, Due after Year Five Total lease payments Lessee, Operating Lease, Liability, Payments, Due Less imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Common stock Common Stock [Member] Additional paid-in capital Additional Paid-in Capital [Member] Accumulated other comprehensive income Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance, beginning of year (in shares) Net income (loss) Shares repurchased (in shares) Stock Repurchased During Period, Shares Shares repurchased Stock Repurchased During Period, Value Stock based compensation (in shares) Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture Stock based compensation APIC, Share-based Payment Arrangement, Increase for Cost Recognition Dividends on common stock Dividends, Common Stock Change in net unrealized investment appreciation 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 Cumulative effect of change in accounting principle Balance, end of year (in shares) Activity in Stock Award Plans Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] Remaining Stock-Based Compensation Expense Share-based Payment Arrangement, Nonvested Award, Cost [Table Text Block] Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Statistical Measurement [Axis] Statistical Measurement [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Remaining lease terms Lessee, Operating Lease, Remaining Lease Term Lessee, Operating Lease, Remaining Lease Term Lease extension option terms Lessee, Operating Lease, Renewal Term 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] Leases Lessee, Leases [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] ASSETS Investments Fixed maturities Debt Securities [Abstract] Available-for-sale, at fair value (amortized cost $1,653,296 in 2019 and $1,761,289 in 2018) Trading securities, at fair value (amortized cost $12,932 in 2019 and $11,277 in 2018) Equity securities at fair value (cost $65,409 in 2019 and $64,819 in 2018) Mortgage loans Other long-term investments Other Long-term Investments Short-term investments Other Short-term Investments Total investments Investments Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Accrued investment income Accrued Investment Income Receivable Premiums receivable (net of allowance for doubtful accounts of $1,208 in 2019 and $785 in 2018) Premiums Receivable, Net Deferred policy acquisition costs Property and equipment (primarily land and buildings, at cost, less accumulated depreciation of $42,118 in 2019 and $39,894 in 2018) Property, Plant and Equipment, Net Reinsurance receivables and recoverables Reinsurance Recoverables, Including Reinsurance Premium Paid Prepaid reinsurance premiums Prepaid Reinsurance Premiums Deferred tax asset Deferred Income Tax Assets, Net Income taxes receivable Income Taxes Receivable Goodwill and intangible assets Goodwill and intangible assets Goodwill and intangible assets Other assets Other 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. Deferred tax liability Deferred Income Tax Liabilities, Net TOTAL LIABILITIES Liabilities Stockholders’ Equity Stockholders' Equity Attributable to Parent [Abstract] Common stock, $0.001 par value; authorized 75,000,000 shares; 25,245,200 and 25,097,408 shares issued and outstanding in 2019 and 2018, 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 (loss), net of tax Accumulated Other Comprehensive Income (Loss), Net of Tax TOTAL STOCKHOLDERS’ EQUITY TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities and Equity 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] Carrying Value of Commercial Mortgage Loans by Loan-to-Value Ratio Schedule of Participating Mortgage Loans [Table Text Block] 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/(losses) on available-for-sale securities of $37 and $127 in 2019 and ($196) and ($159) in 2018; 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 $1,124 and $2,248 in 2019 and $1,661 and $3,321 in 2018; previously included in accumulated other comprehensive income) Other Underwriting Expense Total benefits, losses and expenses Benefits, Losses and Expenses Income (loss) from continuing operations before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Federal income tax expense (benefit) (includes reclassifications of ($2,325) and ($2,109) in 2019 and $390 and $731 in 2018; previously included in accumulated other comprehensive income) Income (loss) from continuing operations Income (loss) from discontinued operations, net of taxes Net income (loss) Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax [Abstract] Change in net unrealized appreciation on investments Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) 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 (loss), 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 (loss), after tax, before reclassification adjustments Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Reclassification adjustment for net realized investment (gains) losses 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 (loss) 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) Available-for-sale fixed maturities Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax Deferred policy acquisition costs Deferred Policy Acquisition Cost, Unrealized Investment Gain (Loss) Income tax effect Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax Net unrealized investment depreciation of discontinued operations, sold Disposal Group, Including Discontinued Operations, Unrecognized Unrealized Investment Appreciation (Depreciation) Disposal Group, Including Discontinued Operations, Unrecognized Unrealized Investment Appreciation (Depreciation) Cumulative change in accounting principles Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) Arising During Period, Cumulative Effect Of New Accounting Principle, after Tax Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) Arising During Period, Cumulative Effect Of New Accounting Principle, after Tax Total change in net unrealized investment appreciation, net of tax Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax Summary Operating Results of Discontinued Operations Disposal Groups, Including Discontinued Operations [Table Text Block] Components of Basic and Diluted Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Financing Receivable, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] Debt-to-Value [Axis] Debt-to-Value [Axis] Debt-to-Value [Domain] Debt-to-Value [Domain] Less than 65% Ltv Less Than 65 Percent [Member] Ltv Less Than 65 Percent [Member] 65%-75% Ltv 65 To 75 Percent [Member] Ltv 65 To 75 Percent [Member] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Total mortgage loans Commercial Mortgage Loans [Member] Commercial Mortgage Loans [Member] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Mortgage Loans by Region Geographic Concentration Risk [Member] Property Type Concentration Risk Property Type Concentration Risk [Member] Property Type Concentration Risk [Member] East North Central East North Central [Member] East North Central [Member] Southern Atlantic Southern Atlantic [Member] Southern Atlantic [Member] 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] Mountain Mountain [Member] Mountain [Member] Real Estate, Type of Property [Axis] Real Estate, Type of Property [Axis] Real Estate [Domain] Real Estate [Domain] Multifamily Multifamily [Member] Office Office Building [Member] Retail Retail Site [Member] Mixed use/Other Other Property [Member] Financing Receivable, Credit Quality Indicator [Line Items] Financing Receivable, Credit Quality Indicator [Line Items] Total amortized cost Financing Receivable, before Allowance for Credit Loss Allowance allowance Allowance for Loan and Lease Losses, Real Estate Carrying Value Percent of Total Concentration Risk, Percentage Segment Information Segment Reporting Disclosure [Text Block] Collateralized mortgage obligations Available-For-Sale, Amortized Cost Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract] Due in one year or less Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost Due after one year through five years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost Due after five years through 10 years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost Due after 10 years Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost Securities not categorized by contractual maturity Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost Due in one year or less Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value Due after one year through five years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value Due after five years through 10 years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value Due after 10 years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value Securities not categorized by contractual maturity Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value Available-for-sale securities, 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 2019 Future Share-based Compensation Expense, Remainder of Current Year Future Share-based Compensation Expense, Remainder of Current Year 2020 Future Share-based Compensation Expense, Year One Future Share-based Compensation Expense, Year One 2021 Future Share-based Compensation Expense, Year Two Future Share-based Compensation Expense, Year Two 2022 Future Share-based Compensation Expense, Year Three Future Share-based Compensation Expense, Year Three 2023 Future Share-based Compensation Expense, Year Four Future Share-based Compensation Expense, Year Four Total Dividends on common stock, per share (in dollars per share) Common Stock, Dividends, Per Share, Declared