Amendment Flag Current Fiscal Year End Date Document Period End Date Entities [Table] Entity Information [Line Items] Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Filer Category Entity Public Float Entity Registrant Name Entity Central Index Key Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Period Focus Document Type Entity Shell Company Entity Emerging Growth Company Entity Ex Transition Period Entity Small Business Investment [Axis] Investment [Domain] Investment [Domain] Award Date [Domain] Award Type [Axis] Award Date [Axis] Number of securities, total Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions Number of securities, Greater than 12 months Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year Workers' Compensation [Member] Accident and Health Insurance Product Line [Member] ASU 2016-18 [Member] Summary of Significant Accounting Policies [Abstract] ASU 2017-04 [Member] Accounting Standards Update 2017-04 [Member] ASU 2016-01 [Member] ASU 2016-01 [Member] ASU 2016-02 [Member] Accounts receivable--less allowance (2018, $403; 2017, $484) Accounts receivable Accounts Receivable, Net Accounts payable and other liabilities Accrued investment income Net unrealized gains (losses) on investments Accumulated Other Comprehensive Income (Loss), Debt Securities, Available-for-sale, Adjustment, after Tax Property and equipment, accumulated depreciation Net unrealized losses on foreign exchange adjustment Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax Other Comprehensive Income (Loss) [Member] Accumulated Other Comprehensive Income (Loss) [Member] Accumulated other comprehensive income (loss) Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated Other Comprehensive Income [Abstract] Additional paid-in capital Additional Paid-In Capital [Member] Additional Paid-in Capital [Member] Adjustments to reconcile net income (loss) to net cash provided by operating activities: Adjustments for New Accounting Pronouncements [Axis] Compensation cost charged against income Bond amortization Amortization of net policy acquisition costs Asset-backed Securities [Member] Asset-backed Securities [Member] Assets Assets Assets [Abstract] Total Assets, Fair Value Disclosure Total assets Total Assets Assumed Assumed from other companies Assumed Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] Gross unrealized gains Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax Gross unrealized loss, less than 12 months Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Gross unrealized losses Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Net unrealized gains (losses) Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax Fair value Available-for-sale Securities Number of Securities 12 months or less Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] Cost or amortized cost Available-for-sale Equity Securities, Amortized Cost Basis Gross unrealized losses Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax Cost or amortized cost Available-for-sale Securities, Amortized Cost Basis Gross unrealized gains Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax Gross unrealized loss, total Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss Gross unrealized loss, 12 months or longer Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract] Gross unrealized losses Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax Total contractual maturities, Cost or Amortized Cost Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost Available-for-sale Debt Securities [Abstract] Gross unrealized gains Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax Total contractual maturities, Fair Value Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value Available-for-Sale Securities Available-for-sale Securities [Table Text Block] Cost or amortized cost Debt Securities, Available-for-sale, Amortized Cost Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] Excess of five years to ten years, Cost or Amortized Cost Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost Fair value, 12 months or less Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value One year or less, Cost or Amortized Cost Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract] Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] Fair value, Greater than 12 months Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Fair value, total Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Excess of ten years, Cost or Amortized Cost Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost Excess of ten years, Fair Value Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value Excess of five years to ten years, Fair Value Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value Asset-backed securities, Fair Value Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value Excess of one year to five years, Fair Value Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value Total, Fair Value Fair value Excess of one year to five years, Cost or Amortized Cost Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost Asset-backed securities, Cost or Amortized Cost Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost Fair value Available-for-sale Securities, Equity Securities One year or less, Fair Value Total losses Available-for-sale Securities, Gross Realized Losses Total gains Expenses: Expenses [Abstract] Benefits, Losses and Expenses [Abstract] Total expenses Benefits, Losses and Expenses Bonds [Member] Description of Business Business Acquisition [Line Items] Business Acquisition, Acquiree [Domain] Business Acquisition [Axis] Acquisition and Related Goodwill and Intangibles [Abstract] Acquisition and Related Goodwill and Intangibles Business Combination Disclosure [Text Block] Business Combination [Abstract] Claims Development [Line Items] Net realized gains (losses) on investments, excluding impairment losses Carrying Value [Member] Cash and Cash Equivalents Cash and cash equivalents Cash, cash equivalents and restricted cash and cash equivalents at end of year Cash, cash equivalents and restricted cash and cash equivalents at beginning of year Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Cash, cash equivalents and restricted cash and cash equivalents at end of year Cash, cash equivalents and restricted cash and cash equivalents at beginning of year Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Increase (decrease) in cash, cash equivalents and restricted cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash equivalents Cash Equivalents, at Carrying Value Insurance company-owned life insurance Investments classified as cash and cash equivalents Ceded on assumed Ceded Premiums Earned Ceded on direct Ceded Premiums Written Certificates of Deposit [Member] Chief Executive Officer [Member] Class of Stock [Domain] Collateralized Mortgage Obligations [Member] Collateralized Mortgage Obligations [Member] Commercial Mortgage Loans [Member] Commercial Mortgage Loans [Member] Class A [Member] Class A (voting) [Member] Class A Voting [Member] Common Stock [Member] Common stock, shares authorized (in shares) Class B [Member] Class B (nonvoting) [Member] Class B Non-voting [Member] Stated value of common stock (in dollars per share) Cash dividends paid (in dollars per share) Dividends paid to shareholders (in dollars per share) Common Stocks [Member] Common Stocks, by Industry [Member] Common stock, shares outstanding (in shares) Common stock Employee Benefit Plans [Abstract] Employee Benefit Plans Compensation and Employee Benefit Plans [Text Block] Deferred tax assets [Abstract] Deferred tax liabilities [Abstract] Comprehensive Income (Loss) Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Concentrations of Credit Risk Concentration Risk Disclosure [Text Block] SCHEDULE II CONDENSED FINANCIAL INFORMATION OF REGISTRANT Condensed Financial Information of Parent Company Only Disclosure [Text Block] Basis of Presentation Consolidation, Policy [Policy Text Block] Corporate Securities [Member] Corporate Debt Securities [Member] Cumulative effect of adoption, net of tax Cumulative-effect adjustment to reclassify unrealized gains on equity securities after tax Current Net unrealized gains (losses) Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax Debt [Abstract] Debt Debt Disclosure [Text Block] Fixed Income Securities [Member] Fixed Maturities [Member] Debt Securities [Member] Limited partnership investments Deferred Tax Assets, Investments Total value of shares issued Provision for deferred federal income taxes Deferred Deferred Federal Income Tax Expense (Benefit) Amortization of gross deferred policy acquisition costs Deferred Policy Acquisition Costs, Amortization Expense Provision for deferred income tax expense (benefit) Deferred policy acquisition costs Provisions for deferred federal income taxes [Abstract] Total deferred tax liabilities Deferred Tax Liabilities, Gross Deferred federal income taxes Net deferred tax assets Deferred Tax Assets, Net Total deferred tax assets Deferred Tax Assets, Gross Other Deferred ceding commission Unearned premiums discount Deferred compensation Loss and loss expense reserves Other-than-temporary investment declines Deferred federal income taxes Net deferred tax liabilities Deferred acquisition costs Other Deferred Tax Liabilities, Other Deferred tax assets, valuation allowance Limited partnership investments Deferred tax liabilities amortized amount into income Deferred Tax Liabilities, Tax Deferred Income Unrealized gain on fixed income and equity security investments Defined Benefit Plan Disclosure [Line Items] Company's contribution to the plan Defined Contribution Plan [Abstract] Deposits from insureds Depository liabilities Depreciation Depreciation, Amortization and Accretion, Net Direct Direct premiums Direct Premiums Earned Direct Director [Member] Outside Director [Member] Stock Based Compensation [Abstract] Stock Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Dividend payable, date to be paid Dividends [Axis] Dividend payable (in dollars per share) Dividends [Domain] Dividend payable, date declared Dividend payable, date of record Subsequent Event [Abstract] Dividends, Common Stock [Abstract] Common stock dividends Dividends, Common Stock, Cash Due from affiliates Earnings (Loss) Per Share Earnings Per Share [Text Block] Earnings (Loss) Per Share Earnings Per Share, Policy [Policy Text Block] Basic and diluted earnings (loss) (in dollars per share) Net income (loss) per share (in dollars per share) Earnings (Loss) Per Share [Abstract] Per share data: Effect of foreign exchange rates on cash and cash equivalents Corporate income tax rate Realized gains on equity securities Equity Securities, FV-NI, Realized Gain Realized losses on equity securities sold during the period Equity Securities, FV-NI, Realized Gain (Loss) Losses on equity securities [Abstract] Equity Securities, FV-NI, Gain (Loss), Alternative [Abstract] Unrealized losses on equity securities held at the end of the period Equity Securities, FV-NI, Unrealized Gain (Loss) Realized and unrealized losses on equity securities held at the end of the period Equity Securities, FV-NI, Gain (Loss) Equity Component [Domain] Total equity securities Equity securities Equity Securities, FV-NI Limited partnerships Limited partnerships (Affiliated: 2018, $32,028; 2017, $43,586) Equity Method Investments Dividends on Equity Securities [Member] Equity Securities [Member] Equity Securities [Member] Fair Value [Member] Estimate of Fair Value Measurement [Member] Executives [Member] Executive Officer [Member] Intangible assets acquired Fair Value Measurements Total gains or losses (realized) included in income Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value [Abstract] Measurement Basis [Axis] Measurement Frequency [Axis] Fair Value Hierarchy and NAV [Axis] Recurring [Member] Fair Value, Measurements, Recurring [Member] Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Transfers into Level 3 Transfers out of Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Fair Value, Measurement Frequency [Domain] Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Fair Value Hierarchy and NAV [Domain] Fair Value Fair Value Disclosures [Text Block] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Carrying Value and Fair Value by Level of Financial Instruments 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] Fair Value, by Balance Sheet Grouping [Table] Fair Value Measurement [Domain] Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Level 2 [Member] Fair Value, Inputs, Level 2 [Member] End of period balance Beginning of period balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Reconciliation of Beginning and Ending Balances of Assets Measured at Fair Value on Recurring Basis Using Level 3 Inputs Federal income tax expense (benefit) Federal Income Tax Expense (Benefit), Continuing Operations Financial Instrument [Axis] Liabilities [Abstract] Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Assets [Abstract] Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Accumulated amortization on intangible assets Total Fixed Income Securities [Member] Interest on Fixed Income Securities [Member] Total Fixed Maturities [Member] Non-U.S. Government Obligations [Member] Debt Security, Government, Non-US [Member] Net realized and unrealized gains (losses) on investments Net realized and unrealized gains (losses) on investments Net realized gains (losses) on investments Gain (Loss) on Investments Net realized (gains) losses on investments Gain (Loss) on Sale of Investments Loss on sale of property and equipment Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Recorded goodwill Goodwill Goodwill impairment charge Goodwill impairment loss Goodwill, Impairment Loss Goodwill and Other Intangible Assets [Abstract] Goodwill and Other Intangible Assets Other-than-temporary impairment losses on investments Other than Temporary Impairment Losses, Investments Income Taxes [Abstract] Income (loss) before federal income tax expense (benefit) Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Equity in undistributed income of subsidiaries Income (Loss) from Equity Method Investments Income (loss) before federal income tax benefit and equity in undistributed income of subsidiaries Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Consolidated Statements of Operations [Abstract] Condensed Statements of Income [Abstract] Federal income tax expense (benefit) Federal income tax expense (benefit) Federal income tax benefit Summary of the difference between federal income tax expense computed at statutory rate [Abstract] Effective Income Tax Rate Reconciliation, Amount [Abstract] Taxes (benefit) on pre-tax income (loss) [Abstract] Income Taxes Income Tax Disclosure [Text Block] Current federal income taxes recoverable Tax effect of (deduction) [Abstract] Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount [Abstract] Statutory federal income rate applied to pre-tax income (loss) Other Effective Income Tax Rate Reconciliation, Deduction, Other, Amount Change in enacted tax rates Tax-exempt investment income Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount Cash paid for income taxes, net of refunds Income Taxes Paid, Net Deferred Taxes Income Tax, Policy [Policy Text Block] Income after federal income taxes and equity in undistributed income of subsidiaries Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Change in losses and loss expenses reserves, net of reinsurance Change in accrued investment income Increase (Decrease) in Accrued Investment Income Receivable Net policy acquisition costs deferred Increase (Decrease) in Deferred Policy Acquisition Costs Change in accounts receivable and unearned premium Increase (Decrease) in Premiums Receivable Change in other assets, other liabilities and current income taxes Increase (Decrease) in Other Operating Assets and Liabilities, Net Change in reinsurance recoverable on paid losses Increase (Decrease) in Reinsurance Recoverable Increase (Decrease) in Stockholders' Equity [Roll Forward] Industrial [Member] Industrial, Miscellaneous, and All Others [Member] Loss and Loss Expense Reserves Insurance Disclosure [Text Block] Reserves: Loss and Loss Expense Reserves [Abstract] Cash paid for interest Unrealized appreciation (depreciation) on investments Investments [Domain] Investment [Domain] Investments [Domain] Investment Income Investment Income, Interest and Dividend Investments Investment, Policy [Policy Text Block] Cash dividends from subsidiaries Investment Income, Dividend Significant investment in public and private equity markets in India, value Major Categories of Investment Income Investment Income [Table Text Block] Investment Income, Net [Abstract] Investment expenses Investment Income, Investment Expense Net investment income Investment Income, Net Investment Type [Axis] Fair Value and Cost or Amortized Cost of Fixed Maturity Investments by Contractual Maturity Investments Classified by Contractual Maturity Date [Table Text Block] Total Investments [Member] Investments [Member] Investment in subsidiaries Investments [Abstract] Investments: Investments other than subsidiaries [Abstract] Total Investments Investments Investments Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Leases Leases of Lessee Disclosure [Text Block] Leases [Abstract] Liabilities and shareholders' equity Liabilities and shareholders' equity [Abstract] Total liabilities Total Liabilities Total liabilities and shareholders' equity Liabilities and Equity Liabilities [Abstract] Liabilities [Abstract] Premiums payable Total incurred losses and loss expenses Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Losses and loss expenses Total gross liability for unpaid claims and claims adjustment expense Claims occurring during prior years Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years Total Reserves Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense Claims occurring during the current year Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year Activity in the reserve for losses and loss expenses [Roll Forward] Provision for losses and loss expenses [Abstract] Reinsurance recoverable on unpaid losses at the end of the year Reinsurance recoverable on unpaid losses at the beginning of the year Liability for Unpaid Claims and Claims Adjustment Expense, Reported Claims, Amount Reserves at the beginning of the year Reserves at the end of the year Liability for Unpaid Claims and Claims Adjustment Expense, Net Reserves for Losses and Loss Expenses Loss and loss expense payments [Abstract] Limited partnerships, affiliated Total partners' capital Limited Partners' Capital Account Limited Partners' Capital Account [Abstract] Outstanding drawings on line of credit Long-term Line of Credit Line of credit maturity date Maximum credit limit Line of Credit Facility, Maximum Borrowing Capacity Remaining amount under line of credit Line of Credit Facility, Remaining Borrowing Capacity Effective interest rate Line of Credit Facility, Interest Rate at Period End Commercial mortgage loans, valuation allowance Commercial mortgage loans Bank loans Loans Receivable, Fair Value Disclosure Marketable Securities [Line Items] Marketable Securities [Table] Agency Mortgage Backed Securities [Member] Agency Mortgage-backed Securities [Member] Mortgage-backed Securities [Member] Collateralized Mortgage Backed Securities [Member] Bank Loans [Member] Mortgage-backed Securities, Issued by Private Enterprises [Member] Commercial mortgage loans Mortgage-backed securities Mortgage-backed Securities Available-for-sale, Fair Value Disclosure Financing activities Financing activities [Abstract] Net Cash Provided by (Used in) Financing Activities [Abstract] Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Income (loss) from limited partnership investment Net investment income Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities Investing activities Investing activities [Abstract] Net Cash Provided by (Used in) Investing Activities [Abstract] Operating activities Net cash provided by operating activities Net cash provided by operating activities Net income (loss) Net income (loss) Net income (loss) Net income (loss) Recently Issued Accounting Pronouncements New Accounting Pronouncements or Change in Accounting Principle [Line Items] Recently Issued Accounting Pronouncements [Abstract] New Accounting Pronouncements or Change in Accounting Principle [Table] Number of reportable segments 2019 Operating Leases, Future Minimum Payments Due, Next Twelve Months Total minimum payments required Operating Leases, Future Minimum Payments Due Future lease payments for operating leases with initial or remaining noncancelable term of one year or more [Abstract] Lease expense Lease liability Right-of-use asset Operating expenses of non-insurance companies 2021 Operating Leases, Future Minimum Payments, Due in Three Years 2020 Operating Leases, Future Minimum Payments, Due in Two Years Summary of Significant Accounting Policies Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Other Short-duration Insurance Lines [Member] Other Short-duration Insurance Product Line [Member] Pre-tax gains (losses) on debt and equity securities included in net income (loss) during period Less: applicable federal income tax expense (benefit) Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Less: reclassification adjustment for net gains (losses) included in net income (loss) Other comprehensive income (loss), reclassification adjustment for sale of securities included in net income, net of tax Less: reclassification adjustment for net gains (losses) included in net income (loss) Pre-tax holding gains (losses) on debt and equity securities arising during period Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax Less: applicable federal income tax expense (benefit) Adjustments for other-than-temporary impairment [Roll Forward] Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] Recovery of prior writedowns upon sale or disposal Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold Writedowns based on objective and subjective criteria Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment Cumulative charges to income at end of year Cumulative charges to income at beginning of year Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held Net pre-tax realized gain Other than Temporary Impairment, Credit Losses Recognized in Earnings, Period Increase (Decrease) Other-than-temporary impairments Other than Temporary Impairment Losses, Investments, Available-for-sale Securities Other assets Unrealized net gains (losses) on fixed income securities: Investments [Abstract] Unrealized net gains (losses) on fixed income securities: 401(k) Employee Savings and Profit Sharing Plan [Member] Other comprehensive income (loss), net of tax: Changes in net unrealized gains (losses) on investments [Abstract] Other comprehensive income (loss), net of tax [Abstract] Foreign exchange adjustment [Abstract] Investments [Abstract] Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax [Abstract] Total other operating expenses Other operating expenses Other Unrealized net gains (losses) arising during the period Net unrealized gains (losses) on investments Other liabilities Other Other Operating Income Other underwriting expenses Short-term and other Change in unrealized gains (losses) on investments Change in unrealized gain (loss) on investments, net of tax Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Foreign currency translation adjustments Foreign currency translation adjustment, net of tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Net increase (decrease) in partners' capital resulting from operations Purchases of investments Payments to Acquire Long-term Investments Repurchase of common shares amount paid Repurchase of common shares Payments for Repurchase of Common Stock Net sales of short-term investments Payments for (Proceeds from) Short-term Investments Total paid Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid Purchase of insurance company-owned life insurance Payment to Acquire Life Insurance Policy, Investing Activities Dividends paid to shareholders Dividends paid to shareholders Payments of Ordinary Dividends, Common Stock Cash purchase price Payments to Acquire Businesses, Gross Purchase of commercial mortgage loans Payments to Acquire Mortgage-backed Securities (MBS), Available-for-sale Purchases of property and equipment Net purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Purchases of fixed maturities and equity securities Payments to Acquire Marketable Securities Purchases of limited partnership interests Payments to Acquire Limited Partnership Interests Performance Based Equity Award [Member] Performance Shares [Member] Plan Name [Axis] Plan Name [Domain] Losses and loss expenses incurred Portion at Fair Value Measurement [Member] Account receivable, allowance Net direct Premiums Earned, Net, Other Insurance Net direct Premiums Written, Net Premiums Written [Abstract] Net premiums earned Net Net premiums earned % of amount assumed to net SEC Schedule, 12-17, Insurance Companies, Reinsurance, Premium, Percentage Assumed to Net Prepaid reinsurance premiums Sales or maturities of investments Proceeds from maturities Proceeds from sales of equity securities Proceeds from Sale of Available-for-sale Securities, Equity Proceeds from disposals of property and equipment Proceeds from sales of fixed maturities Proceeds from Sale of Debt Securities, Available-for-sale Distributions from limited partnerships Professional Liability Assumed [Member] Professional Liability Reinsurance Assumed [Member] Property and Casualty, Personal Insurance Product Line [Member] Physical Damage [Member] Commercial Liability [Member] Property and Casualty, Commercial Insurance Product Line [Member] Property and Casualty Insurance [Member] Property, Liability and Casualty Insurance Product Line [Member] Property/Casualty Insurance [Member] Property and Equipment Property and equipment--less accumulated depreciation (2018, $19,531; 2017, $16,614) Quarterly Results of Operations (Unaudited) Quarterly Financial Information [Text Block] Quarterly Results of Operations (Unaudited) [Abstract] Net worth and maximum consolidated leverage ratio Ratio of Indebtedness to Net Capital Realized Gains (Losses) on Investments Realized Gain (Loss) on Investments [Table Text Block] Segment Revenues Revenues [Abstract] Segment Reconciliation [Abstract] Reconciliation of Revenue from Segments to Consolidated [Table] Reinsurance [Abstract] Reinsurance payable Reinsurance recoverable Reinsurance recoverable Reinsurance recoverable on unpaid losses Reinsurance Recoverable for Unpaid Claims and Claims Adjustments Incurred but not reported unpaid losses and loss expenses Premiums Earned [Abstract] Components of reinsurance recoverable [Abstract] Reinsurance Reinsurance [Text Block] Net losses and loss expenses incurred reduced by ceded reinsurance recoveries Policyholder Benefits and Claims Incurred, Ceded Reinsurance Reinsurance ceded credits Policyholder Benefits and Claims Incurred, Assumed and Ceded Net losses and loss (benefit) expense incurred from reinsurance assumed from non-affiliates Related Parties [Abstract] Related Party Transaction [Line Items] Related Party Transaction [Domain] Estimated aggregate value of investment in limited partnerships Related Party Transaction, Amounts of Transaction Related Party [Domain] Related Party [Axis] Management fees and commissions Related Parties Related Party Transaction [Axis] Restricted [Member] Restricted Stock Units (RSUs) [Member] Restricted cash and cash equivalents Restricted cash Retained earnings Retained Earnings (Accumulated Deficit) Retained Earnings [Member] Retirement Plan Type [Axis] Retirement Plan Type [Domain] Recognition of Revenue and Costs Revenue: Revenue [Abstract] Revenues [Abstract] Total revenues Revenues Concentrations of Credit Risk [Abstract] Year Seven Accident Year 2015 [Member] Total of incurred-but-not-reported liabilities plus expected development on reported claims Supplementary Information about Average Historical Claims Duration Short-duration Insurance Contracts, Schedule of Historical Claims Duration [Table Text Block] Outstanding liabilities prior to 2009 net of reinsurance Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented Year Ten Short-duration Insurance Contracts, Historical Claims Duration, Year Ten Year Eight Short-duration Insurance Contracts, Historical Claims Duration, Year Eight Accident Year 2016 [Member] Incurred Claims Development, Net of Reinsurance [Abstract] Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract] Year Five Short-duration Insurance Contracts, Historical Claims Duration, Year Five Accident Year 2014 [Member] Incurred Claims Development Net of Reinsurance Short-duration Insurance Contracts, Claims Development [Table Text Block] Short-duration Insurance Contracts, Claims Development [Table] Accident Year 2012 [Member] Short-duration Insurance Contracts, Historical Claims Duration [Table] Accident Year 2010 [Member] Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] Reconciliation of Net Incurred and Paid Claims Development Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Table Text Block] Year Nine Short-duration Insurance Contracts, Historical Claims Duration, Year Nine Year Four Short-duration Insurance Contracts, Historical Claims Duration, Year Four Incurred claims and allocated claim adjustment expenses, net of reinsurance Accident Year 2009 [Member] Accident Year 2011 [Member] Number of reported claims per year Short-duration Insurance Contract, Cumulative Number of Reported Claims Short-duration Insurance Contracts, Accident Year [Domain] Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance Liabilities for claims and claims adjustment expenses, net of reinsurance Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net Short-duration Insurance Contracts, Historical Claims Duration [Line Items] Year Three Short-duration Insurance Contracts, Historical Claims Duration, Year Three Accident Year 2013 [Member] Year Two Short-duration Insurance Contracts, Accident Year [Axis] Unallocated claims adjustment expenses Short-duration Insurance Contracts, Liability for Unpaid Claims and Claims Adjustment Expense, Accumulated Unallocated Claim Adjustment Expense Year One Short-duration Insurance Contracts, Historical Claims Duration, Year One Cumulative paid claims and allocated claim adjustment expense, net of reinsurance Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Table] Year Six Short-duration Insurance Contracts, Historical Claims Duration, Year Six Short-term borrowings Short-term Debt, Fair Value Salary and related items Salvage and Subrogation Recoveries [Abstract] Estimated salvage and subrogation recoverable Plan [Member] Scenario, Unspecified [Domain] Quarterly Results of Operations Summary of Difference between Federal Income Taxes Expense Computed at Statutory Rate Fixed Maturity and Equity Security Investments in Unrealized Loss Position Schedule of Unrealized Loss on Investments [Table Text Block] Realized Gains (Loss) Future Lease Payments for Operating Leases with Initial or Remaining Noncancelable Terms of One Year or More Fair Value Measurements by Level for Assets Measured at Fair Value on Recurring Basis Reconciliation of the Denominators used in the Calculation of Basic and Diluted Earnings (Loss) per Share Schedule of Weighted Average Number of Shares [Table Text Block] Debt Securities, Available-for-sale [Line Items] Details of Changes in Net Unrealized Gains (Losses) on Investments Reconciliation of Components of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Federal Income Tax Expense (Benefit) Significant Components of Deferred Tax Assets and Liabilities Impact of Reinsurance Ceded and Assumed on the Company's Net Premium Written and Earned Ceded Credit Risk [Table Text Block] Schedule of Available-for-Sale Securities [Table] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Business Acquisitions, by Acquisition [Table] Investment Income [Table] Activity in Reserves for Losses and Loss Expenses Net Investment Income [Line Items] Schedule of Related Party Transactions, by Related Party [Table] Details of Other Operating Expenses Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Segment Information Segment Reporting Disclosure [Text Block] Segment Information [Abstract] Segment [Domain] Segment Reporting, Revenue Reconciling Item [Line Items] Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Share-based Compensation [Abstract] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Compensation expense related to restricted stock Stock based compensation expense Number of shares issued (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Number of shares vested (in shares) Grant date fair value per share (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Restricted Stock Shares awarded (in shares) Equity Award [Domain] Beginning balance (in shares) Ending balance (in shares) Shares, Outstanding Short-term borrowings Short-term Short-term Investments Accident Year 2018 [Member] Short-term [Member] Accident Year 2017 [Member] Scenario [Axis] Consolidated Balance Sheets [Abstract] Condensed Balance Sheet [Abstract] Consolidated Statements of Comprehensive Income (Loss) [Abstract] Condensed Statements of Comprehensive Income [Abstract] Class of Stock [Axis] Segments [Axis] Segments [Axis] Statement [Line Items] Statement [Table] Consolidated Statements of Cash Flows [Abstract] Condensed Statements of Cash Flows [Abstract] Equity Components [Axis] Consolidated Statements of Shareholders' Equity [Abstract] Net income of the insurance subsidiaries in accordance with statutory accounting practices Minimum statutory surplus necessary for the insurance subsidiaries to satisfy statutory risk based capital requirements Consolidated statutory capital and surplus exceeded requirement Statutory Accounting Practices, Permitted Practice, Amount Amount of statutory surplus transferred by dividend or loan to the parent company Consolidated statutory capital and surplus for subsidiaries Statutory Accounting Practices, Statutory Capital and Surplus, Balance Restricted stock grants (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross Stock repurchase program, authorized amount Number of outstanding shares eligible for repurchase (in shares) Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased Stock repurchase program, shares authorized (in shares) Repurchase of common stock Stock Repurchased During Period, Value Repurchase of common stock (in shares) Repurchase of common stock (in shares) Restricted stock grants Shareholders' Equity Stockholders' Equity Note Disclosure [Text Block] Ending balance Beginning balance Shareholders' equity Stockholders' Equity Attributable to Parent Shareholders' equity: Shareholders' equity [Abstract] Shareholders' Equity [Abstract] Subsequent Event [Table] Subsequent Event Type [Domain] Subsequent Event [Line Items] Subsequent Events [Abstract] Subsequent Event Type [Axis] Subsequent Events Subsequent Event [Member] Estimated ownership interest in significant limited partnership investment Amount at which shown in the balance sheet SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties, Amount Fixed maturities, amortized cost Cost SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties, Cost Fair value SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties, Fair Value Claims occurring during the current year Claims and claim adjustment expenses incurred related to current year Net premiums written SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters, Premium Written Supplemental Disclosures of Cash Flow Information Discount if any deducted in Column C Earned premiums SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters, Earned Premium Amortization of deferred policy acquisition costs SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters, Amortization of Deferred Policy Acquisition Cost Paid claims and claim adjustment expenses Unearned premiums SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters, Unearned Premium Net investment income SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters, Net Investment Income Reserves for unpaid claims and claim adjustment expenses SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters, Reserve for Unpaid Claim and Claim Adjustment Expense Deferred policy acquisition costs SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters, Deferred Policy Acquisition Cost Claims occurring during prior years Claims and claim adjustment expenses incurred related to prior years Net premium earned SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Premium Revenue Net investment income SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Net Investment Income Other policy claims and benefits payable SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Other Policy Claim and Benefit Payable Reserves for unpaid claims and claim adjustment expenses SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Liability for Future Policy Benefit, Loss, Claim and Loss Expense Net premiums written SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Premium Written Deferred policy acquisition costs SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Deferred Policy Acquisition Cost Other operating expenses SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Other Operating Expense Amortization of deferred policy acquisition costs SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Amortization of Deferred Policy Acquisition Cost Benefits, claims, losses and settlement expenses SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Benefit, Claim, Loss and Settlement Expenses Unearned premiums SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Unearned Premium Time certificate of deposit included in short-term investments Relationship to Entity [Domain] Title of Individual [Axis] Market value of equity and fixed maturity securities portfolio Debt Securities, Trading, and Equity Securities, FV-NI Total fixed income securities Fixed income securities (Amortized cost: 2018, $600,504; 2017, $521,017) Fixed income securities Financial Instruments [Domain] Average share price (in dollars per share) Type of Adoption [Domain] Unearned premiums Net unrealized loss position of diversified portfolio Net unrealized gains (losses) on equity securities and limited partnership investments Uncertain tax positions Accrued interest Use of Estimates Agency Collateralized Mortgage Obligations [Member] US Government Agencies Debt Securities [Member] Municipal Obligations [Member] US States and Political Subdivisions Debt Securities [Member] U.S. Government Obligations [Member] US Treasury and Government [Member] Average shares outstanding for basic earnings (loss) per share (in shares) Weighted Average Number of Shares Outstanding, Basic Dilutive effect of share equivalents (in shares) Average shares outstanding for diluted earnings (loss) per share (in shares) Weighted Average Number of Shares Outstanding, Diluted Reconciliation of the denominators used in the calculation of basic and diluted earnings (loss) per share [Abstract] SCHEDULE II CONDENSED FINANCIAL INFORMATION OF REGISTRANT [Abstract] Condensed Financial Statements, Captions [Line Items] Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Property/Casualty [Member] Maximum [Member] Minimum [Member] Ownership [Domain] Ownership [Axis] Products and Services [Domain] Baldwin & Lyons, Inc. [Member] Parent Company [Member] Products and Services [Axis] Property, Casualty Insurance Underwriters, Affiliation with Registrant [Domain] Range [Domain] Range [Axis] Schedule of Condensed Financial Statements [Table] SCHEDULE VI--SUPPLEMENTAL INFORMATION CONCERNING PROPERTY/CASUALTY INSURANCE OPERATIONS SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Text Block] Summary of Investments, Other than Investments in Related Parties [Table] SCHEDULE I -- SUMMARY OF INVESTMENTS-OTHER THAN INVESTMENTS IN RELATED PARTIES SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Text Block] SCHEDULE I -- SUMMARY OF INVESTMENTS-OTHER THAN INVESTMENTS IN RELATED PARTIES [Abstract] Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] Supplemental Information for Property, Casualty Insurance Underwriters [Table] SCHEDULE IV -- REINSURANCE [Abstract] SCHEDULE VI--SUPPLEMENTAL INFORMATION CONCERNING PROPERTY/CASUALTY INSURANCE OPERATIONS [Abstract] Affiliation with Registrant [Axis] SCHEDULE IV -- REINSURANCE SEC Schedule, 12-17, Insurance Companies, Reinsurance [Text Block] Supplemental Information for Property, Casualty Insurance Underwriters [Line Items] SCHEDULE III -- SUPPLEMENTARY INSURANCE INFORMATION [Abstract] Supplementary Insurance Information, by Segment [Line Items] Supplementary Insurance Information, by Segment [Table] SCHEDULE III -- SUPPLEMENTARY INSURANCE INFORMATION SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Disclosure [Text Block] Percentage of fixed maturity investments to total invested assets. Percentage of fixed maturity investment invested assets Percentage of fixed income investment to total invested assets The amount of the limited partners' expenses during the period. Limited Partnership, Expenses Partnership expenses Fair value of regulatory deposits with state regulatory authorities in connection with capital requirements. Regulatory deposits, fair value Regulatory deposits with various insurance departments in United States and Canada, fair value This element investment income (loss) net of expenses of a limited partnership during the period. Limited Partnership, Investment Gains (Loss), Net Net investment income (loss) Fixed income investments which were orginally issued with gurantees by third-party insurance company. Number of Fixed Income Investments Issued with Guarantees Number of fixed income investments issued with guarantees This element represents percentage of fixed maturities invested in investment grade fixed maturity. Percentage of fixed maturities invested in investment grade fixed maturity (in hundredths) Percentage of fixed income securities invested in investment grade fixed income Number of significant investments in public and private equity market. Number of significant investments in public and private equity markets in India Number of significant investments in public and private equity markets in India The commitment amount of additional contribution to various limited partnership. Commitment to make additional contributions to various limited partnerships Commitment to make additional contributions to various limited partnerships This element represents investment income (loss) from a limited partnership during the period. Limited Partnership, Investment Income (Loss) Investment income (loss) The net realized gains or losses on investments in limited partnerships during the period. Limited Partnership, Realized Investment Gains (Losses) Realized gain (loss) on investments Summarized financial information of significant limited partnership investments [Abstract] Number of investments in diversified portfolio. Number of investments in diversified portfolio including catastrophe bonds fixed maturity investments consists of bonds rated as less than investment grade at year end. Fixed Maturity Investment Below Investment Grade Fixed income investment below investment grade Refers to a limited partnership investment in private equity markets in India. Limited Partnership Investment, Private Equity Market, India [Member] Limited Partnership Investment, India [Member] A limited partnership investment in public equity and fixed income markets. Limited Partnership Investment [Member] Limited Partnership Investment, Public Equity and Fixed Markets [Member] Gross losses on available-for-sale investments sold during the period [Abstract] Gross losses on available-for-sale investments sold during the period [Abstract] Gross gains on available-for-sale investments sold during the period [Abstract] Gross gains on available-for-sale investments sold during the period [Abstract] Amount of realized gain (loss) from a change in the value of investments in limited partnerships. Investments in Limited Partnership, Realized Gain Loss Change in value of limited partnership investments Components of net realized and unrealized gains (losses) on investments [Abstract] Components of net realized and unrealized gains (losses) on investments [Abstract] Fund that invests in short-term money-market instruments and investments which are not otherwise included in another category or item that the entity has the intent to sell or dispose of within one year from the date of the balance sheet. Money Market Funds, Short term and Other [Member] Money Market Funds, Short term and Other [Member] This item represents percentage of fair value of debt securities, categorized neither as held-to-maturity nor trading securities, which do not have a single maturity date. Available For Sale Securities Debt Maturities Without Single Maturity Date, Total Fair Value, percentage Total contractual maturities, Fair Value This item represents the amortized cost of debt securities, categorized neither as held-to-maturity nor trading securities, which do not have a single maturity date. Available For Sale Securities Debt Maturities Without Single Maturity Date, Amortized Cost, Percentage Total contractual maturities, Cost or Amortized Cost Percentage of available-for-sale debt securities at cost, net of adjustments, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. Available for sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis, percentage Excess of one year to five years, Cost or Amortized Cost Percentage of available-for-sale debt securities at fair value maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Available for sale Securities, Debt Maturities, Year Six Through Ten, Fair Value, percentage Excess of five years to ten years, Fair Value Percentage of debt securities categorized neither as held-to-maturity nor trading which are intended be sold or mature within one year from the balance sheet date or the normal operating cycle, whichever is longer. Available for sale Securities, Debt Maturities, without Single Maturity Date, Fair Value, percentage Asset-backed securities, Fair Value Percentage of available-for-sale debt securities at cost, net of adjustments, maturing after the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. Available for sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis, Percentage Excess of ten years, Cost or Amortized Cost Percentage of available-for-sale debt securities at cost, net of adjustments, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. Available for sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis, Percentage Excess of five years to ten years, Cost or Amortized Cost Percentage of available-for-sale debt securities at cost, net of adjustments, which include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. Available for sale Securities, Debt Maturities, Amortized Cost Basis, Percentage Cost or amortized cost Percentage of available-for-sale debt securities at cost, net of adjustments, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. Available for sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis, percentage One year or less, Cost or Amortized Cost Percentage of available-for-sale debt securities at cost, net of adjustments, that do not have a single maturity date and which the entity has decided to disclose separately rather than allocating the cost over several maturity groupings. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. Available for sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis, Percentage Asset-backed securities, Cost or Amortized Cost Percentage of Available for sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] Percentage of amount of available-for-sale debt securities at fair value maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Available for sale Securities, Debt Maturities, Year Two Through Five, Fair Value, percentage Excess of one year to five years, Fair Value Percentage of debt securities categorized neither as held-to-maturity nor trading which are intended be sold or mature within one year from the balance sheet date or the normal operating cycle, whichever is longer. Available for sale Securities, Debt Securities, Percentage