Supplementary Insurance Information [Abstract] Property and Liability Insurance Earned Premiums Schedule of Supplemental Information for Property, Casualty Insurance Underwriters [Text Block] Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Fair Value Measurement [Table] Fair Value Measurement [Table] Fair Value Measurement [Table] Fair Value, Option, Quantitative Disclosures, by Eligible Item or Group [Axis] Eligible Item or Group for Fair Value Option [Axis] Fair Value, Option, Eligible Item or Group [Domain] Fair Value, Option, Eligible Item or Group [Domain] Fixed Maturity Securities [Member] Fixed Income Securities [Member] Equity Securities [Member] Equity Securities [Member] Fair Value, Qualitative Disclosures Related to Election, by Eligible Item or Group [Axis] Fair Value, Qualitative Disclosures Related to Election, by Eligible Item or Group [Axis] Fair Value, Qualitative Disclosures Related to Election, by Eligible Item or Group [Axis] Fair Value, Qualitative Disclosures Related to Election, by Eligible Item or Group [Domain] Fair Value, Qualitative Disclosures Related to Election, by Eligible Item or Group [Domain] Fair Value, Qualitative Disclosures Related to Election, by Eligible Item or Group [Domain] U.S. government bonds and agencies [Member] US Government Agencies Debt Securities [Member] Municipal securities [Member] Municipal Bonds [Member] Mortgage-backed securities [Member] Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Corporate Securities [Member] Corporate Debt Securities [Member] Collateralized debt obligations [Member] Collateralized Debt Obligations [Member] Public utilities [Member] Public Utility, Equities [Member] Banks, trusts and insurance companies [Member] Banks, Trust and Insurance, Equities [Member] Energy and other [Member] Industrial, Miscellaneous, and All Others [Member] Non-redeemable preferred stock [Member] Nonredeemable Preferred Stock [Member] Partnership interest in a private credit fund [Member] Partnership Interest In Private Credit Fund [Member] Partnership Interest In A Private Credit Fund [Member]. Short-term bonds [Member] Short-term Investments [Member] Money market instruments [Member] Money Market Funds [Member] Equity contracts [Member] Equity Contract [Member] Interest rate swap agreements [Member] Interest Rate Swap [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value, Measurements, Fair Value Hierarchy [Domain] Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Fair Value Measurement [Line Items] Fair Value Measurement [Line Items] Fair Value Measurement [Line Items] Assets Fair Value Assets Measured On Recurring Basis This element represents a certain statement of financial position asset caption which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. Liabilities Fair Value Liabilities Measured On Recurring Basis This element represents liabilities, including [financial] instruments that are classified in stockholders' equity, which are measured at fair value on a recurring basis. Subsequent Events [Abstract] Subsequent Events Subsequent Events [Text Block] Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Valuation Techniques Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table Text Block] Summary Of Changes In Fair Value Of Level 3 Financial Assets And Financial Liabilities Held At Fair Value Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Investments [Abstract] Fixed maturity securities: Marketable Securities, Fixed Maturities [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 ten 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 ten years Trading Securities Debt Maturities After Ten Years Fair Value Trading securities debt maturities after ten years fair value. Total Investments, Fair Value Disclosure Percentage of fixed maturities Percentage of fixed maturity securities Percentage of fixed maturities rated below investment grade and non-rated. Goodwill and Intangible Assets Disclosure [Abstract] Intangible assets amortization expense Amortization of Intangible Assets Accounting Policies [Abstract] Three-year performance period ending December 31, Performance Vesting Restricted Stock Units, Three-Year Performance Period Ending, Years Performance vesting restricted stock units, three-year performance period ending, years. Vesting shares, target (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vesting shares, maximum (in shares) Performance Vesting Restricted Stock Units, Vesting Shares, Maximum Performance vesting restricted stock units, vesting shares, maximum. Restricted stock granted (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Deferred Compensation Arrangements [Abstract] Maximum percentage of compensation employee is allowed to contribute Maximum Percentage of Compensation Employee is Allowed to Contribute Maximum percentage of compensation employee is allowed to contribute to the Plan. Matching contributions Deferred Compensation Arrangement with Individual, Employer Contribution Value of shares authorized to repurchase for ESOP allocation Employee Stock Ownership Plan (ESOP), Repurchase Obligation Amount Condensed Financial Information of Parent Company Only Disclosure [Abstract] Schedule of Condensed Balance Sheet Schedule of Condensed Balance Sheet [Table Text Block] Schedule of Condensed Income Statement Schedule of Condensed Income Statement [Table Text Block] Schedule of Condensed Comprehensive Income Statement Schedule of Condensed Comprehensive Income Statement [Table Text Block] Schedule of Condensed Comprehensive Income Statement [Table Text Block] Schedule of Condensed Cash Flow Statement Schedule of Condensed Cash Flow Statement [Table Text Block] Components of Income Tax Expense (Benefit), Continuing Operations [Abstract] Reconciliation of Unrecognized Tax Benefits [Roll Forward] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Balance at January 1 Unrecognized Tax Benefits Additions based on tax positions related to the current year Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions Additions based on tax positions related to prior years Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions Reductions for tax positions of prior years Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions Reductions as a result of a lapse of the applicable statute of limitations Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations Balance at December 31 Commitments and Contingencies Disclosure [Abstract] Deferred rent Deferred Rent Credit Total rent expense Operating Leases, Rent Expense, Net Exposure to earthquake loss Loss from Catastrophes Number of instances of non-compliance issued from regulatory body Number of Instances of Non-Compliance Issued from Regulatory Body Number of Instances of Non-Compliance Issued from Regulatory Body Settlement of fine and penalty levied by California DOI Loss Contingency, Settlement Agreement, Consideration Consolidation and Basis of Presentation Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Investments Investment, Policy [Policy Text Block] Fair Value Of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Deferred Policy Acquisition Costs Deferred Charges, Policy [Policy Text Block] Fixed Assets Property, Plant and Equipment, Policy [Policy Text Block] Goodwill And Other Intangible Assets Goodwill and Intangible Assets, Policy [Policy Text Block] Premium Revenue Recognition Revenue Recognition, Premiums Earned, Policy [Policy Text Block] Losses And Loss Adjustment Expenses Losses And Loss Adjustment Expenses [Policy Text Block] Disclosure of accounting policies for losses and loss adjustment expenses. Derivative Financial Instruments Derivatives, Policy [Policy Text Block] Earnings per Share Earnings Per Share, Policy [Policy Text Block] Segment Reporting Segment Reporting, Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Reinsurance Reinsurance Accounting Policy [Policy Text Block] Share-Based Compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Dividends [Abstract] Dividends Dividends And Statutory Restrictions [Table Text Block] This includes a summary of shareholder dividends paid in total and per share. Further, this includes disclosures relating to statutory restrictions on the payment of dividends as prescribed by state regulatory authorities. Notes Payable [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] AIS [Member] Ais [Member] AIS [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Bank Of America [Member] Bank Of America [Member] Bank Of America [Member] Union Bank [Member] Union Bank [Member] Union Bank [Member] Senior Notes [Member] Senior Notes [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Loan maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Advance rate used to calculate collateral requirement Advance Rate Used To Calculate Collateral Requirement Advance rate used to calculate collateral requirement. Credit facility maturity date range, start Debt Instrument, Maturity Date Range, Start Credit facility maturity date range, end Debt Instrument, Maturity Date Range, End Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Loan expiration date Line of Credit Facility, Expiration Date Senior notes retired Repayments of Unsecured Debt Unsecured senior notes interest rate Debt Instrument, Interest Rate, Stated Percentage Notes maturity date Debt Instrument, Maturity Date Note payable at maturity date Notes Payable 2013 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 2014 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2015 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2016 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2017 Finite-Lived Intangible Assets, Amortization Expense, Year Five Thereafter Finite-Lived Intangible Assets, Amortization Expense, after Year Five Net Carrying Amount Finite-Lived Intangible Assets, Net Quarterly Financial Data [Abstract] Summary Of Quarterly Financial Data Schedule of Quarterly Financial Information [Table Text Block] Share-based Compensation [Abstract] Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table] Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table] Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Axis] Exercise Price Range [Axis] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain] $33.61-40.53 [Member] Exercise Price Range From Thirty Three Point Six One To Forty Point Five Three [Member] Exercise Price Range From Thirty Three Point Six One To Forty Point Five Three [Member] $47.61-51.51 [Member] Exercise Price Range From Forty Seven Point Six One To Fifty One Point Five One [Member] Exercise Price Range From Forty Seven Point Six One To Fifty One Point Five One [Member] $52.13-58.83 [Member] Exercise Price Range From Fifty Two Point One Three To Fifty Eight Point Eight Three [Member] Exercise Price Range From Fifty Two Point One Three To Fifty Eight Point Eight Three [Member] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] Range of Exercise Prices, lower limit (in dollars per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit Range of Exercise Prices, upper limit (in dollars per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit Options Outstanding, Number of Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Options Outstanding, Weighted-Avg. Remaining Contractual Life (Years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Options Outstanding, Weighted-Avg. Exercise Price (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Options Exercisable, Number of Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Options Exercisable, Weighted-Avg. Exercise Price (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Summary of Stock Option Activity Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of Options Authorized under Stock Option Plans, by Exercise Price Range Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] Summary of Vested And Unvested RSU Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] Schedule of Investments [Table] Schedule of Investments [Table] Debt Security [Axis] Debt Security [Axis] Major Types of Debt Securities [Domain] Major Types of Debt Securities [Domain] Short-Term Investments [Member] Option [Member] Option And Short Sale Transactions [Member] Option And Short Sale Transactions [Member] Investments [Line Items] Schedule of Investments [Line Items] Net realized investment gains (losses) Realized Investment Gains (Losses) Property, Plant and Equipment [Abstract] Fixed Assets Property, Plant and Equipment Disclosure [Text Block] Income Taxes Income Tax Disclosure [Text Block] Insurance Loss Reserves [Abstract] Activity In The Reserves For Losses And Loss Adjustment Expenses Liability for Unpaid Claims Adjustment Expense by Expense Type [Table Text Block] Risks and Uncertainties [Abstract] Risks and Uncertainties Risks And Uncertainties [Text Block] Risks And Uncertainties [Text Block] Schedule Of Components Of Other Intangible Assets Schedule of Intangible Assets and Goodwill [Table Text Block] Schedule Of Estimated Future Amortization Expense Related To Intangible Assets Schedule of Expected Amortization Expense [Table Text Block] Statutory Balances And Accounting Practices [Abstract] Statutory Balances And Accounting Practices [Abstract] Statutory Balances and Accounting Practices Statutory Accounting Practices Disclosure [Table Text Block] Gross Realized Gains Trading Securities, Realized Gain Gross Realized Losses Trading Securities, Realized Loss Net Trading Securities, Realized Gain (Loss) Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] Commercial Mortgage Backed Securities [Member] Commercial Mortgage Backed Securities [Member] Percentage of portfolio of unadjusted fair values obtained Percentage Of Unadjusted Fair Value Obtained Percentage of unadjusted fair value obtained Percentage of portfolio of specific unadjusted broker quotes obtained Percentage of specific unadjusted broker quotes obtained Percentage of specific unadjusted broker quotes obtained Number of knowledgeable outside security brokers consulted to determine fair value Number of knowledgeable outside security brokers consulted to determine fair value Number of knowledgeable outside security brokers consulted to determine fair value. Trading securities, fair value disclosure Trading Securities, Fair Value Disclosure Components Of Income Tax Expense Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Reconciliation Of Income Taxes Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Deferred Tax Assets And Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Summary Of Unrecognized Tax Benefits Summary of Income Tax Contingencies [Table Text Block] Summary of Investments, Other than Investments in Related Parties [Abstract] Summary Of Investments Other Than Investments In Related Parties Summary of Investments, Other than Investments in Related Parties [Text Block] Statement of Other Comprehensive Income [Abstract] Net income Net Income (Loss) Attributable to Parent Other comprehensive income (loss), before tax: Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent [Abstract] Gains (losses) on hedging instrument Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax Other comprehensive income (loss), before tax Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent Income tax expense (benefit) related to gains (losses) on hedging instrument Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Other comprehensive income (loss), net of tax: Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Schedule Of Statutory Net Income And Capital And Surplus Schedule Of Statutory Net Income And Capital And Surplus [Table Text Block] Schedule Of Statutory Net Income And Capital And Surplus [Table Text Block]. Fair Value Measurement Fair Value, Measurement Inputs, Disclosure [Text Block] Schedule of Condensed Financial Statements [Table] Schedule of Condensed Financial Statements [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Mcc [Member] Mcc [Member] MCC [Member] Condensed Financial Statements, Captions [Line Items] Condensed Financial Statements, Captions [Line Items] Dividends from subsidiaries Proceeds from dividends received from subsidiaries Proceeds from dividends received from subsidiaries. Capital contributions to subsidiaries Capital contributions to subsidiaries Capital contributions to subsidiaries. Credit facility amount Line of Credit Facility, Amount Outstanding Bank loan Loans Payable to Bank Municipal bonds, fair value Municipal Debt Securities, at Carrying Value Total borrowing guaranteed Secured Debt General Discussion of Derivative Instruments and Hedging Activities [Abstract] Derivative Financial Instruments [Table] Derivative Financial Instruments [Table] Derivative Financial Instruments [Table] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Non-hedging derivatives [Member] Not Designated as Hedging Instrument [Member] Derivative Instruments, Gain (Loss) by Derivative Instrument Risk [Axis] Derivative Instrument Risk [Axis] Derivative Contract Type [Domain] Derivative Contract Type [Domain] Derivatives, Fair Value, by Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Other liabilities [Member] Other Liabilities [Member] Derivative Financial Instruments [Line Items] Derivative Financial Instruments [Line Items] Derivative Financial Instruments [Line Items] Asset Derivatives Derivative Liability, Fair Value, Gross Asset Liability Derivatives Derivative Liability, Fair Value, Gross Liability Schedule of Fair Value, Off-balance Sheet Risks [Table] Schedule of Fair Value, Off-balance Sheet Risks [Table] Derivative Instrument Risk [Axis] Equity Contract [Member] Financial Instrument [Axis] Financial Instrument [Axis] Types of Financial Instruments [Domain] Types of Financial Instruments [Domain] Investments [Member] Investments [Member] Interest Rate Swap [Member] Secured Debt [Member] Secured Debt [Member] Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] Investments Investments Interest rate swap agreements, liabilities Derivative Financial Instruments, Liabilities, Fair Value Disclosure Equity contracts Equity Contracts Financial Instruments Liabilities Fair Value Disclosure Equity Contracts Financial Instruments Liabilities Fair Value Disclosure Financial instrument, fair value Debt Instrument, Fair Value Disclosure Subsequent Event [Table] Subsequent Event [Table] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [Member] Restructuring Type [Axis] Restructuring Type [Axis] Type of Restructuring [Domain] Type of Restructuring [Domain] Employee Severance [Member] Employee Severance [Member] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Scenario, Forecast [Member] Scenario, Forecast [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Workforce reduction, number of employees Restructuring and Related Cost, Number of Positions Eliminated Workforce reduction, number of employees eliminated as a percentage of total workforce (less than 3% as of January, 2013) Restructuring and Related Costs, Number of Positions Eliminated, Percentage of Total Workforce Restructuring and Related Costs, Number of Positions Eliminated, Percentage of Total Workforce Workforce reduction, expected office closure costs and severance related expense Restructuring and Related Cost, Expected Cost Earnings Per Share Reconciliation [Abstract] Earnings Per Share Earnings Per Share [Text Block] Schedule Of Fixed Assets Property, Plant and Equipment [Table Text Block] Fair Value Option [Abstract] Fair Value Option [Abstract] Schedule of Fair Value of Separate Accounts by Major Category of Investment [Table] Schedule of Fair Value of Separate Accounts by Major Category of Investment [Table] Schedule of Fair Value of Separate Accounts by Major Category of Investment [Axis] Schedule of Fair Value of Separate Accounts by Major Category of Investment [Axis] Schedule of Fair Value of Separate Accounts by Major Category of Investment, Category [Domain] Schedule of Fair Value of Separate Accounts by Major Category of Investment, Category [Domain] Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] Gains and losses due to changes in fair value of investments Fair Value, Option, Changes in Fair Value, Gain (Loss) Deferred Policy Acquisition Costs Disclosures [Abstract] Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] Balance, beginning of year Deferred Policy Acquisition Costs and Value of Business Acquired Policy acquisition costs deferred Deferred Policy Acquisition Costs and Present Value of Future Profits, Additions Amortization Deferred Policy Acquisition Costs and Present Value of Future Profits, Amortization Balance, end of year Direct amounts Supplemental Information for Property, Casualty Insurance Underwriters, Premiums Written Ceded to other companies Ceded Premiums Written, Property and Casualty Assumed Assumed Premiums Written, Property and Casualty Net amounts Supplemental Information for Property, Casualty Insurance Underwriters, Net Investment Income Deferred tax assets: Components of Deferred Tax Assets [Abstract] 20% of net unearned premium Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Unearned Premiums Reserve Capital loss carryforward Deferred Tax Assets, Capital Loss Carryforwards Discounting of loss reserves and salvage and subrogation recoverable for tax purposes Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Loss Reserves Write-down of impaired investments Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Impairment Losses Tax credit carryforward Tax Credit Carryforward, Deferred Tax Asset Expense accruals Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Reserves Other deferred tax assets Deferred Tax Assets, Other Total gross deferred tax assets Deferred Tax Assets, Gross Deferred tax liabilities: Components of Deferred Tax Liabilities [Abstract] Deferred acquisition costs Deferred Tax Liabilities, Acquisition Costs Deferred tax liabilities, acquisition costs. Tax liability on net unrealized gain on securities carried at fair value Deferred Tax Liabilities, Unrealized Gains on Trading Securities Tax depreciation in excess of book depreciation Deferred Tax Liabilities, Property, Plant and Equipment Undistributed earnings of insurance subsidiaries Deferred Tax Liabilities Undistributed Insurance Subsidiaries Deferred Tax Liabilities Undistributed Insurance Subsidiaries Tax amortization in excess of book amortization Deferred Tax Liabilities Tax Amortization In Excess Of Book Amortization Deferred Tax Liabilities Tax Amortization In Excess Of Book Amortization. Other deferred tax liabilities Deferred Tax Liabilities, Other Total gross deferred tax liabilities Deferred Tax Liabilities, Net Net deferred tax (liabilities) assets Deferred Tax Assets, Net Schedule Of Deferred Policy Acquisition Costs Schedule Of Deferred Policy Acquisition Costs [Table Text Block] Schedule Of Deferred Policy Acquisition Costs [Table Text Block]. Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Statement of Financial Position [Abstract] Amortized cost on fixed maturities trading investments Amortized Cost On Fixed Maturity Trading Investments Amortized cost on fixed maturity trading investments Cost - equity security trading investments Cost Equity Security Trading Investments Cost - Equity Security Trading Investments Cost - short-term investments Cost Short Term Investments Cost of investments in short-term bonds and money market instruments. Common Stock Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] Common stock, no par value Common Stock, No Par Value Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Common Stock, Shares, Issued Common stock, shares outstanding Common Stock, Shares, Outstanding Future Minimum Commitments For Operating Leases Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] ASSETS Assets [Abstract] Fixed maturity securities (amortized cost $2,270,903; $2,345,620) Trading Securities, Debt Equity securities (cost $475,959; $388,417) Trading Securities, Equity Short-term investments (cost $294,607; $236,433) Short-term Investments Total investments Cash Cash Receivables: Premiums and Other Receivables, Net [Abstract] Premiums Premiums Receivable, at Carrying Value Accrued investment income Accrued Investment Income Receivable Other Other Receivables Total receivables Premiums and Other Receivables, Net Deferred policy acquisition costs Deferred Policy Acquisition Costs Fixed assets, net Property, Plant and Equipment, Net Current income taxes Income Taxes Receivable Deferred income taxes Deferred Tax Assets, Net of Valuation Allowance Goodwill Goodwill Other intangible assets, net Intangible Assets, Net (Excluding Goodwill) Other assets Other Assets Total assets Assets LIABILITIES AND SHAREHOLDERS’ EQUITY Liabilities and Equity [Abstract] Losses and loss adjustment expenses Liability for Claims and Claims Adjustment Expense, Property Casualty Liability Unearned premiums Unearned Premiums Notes payable Accounts payable and accrued expenses Accounts Payable and Accrued Liabilities Current income taxes Accrued Income Taxes, Current Deferred income taxes Deferred Tax Liabilities, Gross Other liabilities Other Liabilities Total liabilities Liabilities Commitments and contingencies Commitments and Contingencies Shareholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Common stock without par value or stated value: Authorized 70,000 shares; issued and outstanding 54,922; 54,856 Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital, Common Stock Retained earnings Retained Earnings (Accumulated Deficit) Total shareholders’ equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total liabilities and shareholders’ equity Liabilities and Equity Extraordinary Items [Table] Extraordinary Items [Table] Extraordinary Item [Axis] Extraordinary Item [Axis] Extraordinary Item, [Domain] Extraordinary Item [Domain] Catastrophe [Member] Catastrophe [Member] Extraordinary Item [Line Items] Extraordinary Item [Line Items] Increase in provision for insured events of prior years in 2012 Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims, Prior Years Increase in provision for insured events Increase In Provision For Insured Events Increase In Provision For Insured Events. Decrease in provision for insured events Decrease in provision for insured events Decrease in provision for insured events. Unfavorable development Unfavorable development Unfavorable development on homeowners line of business. Pre-tax catastrophe losses Liability for Catastrophe Claims, Carrying Amount Parent Company [Member] Parent Company [Member] Share-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Dividends Paid In Total And Per Share Schedule Of Dividends Paid In Total And Per Share [Table Text Block] Schedule of dividends paid in total and per share [Table text block] Earnings Per Share [Table] Earnings Per Share [Table] Earnings Per Share [Table] Antidilutive Securities Excluded from Computation of Earnings Per Share, by Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Common Stock [Member] Common Stock [Member] Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Income available to common stockholders, Basic Net Income (Loss) Available to Common Stockholders, Basic Effect of dilutive securities: Options Dilutive Securities, Effect on Basic Earnings Per Share, Including Options and Restrictive Stock Units Income available to common stockholders after assumed conversions, Diluted Net Income (Loss) Available to Common Stockholders, Diluted Weighted Shares, Basic Weighted Average Number of Shares Outstanding, Basic Effect of dilutive securities: Options Incremental Common Shares Attributable to Share-based Payment Arrangements Weighted Shares, Diluted Weighted Average Number of Shares Outstanding, Diluted Per-Share Amount, Basic Earnings Per Share, Basic Per-Share Amount, Diluted Earnings Per Share, Diluted Potentially dilutive securities (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Deferred Policy Acquisition Costs Deferred Policy Acquisition Costs [Text Block] Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Other Comprehensive Income (Loss) [Member] Retained Earnings [Member] Retained Earnings [Member] Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning of year Exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Share-based compensation expense Share-based Compensation Tax benefit on sales of incentive stock options Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Operating Activities Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax Dividends paid to shareholders Dividends, Common Stock, Cash End of year Schedule of Finite-Lived Intangible Assets by Major Class [Table] Schedule of Finite-Lived Intangible Assets [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Customer relationships [Member] Customer Relationships [Member] Trade names [Member] Trade Names [Member] Technology [Member] Technology Equipment [Member] Favorable leases [Member] Off-Market Favorable Lease [Member] Software [Member] Computer Software, Intangible Asset [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Gross Carrying Amount Finite-Lived Intangible Assets, Gross Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Useful Lives (in years) Finite-Lived Intangible Asset, Useful Life Statutory Balances And Accounting Practices [Table] Statutory Balances And Accounting Practices [Table] Statutory Balances And Accounting Practices [Table] Dividend Declared [Member] Dividend Declared [Member] Statutory Balances And Accounting Practices [Line Items] Statutory Balances And Accounting Practices [Line Items] Statutory Balances And Accounting Practices [Line Items] Statutory net income Statutory Accounting Practices, Statutory Net Income Amount Statutory capital and surplus Statutory Accounting Practices, Statutory Capital and Surplus, Balance 2013 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2014 Operating Leases, Future Minimum Payments, Due in Two Years 2015 Operating Leases, Future Minimum Payments, Due in Three Years 2016 Operating Leases, Future Minimum Payments, Due in Four Years 2017 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Derivative Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Quarterly dividend declared (in dollars per share) Common Stock, Dividends, Per Share, Declared Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Statement, Business Segments [Axis] Business Segments [Axis] Segment [Domain] Segment [Domain] Private Passenger Automobile [Member] Private Passenger Automobile [Member] Private Passenger Automobile [Member] Homeowners [Member] Homeowners [Member] Homeowners [Member] Commercial Automobile [Member] Commercial Automobile [Member] Commercial Automobile [Member] Other Lines [Member] Other Lines [Member] Other Lines [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Annual direct premiums written Direct Premiums Written, Property and Casualty Profit Sharing Plan Schedule of Employee Stock Ownership Plan (ESOP) Disclosures [Table Text Block] Derivative Instruments, Gain (Loss) by Income Statement Location [Axis] Income Statement Location [Axis] Income Statement and Other Comprehensive Income Location [Domain] Income Statement Location [Domain] Other comprehensive income (loss) [Member] Other Comprehensive Income (Loss) [Member] Other revenue (expense) [Member] Other Income [Member] Net realized investment gains [Member] Net Realized Investment Gains [Member] Net Realized Investment Gains [Member] Derivative Instruments, Gain (Loss) by Hedging Relationship [Axis] Hedging Relationship [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Derivatives Contracts for Cash Flow Hedges [Member] Cash Flow Hedging [Member] Derivatives Not Designated as Hedging Instruments [Member] Gain (Loss) Recognized in Comprehensive Income Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net Gain (Loss) Recognized in Income Derivative Instruments, Gain (Loss) Recognized in Income, Net Credit Facility [Member] Credit Facility [Member] Credit Facility [Member] Loans [Member] Loans [Member] Derivative Financial Instruments [Line Items] Secured notes Fixed rate Derivative, Fixed Interest Rate Maturity date of senior notes Debt Instrument, Maturity Date, Description Loan maximum borrowing capacity Floating rate, LIBOR plus basis points (as a percentage) Loan mature date Fair market value of the interest rate swap Interest Rate Fair Value Hedge Asset at Fair Value Estimated Fair Value Of Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Direct Premium Attributable By Segment Schedule Direct Premiums Attributable To Segment [Table Text Block] Disclosure of direct premium written by line of business. 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Calls or maturities Equity securities: Marketable Securities, Equity Securities [Abstract] Purchases Cash flows from financing activities: Cash: Cash and Cash Equivalents [Abstract] Income taxes paid (received) Total paid Payments of Dividends Per share (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Maximum dividend payable without prior permission of DOI of states domicile Amount Available for Dividend Distribution without Prior Approval from Regulatory Agency Payments of ordinary dividends Payments of Ordinary Dividends Payments of extraordinary dividends Payments Of Extraordinary Dividends Payments of extraordinary dividends. Condensed Financial Information of Registrant Condensed Financial Information of Parent Company Only Disclosure [Text Block] Total investment income Net Investment Income Less: Investment expense Investment Income, Investment Expense Net investment income Summary of Investments, Other than Investments in Related Parties [Table] Summary of Investments, Other than Investments in Related Parties [Table] Common Stock Type [Axis] Common Stock Type [Axis] Common Stock Type [Axis] Common Stock Type [Domain] Common Stock Type [Domain] Common Stock Type [Domain] Public Utilities [Member] Public Utilities [Member] Public Utilities [Member] Banks, Trust, And Insurance Companies [Member] Banks Trust And Insurance Companies [Member] Banks, Trust, And Insurance Companies [Member] Energy and Other [Member] Energy And Other [Member] Energy And Other [Member] Schedule of Trading Securities and Other Trading Assets, Major Types of Trading Securities and Assets [Axis] Major Types of Trading Securities 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[Domain] Property, Plant and Equipment, Type [Domain] Building [Member] Building [Member] Furniture Equipment And Purchase Software [Member] Furniture Equipment And Purchase Software [Member] Furniture, Equipment And Purchase Software [Member] Software [Member] Software [Member] Options Granted Prior To 2008 [Member] Options Granted Prior To Two Thousand Eight [Member] Options Granted Prior to Two Thousand Eight [Member] Options Granted Subsequent To January 1, 2008 [Member] Options Granted Subsequent To January One Two Thousand Eight [Member] Options Granted Subsequent to January One, Two Thousand Eight [Member] Summary Of Significant Accounting Policies [Line Items] Summary Of Significant Accounting Policies [Line Items] Summary Of Significant Accounting Policies [Line Items] Number of insurance companies Number Of Subsidiaries Number of subsidiaries. Percentage of direct premiums written as private passenger automobile lines of insurance Percentage of direct premiums written as private passenger automobile lines of insurance Percentage of direct premiums written as private passenger automobile lines of insurance. Percentage of private passenger automobile premiums written in California Percentage of private passenger automobile premiums written in California Percentage of private passenger automobile premiums written in California. Percentage by which dividend income on non redeemable preferred stock, partnership, common stock is partially tax-sheltered Percentage By Which Dividend Income On Non Redeemable Preferred Stock, Partnership, Common Stock Is Partially Tax-Sheltered Percentage by which dividend income on non redeemable preferred stock, partnership, common stock is partially tax-sheltered Marketable securities, fixed maturities Marketable Securities, Fixed Maturities Marketable securities, equity securities Marketable Securities, Equity Securities Debt instrument, fair value Insurance companies security deposits Security Deposits By Insurance Companies Security Deposits by Insurance Companies Deferred policy acquisition cost amortization Advertising expenses Advertising Expense Useful life, in years Property, Plant and Equipment, Useful Life Impairment charges Asset Impairment Charges Goodwill impairment loss Goodwill, Impairment Loss Premiums written, net Premiums Written, Net Broker direct premiums percentage account Broker direct premiums percentage account Broker direct premiums percentage account Option vesting term, years Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block]