Unrealized gain (loss) on investments Unrealized Gain (Loss) on Investments Common stock, dividends, per share, cash paid Common Stock, Dividends, Per Share, Cash Paid Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Statistical Measurement [Domain] Statistical Measurement [Domain] Business Combination [Abstract] Business Combination [Abstract] Tradename FiniteAndIndefiniteLivedTradeNames Carrying amount as of the balance sheet date for the rights acquired through registration of a trade name to gain or protect exclusive use thereof for both a reasonably expected period of economic benefit and a projected indefinite period of benefit. The carrying amount of finite lived trade names is the gross amount before accumulated amortization as of the balance sheet date. The carrying amount of indefinite lived trade names is the original cost adjusted for previously recognized amortization and impairment as of the balance sheet date. Debt and Equity Securities, FV-NI [Line Items] Debt and Equity Securities, FV-NI [Line Items] Net realized investment gains (losses) Realized Investment Gains (Losses) Entity Listings, Exchange [Axis] Entity Listings, Exchange [Axis] Award Timing Predetermined Award Timing Predetermined [Flag] 2026 - Operating Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Asset Class [Axis] Asset Class [Axis] Entity File Number Entity File Number Tabular List, Table Tabular List [Table Text Block] Leases [Abstract] Leases [Abstract] Net income tax (benefit) expense on other comprehensive (loss) income Other Comprehensive Income (Loss), Tax New Accounting Pronouncements, Policy New Accounting Pronouncements, Policy [Policy Text Block] Purchases of short-term investments Payments to Acquire Short-Term Investments 2026 - Total LesseeLeaseLiabilityPaymentsRemainderOfFiscalYear Amount of lessee's undiscounted obligation for lease payment for operating and financing leases having initial or remaining lease term in excess of one year to be paid in remainder of current fiscal year. Total fixed maturities Debt Securities [Member] Debt securities, available-for-sale, accumulated gross unrealized loss, before tax Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Other Expenses Other Expenses Basic Earnings per Common Share Earnings Per Share, Basic Adjustment to Compensation: Adjustment to Compensation [Axis] Related Party Transactions Related Party Transactions Disclosure [Text Block] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Decrease in accounts payable and accrued liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Revenue Recognition Revenue from Contract with Customer [Text Block] Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax Selected Financial Information About The Company's Operations By Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Non-title services Non-Title Services [Member] Non-Title Services [Member] Estimated Fair Value Variable Interest Entity, Nonconsolidated, Fair Value, Amount, Assets Estimated fair value amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary. Adjustment to Compensation, Amount Adjustment to Compensation Amount Fair Value Measurements, Nonrecurring Fair Value Measurements, Nonrecurring [Table Text Block] Increase in other assets Increase (Decrease) in Other Operating Assets Principles Of Consolidation Consolidation, Policy [Policy Text Block] Share-based compensation expense related to stock appreciation rights Share-Based Payment Arrangement, Noncash Expense 2029 - Finance Finance Lease, Liability, to be Paid, Year Three Employee Stock Option Share-Based Payment Arrangement, Option [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Debt and equity securities, net realized gain (loss) Debt and Equity Securities, Realized Gain (Loss) Proceeds from sales and distributions of other investments and assets Proceeds from Sale of Other Investments Dividends paid Dividends, Common Stock, Cash Total stockholders' equity Balance, beginning of period Balance, end of period Total stockholders' equity Equity, Attributable to Parent Other Comprehensive Income (Loss), Net of Tax [Abstract] Other Comprehensive Income (Loss), Net of Tax [Abstract] Insider Trading Policies and Procedures [Line Items] Share-based payment arrangement, expense Share-Based Payment Arrangement, Expense Common stock, shares authorized Common Stock, Shares Authorized Total Liabilities and Stockholders’ Equity Liabilities and Equity Thereafter - Total LesseeLeaseLiabilityPaymentsDueAfterYearFour Amount of lessee's undiscounted obligation for lease payment for operating and finance leases due after fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Postretirement Benefit Plans Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Share-based Compensation Arrangement by Share-based Payment Award, SARS, Outstanding [Roll Forward] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Liabilities and Stockholders' Equity Liabilities and Equity [Abstract] Cover [Abstract] Cover [Abstract] Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Maximum Maximum [Member] Weighted average exercise price, exercisable as of March 31, 2026 Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Identifiable intangible assets, net Finite-Lived Intangible Assets, Net Debt securities, available-for-sale, unrealized loss position, total Debt Securities, Available-for-Sale, Unrealized Loss Position Due after ten years, amortized cost Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Purchases of other investments Payments to Acquire Other Investments Schedule of Share-based Compensation Arrangements by Share-based Payment Award Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Pay vs Performance Disclosure [Line Items] Operating lease, liability Operating Lease, Liability Retirement Benefits [Abstract] Retirement Benefits [Abstract] 2030 - Total LesseeLeaseLiabilityPaymentsDueYearFour Amount of lessee's undiscounted obligation for lease payments for operating and financing leases to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Liabilities: Liabilities [Abstract] Intangible Assets, Goodwill and Title Plants Business Combination [Text Block] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Finance lease, right-of-use asset, amortization Finance Lease, Right-of-Use Asset, Amortization Income before Income Taxes Income (loss) before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Proceeds from sales of property Proceeds from Sale of Property, Plant, and Equipment Goodwill, impairment loss Goodwill, Impairment Loss Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Title Insurance Operating Segments [Member] Schedule of Variable Interest Entities [Table] Variable Interest Entity [Table] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount 2029 - Operating Lessee, Operating Lease, Liability, to be Paid, Year Three Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Comprehensive Income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Reclassification out of Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Table] Name Measure Name Due in one year or less, fair value Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Operating lease, liability, current Operating Lease, Liability, Current Interest on lease liabilities Finance Lease, Interest Expense Equity Securities, Industry [Domain] Industry Sector [Domain] Deferred income taxes, net Deferred Income Tax Liabilities, Net Document Fiscal Period Focus Document Fiscal Period Focus Goodwill and other intangible assets, net Intangible Assets, Net (Including Goodwill) Earnings Per Common Share And Share Awards [Table] Earnings Per Common Share And Share Awards [Table] Earnings Per Common Share And Share Awards [Table] Award Timing Method Award Timing Method [Text Block] Schedule of Gross Unrealized Gains (Losses) and Amortized Cost for Securities Unrealized Gain (Loss) on Investments [Table Text Block] Award Type [Axis] Award Type [Axis] Total Assets Total assets Assets 2026 Finite-Lived Intangible Asset, Expected Amortization, Year One Trading Symbol Trading Symbol 2030 - Operating Lessee, Operating Lease, Liability, to be Paid, Year Four 2029 - Total LesseeLeaseLiabilityPaymentsDueYearThree Amount of lessee's undiscounted obligation for lease payments for operating and financing leases to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Proceeds from sales and maturities of short-term investments Proceeds from Sale, Maturity and Collection of Short-Term Investments Entity Address, City or Town Entity Address, City or Town Operating Activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Finance lease, weighted average discount rate, percent Finance Lease, Weighted Average Discount Rate, Percent Net premiums written Net Premiums Written [Member] Net Premiums Written [Member] Accrued interest and dividends Accrued dividends and interest, Estimated fair value Accrued dividends and interest, Estimated fair value Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Other Other Resources, Miscellaneous [Member] Other Resources, Miscellaneous [Member] Gross gains on other investments Gains On Other Assets and Investments Gains on other assets and investments Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] 2029 Finite-Lived Intangible Asset, Expected Amortization, Year Four Variable Interest Entity, Not Primary Beneficiary [Line Items] Variable Interest Entity [Line Items] Entity Emerging Growth Company Entity Emerging Growth Company 2027 - Finance Finance Lease, Liability, to be Paid, Year One Number of Special Revenue Bonds Number of Special Revenue Bonds Number of Special Revenue Bonds Other investments Other investments Other Investments Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Finance lease, weighted average remaining lease term Finance Lease, Weighted Average Remaining Lease Term Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-Sale [Line Items] Number of shares, outstanding beginning balance Number of shares, outstanding ending balance Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Less: Present Value Adjustment - Finance Finance Lease, Liability, Undiscounted Excess Amount Common stock, shares outstanding Common Stock, Shares, Outstanding Other assets, fair value disclosure Other Assets, Fair Value Disclosure PEO PEO [Member] Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Schedule Of Fixed Maturity Securities Investments Classified by Contractual Maturity Date [Table Text Block] Changes in assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Schedule Of Aggregate Amortization Expense for Intangible Assets Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Retained Earnings Retained Earnings [Member] Accounts payable and accrued liabilities Accounts Payable and Accrued Liabilities Payments of claims, net of recoveries Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Summary Of Approximate Values By Year Found Within Consolidated Balance Sheets Summary Of Approximate Values By Year Found Within Consolidated Balance Sheets [Table Text Block] Summary Of Approximate Values By Year Found Within Consolidated Balance Sheets Table Text Block Cash and Cash Equivalents, Beginning of Period Cash and Cash Equivalents, End of Period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Income Statement [Abstract] Provision for Income Taxes Tax Income Tax Expense (Benefit) Total temporarily impaired securities, 12 months or longer, fair value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Purchases of equity securities Payments to Acquire Marketable Securities Other assets Other Assets Current income taxes payable Taxes Payable, Current Non-title services Non-Title Services Revenue Non-Title Services Revenue Preferred stock, shares issued Preferred Stock, Shares Issued Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Other investment income Noninterest Income, Other Product and Service [Domain] Product and Service [Domain] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Summary Of Approximate Values By Year Found Within Consolidated Statements Of Income Summary Of Approximate Values By Year Found Within Consolidated Statements of Income [Table Text Block] Summary Of Approximate Values By Year Found Within Consolidated Statements of Income [Table Text Block] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Equity securities, realized losses Equity Securities, FV-NI, Realized Loss Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] SARs SARs StockAppreciationRightsShareSettledSARS [Member] Right to receive stock-based compensation equal to the appreciation of a predetermined number of the entity's shares, during a predetermined time period. Small business investment LPs Variable Interest Entity, Not Primary Beneficiary, Small Business Investment LP [Member] [Member] VIE’s that are small business investment LP investments. Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Aggregate intrinsic value, unvested as of March 31, 2026 Share Based Compensation Arrangement By Share Based Payment Award, Options, Unvested, Intrinsic Value Share based compensation arrangement by share based payment award, options, unvested, intrinsic value Fair Value Measurements, Nonrecurring Value Measurement [Abstract] Less present value adjustment - Total LesseeLeaseLiabilityUndiscountedExcessAmount Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating and financing leases. City Area Code City Area Code Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Earnings Per Common Share And Share Awards Earnings Per Share And Share Awards [Text Block] EarningsPerShareAndShareAwardsTextBlock All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Lease assets Lease Right Of Use Asset Amount of lessee's right to use underlying asset under operating and finance leases. Schedule of Trading Securities and Other Trading Assets [Table] Debt Securities, Trading, and Equity Securities, FV-NI [Table] % of IBNR Liability For Title Claims And Claims Adjustment Expense Incurred But Not Reported Percentage Liability For Title Claims And Claims Adjustment Expense Incurred But Not Reported (IBNR) Percentage. Investing Activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Net cash provided by (used in) operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Related Party Transactions [Abstract] Related Party Transactions [Abstract] Corporate debt securities, realized gains Debt Securities, Realized Gain (Loss) Amortization of unrecognized gain (loss) Defined Benefit Plan, Amortization of Gain (Loss) Lease cost Lease, Cost Goodwill Goodwill Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Lease, Cost Lease, Cost [Table Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Depreciation Depreciation Net investment gains (losses) Net investment (gains) losses Net investment gains (losses) Gain (Loss) on Investments 2030 - Finance Finance Lease, Liability, to be Paid, Year Four Notes receivable, fair value disclosure Notes Receivable, Fair Value Disclosure Statement, Equity Components [Axis] Equity Components [Axis] Sublease Income Sublease Income Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Income tax (expense) benefit related to reclassification adjustment for sale of securities included in net income Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Write-down of securities Other Than Temporary Impairment Loss Investment Securities Recognized in Earnings Other Than Temporary Impairment Loss Investment Securities Recognized in Earnings 2027 - Total LesseeLeaseLiabilityPaymentsDueNextTwelveMonths Amount of lessee's undiscounted obligation for lease payments for operating and financing leases to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Number of reportable segments Number of Reportable Segments Supplemental Disclosures: Supplemental Cash Flow Information [Abstract] Fixed maturities, available-for-sale, amortized cost Total, amortized cost Debt Securities, Available-for-Sale, Amortized Cost Provision for claims Provision for claims Policyholder Benefits and Claims Incurred, Net Other Performance Measure, Amount Other Performance Measure, Amount Share-based Compensation Arrangement by Share-based Payment Award, SARs, Outstanding, Weighted Average Exercise Price [Roll Forward] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Entity Address, State or Province Entity Address, State or Province Related Party [Domain] Related and Nonrelated Parties [Domain] Deferred tax expense related to postretirement benefits obligation Adjustments To Postretirement Benefits Obligation, Net Of Deferred Tax Benefit Provision Adjustments To Postretirement Benefits Obligation, Net Of Deferred Tax Benefit Provision Individual: Individual [Axis] Entities [Table] Entities [Table] Government obligations Sovereign Debt [Member] Investments in securities: Investments [Abstract] Net cash provided by investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Exchange Services Exchange Services [Member] Exchange Services Document Fiscal Year Focus Document Fiscal Year Focus Maximum Potential Loss (a) Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Lessee, Lease Liability, Maturity LesseeLeaseLiabilityMaturityTableTextBlock [Table Text Block] Tabular disclosure of undiscounted cash flows of lessee's operating and finance lease liabilities. Includes, but is not limited to, reconciliation of undiscounted cash flows to the lease liability recognized in statement of financial position. Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Schedule of Available-for-sale Securities [Table] Schedule of Gain (Loss) on Securities [Table] Earnings Per Common Share And Share Awards [Line Items] Earnings Per Common Share And Share Awards [Line Items] Earnings Per Common Share And Share Awards [Line Items] Entity Interactive Data Current Entity Interactive Data Current Equity securities, realized gains Equity Securities, FV-NI, Realized Gain All Other Other Operating Segment [Member] Operating leases Operating Lease, Cost Investment Objective [Domain] Investment Objective [Domain] Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract] Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract] Number of shares, SARS exercised Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Aggregate intrinsic value, exercisable as of March 31, 2026 Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value Known title claims Liability for Unpaid Claims and Claims Adjustment Expense, Reported Claims, Amount Segment Information Segment Reporting Disclosure [Text Block] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Weighted average exercise price, unvested as of March 31, 2026 Share Based Compensation Arrangement By Share Based Payment Award, Options, Unvested, Weighted Average Exercise Price Share based compensation arrangement by share based payment award, options, unvested, weighted average exercise price Components Of Net Periodic Benefits Cost Schedule of Net Benefit Costs [Table Text Block] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Accumulated Other Comprehensive Income Comprehensive Income (Loss) Note [Text Block] 2028 - Finance Finance Lease, Liability, to be Paid, Year Two Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Amortization of other intangible assets, net Amortization of Intangible Assets Exchange [Domain] Exchange [Domain] Schedule Of Changes In Balances Of Each Component Of Accumulated Other Comprehensive Income, Net Of Tax Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Decrease in current income taxes recoverable Increase (Decrease) in Income Taxes Receivable Entity Central Index Key Entity Central Index Key Other comprehensive (loss) income, before tax: Other Comprehensive Income (Loss), before Tax [Abstract] PEO Name PEO Name Total Revenues Total Revenues Revenues Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Payments of claims, net of recoveries Payments of Claims Net Recoveries Cash outflow during the period to pay policyholder benefits, claims and claims settlement expenses, net of recoveries. Lessee Leases Lessee Leases [Text Block] The entire disclosure for leases of the lessee, both operating leases and financing leases. Includes, but is not limited to, description of leases and maturity analysis of lease liability. Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Provision charged to operations Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Other sources of revenue Revenue, Other Resources Revenue, Other Resources Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plan [Table] Lease Liability - Finance Finance Lease, Liability Arrangement Duration Trading Arrangement Duration Schedule of Segment Reporting Information, by Segment Schedule of Segment Reporting Information, by Segment [Table] Net premiums written Net premiums written Premiums Written, Net Title Insurance Title Insurance [Member] Title Insurance Statement, Business Segments [Axis] Segments [Axis] Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Local Phone Number Local Phone Number Class of Stock [Domain] Class of Stock [Domain] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Common stock, no par value Common Stock, No Par Value Subsequent Event Type [Axis] Subsequent Event Type [Axis] Average remaining contractual term, unvested as of March 31, 2026 Share Based Compensation Arrangement By Share Based Payment Award, Options, Unvested, Weighted Average Remaining Contractual Term Share based compensation arrangement by share based payment award, options, unvested, weighted average remaining contractual term Assets: Assets [Abstract] Underlying Security Market Price Change Underlying Security Market Price Change, Percent 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Three Investments In Securities and Fair Value Investments In Securities and Fair Value [Text Block] Investments In Securities and Fair Value [Text Block] Retirement Agreements And Other Postretirement Benefits Retirement Benefits [Text Block] Stockholders' Equity: Equity, Attributable to Parent [Abstract] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Entity Address, Address Line One Entity Address, Address Line One Accumulated Other Comprehensive Income AOCI Attributable to Parent [Member] Commissions to agents Commissions to agents Insurance Commissions Increase in lease liabilities Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Investment income (loss) Investment Income Investment Income Operating lease, liability, noncurrent Operating Lease, Liability, Noncurrent Equity Securities by Industry [Axis] Industry Sector [Axis] Fair Value as of Grant Date Award Grant Date Fair Value Equity securities, cost Equity securities, cost Equity Securities, FV-NI, Cost Entity Registrant Name Entity Registrant Name Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Net periodic benefits costs Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Total FiniteAndIndefiniteLivedIntangibleAssetsGross Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with finite and indefinite lives. Personnel expenses Labor and Related Expense Incremental shares outstanding assuming the exercise of dilutive stock options and SARs (share settled) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Escrow and other title-related fees Escrow And Other Title-Related Fees Escrow And Other Title-Related Fees Share-based payment arrangement, nonvested award, cost not yet recognized, amount Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Related Party Transaction [Line Items] Related Party Transaction [Line Items] Document Quarterly Report Document Quarterly Report Total temporarily impaired securities, less than 12 months, fair value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Assets, fair value disclosure Assets, Fair Value Disclosure Debt securities, available-for-sale, unrealized loss position, number of positions Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] 2028 - Operating Lessee, Operating Lease, Liability, to be Paid, Year Two Accretion of investments, net Accretion (Amortization) of Discounts and Premiums, Investments Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Average remaining contractual term, outstanding beginning balance Average remaining contractual term, outstanding ending balance Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Accrued interest and dividends Accrued Investment Income Receivable Related Party Transactions, by Related Party [Axis] Related and Nonrelated Parties [Axis] Interest cost on the projected benefit obligation Defined Benefit Plan, Interest Cost Total investments Investments Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Provision for claims (Benefit) Provision For Claims (Benefit) Provision For Claims Schedule of Finite-Lived Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Prepaid expenses and other receivables Prepaid Expense and Other Assets Restatement Determination Date: Restatement Determination Date [Axis] Share-based compensation arrangement by share-based payment award, shares purchased for award Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Purchased for Award Premiums and fees receivable Premiums and fees receivable Premiums and Other Receivables, Net Non-PEO NEO Non-PEO NEO [Member] Aggregate intrinsic value, outstanding beginning balance Aggregate intrinsic value, outstanding ending balance Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Accumulated Other Comprehensive Income Loss Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income Loss [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Amounts reclassified from accumulated other comprehensive income Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Debt securities, available-for-sale, accumulated gross unrealized gain, before tax Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Name Trading Arrangement, Individual Name Award Type [Domain] Award Type [Domain] Award Type [Domain] 2027 - Operating Lessee, Operating Lease, Liability, to be Paid, Year One Equity Awards Adjustments Equity Awards Adjustments [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Other Other Other Income Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Compensation Amount Outstanding Recovery Compensation Amount Summary Of Share-Based Award Transactions Share-Based Payment Arrangement, Activity [Table Text Block] Income tax expense related to postretirement health benefits Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax Summary Of Transactions In Reserves For Claims Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Due after one year through five years, amortized cost Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Name Awards Close in Time to MNPI Disclosures, Individual Name Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Reclassification adjustment for sale of securities included in net income Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Revenues: Revenues [Abstract] 2026 - Finance Finance Lease, Liability, to be Paid, Remainder of Fiscal Year Due five years through ten years, amortized cost Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Referral relationships Finite-Lived Customer Relationships, Gross Share-based compensation expense related to stock appreciation rights APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Income tax (benefit) expense related to net unrealized (losses) gains on investments arising during the period OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Thereafter - Operating LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour Amount of lessee's undiscounted obligation for lease payment for operating lease due after fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Major Types of Trading Securities and Assets [Domain] Financial Instruments [Domain] Identifiable intangible assets, net Finite And Indefinite Lived Intangible Assets Net Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with finite and indefinite lives. Segment [Domain] Segments [Domain] Debit and equity securities, realized gains Debit and Equity Securities, Realized Gain Amount of realized gain on investments in debt and equity securities Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Fair Value Hierarchy and NAV [Domain] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] Unrealized Gains and Losses On Available-for-Sale Securities Unrealized Gains and Losses on Available-For-Sale Securities AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] Company Selected Measure Name Company Selected Measure Name Purchases of fixed maturity securities Payments to Acquire Debt Securities, Available-for-Sale Lease expense before sub-lease income Lease expense before sub-lease income Amount of lease cost recognized by lessee for lease contract before sub-lease income Preferred stock (1,000 authorized shares; no shares issued) Preferred Stock, Value, Issued Aggregate Available Trading Arrangement, Securities Aggregate Available Amount General obligations of U.S. states, territories and political subdivisions US States and Political Subdivisions Debt Securities [Member] Deferred tax benefit (provision) related to unrealized loss (gain) on investments Deferred Tax Provision Related to Unrealized Gain Loss on Investments The amount of deferred tax provision resulting from unrealized gains and losses during the period. Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Other comprehensive (loss) income, before income tax Other Comprehensive Income (Loss), before Tax All Executive Categories All Executive Categories [Member] Impairment of intangible assets (excluding goodwill) Impairment of Intangible Assets (Excluding Goodwill) Common stock – no par value (10,000 authorized shares; 1,888 and 1,888 shares issued and outstanding as of March 31, 2026 and December 31, 2025, respectively, excluding in each period 292 shares of common stock held by the Company) Common Stock, Value, Issued Money market funds and U.S. Treasury bills Short-Term Investments Commitments And Contingencies Commitments and Contingencies Disclosure [Text Block] Accumulated Other Comprehensive Income (Loss) [Roll Forward] Accumulated Other Comprehensive Income (Loss) [Roll Forward] Accumulated Other Comprehensive Income (Loss) [Roll Forward] Weighted Average Shares Outstanding – Diluted Weighted average common shares outstanding - Diluted Weighted Average Number of Shares Outstanding, Diluted Commitments and Contingencies Commitments and Contingencies No Trading Symbol Flag No Trading Symbol Flag Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Entity Small Business Entity Small Business Other expenses Other Cost and Expense, Operating Document Transition Report Document Transition Report Due after one year through five years, fair value Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five RightsToPurchaseSeriesAJuniorParticipatingPreferredStock [Member] RightsToPurchaseSeriesAJuniorParticipatingPreferredStock [Member] Rights to purchase Series A Junior Participating Preferred Stock [Member] 2028 - Total LesseeLeaseLiabilityPaymentsDueYearTwo Amount of lessee's undiscounted obligation for lease payments for operating and financing leases to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Total undiscounted payments - Finance Finance Lease, Liability, to be Paid Title plants Title Plants Amount after accumulated impairment loss of title plants IBNR Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Amount Underlying Securities Award Underlying Securities Amount Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Due after ten years, fair value Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Subsequent Events, Policy Subsequent Events, Policy [Policy Text Block] Equity investments in unconsolidated affiliates, measurement alternative Investments in Affiliates, Subsidiaries, Associates, and Joint Ventures, Fair Value Disclosure Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Average remaining contractual term, exercisable as of March 31, 2026 Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Increase in lease assets Increase (Decrease) in Accounts Receivable and Other Operating Assets Thereafter - Finance Finance Lease Liability Payments Due After Year Four Amount of lessee's undiscounted obligation for lease payment for finance leases due after fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Document Type Document Type Level 3 Fair Value, Inputs, Level 3 [Member] Reserves For Claims Liability for Future Policy Benefits and Unpaid Claims Disclosure [Text Block] Name Outstanding Recovery, Individual Name Schedule of Available-for-sale Securities [Table] Marketable Securities [Table] Product and Service [Axis] Product and Service [Axis] Insurance and other services revenue Insurance And Other Services Revenue Revenue from net title insurance premiums written and other services. Revenue from contracts with customers Revenue from Contract with Customer, Excluding Assessed Tax All Individuals All Individuals [Member] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Purchases of property Payments to Acquire Property, Plant, and Equipment Name Forgone Recovery, Individual Name SARs expiration period Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period Statistical Measurement [Axis] Statistical Measurement [Axis] Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Write-down of other assets Other Asset Impairment Charges Reclassification out of Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Member] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Short-term investments Other Short-Term Investments Entity Information [Line Items] Entity Information [Line Items] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Net gains (losses) on other investments Gain (Loss) on Sale of Other Investments Debt and equity securities, realized loss Debt and Equity Securities, Realized Loss Amount of realized loss on investments in debt and equity securities Total Operating Expenses Operating expenses Operating Expenses Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Level 1 Fair Value, Inputs, Level 1 [Member] Shares, outstanding Shares, Outstanding Schedule of Related Party Transactions, by Related Party Related Party Transaction [Table] Diluted Earnings per Common Share Earnings Per Share, Diluted Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Marketable Security, Gain (Loss) [Abstract] Marketable Security, Gain (Loss) [Abstract] Title of 12(b) Security Title of 12(b) Security Due five years through ten years, fair value Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Number of shares, unvested as of March 31, 2026 Share Based Compensation Arrangement By Share Based Payment Award, Options, Unvested, Number share based compensation arrangement by share based payment award, options, unvested, number Investment-related revenue Investment Related Revenue [Member] Investment Related Revenue [Member] Investment Objective [Axis] Investment Objective [Axis] Liability for employee benefits and other payments Liability, Defined Benefit Pension Plan Earnings Per Share [Abstract] Earnings Per Share [Abstract] Consolidation Items [Domain] Consolidation Items [Domain] Special revenue issuer obligations of U.S. states, territories and political subdivisions Issuer Obligations Us States And Political Subdivisions Debt Securities Special Revenues [Member] Issuer Obligations, US States and Political Subdivisions Debt Securities Special Revenues [Member] Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Fair​Value​Assets​Measured​On​Nonrecurring​Basis​Reconciliation​Calculation​Roll​Forward [Line Items] Fair​Value​Assets​Measured​On​Nonrecurring​Basis​Reconciliation​Calculation​Roll​Forward [Line Items] Fair​Value​Assets​Measured​On​Nonrecurring​Basis​Reconciliation​Calculation​Roll​Forward [Line Items] Debt Securities, Available-for-sale [Line Items] Gain (Loss) on Securities [Line Items] Less: Present value adjustment - Operating Lessee, Operating Lease, Liability, Undiscounted Excess Amount Income tax payments, net Income Taxes Paid, Net Weighted average exercise price, SARS exercised Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price 2027 Finite-Lived Intangible Asset, Expected Amortization, Year Two Award Timing Disclosures [Line Items] Service cost - benefits earned during the year Defined Benefit Plan, Service Cost Weighted average exercise price, SARs granted Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Gain (Loss) on Securities Gain (Loss) on Securities [Table Text Block] Total Undiscounted payments - Operating Lessee, Operating Lease, Liability, to be Paid Net unrealized gain (loss) on investments Non-cash net unrealized loss (gain) on investments, net of deferred tax benefit (expense) of $205 and $(48) for March 31, 2026 and 2025, respectively OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Other comprehensive (loss) income before calculations Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Lessee, Lease Liability, Current and Non-current lessee, lease liability, current noncurrent [Table Text Block] Lessee, lease liability, current and noncurrent Accumulated postretirement (benefit) expense obligation adjustment Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax Net Income Net income Net income Net Income (Loss) Attributable to Parent Subsequent Event [Table] Subsequent Event [Table] Intersegment Eliminations Intersegment Eliminations [Member] Schedule of Unrealized Loss on Investments Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] Expiration Date Trading Arrangement Expiration Date 2030 Finite-Lived Intangible Asset, Expected Amortization, Year Five Total temporarily impaired securities Fixed Income Securities [Member] SARs vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Property, net Property, Plant and Equipment, Net Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Preferred stock, shares authorized Preferred Stock, Shares Authorized Adoption Date Trading Arrangement Adoption Date Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] (Increase) decrease in premium and fees receivable Increase (Decrease) in Accounts Receivable Cash Paid During the Year for: Cash Paid During The Year [Abstract] Cash Paid During The Year [Abstract] Entity Current Reporting Status Entity Current Reporting Status Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Consolidation Items [Domain] Consolidated Entities [Domain] Due in one year or less, amortized cost Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Summary of the Company's Loss Reserves Schedule Of Liability For Unpaid Claims And Claims Adjustment Expense Reported And Incurred But Not Reported Claims [Table Text Block] Schedule of liability for unpaid claims and claims adjustment expense reported and incurred but not reported claims. Retained earnings Retained Earnings (Accumulated Deficit) Net loss on disposals of property Gain (Loss) on Disposition of Property Plant Equipment Schedule of Trading Securities and Other Trading Assets, Major Types of Trading Securities and Assets [Axis] Financial Instrument [Axis] Operating Expenses: Benefits, Losses and Expenses [Abstract] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Executive Category: Executive Category [Axis] Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Share-based compensation arrangement by share-based payment award, grants in period, net of forfeitures Number of shares, SARs granted Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Net of Forfeitures Title Insurance Agencies Limited Liability Company [Member] Finance lease, liability, current Finance Lease, Liability, Current Current Fiscal Year End Date Current Fiscal Year End Date Class of Stock [Axis] Class of Stock [Axis] Total temporarily impaired securities, less than 12 Months, unrealized losses Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Subsequent Event Type [Domain] Subsequent Event Type [Domain] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Carrying Value VariableInterestEntityNonconsolidatedCarryingAmount Carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary Statement [Table] Statement [Table] % of known title reserves Liability For Title Claims And Claims Adjustment Expense Known Claims Percentage Liability for title claims and claims adjustment expense known claims percentage. Benefit for deferred income taxes Deferred Income Tax Expense (Benefit) Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Financing Activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Debt securities, available-for-sale, unrealized loss position, accumulated loss Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss Schedule of Finite-Lived Intangible Assets [Abstract] Schedule of Finite-Lived Intangible Assets [Abstract] Schedule of Finite-Lived Intangible Assets [Abstract] Schedule Of Carrying Value And Fair Value Of Financial Assets Disclosed Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Proceeds from sales of equity securities Proceeds from Sale and Maturity of Marketable Securities Finance lease, liability, noncurrent Finance Lease, Liability, Noncurrent Equity securities, at fair value (cost: March 31, 2026: $33,048; December 31, 2025: $28,575) Equity securities, estimated fair value Equity Securities, FV-NI, Current Basis Of Presentation And Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Anti-dilutive shares excluded from computation of diluted earnings per share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount All Adjustments to Compensation All Adjustments to Compensation [Member] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Amendment Flag Amendment Flag Lease liabilities Lease Liability Present value of lessee's discounted obligation for lease payments from operating and financing leases. Reserve for claims Total reserve for claims Liability for Claims and Claims Adjustment Expense Common stock, held by Company's subsidiary Common Stock Held By Companys Subsidiary Common Stock Held By Company's Subsidiary Termination Date Trading Arrangement Termination Date Net cash used in financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Measure: Measure [Axis] Thereafter Finite-Lived Intangible Asset, Expected Amortization, after Year Five Weighted average discount rate Operating Lease, Weighted Average Discount Rate, Percent Schedule Of Fair Value Assets Measured On Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Weighted Average Shares Outstanding – Basic Weighted average common shares outstanding - Basic Weighted Average Number of Shares Outstanding, Basic Computation Of Basic And Diluted Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Number of shares, exercisable as of March 31, 2026 Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number Schedule Of Reclassification Out Of Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Segment Reporting [Abstract] Segment Reporting [Abstract] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Defined Benefit Plan, Plan Assets, Category [Axis] Defined Benefit Plan, Plan Assets, Category [Axis] Entity Tax Identification Number Entity Tax Identification Number Non-compete agreements Finite-Lived Noncompete Agreements, Gross Like-kind exchange deposits and reverse exchange property Like-Kind Exchange Deposits And Reverse Exchange Property Like-kind exchange deposits and reverse exchange property Schedule of Variable Interest Entities Schedule of Variable Interest Entities [Table Text Block] Net unrealized (losses) gains on investments arising during the period OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax Total undiscounted payments - Total LesseeLeaseLiabilityPaymentsDue Amount of lessee's undiscounted obligation for lease payments for operating and financing leases. Measurement Alternative Investments Fair​Value​Assets​Measured​On​Nonrecurring​Basis​Reconciliation​Calculation​Roll​Forward [Table] Fair​ Value​ Assets ​Measured ​On ​Nonrecurring ​Basis ​Reconciliation ​Calculation​ Roll​Forward [Table] Weighted average exercise price, outstanding beginning balance Weighted average exercise price, outstanding ending balance Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Consolidation Items [Axis] Consolidated Entities [Axis] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Common stock, shares issued Common Stock, Shares, Issued % of total loss reserves Liability For Unpaid Claims And Claims Adjustment Expense Reported And Incurred But Not Reported Claims Percentage Liability for unpaid claims and claims adjustment expense reported and incurred but not reported (IBNR) claims percentage. Current income taxes recoverable Income Taxes Receivable, Current Weighted average remaining lease term (years) Operating Lease, Weighted Average Remaining Lease Term Escrow and other title-related fees Escrow, Title-Related And Other Fees [Member] Escrow, Title-Related And Other Fees [Member] Use Of Estimates And Assumptions Use of Estimates, Policy [Policy Text Block] Dividends paid Payments of Dividends Trading Arrangement: Trading Arrangement [Axis] Increase in current income taxes payable Increase (Decrease) in Income Taxes Payable Total Shareholder Return Amount Total Shareholder Return Amount Insider Trading Arrangements [Line Items] Security Exchange Name Security Exchange Name Lease Other Information Lease Other Information [Table Text Block] Lease Other Information Interest and dividends Investment Income, Interest and Dividend Total liabilities Liabilities Accumulated postretirement benefit obligation adjustment Adjustments to postretirement benefits obligation, net of deferred tax expense of $(6) and $(15) for March 31, 2026 and 2025, respectively Accumulated Postretirement Benefit Obligation Adjustment Accumulated Postretirement Benefit Obligation Adjustment Net losses (earnings) from other investments Earnings From Other Investments Earnings from other investments that flow though net income Defined Benefit Plan, Plan Assets, Category [Domain] Defined Benefit Plan, Plan Assets, Category [Domain] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Proceeds from sales and maturities of fixed maturity securities Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale Office and technology expenses Office Occupancy And Operations Office Occupancy And Operations Number of SARs granted where exercise price was less than market price on date of grant Number Of Stock Options Or SARs Granted Where Exercise Price Was Less Than Market Price On Date Of Grant Number of stock options or SARs granted where exercise price was less than market price on date of grant. Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Asset Class [Domain] Asset Class [Domain] Statement [Line Items] Statement [Line Items] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Consolidation Items [Axis] Consolidation Items [Axis] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and Cash Equivalent Subsequent Event [Line Items] Subsequent Event [Line Items] Common Stock Common stocks Common Stock [Member] Real estate LLCs or LPs Variable Interest Entity, Not Primary Beneficiary, Real Estate LLC or LP [Member] [Member] VIEs that are real estate LLC or LP investments. Fixed maturity securities, available-for-sale, at fair value (amortized cost: March 31, 2026: $117,028; December 31, 2025: $116,852) Total, fair value Debt securities, available-for-sale Debt Securities, Available-for-Sale Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Corporate debt securities Corporate Debt Securities [Member] Net Increase in Cash and Cash Equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation