Document And Entity Information Document Information [Table] Document Information [Line Items] Document Type Document Type Document Annual Report Document Period End Date Document Period End Date Document Transition Report Securities Act File Number Entity Registrant Name Entity Registrant Name Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Address, Address Line One Entity Address, Address Line Two Entity Address, City or Town Entity Address, State or Province Entity Address, Postal Zip Code City Area Code Local Phone Number Title of 12(b) Security Trading Symbol Trading Symbol Security Exchange Name Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Filer Category Entity Small Business Entity Emerging Growth Company ICFR Auditor Attestation Flag Document Financial Statement Error Correction [Flag] Entity Shell Company Entity Public Float Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Documents Incorporated by Reference [Text Block] Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Auditor Name Auditor Firm ID Auditor Location Consolidated Balance Sheets Statement [Table] Statement [Line Items] Assets [Abstract] Assets Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Restricted Cash and Cash Equivalents Restricted cash Agency debt securities and related cash assets securing obligations under the Fannie Mae DUS program. Pledged Security Assets, at Fair Value Pledged securities, at fair value Pledged securities Financing Receivable, Held-for-Sale, Not Part of Disposal Group, after Valuation Allowance Loans held for sale Loans held for sale, at fair value Servicing Asset at Amortized Cost Ending balance Beginning balance Mortgage servicing rights Goodwill Goodwill Goodwill Intangible Assets, Net (Excluding Goodwill) Other intangible assets Accounts Receivable, after Allowance for Credit Loss Receivables, net Investment in tax credit equity investments committed to be transferred to tax credit fund. Committed Investment in Tax Equity Committed investments in tax credit equity Other Assets Other assets Total Assets Total assets Total assets Liabilities [Abstract] Liabilities The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit including liabilities associated with loans held for sale with exercisable repurchase options. Line of Credit, Borrowings, Including Liabilities On Loans Held For Sale Associated with Exercisable Repurchase Options Warehouse notes payable Total Borrowings Notes Payable Corporate notes payable Carrying balance Amount of allowance to cover probable credit losses on loans under the Company's risk-sharing obligations with Fannie Mae. Allowance For Risking Sharing Obligations Ending balance Beginning balance Allowance for risk-sharing obligations Deferred Income Tax Liabilities, Net Deferred tax liabilities, net The carrying amount of liabilities as of the balance sheet date that pertain to unfunded committed capital for tax credit equity investments. Commitments to Fund Equity Investments Commitments to fund investments in tax credit equity Other Liabilities Other liabilities Total Liabilities Total liabilities Temporary Equity [Abstract] Temporary Equity The carrying amount of ownership profit interests issued by a consolidated subsidiary to holders other than the Company that are redeemable or become redeemable upon the occurrence of specified events and therefore are classified outside of permanent equity (temporary equity). These interests represent a redeemable noncontrolling interest in the subsidiary under applicable accounting guidance. Profit Interests of a Wholly-Owned Subsidiary Subject to Possible Redemption Ending balance, Temporary equity Beginning balance, Temporary equity Profit interests of a wholly owned subsidiary subject to possible redemption Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Stockholders' Equity Preferred Stock, Value, Issued Preferred stock (authorized 50,000 shares; none issued) Common Stock, Value, Issued Common stock ($0.01 par value; authorized 200,000 shares; issued and outstanding 33,389 shares as of December 31, 2025 and 33,194 shares as of December 31, 2024) Additional Paid in Capital, Common Stock Additional paid-in capital ("APIC") Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive income (loss) ("AOCI") Retained Earnings (Accumulated Deficit) Retained earnings Equity, Attributable to Parent Total stockholders' equity Equity, Attributable to Noncontrolling Interest Noncontrolling interests Equity, Including Portion Attributable to Noncontrolling Interest Balances at the end of the period Balances at the beginning of the period Total permanent equity Commitments and Contingencies Commitments and contingencies (NOTES 2 and 12) Liabilities and Equity Total liabilities, temporary equity, and permanent equity Preferred Stock, Shares Authorized Preferred shares, authorized Preferred Stock, Shares Issued Preferred shares, issued Common Stock, Par or Stated Value Per Share Common stock, par value (in dollars per share) Common Stock, Shares Authorized Common stock, authorized Common Stock, Shares, Issued Balance at the end of the period (in shares) Balance at the beginning of the period (in shares) Common stock, issued Common Stock, Shares, Outstanding Common stock, outstanding Consolidated Statements of Income and Comprehensive Income Product and Service [Axis] Product and Service [Domain] Income from contractual loan origination related fees, including revenue from contracts with customers, net of expense related to co-broker fees paid for obtaining loans. Loan Origination and Debt Brokerage Fees, Net Loan origination and debt brokerage fees, net Income from the estimated fair value of the expected net future cash flows associated with the servicing of loans net of the decrease in gains from mortgage banking due to the recognition at commitment of the fair value of expected guaranty obligations. Fair Value Of Expected Future Cash Flows From Servicing Rights, Net [Member] Fair value of expected net cash flows from servicing, net of guaranty obligation All amounts that, per contract, are due to the servicer in exchange for servicing the financial asset and would no longer be received by a servicer if the beneficial owners of the serviced assets (or their trustees or agents) were to exercise their actual or potential authority under the contract to shift the servicing to another servicer. Depending on the servicing contract, those fees may include some or all of the difference between the interest rate collected on the asset being serviced and the rate to be paid to the beneficial owners of the asset. Servicing Fees [Member] Servicing fees The amount of revenue derived from real estate property sales broker fees. Property Sales Broker Fees Property sales broker fees The amount of revenue derived from investment management activities including management of low-income housing tax credit equity management, and management of proprietary funds. Investment Management Fees [Member] Investment management fees Net interest income (expense) from loans held for sale and loans held for investment. Net Warehouse Interest Income (Expense),Net [Member] Net warehouse interest income (expense) Amount of interest income, net of interest paid to the borrower, on property level escrow deposits, placement fees, and other miscellaneous income and fee revenue. Escrow earnings and other interest income Placement fees and other interest income Product and Service, Other [Member] Other revenues Other revenues Revenues [Abstract] Revenues Revenues Total revenues Total revenues Operating Expenses [Abstract] Expenses Labor and Related Expense Personnel Depreciation, Depletion and Amortization Amortization and depreciation Accounts Receivable, Credit Loss Expense (Reversal) Provision (benefit) for credit losses Provision (benefit) for credit losses Interest Expense, Debt Interest expense on corporate debt Goodwill, Impairment Loss Goodwill impairment Goodwill impairment Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Fair value adjustments to contingent consideration liabilities Amount of total expenses pertaining to indemnified and repurchased loans. Indemnified And Repurchase Of loan Expense Indemnified and repurchased loan expenses (NOTE 5) Indemnified and repurchased loan expenses Indemnified and repurchased loan expenses Amount of write-down of assets recognized in the income statement and other expenses. Asset impairment And Other Expenses Asset impairments and other expenses (NOTE 17) Asset impairments and other expenses Other Expenses Other operating expenses Total Operating Expenses Total expenses Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income before taxes Income Tax Expense (Benefit) Income tax expense Income tax expense Income tax expense (benefit) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net income before noncontrolling interests and temporary equity holders Net income before noncontrolling interests and temporary equity holders Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest Net income (loss) from noncontrolling interests Less: net income (loss) from noncontrolling interests Net Income (Loss) Attributable to Redeemable Noncontrolling Interest Less: net income (loss) attributable to temporary equity holders Net income (loss) attributable to temporary equity holders Walker & Dunlop net income Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other comprehensive income (loss), net of tax Comprehensive Income (Loss), Net of Tax, Attributable to Parent Walker & Dunlop comprehensive income Earnings Per Share, Basic Basic earnings per share (NOTE 11) Basic EPS Earnings Per Share, Diluted Diluted earnings per share (NOTE 11) Diluted EPS Weighted Average Number of Shares Outstanding, Basic Basic weighted-average shares outstanding Weighted Average Number of Shares Outstanding, Diluted Diluted weighted-average shares outstanding Weighted average diluted shares outstanding Consolidated Statements of Changes in Equity Equity Components [Axis] Equity Component [Domain] Common Stock [Member] Common Stock Additional Paid-in Capital [Member] APIC AOCI Attributable to Parent [Member] AOCI Retained Earnings [Member] Retained Earnings Noncontrolling Interest [Member] Noncontrolling Interests Increase (Decrease) in Temporary Equity [Roll Forward] Temporary Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Change in Stockholders' Equity Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Purchase of noncontrolling interests Other Comprehensive Income (Loss), Net of Tax Other comprehensive income (loss), net of tax Value of shares granted under share based payment arrangement. Temporary Equity, Value, Share Based Payment Arrangement Stock-based compensation - equity classified APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Stock-based compensation - equity classified Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Issuance of common stock in connection with equity compensation plans Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Issuance of common stock in connection with equity compensation plans (in shares) Stock Repurchased and Retired During Period, Value Repurchase and retirement of common stock Reduction of equity for retirement of repurchased shares Stock Repurchased and Retired During Period, Shares Repurchase and retirement of common stock (in shares) Shares repurchased and retired during the period The value of distributions to non-controlling interest and temporary equity interest holders. Temporary Equity, Distributions Distributions to temporary equity interest holders Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Distributions to noncontrolling interest holders Dividends, Common Stock, Cash Cash dividends paid Stockholders' Equity, Other Other activity Common Stock, Dividends, Per Share, Cash Paid Cash dividends paid per common share Cash dividends paid. amount per common share Consolidated Statements of Cash Flows Net Cash Provided by (Used in) Operating Activities [Abstract] Cash flows from operating activities Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by (used in) operating activities: Represents the income recognized at loan commitment attributable to the expected net cash flows from servicing the loan net of the expected guaranty obligation, if any. Gain Attributable To Fair Value Of Future Servicing Rights Net Gains attributable to the fair value of future servicing rights, net of guaranty obligation Change in the premiums and origination fee components of the fair values of derivatives and loans held for sale. Change in Fair Value of Premiums and Origination Fees Change in the fair value of premiums and origination fees (NOTE 2) Share-Based Payment Arrangement, Noncash Expense Stock compensation-equity and liability classified Total stock compensation expense Amount of loss (gains) from loan repurchase. Loss (Gain) On Loan Repurchase Indemnified and repurchased loans expenses - loan repurchase losses (Note 5) Expected principal losses on loan repurchase ("loan repurchase losses") Deferred Income Tax Expense (Benefit) Total deferred expense (benefit) Deferred tax expense (benefit) Cash paid to settle previously recognized risk-sharing obligations. Cash Paid To Settle Risk-Sharing Obligations Cash paid to settle risk-sharing obligations The charge against earnings in the period to reduce the carrying amount of real estate held for investment and equity method investments. Impairment Of Real Estate held For Investment And Equity Method Investments Impairment of real estate held for investment and equity method investment Payment for Origination, Loan, Mortgage, Held-for-Sale Originations of loans held for sale Proceeds from Sale, Loan, Held-for-Sale Proceeds from transfers of loans held for sale Other Operating Activities, Cash Flow Statement Other operating activities, net Increase (Decrease) in Operating Capital [Abstract] Changes in: Increase (Decrease) in Accounts and Other Receivables Receivables, net Increase (Decrease) in Other Operating Assets Other assets Increase (Decrease) in Other Operating Liabilities Other liabilities Net Cash Provided by (Used in) Operating Activities Net cash provided by (used in) operating activities Net Cash Provided by (Used in) Investing Activities [Abstract] Cash flows from investing activities Payments to Acquire Productive Assets Capital expenditures Payments to Acquire Equity Method Investments Capital invested in equity-method investments Payments to Acquire Debt Securities, Available-for-Sale Purchases of pledged available-for-sale ("AFS") securities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Proceeds from prepayment and sale of pledged AFS securities Payment for Acquisition, Loan, Held-for-Investment Originations and repurchase of loans held for investment Proceeds from Principal Repayment, Loan and Lease, Held-for-Investment Principal collected on loans held for investment Payments for (Proceeds from) Other Investing Activities Other investing activities, net Net Cash Provided by (Used in) Investing Activities Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Cash flows from financing activities Proceeds from (Repayments of) Lines of Credit Borrowings (repayments) of warehouse notes payable, net Repayments of Long-Term Lines of Credit Repayments of interim warehouse notes payable Repayments of Notes Payable Repayments of corporate notes payable Repayments of notes payable Proceeds from Notes Payable Borrowings of corporate notes payable Payments for Repurchase of Common Stock Repurchase of common stock Payments of Ordinary Dividends, Common Stock Cash dividends paid Payment for Contingent Consideration Liability, Financing Activities Payment of contingent consideration Payments to Noncontrolling Interests Purchase of noncontrolling interests Payments of Debt Issuance Costs Debt issuance costs Proceeds from (Payments for) Other Financing Activities Other financing activities, net Net Cash Provided by (Used in) Financing Activities Net cash provided by (used in) financing activities Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Net increase (decrease) in cash, cash equivalents, restricted cash, and restricted cash equivalents (NOTE 2) Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Total of cash, cash equivalents, restricted cash, and restricted cash equivalents at end of period Cash, cash equivalents, restricted cash, and restricted cash equivalents at beginning of period Total cash, cash equivalents, restricted cash, and restricted cash equivalents Supplemental Cash Flow Information [Abstract] Supplemental Disclosure of Cash Flow Information: Interest Paid, Excluding Capitalized Interest, Operating Activities Cash paid to third parties for interest Income Taxes Paid, Net Cash paid for income taxes, net of cash refunds received Income taxes paid ORGANIZATION Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] ORGANIZATION SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES MORTGAGE SERVICING RIGHTS Servicing Asset at Amortized Cost [Table] Servicing Asset at Amortized Cost [Table] Financial Instrument [Axis] Financial Instruments [Domain] Servicing Contracts [Member] MSRs Servicing Asset at Amortized Cost [Line Items] MORTGAGE SERVICING RIGHTS SERVICING