Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Weighted average number of common shares outstanding (1) Shares for basic and diluted calculations Weighted Average Number of Shares Outstanding, Diluted [Abstract] Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum [Member] Statistical Measurement [Domain] Statistical Measurement [Domain] Short-term Debt, Type [Axis] Short-Term Debt, Type [Axis] Fixed income securities Fixed income securities Financial Instruments, Owned, Corporate Debt, at Fair Value Title of Each Class Title of 12(b) Security Subsequent Event Subsequent Event [Member] Document Fiscal Year Focus Document Fiscal Year Focus Investment income/(loss) Investment income (loss) Includes realized and unrealized gains (losses) recorded on the Company's merchant banking and other firm investments. Additionally includes mgmt fees on the Company's internally managed funds. Payment Date [Axis] Payment Date [Axis] Payment Date Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Derivative liability contracts - counterparty and cash collateral netting Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset Adjustment to Compensation, Amount Adjustment to Compensation Amount Pledged Status [Axis] Pledged Status [Axis] Unvested Restricted Stock or Stock Units Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Segment Reporting [Abstract] Segment Reporting [Abstract] Common stock, $0.01 par value: Shares authorized: 400,000,000; Shares issued: 78,120,833 and 78,250,916, respectively; Shares outstanding: 67,857,561 and 67,483,432, respectively Common Stock, Value, Issued Grant requisite service period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period Loss Contingency Accrual Loss Contingency Accrual Restatement Determination Date Restatement Determination Date Derivative asset contracts - counterparty and collateral netting Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash, Offset Against Derivative Asset Grant Year 2022 Grant Year 2022 [Member] Grant Year 2022 Accrued compensation Employee-related Liabilities Fund capital contributions/(distributions), net Noncontrolling Interest Increase (Decrease) From Capital Contributions (net of withdrawals) Amount of increase/(decrease) in noncontrolling interest from capital contributions, net of withdrawals. 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Other operating expenses Other Noninterest Expense Equity securities Equity securities Financial Instruments Sold, Not yet Purchased, Corporate Equities Measurement Frequency [Axis] Measurement Frequency [Axis] Amendment Flag Amendment Flag Consolidated Entities [Axis] Consolidated Entities [Axis] Average price per share of shares repurchased pursuant to repurchase authorizations (in dollars per share) Shares Acquired, Average Cost Per Share Schedule of Gross Fair Market Value and Total Absolute Notional Contract Amount Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Receivable from brokers and dealers Due from Correspondent Brokers Statement [Table] Reclassification [Table] Loss Contingencies [Table] Loss Contingencies [Table] Investment [Domain] Investments [Domain] Other comprehensive income/(loss), net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Premium over the MMD curve Measurement Input, Credit Spread [Member] Deferred income taxes Increase (Decrease) in Deferred Income Taxes Consolidated Entities [Domain] Consolidated Entities [Domain] One unnamed financial institutional not required to post collateral One unnamed financial institutional not required to post collateral [Member] One unnamed financial institutional that is a party of derivative contracts and not required to post collateral. Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Transfers in Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Entity Address, State or Province Entity Address, State or Province Service Requirement [Axis] Service Requirement [Axis] Service Requirement U.S. Bank N.A. U.S. Bank N.A. [Member] U.S. Bank N.A. Issuance of treasury shares for restricted stock vestings Adjustments for Stock Issued During Period, Value, Treasury Stock Reissued, Restricted Stock Vestings Equity impact of the value of treasury stock reissued during the period to satisfy equity-based compensation obligations related to restricted stock vestings. 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Accounting Standards Update [Axis] Accounting Standards Update [Axis] Number of reportable segments Number of Reportable Segments Customer relationships Customer Relationships [Member] Short-term Debt, Type [Domain] Short-Term Debt, Type [Domain] Entity Address, City or Town Entity Address, City or Town Concentration of Credit or Market Risk [Axis] Concentration of Credit or Market Risk [Axis] Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Share-based Compensation Arrangement by Share-based Payment Award Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Receivable [Domain] Receivable [Domain] Level II Fair Value, Inputs, Level 2 [Member] Accumulated amortization on intangible assets Intangible Asset, Finite-Lived, Accumulated Amortization Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Available bank line financing Line of credit, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Other comprehensive income/(loss) Other Comprehensive Income (Loss), Net of Tax Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Table] Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Table] Fair Value, Assets And Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Dividends [Domain] Dividends [Domain] Payable to brokers and dealers Due to Correspondent Brokers Subsequent Event Type [Axis] Subsequent Event Type [Axis] Aviditi Advisors Aviditi Advisors [Member] Aviditi Advisors Inducement grants Inducement Grant [Member] Inducement Grant Fair Value, Concentration of Risk [Table] Fair Value, Concentration of Risk [Table] New Accounting Pronouncements or Change in Accounting Principle New Accounting Pronouncements or Change in Accounting Principle [Line Items] Transfers in Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3 Reportable Segment Financial Results Segment Reporting [Table Text Block] Noncontrolling Interests Investments attributable to noncontrolling interests Noncontrolling Interest [Member] Financial instruments and other inventory positions owned Total financial instruments and other inventory positions owned Financial Instruments, Owned, at Fair Value Related Party, Type [Axis] Related and Nonrelated Parties [Axis] Short-term securities Financial Instruments, Owned, Municipal Notes, at Fair Value The fair value as of the balance sheet date of firm holdings in short-term debt securities issued by state, city or local governments or the agencies operated by state, city or local governments. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. O2026Q2Dividends O2026Q2Dividends [Member] O2026Q2Dividends Intangible assets Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill Document Period End Date Document Period End Date Average price per share of shares repurchased from employees related to employment tax obligations (in dollars per share) Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation, Average Price Per Share Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation, Average Price Per Share Financial instruments and other inventory positions owned Financial Instruments And Other Inventory Positions Owned [Member] Primary financial statement caption encompassing financial instruments and other inventory positions owned. Schedule Of Compliance With Regulatory Capital Requirements For Broker Dealer Schedule Of Compliance With Regulatory Capital Requirements For Broker Dealer [Line Items] Schedule Of Compliance With Regulatory Capital Requirements For Broker Dealer [Line Items] Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Vesting Year 2025 Vesting Year 2025 [Member] Vesting Year 2025 Financial instruments and other inventory positions owned Financial Instruments Owned and Pledged as Collateral [Abstract] Shareholders' Equity Equity [Text Block] Earnings per common share (1) Earnings per common share Earnings Per Share, Basic [Abstract] Investments, All Other Investments [Abstract] Investments, All Other Investments [Abstract] Security Exchange Name Security Exchange Name Less: Common stock held in treasury, at cost: 10,263,272 shares and 10,767,484 shares, respectively Treasury Stock, Common, Value Financial Instruments and Other Inventory Positions Sold, But Not Yet Purchased [Domain] Financial Instruments and Other Inventory Positions Sold, But Not Yet Purchased [Domain] Financial Instruments and Other Inventory Positions Sold, But Not Yet Purchased [Domain] Granted (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Securities posted as collateral Derivative, Fair Value of Securities Posted as Collateral Fair value of securities pledged as collateral against derivatives. Accounting Standards Update 2024-03 Accounting Standards Update 2024-03 [Member] Huntington Bancshares Incorporated Huntington Bancshares Incorporated [Member] Huntington Bancshares Incorporated Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Sign-on grants Sign On Grant [Member] Sign on Grant [Member] Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Total realized and unrealized gains/(losses) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Equity award grants authorized (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Award Terms [Axis] Award Terms [Axis] Terms specific to the award vesting percentage, as defined in the award agreement. Equity securities subject to contractual sale restrictions Equity Security, FV-NI, Contractual Sale Restriction Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract] Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Earnings Per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Earnings Per Share [Abstract] Earnings Per Share [Abstract] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Deferred Bonus and Profit Sharing Arrangements, Individual Contracts, Type of Deferred Compensation [Axis] Deferred Bonus and Profit Sharing Arrangements, Individual Contracts, Type of Deferred Compensation [Axis] Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Total liabilities Total liabilities Liabilities Trading Symbol Trading Symbol Discount rate Measurement Input, Discount Rate [Member] Financial instruments and other inventory positions sold, but not yet purchased Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] Transfers out Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3 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] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Company Selected Measure Name Company Selected Measure Name Award Date [Axis] Award Date [Axis] Business Combination, Contingent Consideration, Type [Axis] Business Combination, Contingent Consideration, Type [Axis] Unrealized gains/(losses) on derivative instruments Unrealized Gain (Loss) on Derivatives Earnings Per Share, Basic, by Common Class, Including Two Class Method Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Asset Class [Domain] Asset Class [Domain] Receivables from brokers, dealers and clearing organizations Receivable from Broker-Dealer and Clearing Organization [Abstract] Operating Activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Equity securities Financial Instruments, Owned, Corporate Equities, at Fair Value Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Receivable from clearing organizations Receivables from Clearing Organizations Diluted (in shares) Average shares used in diluted computation (in shares) Weighted Average Number of Shares Outstanding, Diluted Cash dividends paid (amount per share) Common Stock, Dividends, Per Share, Cash Paid Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Second Quarter 2026 Second Quarter 2026 [Member] Second Quarter 2026 Other assets Related Party Transaction [Line Items] Transfers out Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Items Included in Consolidated Statement of Financial Condition [Abstract] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Restricted Equity Award Type [Axis] Restricted Equity Award Type [Axis] Restricted Equity Award Type [Axis] Dividends declared Dividends Customer matched-book Customer Matched Book [Member] Derivative contracts in which the reporting entity acts as a dealer to satisfy the financial needs of its customers. Generally, the reporting entity simultaneously enters into a derivative contract with a third party for the same notional amount to hedge the interest rate and credit risk of the initial contract. Uncollateralized credit exposure Fair Value, Concentration of Risk, Derivative Instruments, Assets Payout leverage, percentage Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage Award Date [Domain] Award Date [Domain] Goodwill, amount expected to be deductible for income tax purposes Business Combination, Goodwill, Expected Tax Deductible, Amount Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Prepaid expenses Prepaid Expense Short-term financing Short-Term Debt Variable interest entities, exposure to loss Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Derivative Liabilities Derivative Liability, Subject to Master Netting Arrangement, before Offset Receivables from and Payables to Brokers, Dealers and Clearing Organizations Due to and from Broker-Dealers and Clearing Organizations Disclosure [Text Block] Forgivable employee loans Other Receivables Tax Benefit Recorded As a Result of Stock Option Exercises Share-Based Payment Arrangement, Exercise of Option, Tax Benefit Trade execution and clearance Floor Brokerage, Exchange and Clearance Fees Award Timing Predetermined Award Timing Predetermined [Flag] Treasury Stock Treasury Stock, Common [Member] Aggregate Intrinsic Value of Stock Options Exercised Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value S2025ADividends S2025ADividends [Member] S2025ADividends Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Amortization/issuance of restricted stock (2) APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Level I Fair Value, Inputs, Level 1 [Member] Other Other Assets, Miscellaneous Financial instruments and other inventory positions sold, but not yet purchased Total financial instruments and other inventory positions sold, but not yet purchased Financial Instruments Sold, Not yet Purchased, at Fair Value Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Investments (including noncontrolling interests of $205,069 and $216,838, respectively) Total investments Investments Investments, Excluding Financial Instruments Owned Investments, excluding financial instruments owned. Notional contract amount Derivative Asset, Notional Amount Dilutive impact of securities (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Issuance of Shares [Abstract] Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract] Beginning Balance (in dollars per share) Ending Balance (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Award Terms [Domain] Award Terms [Domain] [Domain] for Terms specific to the award vesting percentage, as defined in the award agreement. All Executive Categories All Executive Categories [Member] Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] The Valence Group The Valence Group [Member] The Valence Group [Member] Interest rate locks Interest Rate Lock Commitments [Member] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Preferred Stock, Par or Stated Value Per Share Preferred Stock, Par or Stated Value Per Share Depreciation and amortization of fixed assets Depreciation Vesting [Domain] Vesting [Domain] Plan Name [Domain] Plan Name [Domain] Scenario [Domain] Scenario [Domain] Stock Repurchase Program Effective Date Stock Repurchase Program Effective Date Stock Repurchase Program Effective Date Beginning Balance (in dollars per share) Ending Balance (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Right-of-use lease assets Operating Lease, Right-of-Use Asset Schedule of Maximum Payout Leverage for Leadership Grants Schedule of Share-based Payment Award, Equity Instruments Other Than Options, Maximum Payout Leverage [Table Text Block] Schedule of Share-based Payment Award, Equity Instruments Other Than Options, Maximum Payout Leverage Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements No service requirement No service requirement [Member] No service requirement Accounting Changes and Error Corrections [Abstract] Computation of Earnings per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Number of years risk free interest rate Number of years risk free interest rate Number of years risk free interest rate Debt Disclosure [Abstract] Debt Disclosure [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Business Segment and Revenues Information Segment Reporting [Text Block] 18 Month Period 18 Month Vesting Period [Member] 18 Month Vesting Period [Member] Minimum Minimum [Member] Minimum net capital requirement Broker-Dealer, Minimum Net Capital Required, Alternative Standard Investment [Axis] Investment Type [Axis] Payment of cash dividends Payments of Ordinary Dividends, Common Stock Expiration Date Trading Arrangement Expiration Date Schedule of Expected Payout Leverage for Performance Condition RSUs Schedule of Share-based Payment Award, Equity Instruments Other Than Options, Performance Condition [Table Text Block] Schedule of Share-based Payment Award, Equity Instruments Other Than Options, Performance Condition Share-Based Compensation Arrangement by Share-Based Payment Award, Additional General Disclosures Share-Based Compensation Arrangement by Share-Based Payment Award, Additional General Disclosures [Abstract] Liabilities Liabilities [Abstract] Variable Interest Entities Variable Interest Entity Disclosure [Text Block] Income Statement Location [Axis] Location, Statement of Income, Balance [Axis] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Total shareholders' equity Beginning Balance Ending Balance Equity, Including Portion Attributable to Noncontrolling Interest Amortization of forgivable loans Amortization Of Loans To Employees The amount of expense recognized in the current period that related to forgivable loans issued to revenue-producing employees, typically in connection with their recruitment. Weighted Average Remaining Contractual Term of Stock Options Outstanding (in Years) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted-Average Remaining Contractual Term 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] Derivative asset contracts, measurement input Derivative Asset, Measurement Input Derivative contracts Derivative [Member] Business Combination Business Combination [Line Items] Number of Exercisable Options (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number Dividends [Abstract] Dividends [Abstract] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Derivative [Table] Derivative [Table] Schedule of Market Condition RSU Valuation Assumptions Schedule of Share-based Payment Award, Equity Instruments Other Than Options, Valuation Assumptions [Table Text Block] Schedule of Share-based Payment Award, Equity Instruments Other Than Options, Valuation Assumptions Common stock, shares authorized (in shares) Common Stock, Shares Authorized Common Stock, Shares Authorized Advisory services Advisory Services [Member] Advisory Services [Member] Plan Assets Deferred Compensation Plan Assets Changes in Unvested Restricted Stock Units Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] Exercise Price Award Exercise Price Reissuance of treasury shares as a result of employee vesting and exercise transactions (in shares) Stock Issued During Period, Shares, Treasury Stock Reissued Share Based Compensation Net of Shares Paid for Tax Withholding Number of treasury shares reissued during the period for share-based compensation plans, net of the number of shares withheld to satisfy tax withholding requirements. Investing Activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Measured on a recurring basis Fair Value, Recurring [Member] Incentive Plan Amended And Restated 2003 Annual And Long Term Incentive Plan [Member] Amended And Restated 2003 Annual And Long Term Incentive Plan [Member] Segment Reporting Segment Reporting [Line Items] Stock Repurchase Program, Authorized Amount Share Repurchase Program, Authorized, Amount Unrecognized compensation cost related to equity awards Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Document Quarterly Report Document Quarterly Report 2020 Inducement Plan 2020 Employment Inducement Award Plan [Member] 2020 Employment Inducement Award Plan [Member] 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] Segments [Domain] Segments [Domain] Issuance of treasury shares for restricted stock vestings (in shares) Stock Issued During Period, Shares, Treasury Stock Reissued Restricted Stock Vestings Number of treasury shares reissued during the period to satisfy equity-based compensation obligations related to restricted stock vestings. Lender Name [Axis] Lender Name [Axis] Effect of exchange rate changes on cash Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation Share-Based Payment Arrangement, Additional Disclosure Share-Based Payment Arrangement, Additional Disclosure [Abstract] Scenario [Axis] Scenario [Axis] Equity brokerage Equity Sales and Trading [Member] Ownership interest or right to acquire or dispose of ownership interest in corporations and other legal entities for which ownership interest is represented by shares of common or preferred stock, convertible securities, stock rights, or stock warrants. Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Investments accounted for under the equity method Equity Method Investments Business Combination [Table] Business Combination [Table] Equity Component [Domain] Equity Component [Domain] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Measurement Input Type [Domain] Measurement Input Type [Domain] Total realized and unrealized gains/(losses) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Service requirement Service Requirement [Member] Service Requirement Adoption Date Trading Arrangement Adoption Date Cash dividends paid Dividends, Common Stock, Cash Counterparty Name Counterparty Name [Domain] Total common shareholders' equity Equity, Attributable to Parent Payables to brokers, dealers and clearing organizations Total payables to brokers, dealers and clearing organizations Broker-Dealer, Payable to Other Broker-Dealer and Clearing Organization Value of restricted stock granted Shares Granted During Period, Value, Share-based Compensation The value of shares issued as part of share-based compensation arrangements. Share Repurchases [Abstract] Payments for Repurchase of Equity [Abstract] Schedule of Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits, by Title of Individual and by Type of Deferred Compensation [Table] Deferred Compensation Arrangement with Individual, Excluding Share-Based Payment and Postretirement Benefit [Table] Assets Assets [Abstract] EBITDA multiple Measurement Input, EBITDA Multiple [Member] Receivables from brokers, dealers and clearing organizations Total receivables from brokers, dealers and clearing organizations Receivable from Broker-Dealer and Clearing Organization Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Accounting Policies [Abstract] Accounting Policies [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Risk-free interest rate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Accrued lease liabilities Operating Lease, Liability Occupancy and equipment Professional Fees Insider Trading Policies and Procedures [Line Items] Stock options (in shares) Beginning Balance (in shares) Ending Balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Share Repurchase Program Authorized February 5, 2025 Share Repurchase Program Authorized February 5, 2025 [Member] Share Repurchase Program Authorized February 5, 2025 Interest income Interest Income, Operating Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Derivative Instruments, Gain (Loss) Derivative Instruments, Gain (Loss) [Line Items] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Schedule of Error Corrections and Prior Period Adjustments Schedule of Error Corrections and Prior Period Adjustments [Table Text Block] Business Combination [Domain] Business Combination [Domain] Legal Contingencies Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Annual grant expense period Share based compensation expense period Share based compensation expense period Restricted stock units Restricted Stock Units (RSUs) [Member] Trading securities Trading Securities Derivative Contract [Member] Derivative contracts in which the reporting entity hedges the interest rate and other market value risks associated with its fixed income securities, convertible securities, and asset-backed securities. Entity Central Index Key Entity Central Index Key Weighted Average Weighted Average [Member] Accumulated depreciation and amortization on fixed assets Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization Additional paid-in capital Additional Paid in Capital, Common Stock All Adjustments to Compensation All Adjustments to Compensation [Member] Business Combination [Axis] Business Combination [Axis] Equity [Abstract] Equity [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] Net cash used in operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Fiscal Year 2025 Fiscal Year 2025 [Member] Fiscal Year 2025 Schedule of Receivables from and Payables to Brokers, Dealers and Clearing Organizations Schedule of Due to (from) Broker-Dealer and Clearing Organization [Table Text Block] Pledging Purpose [Domain] Pledging Purpose [Domain] Income Statement [Abstract] Income Statement [Abstract] Annual MFRS Awards Annual Mutual Fund Restricted Shares [Member] The Piper Jaffray Companies Mutual Fund Restricted Share Investment Plan (MFRS), a deferred compensation plan which allows eligible employees to elect to receive a portion of the incentive compensation they would otherwise receive in the form of restricted stock, instead in MFRS Award of registered funds managed by the reporting entity's asset management business. Pledging Purpose [Axis] Pledging Purpose [Axis] Document Transition Report Document Transition Report Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Sandler O'Neill Sandler O'Neill [Member] Sandler O'Neill [Member] Contractual Sales Restriction Effective Period [Axis] Contractual Sales Restriction Effective Period [Axis] Contractual Sales Restriction Effective Period Net deferred income tax assets Deferred Income Tax Assets, Net Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Schedule of Stock Options Valuation Assumptions Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Tax-exempt securities Financial Instruments, Owned, Nontaxable Municipal Bonds, at Fair Value The fair value as of the balance sheet date of firm holdings in long-term debt securities issued by state, city or local governments or the agencies operated by state, city or local governments that are not taxable. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. Options Outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Stock Repurchase Program Expiration Date Share Repurchase Program, Expiration Date City Area Code City Area Code Restricted stock Restricted Stock [Member] Accumulated Other Comprehensive Income/(Loss) AOCI Attributable to Parent [Member] Financial Instruments and Other Inventory Positions Owned [Axis] Financial Instruments and Other Inventory Positions Owned [Axis] Primary financial statement caption encompassing financial instruments and other inventory positions owned. All Individuals All Individuals [Member] Investments at fair value Financial Instruments, Owned, Principal Investments, at Fair Value Name Forgone Recovery, Individual Name Fair Value, Concentration of Risk, Financial Statement Captions Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Weighted average period over which equity award expense expected to be recognized Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Previously Reported Previously Reported [Member] Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Weighted Average Grant Date Fair Value (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Statement Statement [Line Items] Total assets Total assets Assets Business Combination [Abstract] Business Combination [Abstract] Variable Interest Entity, Not Primary Beneficiary Variable Interest Entity, Not Primary Beneficiary [Member] Settlement for CA VRDN Settlement for CA VRDN [Member] Settlement for CA VRDN Currency adjustment: Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation [Abstract] Fair value of options granted (per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Schedule of Stock-Based Compensation Expense Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Compensation Plans Share-Based Payment Arrangement [Text Block] Other assets Increase (Decrease) in Other Operating Assets Outside services Occupancy, Net PEO PEO [Member] Beginning Balance (in shares) Ending Balance (in shares) Shares, Outstanding Expired (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Measurement Input, Recent Round of Independent Financing Measurement Input, Recent Round of Independent Financing [Member] Measurement Input, Recent Round of Independent Financing Stock-based compensation expense Share-Based Payment Arrangement, Expense Equity value as multiple of independent financing value Measurement Input, Equity Value as Multiple of Independent Financing Value [Member] Measurement Input, Equity Value as Multiple of Independent Financing Value Net Capital Requirements and Other Regulatory Matters Broker-Dealer Disclosure [Text Block] Three Year Period Three Year Vesting Period [Member] Three Year Period [Member] Goodwill Goodwill Contractual Sales Restriction Effective Period [Domain] Contractual Sales Restriction Effective Period [Domain] Contractual Sales Restriction Effective Period [Domain] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Goodwill acquired Goodwill, Acquired During Period Issuance of treasury shares for options exercised (in shares) Exercised (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Granted (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Municipal financing Debt Financing [Member] Financing through issuance of security instrument that represents a creditor relationship with the holder of the investment security. Subsequent Event Type [Domain] Subsequent Event Type [Domain] Payment Date [Domain] Payment Date [Domain] Payment Date [Domain] Retained Earnings Retained Earnings [Member] Revolving credit facility Revolving Credit Facility [Member] Revision of Prior Period [Domain] Revision of Prior Period [Domain] Canceled (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Three unnamed financial institution counterparties not required to post collateral Three counterparties not required to post collateral [Member] Financial institutions that are counterparties to derivative contracts and not required to post collateral. Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Canceled (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period Information about Significant Unobservable Inputs used in Fair Value Measurement Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Diluted Earnings Per Share, Diluted Entity Current Reporting Status Entity Current Reporting Status Net cash used in financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Repurchase of common stock from employees Aggregate purchase price of shares repurchased from employees related to employment tax obligations Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Pershing clearing arrangement Pershing clearing arrangement [Member] Pershing clearing arrangement Liabilities Liabilities, Fair Value Disclosure [Abstract] Accrued compensation Increase (Decrease) in Employee Related Liabilities Intangible asset amortization Amortization of intangible assets Intangible Asset, Finite-Lived, Amortization Expense Derivative Category [Axis] Derivative Category [Axis] Information by category of derivative contract. Installment fee receivables Financing Receivable [Member] Fixed income securities Fixed income securities Financial Instruments Sold, Not yet Purchased, Corporate Debt Brokers and Dealers [Abstract] Broker-Dealer [Abstract] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Total revenues from contracts with customers Revenue from Contract with Customer, Excluding Assessed Tax Financing Activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Fixed assets (net of accumulated depreciation and amortization of $93,979 and $89,312, respectively) Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Expiring in first quarter of 2027 Expiring in first quarter of 2027 [Member] Expiring in first quarter of 2027 Summary of the Company's Repurchase Activity Schedule of Stockholders Equity [Table Text Block] Asset-backed securities Financial Instruments, Owned, Mortgages, Mortgage-Backed and Asset-Backed Securities, at Fair Value DBO Partners DBO Partners [Member] DBO Partners Grant Year 2023 Grant Year 2023 [Member] Grant Year 2023 Intangible Asset, Finite-Lived, Class [Axis] Intangible Asset, Finite-Lived, Class [Axis] Issuance of treasury shares for options exercised Stock Issued During Period, Value, Stock Options Exercised Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Underlying Securities Award Underlying Securities Amount Comprehensive income/(loss) attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Excess net capital Broker-Dealer, Excess Net Capital, Alternative Standard Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Cancelled (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Award Vesting Period Deferred Compensation Arrangement Award Vesting Period Period over which an employee's award vests. Variable Interest Entity, Not Primary Beneficiary, Disclosures [Abstract] Variable Interest Entity, Not Primary Beneficiary, Disclosures [Abstract] Financial Instruments and Other Inventory Positions Owned and Financial Instruments and Other Inventory Positions Sold, but Not Yet Purchased Financial Instruments Disclosure [Text Block] Changes in Fair Value Associated with Level III Financial Instruments Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Text Block] Tabular disclosure of the fair value measurement of assets and liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized); (2) purchases and sales; and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of asset or liability. Increase in noncontrolling interests Proceeds from (Payments to) Noncontrolling Interests Changes in Unvested Restricted Stock Nonvested Restricted Stock Shares Activity [Table Text Block] Shares available for future issuance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Segment Reporting [Table] Segment Reporting [Table] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Beginning balance Ending balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Vesting Year 2026 Vesting Year 2026 [Member] Vesting Year 2026 Current Fiscal Year End Date Current Fiscal Year End Date Deferred Bonus and Profit Sharing Arrangement, Individual Contract, Type of Deferred Compensation [Domain] Deferred Bonus and Profit Sharing Arrangement, Individual Contract, Type of Deferred Compensation [Domain] Investments Increase (Decrease) in Investments, Excluding Financial Instruments Owned The increase (decrease) during the period in the net carrying value of investments excluding financial instruments owned. Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Derivative Derivative [Line Items] Payables to brokers, dealers and clearing organizations Broker-Dealer, Payable to Other Broker-Dealer and Clearing Organization [Abstract] Acquisitions Business Combination [Text Block] Communications Communications and Information Technology 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] Dividends declared per common share Common Stock, Dividends, Per Share, Declared Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Net change in short-term financing Repayment of short-term debt Proceeds from (Repayments of) Short-Term Debt Excess net capital required Debt Instrument, Covenant Compliance, Excess Net Capital Requirement The amount of excess net capital which the reporting entity's U.S. broker dealer subsidiary is required to maintain in order to maintain compliance with the debt instrument. Changes in Outstanding Stock Options Share-Based Payment Arrangement, Option, Activity [Table Text Block] Weighted Average Exercise Price (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Expected Payout Leverage Pro Forma [Member] Common stock, shares issued (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Beginning balance Ending balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Schedule of Consolidated Variable Interest Entities Schedule of Variable Interest Entities [Table Text Block] Other Assets Other Assets Disclosure [Text Block] Common stock held in treasury, shares (in shares) Treasury Stock, Common, Shares Revision of Prior Period, Adjustment Revision of Prior Period, Adjustment [Member] Financial Instruments Owned and Sold, Not yet Purchased [Abstract] Financial Instruments Owned and Sold, Not yet Purchased [Abstract] Financial Instruments Owned and Sold, Not yet Purchased Net financial instruments and other inventory positions owned Increase (Decrease) in Financial Instruments Used in Operating Activities Equity Components [Axis] Equity Components [Axis] Product and Service [Domain] Product and Service [Domain] Fiscal Year [Axis] Fiscal Year [Axis] Fiscal Year Entity Interactive Data Current Entity Interactive Data Current Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Net income/(loss) attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Plan Liabilities Deferred Compensation Liability, Current and Noncurrent Non-interest expenses Noninterest Expense [Abstract] Variable Interest Entity Variable Interest Entity [Line Items] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Interest expense Other Interest Expense Amount of the cost of borrowed funds and interest expense related to cash instruments, collateralized securities transactions, borrowings and other financial liabilities. Unrealized gains/(losses) for assets/(liabilities) held at period end Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) Entity Small Business Entity Small Business Second Quarter 2025 Second Quarter 2025 [Member] Second Quarter 2025 Comprehensive income attributable to Piper Sandler Companies Comprehensive Income (Loss), Net of Tax, Attributable to Parent Investments at fair value Other Investments at Fair Value Investments not included in financial instruments owned that are carried at fair value. Examples may include, investments in private companies and partnerships, registered mutual funds, warrants of public and private companies and private company debt. Termination Date Trading Arrangement Termination Date Repurchase of common stock from employees (in shares) Common shares repurchased from employees related to employment tax obligations (in shares) Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Performance Condition Performance Condition [Member] Performance Condition Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Grant Type [Axis] Grant Type [Axis] Grant Type [Axis] Stockholders' Equity Note, Stock Split, Conversion Ratio Stockholders' Equity Note, Stock Split, Conversion Ratio MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Term of stock options Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Document Type Document Type Business acquisitions, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Fair Value as of Grant Date Award Grant Date Fair Value Market Condition Market Condition [Member] Market Condition Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Earnings Per Share, Basic, by Common Class, Including Two-Class Method [Table] Aggregate Intrinsic Value of Options Exercisable Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Stock Repurchase Program, Remaining Authorized Repurchase Amount Share Repurchase Program, Remaining Authorized, Amount Arrangement Duration Trading Arrangement Duration Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Grant Year 2026 Grant Year 2026 [Member] Grant Year 2026 Financial Instruments Owned and Pledged as Collateral [Table] Financial Instruments Owned and Pledged as Collateral [Table] Local Phone Number Local Phone Number Forfeitures Restricted Stock Award, Forfeitures Amount paid related to contingent consideration liability Payment for Contingent Consideration Liability, Operating Activities Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Payable to clearing organizations Commission Payable to Broker-Dealer and Clearing Organization Decrease/(increase) in operating assets: Increase (Decrease) in Operating Assets [Abstract] Income before income tax expense/(benefit) Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Pledged Status [Domain] Pledged Status [Domain] Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Total revenues Revenues Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Accounting Standards Update and Change in Accounting Principle [Table] Accounting Standards Update and Change in Accounting Principle [Table] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] Receivable Type [Axis] Receivable Type [Axis] Increase/(decrease) in operating liabilities: Increase (Decrease) in Operating Liabilities [Abstract] Net revenues Revenues, Net of Interest Expense Award vesting period in years Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Expired (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period Counterparty Name [Axis] Counterparty Name [Axis] Liabilities and Shareholders' Equity Liabilities and Equity [Abstract] Asset Not Pledged as Collateral Asset Not Pledged as Collateral [Member] Intangible Asset, Finite-Lived, Class [Domain] Intangible Asset, Finite-Lived, Class [Domain] Weighted Average Remaining Contractual Term for Options Exercisable Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted-Average Remaining Contractual Term U.S. government agency securities Financial Instruments, Owned, US Gov't and Agency Obligations, at Fair Value The fair value as of the balance sheet date of firm holdings in debt issued by US Government Corporations and Agencies. Investments in such US Government Corporations may include debt securities issued by the Government National Mortgage Association (Ginnie Mae) and by the Federal National Mortgage Association (Fannie Mae) and the Federal Home Loan Mortgage Corporation (Freddie Mac). Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. Valuation of Financial Instruments by Pricing Observability Levels Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Award Type [Domain] Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Schedule of Variable Interest Entities [Table] Variable Interest Entity [Table] Revenue multiple Measurement Input, Revenue Multiple [Member] Level III Fair Value, Inputs, Level 3 [Member] 2024 Inducement Plan 2024 Employment Inducement Award Plan [Member] 2024 Employment Inducement Award Plan Supplemental Cash Flow Information [Abstract] Asset Pledged as Collateral Asset Pledged as Collateral [Member] Service Requirement [Domain] Service Requirement [Domain] Service Requirement [Domain] Expected life of options (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term Repurchase of common stock through share repurchase program (in shares) Common shares repurchased pursuant to repurchase authorizations (in shares) Treasury Stock, Shares, Acquired Restricted stock and restricted stock units (RSUs) Restricted stock and restricted stock units (RSUs) [Member] Restricted stock and restricted stock units (RSUs) PEO Name PEO Name Other liabilities and accrued expenses Accrued Liabilities and Other Liabilities Restricted stock related to compensation plans Restricted stock related to compensation plans [Member] Restricted stock related to compensation [Member] Taxable securities Taxable securities Financial Instruments, Owned, Taxable Municipal Bonds, at Fair Value The fair value as of the balance sheet date of firm holdings in long-term debt securities issued by state, city or local governments or the agencies operated by state, city or local governments that are taxable. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. Schedule of Short-term Debt [Table] Short-Term Debt [Table] Other assets Total other assets Other Assets Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Grant Year 2018 Grant Year 2018 [Member] Grant Year 2018 Liability Class [Axis] Liability Class [Axis] Tax benefit related to stock-based compensation expense Share-Based Payment Arrangement, Expense, Tax Benefit Repurchase of common stock through share repurchase program Aggregate purchase price of shares repurchased pursuant to repurchase authorizations Treasury Stock, Value, Acquired, Cost Method Exercised (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Cash and cash equivalents Cash and cash equivalents at beginning of year Cash and cash equivalents at end of year Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Five Year Period Five Year Vesting Period [Member] Five Year Vesting Period [Member] Net capital Broker-Dealer, Net Capital Grant Year 2025 Grant Year 2025 [Member] Grant Year 2025 Fixed income services Fixed Income Sales and Trading [Member] Debt instrument issued by corporations, governments and governmental agencies, municipalities, and other institutions. Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Due to and from Broker-Dealers and Clearing Organizations [Abstract] Due to and from Broker-Dealers and Clearing Organizations [Abstract] Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Investments attributable to noncontrolling interests Less: Investments attributable to noncontrolling interests Investments Attributable to Noncontrolling Interest Investments Attributable to Noncontrolling Interest 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] Organization and Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Measurement Frequency [Domain] Measurement Frequency [Domain] Debt Instrument [Axis] Debt Instrument [Axis] O2026Q1Dividends O2026Q1Dividends [Member] O2026Q1Dividends Stock-based compensation Share-Based Payment Arrangement, Noncash Expense Compensation and benefits Labor and Related Expense Net revenue target Net revenue target [Member] Net revenue target [Member] Convertible securities Financial Instruments, Owned, Convertible Debt Securities, at Fair Value The fair value as of the balance sheet date of firm holdings in debt securities that can be exchanged for equity of the debt issuer at the option of the issuer or the holder. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. Short-term Debt Short-Term Debt [Member] Basic Earnings Per Share, Basic Equity, Class of Treasury Stock Equity, Class of Treasury Stock [Line Items] Measurement Input Type [Axis] Measurement Input Type [Axis] Summary of Outstanding Equity Awards Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block] Repurchase of common stock Payments for Repurchase of Common Stock U.S. government securities Financial Instruments, Owned, US Treasury Securities, at Fair Value The fair value as of the balance sheet date of firm holdings in debt securities issued by the United States Department of the Treasury and backed by the United States government. Such securities primarily consist of treasury bills (short-term maturities - one year or less), treasury notes (intermediate term maturities - two to ten years), and treasury bonds (long-term maturities - ten to thirty years). Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Restricted Equity Award Type [Domain] Restricted Equity Award Type [Domain] Restricted Equity Award Type [Domain] Corporate financing Equities Financing [Member] Financing through issuance of security instrument that represents an ownership relationship with the holder of the investment security. Investment banking Total investment banking Investment Banking Revenue Unrealized Gains/(Losses) on Derivative Instruments Derivative Instruments, Gain (Loss) [Table Text Block] 2022 Inducement Plan 2022 Employment Inducement Award Plan [Member] 2022 Employment Inducement Award Plan Award Type [Axis] Award Type [Axis] Institutional brokerage Total institutional brokerage Institutional Brokerage Revenue Includes (1) commissions received from customers for the execution of brokerage transactions in over-the-counter equity, fixed income and convertible debt securities; (2) trading gains and losses; and (3) fees received for equity research. Interest rate derivate contract Interest Rate Contract [Member] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Summary of Repurchase Programs Authorized by the Company's Board of Directors Class of Treasury Stock [Table Text Block] Retained earnings Retained Earnings (Accumulated Deficit) Product and Service [Axis] Product and Service [Axis] Vesting Year 2028 Vesting Year 2028 [Member] Vesting Year 2028 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] Investments Investments, Excluding Financial Instruments [Text Block] Disclosure of investments, excluding financial instruments owned. Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Short-term Debt Short-Term Debt [Line Items] Common Stock Common Stock [Member] Contingent consideration Business Combination, Contingent Consideration, Liability Expected stock price volatility Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Litigation Settlement, Fee Expense Litigation Settlement, Fee Expense Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cover [Abstract] Dividend yield Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Weighted average interest rate Short-Term Debt, Weighted Average Interest Rate, at Point in Time Derivative Contract [Domain] Derivative Contract [Domain] Schedule Of Compliance With Regulatory Capital Requirements For Broker Dealer [Table] Schedule Of Compliance With Regulatory Capital Requirements For Broker Dealer [Table] Schedule Of Compliance With Regulatory Capital Requirements For Broker Dealer [Table] Deal-related expenses Deal-related expenses Deal-related expenses include costs we incurred over the course of a completed investment banking deal, which primarily consist of offering expenses, travel and entertainment costs and market data services. Annual grants Annual Grant [Member] Annual Grant [Member] Equity Awards Adjustments Equity Awards Adjustments [Member] Accounting Standards Update [Domain] Accounting Standards Update [Domain] Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Total liabilities and shareholders' equity Liabilities and Equity Share based compensation option exercise price Share based compensation option exercise price The exercise price is the percent above the closing price on date of grant. Payables to brokers, dealers and clearing organizations Increase (Decrease) in Payable to Broker-Dealer and Clearing Organization Marketing and business development Business Development Stock options Share-Based Payment Arrangement, Option [Member] Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases G Squared Capital Partners G Squared Capital Partners [Member] G Squared Capital Partners Fair Value, Balance Sheet Grouping, Financial Statement Captions Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Noncontrolling interests Equity, Attributable to Noncontrolling Interest Financial Instruments and Other Inventory Positions Owned [Domain] Financial Instruments and Other Inventory Positions Owned [Domain] Financial Instruments and Other Inventory Positions Owned [Domain] Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Asset Class [Axis] Asset Class [Axis] Plan Name [Axis] Plan Name [Axis] Related Party, Type [Domain] Related and Nonrelated Parties [Domain] Derivative liability contracts, measurement input Derivative Liability, Measurement Input Tabular List, Table Tabular List [Table Text Block] Vesting [Axis] Vesting [Axis] Restricted stock related to acquisitions Restricted stock related to acquisitions [Member] Restricted stock related to acquisitions Total Common Shareholders' Equity Parent [Member] Name Awards Close in Time to MNPI Disclosures, Individual Name Shareholders’ equity (1): Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Fee receivables Accrued Fees and Other Revenue Receivable 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] Aggregate Intrinsic Value of Stock Options Outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Canceled (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Market approach Valuation, Market Approach [Member] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Grant Year 2024 Grant Year 2024 [Member] Grant Year 2024 Preferred Stock, Shares Authorized Preferred Stock, Shares Authorized Contingent consideration Business Combination, Contingent Consideration, Type [Domain] Adjustment to Compensation: Adjustment to Compensation [Axis] Receivables from brokers, dealers and clearing organizations Increase (Decrease) in Receivable from Broker-Dealer and Clearing Organization Share Repurchase Program [Axis] Share Repurchase Program [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Cash paid during the period for interest Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Cornerstone Macro Cornerstone Macro [Member] Cornerstone Macro Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales Hedging Designation [Axis] Hedging Designation [Axis] Fee receivables Trade Accounts Receivable [Member] Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits Deferred Compensation Arrangement with Individual, Excluding Share-Based Payments and Postretirement Benefits [Line Items] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Total assets Assets, Fair Value Disclosure Vesting Year 2027 Vesting Year 2027 [Member] Vesting Year 2027 Fair Value, Concentration of Risk, Disclosure Items [Domain] Fair Value, Concentration of Risk, Disclosure Items [Domain] Name Measure Name Pay vs Performance Disclosure [Line Items] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Derivative contracts Financial Instruments Sold, Not yet Purchased, Derivatives and Other Contracts Fiscal Year [Domain] Fiscal Year [Domain] Fiscal Year [Domain] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Total investments attributable to Piper Sandler Companies Investments Attributable to Parent Investments Attributable to Parent Additional Paid-in Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Derivative Category [Domain] Derivative Category [Domain] [Domain] for Information by category of derivative contract. Shares reserved/issued for director compensation Deferred Compensation Arrangement with Individual, Fair Value of Shares Issued Dividends [Axis] Dividends [Axis] Revision of Prior Period [Axis] Revision of Prior Period [Axis] U.S. government securities Financial Instruments Sold, Not yet Purchased, US Treasury Securities Fair value of obligations arising from US Treasury Securities sold short. Name Trading Arrangement, Individual Name Grant Type [Domain] Grant Type [Domain] [Domain] for Grant Type [Axis] Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Net of Forfeitures Company Selected Measure Amount Company Selected Measure Amount Not Designated as Hedging Instrument Not Designated as Hedging Instrument [Member] Short-Term Financing Short-Term Debt [Text Block] Unrealized gains/(losses) for assets/(liabilities) held at period end Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) Financial instruments and other inventory positions sold, but not yet purchased Financial Instruments And Other Inventory Positions Sold But Not Yet Purchased [Member] Primary financial statement caption encompassing financial instruments and other inventory positions sold but not yet purchased. Accounts and Financing Receivables [Table] Accounts and Financing Receivables [Table] Net income Net income Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Investments at fair value, measurement input Equity Securities, FV-NI, Measurement Input Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Shares reserved/issued for director compensation (in shares) Deferred Compensation Arrangement with Individual, Shares Issued Income tax expense/(benefit) Income Tax Expense (Benefit) Total non-interest expenses Total non-interest expenses Noninterest Expense New Accounting Pronouncement or Change in Accounting Principle, Description New Accounting Pronouncement or Change in Accounting Principle, Description Adjustments to reconcile net income to net cash used in operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Noncash Item [Abstract] Financial Instruments Owned and Pledged as Collateral Financial Instruments Owned and Pledged as Collateral [Line Items] Award Timing Method Award Timing Method [Text Block] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Net decrease in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Fair Value Inputs Assets and Liabilities Quantitative Information [Table] Fair Value Inputs Assets and Liabilities Quantitative Information [Table] Fair Value Inputs Assets and Liabilities Quantitative Information [Table] Financial Instruments and Other Inventory Positions Owned and Financial Instruments and Other Inventory Positions Sold, but Not Yet Purchased by Type Schedule of Securities Owned and Sold, Not yet Purchased, at Fair Value [Table Text Block] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Maximum amount of contingent consideration Business Combination, Contingent Consideration, Range of Outcomes, Maximum, Amount Minimum regulatory net capital required Debt Instrument, Covenant Compliance, Minimum Net Capital Requirement The minimum amount of net capital which the reporting entity's U.S. broker dealer subsidiary is required to maintain in orer to maintain compliance with the debt instrument. Variable Interest Entity, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Retention MFRS Awards Retention Mutual Fund Restricted Shares [Member] Retention Mutual Fund Restricted Shares Accounting Policies and Pronouncements Accounting Standards Update and Change in Accounting Principle [Text Block] Net income attributable to Piper Sandler Companies Net income attributable to Piper Sandler Companies Net Income (Loss) Attributable to Parent Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Investments Investments [Member] Balance Sheet Location [Axis] Location, Statement of Financial Position, Balance [Axis] Discounted cash flow Valuation Technique, Discounted Cash Flow [Member] Statement [Table] Statement [Table] Vesting Year 2029 Vesting Year 2029 [Member] Vesting Year 2029 Restatement Determination Date: Restatement Determination Date [Axis] Proceeds from stock option exercises Proceeds from Stock Options Exercised Weighted Average Exercise Price of Options Exercisable Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Derivative Assets Derivative Asset, Subject to Master Netting Arrangement, before Offset Schedule of Other Assets Schedule of Other Assets [Table Text Block] Schedule of Investments Investment Holdings, Other than Securities [Table Text Block] Purchases of fixed assets, net Payments for (Proceeds from) Productive Assets Revenues Revenues [Abstract] Number of stock-based compensation plans Number Of Share Based Compensation Plans Number Of Share Based Compensation Plans Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]