Document and Entity Information [Abstract] Document Information [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Common Stock [Member] Common Stock Warrant [Member] Warrants Document Information [Line Items] Document and Entity Information Document Type Document Annual Report Document Period End Date Document Transition Report Entity File Number Entity Registrant Name Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Address, Address Line One 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 Security Exchange Name Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Small Business Entity Emerging Growth Company Entity Ex Transition Period ICFR Auditor Attestation Flag Document Financial Statement Error Correction [Flag] Entity Shell Company Entity Public Float Entity Common Stock, Shares Outstanding Entity Central Index Key Current Fiscal Year End Date Document Fiscal Year Focus Document Fiscal Period Focus Amendment Flag Auditor Name Auditor Location Auditor Firm ID CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION Statement [Table] Description of type or class A of redeemable convertible preferred stock. Convertible redeemable preferred stock possess conversion and redemption features. The stock has redemption features that are outside the control of the issuer. SeriesA Redeemable Convertible Preferred Stock [Member] Series A Redeemable Convertible Preferred Stock Class A Redeemable Convertible Preferred Stock Represents information relating to Series B Preferred stock that may be exchanged into common shares or other types of securities at the owner's option. Series B Convertible Preferred Stock [Member] Class B Convertible Preferred Stock Series B Convertible Preferred Stock Statement [Line Items] Statement Assets [Abstract] Assets: The sum of cash and cash equivalents plus restricted cash. Cash and cash equivalents consist of short term, highly liquid investments that are readily convertible to known amounts of cash and are so near their maturity that they present negligible risk of changes in value due to changes in interest rates -- usually with an original maturity less than 90 days. Cash, Cash Equivalents, and Restricted Cash Cash, cash equivalents and restricted cash No definition available. Receivables, Net [Abstract] Receivables, net: Commissions and Floor Brokerage Receivables Commissions receivable Due from Correspondent Brokers Due from Clearing Broker Other Receivables Other Property, Plant and Equipment, Net Property and equipment, net Property and equipment, net Operating Lease, Right-of-Use Asset Operating lease ROU assets Right of use assets Intangible Assets, Net (Excluding Goodwill) Intangible assets, net Goodwill Goodwill Other Assets Other assets Assets TOTAL ASSETS Liabilities [Abstract] Liabilities: Accounts Payable and Accrued Liabilities Accounts payable, accrued expenses and other liabilities Commission Payable to Broker-Dealer and Clearing Organization Commissions payable Operating Lease, Liability Operating lease liability Operating lease liabilities Notes Payable Notes payable, net of unamortized debt issuance costs of $739 and $645 as of December 31, 2024 and 2023, respectively Outstanding amount Subordinated Debt Promissory notes-affiliates Represents the principal and accrued interest of promissory notes. Promissory Notes, Principal and Accrued Interest Due to members Liabilities TOTAL LIABILITIES Mezzanine Equity: Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests Preferred stock, ending balance Preferred stock, beginning balance Redeemable Series A Convertible Preferred Stock, par value $0.0001, 2,000,000 shares authorized, 1,555,000 shares outstanding at December 31, 2024 Stockholders' Equity and Members' Equity Stockholders' Equity and Members' Equity: Preferred Stock, Value, Issued Series B Convertible Preferred Stock, par value $0.0001, 500,000 shares authorized, 150,000 shares outstanding at December 31, 2024 Common Stock, Value, Issued Common stock, $0.0001 par value, 55,000,000 authorized, 16,602,460 issued and outstanding at December 31, 2024 Additional Paid in Capital Additional paid-in-capital Retained Earnings (Accumulated Deficit) Accumulated deficit Members' Equity Attributable to Noncontrolling Interest Members' Equity attributed to Legacy BMS Management Services LLC Equity, Including Portion Attributable to Noncontrolling Interest Ending balance Beginning balance Total Stockholders' Equity, Mezzanine Equity and Members' Equity Attributable to BMS Management Services LLC Liabilities and Equity TOTAL LIABILITIES, MEZZANINE EQUITY AND STOCKHOLDERS' EQUITY Unamortized Debt Issuance Expense Unamortized debt issuance costs Temporary Equity, Par or Stated Value Per Share Redeemable convertible preferred stock par value Temporary Equity, Shares Authorized Redeemable convertible preferred stock shares authorized Temporary Equity, Shares Outstanding Preferred stock ending balance (in shares) Preferred stock, beginning balance (in shares) Redeemable convertible preferred stock shares outstanding Preferred Stock, Par or Stated Value Per Share Preferred stock par value Preferred Stock, Shares Authorized Shares of Preferred Stock authorized Preferred Stock shares authorized Preferred Stock, Shares Outstanding Preferred stock, shares outstanding Preferred Stock shares outstanding Common Stock, Par or Stated Value Per Share Common stock par value Common Stock, Shares Authorized Common stock shares authorized Common Stock, Shares, Issued Common stock shares issued Common Stock, Shares, Outstanding Common stock shares outstanding CONSOLIDATED STATEMENTS OF OPERATIONS Revenues [Abstract] Revenues: REVENUES FROM CONTRACTS WITH CUSTOMERS Revenue from Contracts with Customers: Brokerage Commissions Revenue Commissions Fee Income Advisory fees Revenue from Contract with Customer, Excluding Assessed Tax Revenues From Contracts with Customers Total Revenue from Contracts with Customers Interest and Other Income Interest and other income Revenues Total revenues Operating Expenses [Abstract] Expenses: Sales Commissions and Fees Commissions and fees Employee Benefits and Share-Based Compensation Employee compensation and benefits Amount of rent and net occupancy expense that may include items, such as depreciation of facilities and equipment, lease expenses, property taxes and property and casualty insurance expense. Rent and Occupancy Rent and occupancy Professional Fees Professional fees Information Technology and Data Processing Technology fees Interest Expense, Operating Interest Depreciation, Depletion and Amortization, Nonproduction Depreciation and amortization Other Expenses Other Operating Expenses Total expenses Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest (Loss) income before provision for income taxes Income Tax Expense (Benefit) Provision (benefit) for income taxes Income tax provision (benefit) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net (loss) income Net income (loss) Net Income (Loss) Attributable to Noncontrolling Interest Net income attributable to Legacy BMS Management Services LLC members Net income prior to transaction Net (loss) income Net loss attributable to Binah Capital Group, Inc. post transaction Earnings Per Share, Basic Net loss per share basic (in dollars per share) Earnings Per Share, Diluted Net loss per share diluted (in dollars per share) Weighted Average Number of Shares Outstanding, Basic Weighted average shares: basic (in shares) Weighted-average shares for basic Weighted Average Number of Shares Outstanding, Diluted Weighted average shares: diluted (in shares) Weighted-average shares for diluted CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY Equity Components [Axis] Equity Component [Domain] Noncontrolling Interest [Member] Members' Equity Attributed to Legacy BMS Management Services LLC Preferred Stock [Member] Redeemable Convertible Preferred Stock Member Units [Member] Common Stock Additional Paid-in Capital [Member] Additional Paid-in Capital Retained Earnings [Member] Accumulated Deficit Shares, Outstanding Ending balance (in shares) Beginning balance (in shares) Stock Redeemed or Called During Period, Value Redemption of Class B Preferred Units Distributed Earnings Distributions Value of stock issued pursuant to reverse merger and recapitalization during the period. Stock Issued During Period, Value, Reverse Merger And Recapitalization Reverse merger and recapitalization of legacy BMS Management Services LLC Number of shares issued pursuant to reverse merger and recapitalization during the period. Stock Issued During Period, Shares, Reverse Merger And Recapitalization Reverse merger and recapitalization of legacy BMS Management Services LLC (in shares) Value of new stock issued in PIPE financing classified as temporary equity issued during the period. Temporary Equity, Stock Issued During Period, Value, New Issues in PIPE Financing Mezzanine Equity - Shares Issued in connection with PIPE financing Number of shares of new stock issued in PIPE financing classified as temporary equity issued during the period. Temporary Equity, Stock Issued During Period, Shares, New Issues in PIPE Financing Mezzanine Equity - Shares Issued in connection with PIPE financing (in shares) Temporary Equity, Stock Issued During Period, Value, New Issues Issuance of Class A redeemable convertible preferred stock Number of shares of new stock classified as temporary equity issued during the period. Temporary Equity, Stock Issued During Period, Shares, New Issues Issuance of Class A redeemable convertible preferred stock (in shares) Stock Issued During Period, Value, Conversion of Convertible Securities Issuance of Class B convertible preferred stock Stock Issued During Period, Shares, Conversion of Convertible Securities Issuance of Class B convertible preferred stock (in shares) Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings Dividends - Preferred stock Amount of stock issued during the period as a result of exercise of warrants. Stock Issued During period, Value, Warrant Exercised Issuance of common stock in connection with exercise of warrants Number of common stock issued during the period in connection with the exercise of warrants. Stock Issued During period, Shares, Warrant Exercised Issuance of common stock in connection with exercise of warrants (in shares) CONSOLIDATED STATEMENTS OF CASH FLOWS Related Party, Type [Axis] Related Party, Type [Domain] Affiliated Entity [Member] Affiliates Members of legal form of business company offering limited liability to its owners. Members of Limited Liability Company [Member] Members 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 (loss) to net cash (used in) provided by operating activities: Amount of expense charged against earnings to allocate the cost of tangible and intangible assets over their remaining economic lives. Depreciation and amortization Deferred Income Tax Expense (Benefit) Deferred income taxes Amortization of Debt Issuance Costs Amortization of debt issuance costs Amount of expense or loss included in net income that result in no cash flow. Noncash Lease Expense Non-cash lease expense Interest Costs Capitalized Capitalized interest Gain (Loss) on Disposition of Assets Loss on disposal of property and leasehold improvements Amount of adjustment of change in allowance of credit losses. Adjustments For Changes In Allowance For Credit Losses Change in allowance for credit losses Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities: Increase (Decrease) in Receivable from Broker-Dealer and Clearing Organization Due from clearing broker The increase (decrease) during the reporting period in the amount due from lessees arising from commissions receivables. Increase (Decrease) in Commissions Receivables Commissions receivable Increase (Decrease) in Other Receivables Other receivables Increase (Decrease) in Other Operating Assets Other assets Increase (Decrease) in Accounts Payable and Accrued Liabilities Accounts payable, accrued expenses and other liabilities The increase (decrease) during the reporting period in the amount due from lessees arising from commissions payables. Increase (Decrease) in Commissions Payable Commissions payable Increase (Decrease) in Operating Lease Liability Operating lease liability Net Cash Provided by (Used in) Operating Activities Net Cash (Used in) Provided By Operating Activities Net Cash Provided by (Used in) Investing Activities [Abstract] Cash Flows From Investing Activities Payments to Acquire Property, Plant, and Equipment Purchases of property and equipment Net Cash Provided by (Used in) Investing Activities Net Cash Used In Investing Activities Net Cash Provided by (Used in) Financing Activities [Abstract] Cash Flows From Financing Activities Proceeds from Notes Payable Borrowings under note payable Payments of Debt Issuance Costs Payment of debt issuance costs Repayments of Notes Payable Repayment - notes payable Repayments of notes Repayments of Related Party Debt Repayment of promissory notes-affiliates Repayments of Debt Repayment of borrowings from members The cash outflow for financing costs associated with reverse merger and recapitalization. Payments For Reverse Merger And Recapitalization Net payment for reverse merger and recapitalization Proceeds from Issuance of Redeemable Convertible Preferred Stock Proceeds from Series A Redeemable Convertible Preferred Stock Proceeds from Issuance of Convertible Preferred Stock Proceeds from Series B Convertible Preferred Stock Amount of cash outflow in the form of ordinary dividends to redeemable convertible preferred shareholders of the parent entity. Payments Of Ordinary Dividends, Redeemable Convertible Preferred Stock Dividends - Series A Redeemable Convertible Preferred Stock Proceeds from Warrant Exercises Proceeds from exercise of warrants The cash outflow for redemption of preferred units. Payments For Redemption of Preferred Units Redemption of Class B Preferred Units Payments of Capital Distribution Distribution of capital 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), Including Exchange Rate Effect Net Change in Cash, Cash Equivalents and Restricted Cash Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Cash, Cash Equivalents and Restricted Cash - End of Period Cash, Cash Equivalents and Restricted Cash - Beginning of Period Supplemental Cash Flow Information [Abstract] Supplemental Disclosure of Cash Flow Information Right-of-Use Asset Obtained in Exchange for Operating Lease Liability ROU assets obtained in exchange for lease liabilities - Operating leases Right of use asset in exchange for operating lease liability No definition available. Cash Paid During The Year [Abstract] Cash Paid During the Period for: Interest Paid, Including Capitalized Interest, Operating and Investing Activities Interest Income Taxes Paid, Net Income taxes Amount of outstanding value of note payable being a promissory notes-affilaites. Notes Payable, Promissory Notes-Affilaites Promissory notes-affilaites Amount of obligation outstanding at the time of reverse merger and recapitalization. Amount Of Obligation, Reverse Merger And Recapitalization, Non Cash Financing Transaction Issued stock obligations Amount of dividend accrued related to the Class B Convertible Preferred Stock. Dividend Payable, Convertible Preferred Stock Dividend accrued related to the Class B Convertible Preferred Stock Dividends, Preferred Stock, Paid-in-kind Dividend paid in kind ORGANIZATION AND NATURE OF BUSINESS Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] ORGANIZATION AND NATURE OF BUSINESS BUSINESS COMBINATION Business Combination Disclosure [Text Block] BUSINESS COMBINATION SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES No definition available. MERGER AND RECAPITALIZATION