v3.26.1
Fees and Expenses
May 01, 2026
USD ($)
RMB Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] FEES AND EXPENSES OF THE FUND
Expense Narrative [Text Block] The table below describes the fees and expenses you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund. More information about these and other discounts is available from your financial intermediary and in the “Choosing a Share Class” section on page 46 of this prospectus, Appendix A to this prospectus, and the “Purchase and Redemption of Shares” section on page 30 of the Fund’s Statement of Additional Information.
Expense Breakpoint Discounts [Text] You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund.
Expense Breakpoint, Minimum Investment Required [Amount] $ 50,000
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] Total Annual Fund Operating Expenses do not correlate to the Ratio of Total Expenses to Average Net Assets in the Financial Highlights section of the statutory prospectus, which reflects the operating expenses of the Fund and does not include acquired fund fees and expenses (“AFFE”).
Shareholder Fees Caption [Optional Text] Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses(expenses that you pay each year as a percentage of the value of your investment)
Expense Example [Heading] Example
Expense Example Narrative [Text Block] These Examples are intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The first Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods, followed by an Example that assumes you do not redeem your Class C shares at the end of the periods. The Examples also assume that your investment has a 5% return each year and that the Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] You would pay the following expenses if you did not redeem your shares:
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block] The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 43% of the average value of its portfolio.
Portfolio Turnover, Rate 43.00%
RMB Mendon Financial Services Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] FEES AND EXPENSES OF THE FUND
Expense Narrative [Text Block] The table below describes the fees and expenses you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund. More information about these and other discounts is available from your financial intermediary and in the “Choosing a Share Class” section on page 46 of this prospectus, Appendix A to this prospectus, and the “Purchase and Redemption of Shares” section on page 30 of the Fund’s Statement of Additional Information.
Expense Breakpoint Discounts [Text] You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund.
Expense Breakpoint, Minimum Investment Required [Amount] $ 50,000
Shareholder Fees Caption [Optional Text] Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses(expenses that you pay each year as a percentage of the value of your investment)
Expense Example [Heading] Example
Expense Example Narrative [Text Block] These Examples are intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The first Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods, followed by an Example that assumes you do not redeem your Class C shares at the end of the periods. The Examples also assume that your investment has a 5% return each year and that the Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] You would pay the following expenses if you did not redeem your shares:
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block] The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 50% of the average value of its portfolio.
Portfolio Turnover, Rate 50.00%
RMB International Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] FEES AND EXPENSES OF THE FUND
Expense Narrative [Text Block] The table below describes the fees and expenses you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the Fee Table or the Example below.
Shareholder Fees Caption [Optional Text] Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses(expenses that you pay each year as a percentage of the value of your investment)
Expense Example [Heading] Example
Expense Example Narrative [Text Block] The Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block] The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 31% of the average value of its portfolio.
Portfolio Turnover, Rate 31.00%
RMB International Fund | RMB International Fund, Investor Class  
Prospectus [Line Items]  
Other Expenses, New Fund, Based on Estimates [Text] Investor Class shares of the Fund are not currently offered for purchase. As a result, “Other Expenses” for Investor Class shares have been estimated.
RMB International Fund | RMB International Fund, Class I  
Prospectus [Line Items]  
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] Total Annual Fund Operating Expenses for Class I shares do not correlate to the Ratio of Total Expenses to Average Net Assets in the Financial Highlights section of the statutory prospectus, which reflects the operating expenses of the Fund and does not include acquired fund fees and expenses (“AFFE”).
RMB SMID Cap Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] FEES AND EXPENSES OF THE FUND
Expense Narrative [Text Block]
The table below describes the fees and expenses you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the Fee Table or the Example below.
Shareholder Fees Caption [Optional Text] Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses(expenses that you pay each year as a percentage of the value of your investment)
Expense Example [Heading] Example
Expense Example Narrative [Text Block] The Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same, taking into account the Expense Cap in the first year only.
Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example,
affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 12% of the average value of its portfolio.
Portfolio Turnover, Rate 12.00%
RMB SMID Cap Fund | RMB SMID Cap Fund Investor Class  
Prospectus [Line Items]  
Other Expenses, New Fund, Based on Estimates [Text] Investor Class shares of the Fund are not currently offered for purchase. As a result, “Other Expenses” for Investor Class shares have been estimated.
RMB Quality Intermediate Core Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] FEES AND EXPENSES OF THE FUND
Expense Narrative [Text Block] The table below describes the fees and expenses you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
Shareholder Fees Caption [Optional Text] Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses(expenses that you pay each year as a percentage of the value of your investment)
Expense Example [Heading] Example
Expense Example Narrative [Text Block] These Examples are intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The first Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods, taking into account the Expense Cap in the first year only. The Examples also assume that your investment has a 5% return each year and that the Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example,
affect the Fund’s performance. For the period September 22, 2025 (commencement of operations) through December 31, 2025, the Fund’s portfolio turnover rate was 0% of the average value of its portfolio.
Portfolio Turnover, Rate none
RMB Quality Intermediate Core Fund | RMB Quality Intermediate Core Fund, Investor Class  
Prospectus [Line Items]  
Other Expenses, New Fund, Based on Estimates [Text] Investor Class shares of the Fund are not currently offered for purchase. As a result, “Other Expenses” for Investor Class shares have been estimated.
RMB Quality Intermediate Core Fund | RMB Quality Intermediate Core Fund, Class I  
Prospectus [Line Items]  
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] Total Annual Fund Operating Expenses for Class I shares do not correlate to the Ratio of Total Expenses to Average Net Assets in the Financial Highlights section of the statutory prospectus, which reflects the operating expenses of the Fund and does not include acquired fund fees and expenses (“AFFE”).
RMB Quality Intermediate Tax-Exempt Municipal Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] FEES AND EXPENSES OF THE FUND
Expense Narrative [Text Block] The table below describes the fees and expenses you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] Total Annual Fund Operating Expenses do not correlate to the Ratio of Expenses to Average Net Assets in the Financial Highlights section of the statutory prospectus, which reflects the operating expenses of the Fund and does not include acquired fund fees and expenses (“AFFE”).
Shareholder Fees Caption [Optional Text] Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses(expenses that you pay each year as a percentage of the value of your investment)
Expense Example [Heading] Example
Expense Example Narrative [Text Block] These Examples are intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The first Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Examples also assume that your investment has a 5% return each year and that the Fund’s operating expenses remain the same, taking into account the Expense Cap in the first year only.
Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are
held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Fund’s performance. For the period September 22, 2025 (commencement of operations) through December 31, 2025, the Fund’s portfolio turnover rate was 1% of the average value of its portfolio.
Portfolio Turnover, Rate 1.00%
RMB Quality Intermediate Tax-Exempt Municipal Fund | RMB Quality Intermediate Tax-Exempt Municipal Fund, Investor Class  
Prospectus [Line Items]  
Other Expenses, New Fund, Based on Estimates [Text] Investor Class shares of the Fund are not currently offered for purchase. As a result, “Other Expenses” for Investor Class shares have been estimated.