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Label Element Value
Prospectus [Line Items] rr_ProspectusLineItems  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Dec. 31, 2018
Entity Registrant Name dei_EntityRegistrantName RMB INVESTORS TRUST
Entity Central Index Key dei_EntityCentralIndexKey 0000030126
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate May 01, 2019
Document Effective Date dei_DocumentEffectiveDate May 01, 2019
Prospectus Date rr_ProspectusDate May 01, 2019
Entity Inv Company Type dei_EntityInvCompanyType N-1A
RMB Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading RMB Fund
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The RMB Fund (the “Fund”) seeks capital appreciation, mainly long term. Income is generally of lesser importance, meaning that it is a secondary goal.
There can be no assurance that the Fund will be successful in achieving its investment objective.
Expense [Heading] rr_ExpenseHeading FEES AND EXPENSES OF THE FUND
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
The table below describes the fees and expenses you may pay if you buy and hold shares of the Fund. 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 professional and in the “Choosing a Share Class” section on page 52 of this prospectus and the “Purchase and Redemption of Shares” section of the Fund’s Statement of Additional Information.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading PORTFOLIO TURNOVER
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
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 23% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 23.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts 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 professional and in the “Choosing a Share Class” section on page 52 of this prospectus and the “Purchase and Redemption of Shares” section of the Fund’s Statement of Additional Information.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
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 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. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption Narrative [Text Block] rr_ExpenseExampleNoRedemptionNarrativeTextBlock
You would pay the following expenses if you did not redeem your shares:
Strategy [Heading] rr_StrategyHeading PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund pursues its investment objective by investing in a diverse portfolio primarily consisting of common stocks.
The Fund generally invests in high quality companies of all market capitalizations with a focus on businesses that have sustainable, long term competitive advantages. Portfolio companies may range from small and mid-sized businesses that are earlier in their growth life cycle, to larger more mature companies that return capital to shareholders through increasing dividend payments and share buy-backs. High quality companies are generally defined as companies with product leadership, that have potential for sustained operating and revenue growth and that are run by strong management teams that allocate shareholder capital wisely and align their economic interests with shareholders. The Fund employs a long-term approach when selecting stocks and seeks to own businesses that have durable franchises that can weather the ups and downs of volatile business cycles.
From time to time, the Fund may invest in companies that are experiencing unusual and possibly unique developments. Potential investments in the stock of these companies are usually the result of companies uncovered in the research process that do not meet the criteria employed by the Fund but may have opportunities for significant returns. These companies are deemed “special situations.” Special situations include companies going through reorganizations, recapitalizations, mergers, spin-offs, or facing resolutions of litigation, management team changes, or important technological improvements or discoveries.
The Fund’s investment strategy seeks to build wealth over time by purchasing the stock of companies in growing industries that are deemed to be trading below their intrinsic value. The Fund’s portfolio is constructed on a stock by stock basis. Position sizes are determined based on current portfolio characteristics, valuation, the risk/reward profile and confidence in the company. The Fund may consider larger macro-economic trends, and will occasionally pursue investment themes across multiple holdings, when constructing the portfolio. The Fund seeks to manage risk by diversifying its holdings across sectors and industries, generally avoiding illiquid securities. The Fund typically owns 30-40 stocks which is intended to allow for enough diversification to minimize risk, but enough concentration to allow the highest conviction ideas to impact the portfolio. A position will be sold if a core tenet for ownership has been violated, if valuation discounts substantially all of the upside of a company, or if a better use of capital presents itself.
Risk [Heading] rr_RiskHeading PRINCIPAL RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
As with any mutual fund, there is no guarantee that the Fund will achieve its objective. The Fund’s share price fluctuates, which means you could lose money by investing in the Fund. The Fund is not a complete investment program and should be considered only as part of an investment portfolio. The principal risks of investing in the Fund are summarized below:
Any of the following situations could cause the Fund to lose money or underperform in comparison with its peer group:
•
Market Risk — This is the risk that the price of a security will fall due to changing economic, political or market conditions, or due to a company’s individual situation. The risk would be greater if any of the categories of securities that the Fund emphasizes — large-capitalization stocks or particular sectors or groups of industries — fell out of favor with the market. Companies in the Fund’s portfolio could fail to achieve earnings estimates or other market expectations, causing their stock prices to drop.
•
Equity Securities Risk — The risk that the market price of common stocks and other equity securities, including preferred stocks, warrants and rights, may go up or down, sometimes rapidly or unpredictably, including due to factors affecting equity securities markets generally, particular industries represented in those markets, or the issuer itself.
•
Management Risk — The Fund is subject to management risk because it is an actively managed investment portfolio. The adviser will apply its investment techniques and risk analyses in making investment decisions for the Fund, but there is no guarantee that its decisions will produce the intended result. The Fund’s management strategy or security selection methods could prove less successful than anticipated or unsuccessful. This risk is common for all actively managed funds.
•
Large-Cap Company Risk — Larger, more established companies may be unable to respond quickly to new competitive challenges, such as changes in consumer tastes or innovative smaller competitors. Also, large-cap companies are sometimes unable to attain the high growth rates of successful, smaller companies, especially during extended periods of economic expansion.
•
Dividend Risk — This is the risk that an issuer of stock held by the Fund may choose not to declare a dividend or the dividend rate might not remain at current levels. Dividend paying stocks might not experience the same level of earnings growth or capital appreciation as non-dividend paying stocks. The Fund’s performance during a broad market advance could suffer because dividend paying stocks may not experience the same capital appreciation as non-dividend paying stocks.
•
Small-and Mid-Capitalization Companies Risk — The Fund may invest in the securities of companies with small and mid-capitalizations, which can involve greater risk and the possibility of greater portfolio volatility than investments in securities of large capitalization companies. Historically, stocks of small and mid-capitalization companies and recently organized companies have been more volatile in price than those of the larger market capitalization companies. Among the reasons for the greater price volatility is the lower degree of liquidity in the markets for such stocks. Small and mid-capitalization companies may have limited product lines and financial resources and may depend upon a limited or less experienced management group. The securities of small capitalization companies trade in the over-the-counter markets or on regional exchanges and may not be traded daily or in the volume typical of trading on a national securities exchange, which may make these securities more difficult to value and to sell.
•
Growth Investing Risk — Growth stocks may fall out of favor with investors and underperform other asset types during given periods. A company may never achieve the earnings growth the team anticipated.
•
Special Situations Risk — The Fund will seek to benefit from “special situations,” such as mergers, reorganizations, or other unusual events expected to affect a particular issuer. There is a risk that the “special situation” might not occur or involve longer time frames than originally expected, which could have a negative impact on the price of the issuer’s securities and fail to produce gains or produce a loss for the Fund.
Risk Lose Money [Text] rr_RiskLoseMoney Any of the following situations could cause the Fund to lose money or underperform in comparison with its peer group:
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading PAST PERFORMANCE
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual total returns for 1, 5 and 10 years compare with those of a broad measure of market performance. Bear in mind that past performance (before and after taxes) is not a guarantee of future performance. Returns shown for periods prior to July 1, 2016 were generated under the management of the Fund’s former investment adviser.
The bar chart shows the annual total returns of the Fund’s Class A shares for each of the last ten calendar years. The returns in the bar chart do not include the effect of Class A shares’ front-end sales charges. These figures would be lower if they reflected such sales charges. The table presents the Fund’s average annual total returns over 1-, 5- and 10-year periods compared to the S&P 500® Index Total Return, which represents a broad measure of market performance and the reinvestment of dividends in the index, S&P 500® Index (price return), which represents a broad measure of market performance without the reinvestment of dividends in the index, the Morningstar Large Growth Category average, which represents the performance of the Fund’s peer group and the Russell 3000 Total Return Index, which represents a broad measure of market performance across all market capitalizations. The funds included in the Morningstar Large Growth Category are determined by Morningstar, Inc. The Fund’s performance figures assume that all distributions were reinvested in the Fund and do not reflect the deduction of the Fund’s maximum sales charges or its annual operating expenses. Updated performance information may be obtained on the Fund’s website at www.rmbfunds.com or by calling 1-800-462-2392.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual total returns for 1, 5 and 10 years compare with those of a broad measure of market performance. Bear in mind that past performance (before and after taxes) is not a guarantee of future performance. Returns shown for periods prior to July 1, 2016 were generated under the management of the Fund’s former investment adviser.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-462-2392.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.rmbfunds.com or by calling 1-800-462-2392.
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Bear in mind that past performance (before and after taxes) is not a guarantee of future performance. Returns shown for periods prior to July 1, 2016 were generated under the management of the Fund’s former investment adviser.
Bar Chart [Heading] rr_BarChartHeading RMB Fund – Return for Class A Shares
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The returns in the bar chart do not include the effect of Class A shares’ front-end sales charges. These figures would be lower if they reflected such sales charges. The table presents the Fund’s average annual total returns over 1-, 5- and 10-year periods compared to the S&P 500® Index Total Return, which represents a broad measure of market performance and the reinvestment of dividends in the index, S&P 500® Index (price return), which represents a broad measure of market performance without the reinvestment of dividends in the index, the Morningstar Large Growth Category average, which represents the performance of the Fund’s peer group and the Russell 3000 Total Return Index, which represents a broad measure of market performance across all market capitalizations. The funds included in the Morningstar Large Growth Category are determined by Morningstar, Inc. The Fund’s performance figures assume that all distributions were reinvested in the Fund and do not reflect the deduction of the Fund’s maximum sales charges or its annual operating expenses. Updated performance information may be obtained on the Fund’s website at www.rmbfunds.com or by calling 1-800-462-2392.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best Quarter: 14.79% in 1st Quarter of 2012
Worst Quarter: (13.32)% in 4th Quarter of 2018
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (For the following periods ended 12/31/2018)
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads The Fund’s performance figures assume that all distributions were reinvested in the Fund and do not reflect the deduction of the Fund’s maximum sales charges or its annual operating expenses. Updated performance information may be obtained on the Fund’s website at www.rmbfunds.com or by calling 1-800-462-2392.
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction of fees, expenses or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”). The after-tax returns are shown only for Class A shares; after-tax returns for Class C and Class I shares will vary. The “Total Return After Taxes on Distributions and Sale of Fund Shares” can be higher than other return figures when a capital loss occurs upon the redemption of Fund shares. If realized losses occur upon the sale of Fund shares, the capital loss is recorded as a tax benefit, which increases the return.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”). The after-tax returns are shown only for Class A shares; after-tax returns for Class C and Class I shares will vary. The “Total Return After Taxes on Distributions and Sale of Fund Shares” can be higher than other return figures when a capital loss occurs upon the redemption of Fund shares. If realized losses occur upon the sale of Fund shares, the capital loss is recorded as a tax benefit, which increases the return.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown The after-tax returns are shown only for Class A shares; after-tax returns for Class C and Class I shares will vary. The “Total Return After Taxes on Distributions and Sale of Fund Shares” can be higher than other return figures when a capital loss occurs upon the redemption of Fund shares. If realized losses occur upon the sale of Fund shares, the capital loss is recorded as a tax benefit, which increases the return.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”). The after-tax returns are shown only for Class A shares; after-tax returns for Class C and Class I shares will vary. The “Total Return After Taxes on Distributions and Sale of Fund Shares” can be higher than other return figures when a capital loss occurs upon the redemption of Fund shares. If realized losses occur upon the sale of Fund shares, the capital loss is recorded as a tax benefit, which increases the return.
RMB Fund | S&P 500® Index Total Return (reflects no deduction of fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel S&P 500® Index Total Return (reflects no deduction of fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 (4.38%)
5 Years rr_AverageAnnualReturnYear05 8.49%
10 Years rr_AverageAnnualReturnYear10 13.12%
RMB Fund | S&P 500® Index (price return)(reflects no deduction of fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel S&P 500® Index (price return) (reflects no deduction of fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 (6.24%)
5 Years rr_AverageAnnualReturnYear05 6.28%
10 Years rr_AverageAnnualReturnYear10 10.75%
RMB Fund | Morningstar Large Growth Category (reflects no deduction of fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Morningstar Large Growth Category (reflects no deduction of fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 (1.98%)
5 Years rr_AverageAnnualReturnYear05 8.22%
10 Years rr_AverageAnnualReturnYear10 13.80%
RMB Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.60%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.40%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.25%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 621
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 877
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,152
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,936
Annual Return 2009 rr_AnnualReturn2009 31.11%
Annual Return 2010 rr_AnnualReturn2010 22.45%
Annual Return 2011 rr_AnnualReturn2011 5.40%
Annual Return 2012 rr_AnnualReturn2012 12.57%
Annual Return 2013 rr_AnnualReturn2013 24.28%
Annual Return 2014 rr_AnnualReturn2014 8.04%
Annual Return 2015 rr_AnnualReturn2015 1.52%
Annual Return 2016 rr_AnnualReturn2016 1.32%
Annual Return 2017 rr_AnnualReturn2017 22.49%
Annual Return 2018 rr_AnnualReturn2018 (2.84%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2012
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 14.79%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2018
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (13.32%)
Label rr_AverageAnnualReturnLabel Total Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (7.70%)
5 Years rr_AverageAnnualReturnYear05 4.67%
10 Years rr_AverageAnnualReturnYear10 11.52%
RMB Fund | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Total Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 (9.61%)
5 Years rr_AverageAnnualReturnYear05 0.91%
10 Years rr_AverageAnnualReturnYear10 9.19%
RMB Fund | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Total Return After Taxes on Distributions and Sale of Fund Shares1
1 Year rr_AverageAnnualReturnYear01 (3.07%) [1]
5 Years rr_AverageAnnualReturnYear05 3.45% [1]
10 Years rr_AverageAnnualReturnYear10 9.46% [1]
RMB Fund | Class C  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.60%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.40%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 2.00%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 303
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 627
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,078
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,327
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 203
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 627
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,078
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,327
Label rr_AverageAnnualReturnLabel Total Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (4.38%)
5 Years rr_AverageAnnualReturnYear05 4.97%
10 Years rr_AverageAnnualReturnYear10 11.27%
RMB Fund | Class I  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.60%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.42%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.02%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 104
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 325
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 563
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,248
Label rr_AverageAnnualReturnLabel Total Return Before Taxes [2]
1 Year rr_AverageAnnualReturnYear01 (2.62%) [2]
5 Years rr_AverageAnnualReturnYear05 5.85% [2]
10 Years rr_AverageAnnualReturnYear10 12.15% [2]
RMB Mendon Financial Services Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading RMB Mendon Financial Services Fund
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The RMB Mendon Financial Services Fund (the “Fund”) seeks capital appreciation.
There can be no assurance that the Fund will be successful in achieving its investment objective.
Expense [Heading] rr_ExpenseHeading FEES AND EXPENSES OF THE FUND
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
The table below describes the fees and expenses you may pay if you buy and hold shares of the Fund. 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 professional and in the “Choosing a Share Class” section on page 52 of this prospectus and the “Purchase and Redemption of Shares” section of the Fund’s Statement of Additional Information.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading PORTFOLIO TURNOVER
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
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 58% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 58.00%
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
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 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. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption Narrative [Text Block] rr_ExpenseExampleNoRedemptionNarrativeTextBlock
You would pay the following expenses if you did not redeem your shares:
Strategy [Heading] rr_StrategyHeading PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund pursues its investment objective by investing, under normal circumstances, at least 80% of its net assets (plus any borrowings for investment purposes) in stocks of U.S. companies that are in the financial services sector. The Fund includes the market value of derivatives that provide exposure to the financial services sector in determining compliance with the Fund’s 80% investment policy. The Fund may invest in companies of any size, but, under normal conditions, the Fund invests primarily in mid, small and micro capitalization financial services companies. For purposes of selecting investments, the Fund defines the financial services sector broadly. It includes (but is not limited to) the following:
•
Banks
•
Insurance companies
•
Consumer and commercial finance companies
•
Securities brokerage firms and electronic trading networks
•
Investment management and advisory firms
•
Financial conglomerates
•
Financial technology companies
•
Real Estate Investment Trusts
Ordinarily, the Fund’s portfolio will be invested primarily in common stocks. In selecting stocks, the Fund’s sub-adviser uses a combination of growth and value criteria. Growth criteria include such items as capable management, attractive business niches, sound financial and accounting practices and/or demonstrated ability to sustain growth in revenues, earnings and cash flow. Value criteria include companies that appear to be undervalued based on their balance sheets or individual circumstances, temporarily distressed, or poised for a merger or acquisition.
The Fund may also invest in companies that may experience unusual and possibly unique developments, or “special situations,” which may create a special opportunity for significant returns. Special situations include: significant technological improvements or discoveries; reorganizations, recapitalizations or mergers; favorable resolutions of litigation; new management or material changes in company policies; and actual or potential changes in control of a company. These companies are deemed “special situations.” Special situations include companies going through reorganizations, recapitalizations, mergers, spin-offs or facing resolutions of litigation, management team changes or important technological improves or discoveries.
The portfolio manager constructs the Fund’s portfolio using both a top-down and bottom-up analysis. Examples of top-down analysis include the study of interest rates, credit trends and other macroeconomic factors that broadly affect the financial services sector. Examples of bottom-up analysis include industry screens, sell-side company research reports, company models and other fundamental research that are used to construct the Fund’s portfolio on a stock-by-stock basis. The sub-adviser attempts to identify how various financial services sub-sectors and the individual companies therein will move in reaction to market events. Each potential investment is evaluated by weighing its potential for gain against its associated risks. Because of the way the sub-adviser constructs the Fund’s portfolio, there may be times when the Fund’s investments are focused in one or more financial services sub-sectors and/or a limited number of regions of the U.S.
The Fund may sell securities for a variety of reasons, such as to secure gains, limit losses or redeploy assets into other opportunities.
The Fund may also use futures and options on securities, indices and other derivatives (a type of instrument whose value is determined by reference to the value or the change in value of one or more securities, indices or other financial instruments) to hedge against market changes or as a substitute for securities transactions. It may also use derivatives in attempts to profit from anticipated market and security movements. The Fund expects that its primary investments in derivatives will be in written covered call options and long call options. As the writer of a covered call option, the Fund forgoes, during the option’s life, the opportunity to profit from increases in the market value of the security covering the call option above the sum of the premium and the strike price of the call, but has retained the risk of loss should the price of the underlying security decline. Long call option purchases allow the option holder to be exposed to the general market characteristics of a security without the outlay of capital necessary to own the security.
The Fund’s use of derivatives will have the economic effect of financial leverage. Financial leverage magnifies exposure to the swings in prices of an asset underlying a derivative instrument and results in increased volatility, which means the Fund will have the potential for greater gains, as well as the potential for greater losses, than if the Fund does not use derivatives instruments that have a leveraging effect. Leveraging tends to magnify, sometimes significantly, the effect of any increase or decrease in the Fund’s exposure to an asset and may cause the Fund’s net asset value per share to be volatile.
Risk [Heading] rr_RiskHeading PRINCIPAL RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
As with any mutual fund, there is no guarantee that the Fund will achieve its objective. The Fund’s share price fluctuates, which means you could lose money by investing in the Fund. The Fund is not a complete investment program and should be considered only as part of an investment portfolio. The principal risks of investing in the Fund are summarized below:
•
Market Risk — This is the risk that the price of a security will fall due to changing economic, political or market conditions, or due to a company’s individual situation. The risk would be greater if any of the categories of securities that the Fund emphasizes — mid and small-capitalization stocks or particular sectors or sub-sectors — fell out of favor with the market. Companies in the Fund’s portfolio could fail to achieve earnings estimates or other market expectations, causing their stock prices to drop.
•
Equity Securities Risk — The risk that the market price of common stocks and other equity securities, including preferred stocks, warrants and rights, may go up or down, sometimes rapidly or unpredictably, including due to factors affecting equity securities markets generally, particular industries represented in those markets, or the issuer itself.
•
Financial Services Sector Risk — A fund that focuses its investments in specific industries or sectors is more susceptible to developments affecting those industries and sectors than a more broadly diversified fund would be. Because the Fund invests significantly in the financial services sector, the Fund may perform poorly during a downturn in the financial services industry. The financial services sector can be significantly affected by changes in interest rates, the rate of corporate and consumer debt defaults, the availability and cost of borrowing and raising capital, regulatory changes and price competition. Changing interest rates could reduce the profitability of certain types of companies in the financial services sector. For example, rising interest rates increase the cost of financing to, and may reduce the profitability of, certain financial services companies. The financial services sector may be subject to a greater risk of rising interest rates due to the current period of historically low rates and the federal funds rate increases recently initiated by the Federal Reserve.
•
Management Risk — The Fund is subject to management risk because it is an actively managed investment portfolio. The sub-adviser will apply its investment techniques and risk analyses in making investment decisions for the Fund, but there is no guarantee that its decisions will produce the intended result. The Fund’s management strategy or security selection methods could prove less successful than anticipated or unsuccessful. This risk is common for all actively managed funds.
•
Derivatives Risk – The use of derivatives presents risks different from, and possibly greater than, the risks associated with investing directly in traditional securities as well as increased transaction costs. The use of derivatives can lead to losses because of adverse movements in the price or value of the underlying asset, reference rate or index. Derivative strategies often involve leverage, which may increase a loss, potentially causing the Fund to lose more money than it would have lost had it invested in the underlying security. Also, a liquid market may not always exist for the Fund’s derivative positions at times when the Fund might wish to terminate or sell such positions.
•
Leverage Risk – To the extent the Fund’s use of derivatives creates leverage, the value of the Fund’s shares may be more volatile because leverage will amplify the effect of increases or decreases in the value of the Fund’s derivative investments.
•
Call and Put Options Risk — A call option obligates the writer (or seller) of the option to sell a specified asset to the holder of the option at a specified price when the holder exercises the option prior to expiration. A put option obligates the writer (or seller) of the option to buy a specified asset from the holder of the option at a specified price when the holder exercises the option prior to expiration. A writer covers an option it has sold by maintaining segregated liquid assets or offsetting transactions, including other options, to cover its obligation under the option it has written. Writing covered call options may deprive the Fund of the opportunity to profit from an increase in the market price of the reference asset. Writing covered put options may subject the Fund to a decrease in the market price of the reference asset. Purchasing an option subjects the buyer to the risk that the benefit received from exercising the option, if any, will not exceed the premium paid to purchase the option. Options are wasting assets and expire, and as a result can expose the Fund to significant loss. Premiums from the sale of call options will result in short-term capital gains. The Fund will have no control over the exercise of the call options it writes and therefore may be forced to realize capital gains or losses at inopportune times.
•
Small- and Mid-Capitalization Companies Risk — The Fund may invest in the securities of companies with small and mid-capitalizations, which can involve greater risk and the possibility of greater portfolio volatility than investments in securities of large capitalization companies. Historically, stocks of small and mid-capitalization companies and recently organized companies have been more volatile in price than those of the larger market capitalization companies. Among the reasons for the greater price volatility is the lower degree of liquidity in the markets for such stocks. Small and mid-capitalization companies may have limited product lines and financial resources and may depend upon a limited or less experienced management group. The securities of small capitalization companies trade in the over-the-counter markets or on regional exchanges and may not be traded daily or in the volume typical of trading on a national securities exchange, which may make these securities more difficult to value and to sell.
•
Large-Cap Company Risk — Larger, more established companies may be unable to respond quickly to new competitive challenges, such as changes in consumer tastes or innovative smaller competitors. Also, large-cap companies are sometimes unable to attain the high growth rates of successful, smaller companies, especially during extended periods of economic expansion.
•
Micro Capitalization Companies Risk — Micro-cap stocks have a market capitalization of less than $300 million. Micro-cap companies may be less financially secure than large, mid or small capitalization companies. Micro-cap companies may be in the early stage of development or newly formed with limited markets or product lines. There may also be less public information about micro-cap companies. In addition, micro-cap companies that rely on smaller management teams may be vulnerable to key personnel losses. Micro-cap stock prices also may be more volatile than large, mid or small-cap stocks, may have lower trading volume and lower degree of liquidity which makes these securities difficult to value and to sell. The securities of micro-cap companies may not be traded daily. As a result, some of the Fund’s holdings may be considered or become illiquid.
•
Special Situations Risk — The Fund will seek to benefit from “special situations,” such as mergers, reorganizations, or other unusual events expected to affect a particular issuer. There is a risk that the “special situation” might not occur or involve longer time frames than originally expected, which could have a negative impact on the price of the issuer’s securities and fail to produce gains or produce a loss for the Fund.
Risk Lose Money [Text] rr_RiskLoseMoney The Fund’s share price fluctuates, which means you could lose money by investing in the Fund. The Fund is not a complete investment program and should be considered only as part of an investment portfolio. The principal risks of investing in the Fund are summarized below:
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading PAST PERFORMANCE
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual total returns for 1, 5 and 10 years compare with those of a broad measure of market performance. Bear in mind that past performance (before and after taxes) is not a guarantee of future performance.
The bar chart shows the annual total returns of the Fund’s Class A shares for each of the last ten calendar years. The returns in the bar chart do not include the effect of Class A shares’ front-end sales charges. These figures would be lower if they reflected such sales charges. The table presents the Fund’s average annual total returns over 1-, 5- and 10-year periods compared to the NASDAQ Bank Index, which represents a broad measure of market performance, and the Morningstar Financial Sector Category average, which represents the performance of the Fund’s peer group. The Funds included in the Morningstar Financial Sector Category are determined by Morningstar, Inc. The Fund’s performance figures assume that all distributions were reinvested in the Fund and do not reflect the deduction of the Fund’s maximum sales charges or its annual operating expenses. Updated performance information may be obtained on the Fund’s website at www.rmbfunds.com or by calling 1-800-462-2392.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual total returns for 1, 5 and 10 years compare with those of a broad measure of market performance.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-462-2392.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.rmbfunds.com or by calling 1-800-462-2392.
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Bear in mind that past performance (before and after taxes) is not a guarantee of future performance.
Bar Chart [Heading] rr_BarChartHeading RMB Mendon Financial Services Fund – Return for Class A Shares
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The returns in the bar chart do not include the effect of Class A shares’ front-end sales charges. These figures would be lower if they reflected such sales charges. The table presents the Fund’s average annual total returns over 1-, 5- and 10-year periods compared to the NASDAQ Bank Index, which represents a broad measure of market performance, and the Morningstar Financial Sector Category average, which represents the performance of the Fund’s peer group. The Funds included in the Morningstar Financial Sector Category are determined by Morningstar, Inc. The Fund’s performance figures assume that all distributions were reinvested in the Fund and do not reflect the deduction of the Fund’s maximum sales charges or its annual operating expenses. Updated performance information may be obtained on the Fund’s website at www.rmbfunds.com or by calling 1-800-462-2392.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best Quarter: 23.98% in the 4th Quarter of 2016
Worst Quarter: (19.67)% in the 4th Quarter of 2018
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (For the following periods ended 12/31/2018)
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads The Fund’s performance figures assume that all distributions were reinvested in the Fund and do not reflect the deduction of the Fund’s maximum sales charges or its annual operating expenses. Updated performance information may be obtained on the Fund’s website at www.rmbfunds.com or by calling 1-800-462-2392.
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction of fees, expenses or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements, such as 401(k) plans or IRAs.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown The after-tax returns are shown only for Class A shares; after-tax returns for Class C and Class I shares will vary.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher The “Total Return After Taxes on Distributions and Sale of Fund Shares” can be higher than other return figures when a capital loss occurs upon the redemption of Fund shares. If realized losses occur upon the sale of Fund shares, the capital loss is recorded as a tax benefit, which increases the return.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements, such as 401(k) plans or IRAs. The after-tax returns are shown only for Class A shares; after-tax returns for Class C and Class I shares will vary. The “Total Return After Taxes on Distributions and Sale of Fund Shares” can be higher than other return figures when a capital loss occurs upon the redemption of Fund shares. If realized losses occur upon the sale of Fund shares, the capital loss is recorded as a tax benefit, which increases the return.
RMB Mendon Financial Services Fund | NASDAQ Bank Index Total Return (reflects no deduction of fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel NASDAQ Bank Index Total Return (reflects no deduction of fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 (16.17%)
5 Years rr_AverageAnnualReturnYear05 6.85%
10 Years rr_AverageAnnualReturnYear10 7.20%
RMB Mendon Financial Services Fund | Morningstar Financial Sector Category (reflects no deduction of fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Morningstar Financial Sector Category (reflects no deduction of fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 (15.66%)
5 Years rr_AverageAnnualReturnYear05 4.07%
10 Years rr_AverageAnnualReturnYear10 9.01%
RMB Mendon Financial Services Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.75%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.27%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.27%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 623
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 883
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,162
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,957
Annual Return 2009 rr_AnnualReturn2009 18.90%
Annual Return 2010 rr_AnnualReturn2010 2.07%
Annual Return 2011 rr_AnnualReturn2011 (10.34%)
Annual Return 2012 rr_AnnualReturn2012 23.35%
Annual Return 2013 rr_AnnualReturn2013 35.42%
Annual Return 2014 rr_AnnualReturn2014 11.11%
Annual Return 2015 rr_AnnualReturn2015 20.43%
Annual Return 2016 rr_AnnualReturn2016 29.74%
Annual Return 2017 rr_AnnualReturn2017 11.99%
Annual Return 2018 rr_AnnualReturn2018 (17.02%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2016
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 23.98%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2018
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (19.67%)
RMB Mendon Financial Services Fund | Class C  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.75%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.27%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.02%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 305
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 634
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,088
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,348
RMB Mendon Financial Services Fund | Class I  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.75%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.27%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.02%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 104
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 325
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 563
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,248
RMB Mendon Financial Services Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Total Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (21.17%)
5 Years rr_AverageAnnualReturnYear05 8.91%
10 Years rr_AverageAnnualReturnYear10 10.79%
RMB Mendon Financial Services Fund | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Total Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 (22.19%)
5 Years rr_AverageAnnualReturnYear05 7.87%
10 Years rr_AverageAnnualReturnYear10 10.24%
RMB Mendon Financial Services Fund | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Total Return After Taxes on Distributions and Sale of Fund Shares1
1 Year rr_AverageAnnualReturnYear01 (11.93%) [3]
5 Years rr_AverageAnnualReturnYear05 7.00% [3]
10 Years rr_AverageAnnualReturnYear10 8.94% [3]
RMB Mendon Financial Services Fund | Class C  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Total Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (18.43%)
5 Years rr_AverageAnnualReturnYear05 9.21%
10 Years rr_AverageAnnualReturnYear10 10.54%
RMB Mendon Financial Services Fund | Class I  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Total Return Before Taxes2
1 Year rr_AverageAnnualReturnYear01 (16.84%) [4]
5 Years rr_AverageAnnualReturnYear05 10.31% [4]
10 Years rr_AverageAnnualReturnYear10 11.50% [4]
RMB Mendon Financial Long/Short Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading RMB Mendon Financial Long/Short Fund
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The RMB Mendon Financial Long/Short Fund (the “Fund”) seeks capital appreciation.
There can be no assurance that the Fund will be successful in achieving its investment objective.
Expense [Heading] rr_ExpenseHeading FEES AND EXPENSES OF THE FUND
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
The table below describes the fees and expenses you may pay if you buy and hold shares of the Fund. 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 professional and in the “Choosing a Share Class” section on page 52 of this prospectus and the “Purchase and Redemption of Shares” section of the Fund’s Statement of Additional Information.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading PORTFOLIO TURNOVER
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
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 67% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 67.00%
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
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 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. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption Narrative [Text Block] rr_ExpenseExampleNoRedemptionNarrativeTextBlock
You would pay the following expenses if you did not redeem your shares:
Strategy [Heading] rr_StrategyHeading PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund pursues its investment objective by investing, under normal circumstances, at least 80% of its net assets (plus any borrowings for investment purposes) in the common stocks of U.S. companies of any market capitalization that are in the financial services sector. The Fund includes the market value of derivatives that provide exposure to the financial services sector in determining compliance with the Fund’s 80% investment policy. The Fund will take long and short positions in companies in the financial services sector of any size. The portion invested in small, medium or large companies is expected to vary over time. The Fund is not designed to be market neutral. The Fund is non-diversified and may invest a larger portion of its assets in the securities of a single company than diversified mutual funds.
For purposes of selecting investments, the Fund defines the financial services sector broadly. It includes (but is not limited to) the following:
•
Banks
•
Insurance companies
•
Consumer and commercial finance companies
•
Securities brokerage firms and electronic trading networks
•
Investment management and advisory firms
•
Financial conglomerates
•
Financial technology companies
•
Real Estate Investment Trusts
The portfolio manager constructs the Fund’s portfolio using both a top-down and bottom-up analysis. Examples of top-down analysis include the study of interest rates, credit trends and other macroeconomic factors that broadly affect the financial services sector. Examples of bottom-up analysis include industry screens, sell-side company research reports, company models and other fundamental research that are used to construct the Fund’s portfolio on a stock-by-stock basis. The sub-adviser attempts to identify how various financial services sub-sectors and the individual companies therein will move in reaction to market events. Each potential investment is evaluated by weighing its potential for gain against its associated risks. Because of the way the sub-adviser constructs the Fund’s portfolio, there may be times when the Fund’s investments are focused in one or more financial services sub-sectors and/or a limited number of regions of the U.S.
The Fund takes “short” positions (i.e., sell “short”) in securities of companies believed to be overvalued, with a maximum short exposure limit of 25% of net assets. When taking a “short” equity position, the Fund borrows the security from a third party and sells it at the then current market price. A “short” equity position will benefit from a decrease in price of the security and will lose value if the price of the security increases. Selling short may serve to hedge the Fund’s long portfolio in periods of market decline and to use negative information about companies gained from the sub-adviser’s research to the Fund’s advantage. A strategy involving selling a particular security short is separate and distinct from a strategy of buying and then selling the underlying security itself.
The Fund may sell securities or close a short position for a variety of reasons, such as to secure gains, limit losses or redeploy assets into other opportunities.
The Fund also uses futures and/or options on securities, indices and other derivatives (a type of instrument whose value is determined by reference to the value or the change in value of one or more securities, indices or other financial instruments) to hedge against market changes or as a substitute for securities transactions. It may also use derivatives in attempts to profit from anticipated market and security movements or as an alternative to selling a security short. The Fund expects that its primary investments in derivatives will be in written covered call options and long put options. As the writer of a covered call option, the Fund forgoes, during the option’s life, the opportunity to profit from increases in the market value of the security covering the call option above the sum of the premium and the strike price of the call, but has retained the risk of loss should the price of the underlying security decline. Long put option purchases allow the option holder to sell or “put” the underlying security at the contract strike price at a future date. If the price of the underlying security declines in value, the value of the long put option increases. Options are wasting assets and expire, and as a result can expose the Fund to significant loss.
The Fund’s use of derivatives will have the economic effect of financial leverage. Financial leverage magnifies exposure to the swings in prices of an asset underlying a derivative instrument and results in increased volatility, which means the Fund will have the potential for greater gains, as well as the potential for greater losses, than if the Fund does not use derivatives instruments that have a leveraging effect. Leveraging tends to magnify, sometimes significantly, the effect of any increase or decrease in the Fund’s exposure to an asset and may cause the Fund’s net asset value per share to be volatile.
Risk [Heading] rr_RiskHeading PRINCIPAL RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
As with any mutual fund, there is no guarantee that the Fund will achieve its objective. The Fund’s share price fluctuates, which means you could lose money by investing in the Fund. The Fund is not a complete investment program and should be considered only as part of an investment portfolio. The principal risks of investing in the Fund are summarized below:
•
Market Risk — This is the risk that the price of a security will fall due to changing economic, political or market conditions, or due to a company’s individual situation. The risk would be greater if any of the categories of securities that the Fund emphasizes — mid and small-capitalization stocks or particular sectors or sub-sectors — fell out of favor with the market. Companies in the Fund’s portfolio could fail to achieve earnings estimates or other market expectations, causing their stock prices to drop.
•
Equity Securities Risk — The risk that the market price of common stocks and other equity securities, including preferred stocks, warrants and rights, may go up or down, sometimes rapidly or unpredictably, including due to factors affecting equity securities markets generally, particular industries represented in those markets, or the issuer itself.
•
Financial Services Sector Risk — A fund that focuses its investments in specific industries or sectors is more susceptible to developments affecting those industries and sectors than a more broadly diversified fund would be. Because the Fund invests significantly in the financial services sector, the Fund may perform poorly during a downturn in the financial services industry. The financial services sector can be significantly affected by changes in interest rates, the rate of corporate and consumer debt defaults, the availability and cost of borrowing and raising capital, regulatory changes and price competition. Changing interest rates could reduce the profitability of certain types of companies in the financial services sector. For example, rising interest rates increase the cost of financing to, and may reduce the profitability of, certain financial services companies. The financial services sector may be subject to a greater risk of rising interest rates due to the current period of historically low rates and the federal funds rate increases recently initiated by the Federal Reserve.
•
Short Sale Risk — Selling short may produce higher than normal portfolio turnover and result in increased transaction costs to the Fund. In addition, selling short magnifies the potential for loss to the Fund and its shareholders. If a security sold short increases in price, the Fund may have to cover its short position at a higher price than the short sale price, resulting in a loss, which can be unlimited.
•
Management Risk — The Fund is subject to management risk because it is an actively managed investment portfolio. The sub-adviser will apply its investment techniques and risk analyses in making investment decisions for the Fund, but there is no guarantee that its decisions will produce the intended result. The Fund’s management strategy or security selection methods could prove less successful than anticipated or unsuccessful. This risk is common for all actively managed funds.
•
Derivatives Risk – The use of derivatives presents risks different from, and possibly greater than, the risks associated with investing directly in traditional securities as well as increased transaction costs. The use of derivatives can lead to losses because of adverse movements in the price or value of the underlying asset, reference rate or index. Derivative strategies often involve leverage, which may increase a loss, potentially causing the Fund to lose more money than it would have lost had it invested in the underlying security. Also, a liquid market may not always exist for the Fund’s derivative positions at times when the Fund might wish to terminate or sell such positions.
•
Leverage Risk – To the extent the Fund’s use of derivatives creates leverage, the value of the Fund’s shares may be more volatile because leverage will amplify the effect of increases or decreases in the value of the Fund’s derivative investments.
•
Call and Put Options Risk — A call option obligates the writer (or seller) of the option to sell a specified asset to the holder of the option at a specified price when the holder exercises the option prior to expiration. A put option obligates the writer (or seller) of the option to buy a specified asset from the holder of the option at a specified price when the holder exercises the option prior to expiration. A writer covers an option it has sold by maintaining segregated liquid assets or offsetting transactions, including other options, to cover its obligation under the option it has written. Writing covered call options may deprive the Fund of the opportunity to profit from an increase in the market price of the reference asset. Writing covered put options may subject the Fund to a decrease in the market price of the reference asset. Purchasing an option subjects the buyer to the risk that the benefit received from exercising the option, if any, will not exceed the premium paid to purchase the option. Options are wasting assets and expire, and as a result can expose the Fund to significant losses. Premiums from the sale of call options will result in short-term capital gains. The Fund will have no control over the exercise of the call options it writes and therefore may be forced to realize capital gains or losses at inopportune times.
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Micro Capitalization Companies Risk — Micro-cap stocks have a market capitalization of less than $300 million. Micro-cap companies may be less financially secure than large, mid or small capitalization companies. Micro-cap companies may be in the early stage of development or newly formed with limited markets or product lines. There may also be less public information about micro-cap companies. In addition, micro-cap companies that rely on smaller management teams may be vulnerable to key personnel losses. Micro-cap stock prices also may be more volatile than large, mid or small-cap stocks, may have lower trading volume and lower degree of liquidity which makes these securities difficult to value and to sell. The securities of micro-cap companies may not be traded daily. As a result, some of the Fund’s holdings may be considered or become illiquid
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Small- and Mid-Capitalization Companies Risk — Historically, stocks of small and mid-capitalization companies and recently organized companies have been more volatile in price than those of the larger market capitalization companies. Among the reasons for the greater price volatility is the lower degree of liquidity in the markets for such stocks, which may make these securities difficult to value and to sell. As a result, some of the Fund’s small-cap holdings may be considered or become illiquid. Such companies also may have limited product lines and financial resources and may depend upon a limited or less experienced management group.
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Large-Cap Company Risk — Larger, more established companies may be unable to respond quickly to new competitive challenges, such as changes in consumer tastes or innovative smaller competitors. Also, large-cap companies are sometimes unable to attain the high growth rates of successful, smaller companies, especially during extended periods of economic expansion.
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Non-Diversification Risk — Matters affecting the stock price of a single company in which the Fund invests may have a greater impact on the Fund’s share price than in a diversified Fund. Such non-diversification will increase the volatility of the value of the Fund’s portfolio investments.
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Portfolio Turnover Risk — The portfolio turnover rate measures the frequency with which the Fund sells and replaces its securities within a given period. The Fund anticipates that it will experience a high portfolio turnover rate. High turnover can increase the Fund’s transaction costs, thereby lowering its returns. It also may increase your tax liability
Risk Lose Money [Text] rr_RiskLoseMoney The Fund’s share price fluctuates, which means you could lose money by investing in the Fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading PAST PERFORMANCE
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual total returns for 1, 5 and 10 years compare with those of a broad measure of market performance. Bear in mind that past performance (before and after taxes) is not a guarantee of future performance.
The bar chart shows the annual total returns of the Fund’s Class A shares for each of the last ten calendar years. The returns in the bar chart do not include the effect of Class A shares’ front-end sales charges. These figures would be lower if they reflected such sales charges. The table presents the Fund’s average annual total returns for 1-, 5- and 10-year periods compared to the KBW Bank Index, which represents a broad measure of market performance, and the Morningstar Long/Short Category average, which represents the performance of the Fund’s peer group. The funds included in the Morningstar Long/Short Category are determined by Morningstar, Inc. The Fund’s performance figures assume that all distributions were reinvested in the Fund and do not reflect the deduction of the Fund’s maximum sales charges or its annual operating expenses. Updated performance information may be obtained on the Fund’s website at www.rmbfunds.com or by calling 1-800-462-2392.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual total returns for 1, 5 and 10 years compare with those of a broad measure of market performance.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-462-2392
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.rmbfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Bear in mind that past performance (before and after taxes) is not a guarantee of future performance.
Bar Chart [Heading] rr_BarChartHeading RMB Mendon Financial Long/Short Fund – Return for Class A Shares
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The returns in the bar chart do not include the effect of Class A shares’ front-end sales charges. These figures would be lower if they reflected such sales charges. The table presents the Fund’s average annual total returns for 1-, 5- and 10-year periods compared to the KBW Bank Index, which represents a broad measure of market performance, and the Morningstar Long/Short Category average, which represents the performance of the Fund’s peer group. The funds included in the Morningstar Long/Short Category are determined by Morningstar, Inc.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best Quarter: 20.67% in the 2nd Quarter of 2009
Worst Quarter: (20.09)% in the 3rd Quarter of 2011
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (For the following periods ended 12/31/2018)
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads The Fund’s performance figures assume that all distributions were reinvested in the Fund and do not reflect the deduction of the Fund’s maximum sales charges or its annual operating expenses.
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction of fees, expenses or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements, such as 401(k) plans or IRAs.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown The after-tax returns are shown only for Class A shares; after-tax returns for Class C and Class I shares will vary.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher The “Total Return After Taxes on Distributions and Sale of Fund Shares” can be higher than other return figures when a capital loss occurs upon the redemption of Fund shares. If realized losses occur upon the sale of Fund shares, the capital loss is recorded as a tax benefit, which increases the return.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements, such as 401(k) plans or IRAs. The after-tax returns are shown only for Class A shares; after-tax returns for Class C and Class I shares will vary. The “Total Return After Taxes on Distributions and Sale of Fund Shares” can be higher than other return figures when a capital loss occurs upon the redemption of Fund shares. If realized losses occur upon the sale of Fund shares, the capital loss is recorded as a tax benefit, which increases the return.
RMB Mendon Financial Long/Short Fund | S&P 500® Index Total Return (reflects no deduction of fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel S&P 500® Index Total Return (reflects no deduction of fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 (4.38%)
5 Years rr_AverageAnnualReturnYear05 8.49%
10 Years rr_AverageAnnualReturnYear10 13.12%
RMB Mendon Financial Long/Short Fund | The KBW Bank Index Total Return (reflects no deduction of fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel The KBW Bank Index Total Return (reflects no deduction of fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 (17.71%)
5 Years rr_AverageAnnualReturnYear05 6.63%
10 Years rr_AverageAnnualReturnYear10 8.92%
RMB Mendon Financial Long/Short Fund | Morningstar Long/Short Category (reflects no deduction of fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Morningstar Long/Short Category (reflects no deduction of fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 (6.54%)
5 Years rr_AverageAnnualReturnYear05 2.07%
10 Years rr_AverageAnnualReturnYear10 6.49%
RMB Mendon Financial Long/Short Fund | Class C  
Prospectus [Line Items] rr_ProspectusLineItems  
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 $ 205
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 634
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,088
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,348
RMB Mendon Financial Long/Short Fund | Class I  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
RMB Mendon Financial Long/Short Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.90% [5]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.30%
Component2 Other Expenses rr_Component2OtherExpensesOverAssets 0.29% [6]
Component3 Other Expenses rr_Component3OtherExpensesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.54%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.74% [7]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 668
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,021
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,397
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,449
Annual Return 2009 rr_AnnualReturn2009 31.00%
Annual Return 2010 rr_AnnualReturn2010 2.41%
Annual Return 2011 rr_AnnualReturn2011 (15.26%)
Annual Return 2012 rr_AnnualReturn2012 25.16%
Annual Return 2013 rr_AnnualReturn2013 23.52%
Annual Return 2014 rr_AnnualReturn2014 12.08%
Annual Return 2015 rr_AnnualReturn2015 15.10%
Annual Return 2016 rr_AnnualReturn2016 9.08%
Annual Return 2017 rr_AnnualReturn2017 (3.07%)
Annual Return 2018 rr_AnnualReturn2018 (20.09%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 20.67%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (20.09%)
Label rr_AverageAnnualReturnLabel Total Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (24.09%)
5 Years rr_AverageAnnualReturnYear05 0.70%
10 Years rr_AverageAnnualReturnYear10 6.19%
RMB Mendon Financial Long/Short Fund | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Total Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 (24.09%)
5 Years rr_AverageAnnualReturnYear05 0.30%
10 Years rr_AverageAnnualReturnYear10 5.61%
RMB Mendon Financial Long/Short Fund | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Total Return After Taxes on Distributions and Sale of Fund Shares1
1 Year rr_AverageAnnualReturnYear01 (14.26%) [8]
5 Years rr_AverageAnnualReturnYear05 0.49% [8]
10 Years rr_AverageAnnualReturnYear10 4.83% [8]
RMB Mendon Financial Long/Short Fund | Class C  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.90% [5]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Component2 Other Expenses rr_Component2OtherExpensesOverAssets 0.31% [6]
Component3 Other Expenses rr_Component3OtherExpensesOverAssets 0.22%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.53%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.43% [7]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 346
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 758
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,296
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,766
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 246
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 758
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,296
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,766
Label rr_AverageAnnualReturnLabel Total Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (21.48%)
5 Years rr_AverageAnnualReturnYear05 1.01%
10 Years rr_AverageAnnualReturnYear10 5.97%
RMB Mendon Financial Long/Short Fund | Class I  
Prospectus [Line Items] rr_ProspectusLineItems  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.90% [5]
Component2 Other Expenses rr_Component2OtherExpensesOverAssets 0.33% [6]
Component3 Other Expenses rr_Component3OtherExpensesOverAssets 0.21%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.54%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.44% [7]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 147
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 456
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 787
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,724
Label rr_AverageAnnualReturnLabel Total Return Before Taxes2
1 Year rr_AverageAnnualReturnYear01 (19.87%) [9]
5 Years rr_AverageAnnualReturnYear05 1.96% [9]
10 Years rr_AverageAnnualReturnYear10 6.85% [9]
RMB International Small Cap Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading RMB International Small Cap Fund
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The RMB International Small Cap Fund (the “Fund”) seeks long-term capital appreciation.
There can be no assurance that the Fund will be successful in achieving its investment objective.
Expense [Heading] rr_ExpenseHeading FEES AND EXPENSES OF THE FUND
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
The table below describes the fees and expenses you may pay if you buy and hold shares of the Fund.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading PORTFOLIO TURNOVER
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
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 69% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 69.00%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
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] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund pursues its investment objective by investing, under normal conditions, at least 80% of its net assets (plus any borrowings for investment purposes) in small capitalization companies. The Adviser defines a small capitalization company as any company with a market capitalization less than or equal to the largest market capitalization of any company in the MSCI EAFE Small Cap Index, at the time of purchase, which, as of March 29, 2019, was approximately $9.98 billion. Under normal conditions, the Fund will invest in at least three different countries and will invest at least 40% of its total assets in securities of non-U.S. issuers organized or having their principal place of business outside the U.S. or doing a substantial amount (more than 50%) of business outside the U.S. Investments in exchange-traded funds (“ETFs”) based on non-U.S. market indices are considered investments outside the U.S. for purposes of the 40% requirement noted above. At times the Fund may increase the relative emphasis of its investments in a particular region, country, sector, industry or other segment of the market.
The Fund’s non-U.S. investments will be primarily in developed markets, but the Fund may invest in emerging markets. As of the date of this Prospectus, the Adviser believes that developed markets outside the United States include, but may not be limited to, the following: Austria, Australia, Belgium, Canada, Denmark, Finland, France, Germany, Hong Kong, Ireland, Israel, Italy, Japan, Netherlands, New Zealand, Norway, Portugal, Singapore, Spain, Sweden, Switzerland and the United Kingdom. The Fund considers emerging markets to be markets located in countries classified as emerging or frontier markets by MSCI, and are generally located in the Asia Pacific region, Eastern Europe, the Middle East, Central and South America and Africa. There are no geographic limits on the Fund’s non-U.S. investments.
The Fund primarily invests in equity securities, including common stocks, preferred stocks, warrants and other rights and securities convertible into or exchangeable for common stocks. The Fund may also invest in pooled investment vehicles (primarily ETFs); real estate investment trusts (“REITs”); and initial public offerings (“IPOs”). The investments may be hedged or unhedged to foreign currencies depending on the market opportunities. Although most of the Fund’s investments must be liquid at the time of investment, the Fund may invest, to some extent, in securities that are restricted or illiquid. The Fund may also invest in depositary receipts, including American, European and Global Depository Receipts.
The Adviser uses a fundamental, bottom up approach to identify what it believes are quality companies, as evidenced by the durability of the company’s business model (strong competitive advantages and high barriers to entry), the company’s financial strength (greater returns on capital, free cash flow generation, healthy balance sheets), the presence of long-term growth, and value-accretive management teams.
From time to time the Fund may invest in companies that are experiencing unusual and possibly unique developments. Potential investments in the stock of these companies are usually the result of companies uncovered in the research process that are otherwise outside of the standard investment criteria employed by the Fund but may have opportunities for significant returns. These companies are deemed “special situations.” Special situations include companies going through reorganizations, recapitalizations, mergers, spin-offs or facing resolutions of litigation, management team changes or important technological improvements or discoveries.
The Fund will buy such quality companies when the Adviser believes their fundamentals are mispriced relative to their long-term potential and when their stock prices reflect reasonable valuations. The Fund will sell companies when fundamentals deteriorate, thus impairing the long-term quality of the business; when the market price exceeds the Adviser’s estimate of intrinsic value; when the Adviser’s investment thesis supporting its decision to purchase and hold the company is no longer valid; and/or when the Adviser believes a more attractive risk/reward opportunity exists.
Risk [Heading] rr_RiskHeading PRINCIPAL RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
As with any mutual fund, there is no guarantee that the Fund will achieve its objective. The Fund’s share price fluctuates, which means you could lose money by investing in the Fund. The Fund is not a complete investment program and should be considered only as part of an investment portfolio. The principal risks of investing in the Fund are summarized below:
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Market Risk — This is the risk that the price of a security will fall due to changing economic, political or market conditions, or due to a company’s individual situation. The risk would be greater if any of the categories of securities that the Fund emphasizes fell out of favor with the market. Companies in the Fund’s portfolio could fail to achieve earnings estimates or other market expectations, causing their stock prices to drop.
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Foreign Investing Risk — Foreign securities may underperform U.S. securities and may be more volatile than U.S. securities. Risks relating to investments in foreign securities (including, but not limited to, depositary receipts and participation certificates) and to securities of issuers with significant exposure to foreign markets include currency exchange rate fluctuation; less available public information about the issuers of securities; less stringent regulatory standards; lack of uniform accounting, auditing and financial reporting standards; imposition of foreign withholding and other taxes; country risks, including less liquidity, high inflation rates and unfavorable economic practices; and political instability and expropriation and nationalization risks.
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Emerging Markets Risk — Investment risks typically are greater in emerging and less developed markets. For example, in addition to the risks associated with investments in any foreign country, political, legal and economic structures in these less developed countries may be new and changing rapidly, which may cause instability and greater risk of loss. Their securities markets may be less developed, and securities in those markets are generally more volatile and less liquid than those in the developed markets. Investing in emerging market countries may involve substantial risk due to, among other reasons, limited information; higher brokerage costs; different accounting, auditing and financial reporting standards; less developed legal systems and thinner trading markets as compared to those in developed countries; different clearing and settlement procedures and custodial services; and currency blockages or transfer restrictions. Emerging market countries also are more likely to experience high levels of inflation, deflation or currency devaluations, which could hurt their economies and securities markets. Certain emerging markets also may face other significant internal or external risks, including a heightened risk of war or ethnic, religious or racial conflicts. In addition, governments in many emerging market countries participate to a significant degree in their economies and securities markets, which may impair investment and economic growth of companies in those markets. Such markets may also be heavily reliant on foreign capital and, therefore, vulnerable to capital flight.
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Currency Risk — Foreign securities usually are denominated and traded in foreign currencies and the exchange rates between foreign currencies and the U.S. dollar fluctuate continuously. The Fund’s performance will be affected by its direct or indirect exposure, which may include exposure through U.S. dollar denominated depositary receipts and participation certificates, to a particular currency due to favorable or unfavorable changes in currency exchange rates relative to the U.S. dollar. The Fund’s direct or indirect exposure to a particular currency may be hedged to mitigate currency volatility or because the Fund believes a currency is overvalued. There can be no guarantee that any hedging activity will be successful. Hedging activity and/or use of forward foreign currency contracts may reduce or limit the opportunity for gain and involves counterparty risk, which is the risk that the contracting party will not fulfill its contractual obligation to deliver the currency contracted for at the agreed upon price to the Fund.
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Equity Securities Risk — The risk that the market price of common stocks and other equity securities, including preferred stocks, warrants and rights, may go up or down, sometimes rapidly or unpredictably, including due to factors affecting equity securities markets generally, particular industries represented in those markets, or the issuer itself.
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Pooled Investment Vehicle Risk —The Fund will indirectly bear its proportionate share of any fees and expenses payable directly by any other pooled investment vehicle in which the Fund invests (primarily ETFs). Therefore, the Fund will incur higher expenses, some of which could be considered duplicative. In addition, the Fund may be affected by losses of the underlying investment vehicle and the level of risk arising from the investment practices of the underlying investment vehicle (such as the use of leverage). The Fund has no control over the risks taken by the underlying investment vehicle in which it invests.
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REIT Risk — The Fund’s investments in real estate related securities (primarily REITs) are subject to the risk that the value of the real estate underlying the securities will go down, which can be caused by deteriorating economic conditions and rising interest rates, and may also be subject to the risk that borrowers or tenants may default on their payment obligations. Investments in REITs involve additional risks. REITs may have limited financial resources and real estate diversification and are dependent on specialized management skills. In addition, the failure of a REIT to qualify as a REIT for federal income tax purposes would adversely affect the REIT’s value.
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Depositary Receipts Risk — The Fund’s investments in depositary receipts include American Depositary Receipts (“ADRs”), Global Depositary Receipts (“GDRs”) and European Depositary Receipts (“EDRs”). ADRs are receipts issued by U.S. banks evidencing ownership in securities of foreign issuers, and GDRs and EDRs are receipts issued by banks in more than one country evidencing ownership in securities of foreign issuers. Although depositary receipts have risks similar to the foreign securities that they represent, they may also involve higher expenses and may trade at a discount (or premium) to the underlying security. In addition, depositary receipts may not pass through voting and other shareholder rights, and may be less liquid than the underlying securities listed on an exchange.
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IPO Risk —The prices of securities purchased in IPOs tend to fluctuate more widely than securities of companies that have been publicly traded for a longer period of time. Securities purchased in IPOs generally do not have a trading history, and information about the issuers of such securities may be available for very limited periods. At any particular time or from time to time a Fund may not be able to invest in securities issued in IPOs, or invest to the extent desired because, for example, only a small portion (if any) of the securities being offered in an IPO may be made available to the Fund. In addition, under certain market conditions a relatively small number of companies may issue securities in IPOs. There can be no assurance that investments in IPOs will be available to the Fund or improve the Fund’s performance.
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Management Risk — The Fund is subject to management risk because it is an actively managed investment portfolio. The Adviser will apply its investment techniques and risk analyses in making investment decisions for the Fund, but there is no guarantee that its decisions will produce the intended result. The Fund’s management strategy or security selection methods could prove less successful than anticipated or unsuccessful. This risk is common for all actively managed funds.
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Small Capitalization Company Risk — The Fund may invest in the securities of companies with small capitalizations, which can involve greater risk and the possibility of greater portfolio volatility than investments in securities of mid and large capitalization companies. Historically, securities of small capitalization companies and recently organized companies have been more volatile in price than those of the larger market capitalization companies. Among the reasons for the greater price volatility is the lower degree of liquidity in the markets for such securities. Small capitalization companies may have limited product lines and financial resources and may depend upon a limited or less experienced management group. The securities of some small capitalization companies trade in the over-the-counter markets or on regional exchanges and may not be traded daily or in the volume typical of trading on a national securities exchange, which may make these securities more difficult to value and to sell.
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Micro Capitalization Companies Risk — Securities of micro-cap companies have a market capitalization of less than $300 million. Micro-cap companies may be less financially secure than large, mid or small-capitalization companies. Micro-cap companies may be in the early stage of development or newly formed with limited markets or product lines. There may also be less public information about micro-cap companies. In addition, micro-cap companies that rely on smaller management teams may be vulnerable to key personnel losses. Micro-cap securities prices that are more volatile than the prices of large, mid or small-cap stocks, and may have lower trading volumes and a lower degree of liquidity which makes these securities difficult to value and to sell. The securities of micro-cap companies may not be traded daily. As a result, some of the Fund’s holdings may be considered or become illiquid.
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Liquidity Risk — Liquidity risk exists when particular investments are difficult to sell, and such investments (particularly investments deemed to be illiquid) may be harder to value. If the Fund sells these investments to meet shareholder redemption requests or for other purposes, the Fund may suffer a loss.
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Restricted Securities Risk — Restricted securities are privately-placed securities whose resale is restricted under the U.S. securities laws. The Fund may invest in restricted securities, including unregistered securities eligible for resale without registration pursuant to Rule 144A (“Rule 144A Securities”) and privately-placed securities of U.S. and non-U.S. issuers offered outside the U.S. without registration with the U.S. Securities and Exchange Commission pursuant to Regulation S (“Regulation S Securities”) under the 1933 Act. Rule 144A Securities and Regulation S Securities may be freely traded among certain qualified institutional investors, such as the Fund, but whose resale in the U.S. is permitted only in limited circumstances. Investing in Rule 144A Securities and Regulation S Securities may increase the illiquidity of the Fund’s investments in the event that an adequate trading market does not exist for these securities.
•
Growth Investing Risk — Growth stocks may fall out of favor with investors and underperform other asset types during given periods. A company may never achieve the earnings growth the Adviser anticipated.
•
Value Investing Risk — Value stocks may not increase in price, may not issue the anticipated stock dividends or may decline in price, based upon the market’s belief of the issuer’s intrinsic worth.
•
Region, Country, Sector or Industry Focus Risk — The prices of securities of issuers in a particular region, country, sector, industry or other segment of the market may be more volatile due to changes in economic or business conditions, government regulations, availability of basic resources or supplies, or other events that affect that market segment more than securities of issuers in other market segments, and such volatility will cause fluctuations in the Fund’s share price to the extent that the Fund emphasizes its investments in that region, county, sector, industry or other market segment.
•
Special Situations Risk — The Fund will seek to benefit from “special situations,” such as mergers, reorganizations, or other unusual events expected to affect a particular issuer. There is a risk that the “special situation” might not occur or involve longer time frames than originally expected, which could have a negative impact on the price of the issuer’s securities and fail to produce gains or produce a loss for the Fund.
•
Newer Fund Risk — The Fund has a short operating history and may not attract sufficient assets to achieve or maximize investment and operational efficiencies.
Risk Lose Money [Text] rr_RiskLoseMoney The Fund’s share price fluctuates, which means you could lose money by investing in the Fund. The Fund is not a complete investment program and should be considered only as part of an investment portfolio. The principal risks of investing in the Fund are summarized below:
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading PAST PERFORMANCE
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance for its first full year of operation and by showing how the Fund’s average annual total returns for its first full year and since inception compare with those of a broad measure of market performance. Bear in mind that past performance (before and after taxes) is not a guarantee of future performance.
The bar chart shows the annual total returns of the Fund’s Class I shares for its first full year of operation. The table presents the Fund’s average annual total returns for the 1-year and since inception periods. The Fund’s performance figures assume that all distributions were reinvested in the Fund and do not reflect its annual operating expenses. Updated performance information may be obtained on the Fund’s website at www.rmbfunds.com or by calling 1-800-462-2392.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance for its first full year of operation and by showing how the Fund’s average annual total returns for its first full year and since inception compare with those of a broad measure of market performance.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-462-2392
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.rmbfunds.com or by calling 1-800-462-2392
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Bear in mind that past performance (before and after taxes) is not a guarantee of future performance.
Bar Chart [Heading] rr_BarChartHeading RMB International Small Cap Fund – Return for Class I Shares
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best Quarter: 2.40% in the 1st Quarter of 2018
Worst Quarter: (20.09)% in the 4th Quarter of 2018
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (For the following periods ended 12/31/2018)
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads The Fund’s performance figures assume that all distributions were reinvested in the Fund and do not reflect its annual operating expenses.
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction of fees, expenses or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements, such as 401(k) plans or IRAs.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher The “Total Return After Taxes on Distributions and Sale of Fund Shares” can be higher than other return figures when a capital loss occurs upon the redemption of Fund shares. If realized losses occur upon the sale of Fund shares, the capital loss is recorded as a tax benefit, which increases the return.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements, such as 401(k) plans or IRAs. The “Total Return After Taxes on Distributions and Sale of Fund Shares” can be higher than other return figures when a capital loss occurs upon the redemption of Fund shares. If realized losses occur upon the sale of Fund shares, the capital loss is recorded as a tax benefit, which increases the return. No returns are provided for Investor Class shares, which have not been offered for sale.
RMB International Small Cap Fund | MSCI EAFE Small Cap Index (reflects no deduction of fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel MSCI EAFE Small Cap Index (reflects no deduction of fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 (17.89%)
Since Inception rr_AverageAnnualReturnSinceInception (17.12%) [10]
RMB International Small Cap Fund | Investor Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.85%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 1.52%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.63%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (1.12%) [11]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.51% [12]
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 5/1/2020
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 154
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 711
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,295
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,881
RMB International Small Cap Fund | Class I  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.85%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 1.52%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.38%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (1.12%) [11]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.26% [12]
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 5/1/2020
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 128
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 635
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,169
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,631
Annual Return 2018 rr_AnnualReturn2018 (22.81%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2018
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 2.40%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2018
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (20.09%)
Label rr_AverageAnnualReturnLabel Total Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (22.81%)
Since Inception rr_AverageAnnualReturnSinceInception (22.51%) [10]
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 27, 2017
RMB International Small Cap Fund | Class I | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Total Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 (22.81%)
Since Inception rr_AverageAnnualReturnSinceInception (22.52%) [10]
RMB International Small Cap Fund | Class I | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Total Return After Taxes on Distributions and Sale of Fund Shares2
1 Year rr_AverageAnnualReturnYear01 (13.43%) [13]
Since Inception rr_AverageAnnualReturnSinceInception (17.11%) [13]
RMB International Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading RMB International Fund
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The RMB International Fund (the “Fund”) seeks long-term capital appreciation.
There can be no assurance that the Fund will be successful in achieving its investment objective.
Expense [Heading] rr_ExpenseHeading FEES AND EXPENSES OF THE FUND
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
The table below describes the fees and expenses you may pay if you buy and hold shares of the Fund.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading PORTFOLIO TURNOVER
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
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 28% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 28.00%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
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] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be: 1 year3 years5 years10 yearsInvestor Class$144$448$775$1,701Class I$118$371$643$1,419
Strategy [Heading] rr_StrategyHeading PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund pursues its investment objective by investing, under normal conditions, in at least three different countries and at least 40% of its total assets in securities of non-U.S. issuers organized or having their principal place of business outside the U.S. or doing a substantial amount (more than 50%) of business outside the U.S. Investments in exchange-traded funds (“ETFs”) based on non-U.S. market indices are considered investments outside the U.S. for purposes of the 40% requirement noted above.
The Fund’s non-U.S. investments will be primarily in developed markets, but the Fund may invest in emerging markets. As of the date of this Prospectus, the Adviser believes that developed markets outside the United States include, but may not be limited to, the following: Austria, Australia, Belgium, Canada, Denmark, Finland, France, Germany, Hong Kong, Ireland, Israel, Italy, Japan, Netherlands, New Zealand, Norway, Portugal, Singapore, Spain, Sweden, Switzerland and the United Kingdom. The Fund considers emerging markets to be markets located in countries classified as emerging or frontier markets by MSCI, and are generally located in the AsiaPacific region, Eastern Europe, the Middle East, Central and South America and Africa. There are no geographic limits on the Fund’s non-U.S. investments.
The Fund may invest in companies of any size. The portion of the Fund’s assets invested in small, medium or large companies is expected to vary over time. The Fund will target a balanced approach with allocations across the market capitalization spectrum. At times the Fund may increase the relative emphasis of its investments in a particular region, country, sector, industry or other segment of the market.
The Fund primarily invests in equity securities, including common stocks, preferred stocks, warrants and other rights, and securities convertible into or exchangeable for common stocks. The Fund may also invest in pooled investment vehicles (primarily ETFs); real estate investment trusts (“REITs”); and initial public offerings (“IPOs”). The Fund’s investments may be hedged or unhedged to foreign currencies depending on the market opportunities. Although most of the Fund’s investments must be liquid at the time of investment, the Fund may invest, to some extent, in securities that are restricted or illiquid. The Fund may also invest in depositary receipts, including American, European and Global Depository Receipts.
The Adviser uses a fundamental, bottom up approach to identify what it believes are quality companies, as evidenced by the durability of the company’s business model (strong competitive advantages and high barriers to entry), the company’s financial strength (greater returns on capital, free cash flow generation, healthy balance sheets), the presence of long-term growth, and value-accretive management teams.
From time to time the Fund may invest in companies that are experiencing unusual and possibly unique developments. Potential investments in the stock of these companies are usually the result of companies uncovered in the research process that are otherwise outside of the standard investment criteria employed by the Fund, but may have opportunities for significant returns. These companies are deemed “special situations”. Special situations include companies going through reorganizations, recapitalizations, mergers, spin-offs, or facing resolutions of litigation, management team changes, or important technological improvements or discoveries.
The Fund will buy such quality companies when the Adviser believes their fundamentals are mispriced relative to their long-term potential and when their stock prices reflect reasonable valuations. The Fund will sell companies when fundamentals deteriorate, thus impairing the long-term quality of the business; when the market price exceeds the Adviser’s estimate of intrinsic value; when the Adviser’s investment thesis supporting its decision to purchase and hold the company is no longer valid; and/or when the Adviser believes a more attractive risk/reward opportunity exists.
Risk [Heading] rr_RiskHeading PRINCIPAL RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
As with any mutual fund, there is no guarantee that the Fund will achieve its objective. The Fund’s share price fluctuates, which means you could lose money by investing in the Fund. The Fund is not a complete investment program and should be considered only as part of an investment portfolio. The principal risks of investing in the Fund are summarized below:
•
Market Risk — This is the risk that the price of a security will fall due to changing economic, political or market conditions, or due to a company’s individual situation. The risk would be greater if any of the categories of securities that the Fund emphasizes fell out of favor with the market. Companies in the Fund’s portfolio could fail to achieve earnings estimates or other market expectations, causing their stock prices to drop.
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Foreign Investing Risk — Foreign securities may underperform U.S. securities and may be more volatile than U.S. securities. Risks relating to investments in foreign securities (including, but not limited to, depositary receipts and participation certificates) and to securities of issuers with significant exposure to foreign markets include currency exchange rate fluctuation; less available public information about the issuers of securities; less stringent regulatory standards; lack of uniform accounting, auditing and financial reporting standards; imposition of foreign withholding and other taxes; country risks, including less liquidity, high inflation rates and unfavorable economic practices; and political instability and expropriation and nationalization risks.
•
Emerging Markets Risk — Investment risks typically are greater in emerging and less developed markets. For example, in addition to the risks associated with investments in any foreign country, political, legal and economic structures in these less developed countries may be new and changing rapidly, which may cause instability and greater risk of loss. Their securities markets may be less developed, and securities in those markets are generally more volatile and less liquid than those in the developed markets. Investing in emerging market countries may involve substantial risk due to, among other reasons, limited information; higher brokerage costs; different accounting, auditing and financial reporting standards; less developed legal systems and thinner trading markets as compared to those in developed countries; different clearing and settlement procedures and custodial services; and currency blockages or transfer restrictions. Emerging market countries also are more likely to experience high levels of inflation, deflation or currency devaluations, which could hurt their economies and securities markets. Certain emerging markets also may face other significant internal or external risks, including a heightened risk of war or ethnic, religious or racial conflicts. In addition, governments in many emerging market countries participate to a significant degree in their economies and securities markets, which may impair investment and economic growth of companies in those markets. Such markets may also be heavily reliant on foreign capital and, therefore, vulnerable to capital flight.
•
Currency Risk — Foreign securities usually are denominated and traded in foreign currencies and the exchange rates between foreign currencies and the U.S. dollar fluctuate continuously. The Fund’s performance will be affected by its direct or indirect exposure, which may include exposure through U.S. dollar denominated depositary receipts and participation certificates, to a particular currency due to favorable or unfavorable changes in currency exchange rates relative to the U.S. dollar. The Fund’s direct or indirect exposure to a particular currency may be hedged to mitigate currency volatility or because the Fund believes a currency is overvalued. There can be no guarantee that any hedging activity will be successful. Hedging activity and/or use of forward foreign currency contracts may reduce or limit the opportunity for gain and involves counterparty risk, which is the risk that the contracting party will not fulfill its contractual obligation to deliver the currency contracted for at the agreed upon price to the Fund.
•
Equity Securities Risk — The risk that the market price of common stocks and other equity securities, including preferred stocks, warrants and rights, may go up or down, sometimes rapidly or unpredictably, including due to factors affecting equity securities markets generally, particular industries represented in those markets, or the issuer itself.
•
Pooled Investment Vehicle Risk — The Fund will indirectly bear its proportionate share of any fees and expenses payable directly by any other pooled investment vehicle in which the Fund invests (primarily ETFs). Therefore, the Fund will incur higher expenses, some of which could be considered duplicative. In addition, the Fund may be affected by losses of the underlying investment vehicle and the level of risk arising from the investment practices of the underlying investment vehicle (such as the use of leverage). The Fund has no control over the risks taken by the underlying investment vehicle in which it invests.
•
REIT Risk — The Fund’s investments in real estate related securities (primarily REITs) are subject to the risk that the value of the real estate underlying the securities will go down, which can be caused by deteriorating economic conditions and rising interest rates, and may also be subject to the risk that borrowers or tenants may default on their payment obligations. Investments in REITs involve additional risks. REITs may have limited financial resources and real estate diversification and are dependent on specialized management skills. In addition, the failure of a REIT to qualify as a REIT for federal income tax purposes would adversely affect the REIT’s value.
•
Depositary Receipts Risk — The Fund’s investments in depositary receipts include American Depositary Receipts (“ADRs”), Global Depositary Receipts (“GDRs”) and European Depositary Receipts (“EDRs”). ADRs are receipts issued by U.S. banks evidencing ownership in securities of foreign issuers, and GDRs and EDRs are receipts issued by banks in more than one country evidencing ownership in securities of foreign issuers. Although depositary receipts have risks similar to the foreign securities that they represent, they may also involve higher expenses and may trade at a discount (or premium) to the underlying security. In addition, depositary receipts may not pass through voting and other shareholder rights, and may be less liquid than the underlying securities listed on an exchange.
•
IPO Risk —The prices of securities purchased in IPOs tend to fluctuate more widely than securities of companies that have been publicly traded for a longer period of time. Securities purchased in IPOs generally do not have a trading history, and information about the issuers of such securities may be available for very limited periods. At any particular time or from time to time a Fund may not be able to invest in securities issued in IPOs, or invest to the extent desired because, for example, only a small portion (if any) of the securities being offered in an IPO may be made available to the Fund. In addition, under certain market conditions a relatively small number of companies may issue securities in IPOs. There can be no assurance that investments in IPOs will be available to the Fund or improve the Fund’s performance.
•
Management Risk — The Fund is subject to management risk because it is an actively managed investment portfolio. The Adviser will apply its investment techniques and risk analyses in making investment decisions for the Fund, but there is no guarantee that its decisions will produce the intended result. The Fund’s management strategy or security selection methods could prove less successful than anticipated or unsuccessful. This risk is common for all actively managed funds.
•
Large-Capitalization Companies Risk — Larger, more established companies may be unable to respond quickly to new competitive challenges, such as changes in consumer tastes or innovative smaller competitors. Also, large-cap companies are sometimes unable to attain the high growth rates of successful, smaller companies, especially during extended periods of economic expansion.
•
Small- and Mid-Capitalization Companies Risk — The Fund may invest in the securities of companies with small and mid-capitalizations, which can involve greater risk and the possibility of greater portfolio volatility than investments in securities of large capitalization companies. Historically, securities of small and mid-capitalization companies and recently organized companies have been more volatile in price than those of the larger market capitalization companies. Among the reasons for the greater price volatility is the lower degree of liquidity in the markets for such securities. Small and mid-capitalization companies may have limited product lines and financial resources and may depend upon a limited or less experienced management group. The securities of some small capitalization companies trade in the over-the-counter markets or on regional exchanges and may not be traded daily or in the volume typical of trading on a national securities exchange, which may make these securities more difficult to value and to sell.
•
Micro Capitalization Companies Risk — Micro-cap stocks have a market capitalization of less than $300 million. Micro-cap companies may be less financially secure than large, mid or small capitalization companies. Micro-cap companies may be in the early stage of development or newly formed with limited markets or product lines. There may also be less public information about micro-cap companies. In addition, micro-cap companies that rely on smaller management teams may be vulnerable to key personnel losses. Micro-cap stock prices also may be more volatile than large, mid or small-cap stocks, may have lower trading volume and lower degree of liquidity which makes these securities difficult to value and to sell. The securities of micro-cap companies may not be traded daily. As a result, some of the Fund’s holdings may be considered or become illiquid.
•
Liquidity Risk — Liquidity risk exists when particular investments are difficult to sell, and such investments (particularly investments deemed to be illiquid) may be harder to value. If the Fund sells these investments to meet shareholder redemption requests or for other purposes, the Fund may suffer a loss.
•
Restricted Securities Risk — Restricted securities are privately-placed securities whose resale is restricted under the U.S. securities laws. The Fund may invest in restricted securities, including unregistered securities eligible for resale without registration pursuant to Rule 144A (“Rule 144A Securities”) and privately-placed securities of U.S. and non-U.S. issuers offered outside the U.S. without registration with the U.S. Securities and Exchange Commission pursuant to Regulation S (“Regulation S Securities”) under the 1933 Act. Rule 144A Securities and Regulation S Securities may be freely traded among certain qualified institutional investors, such as the Fund, but whose resale in the U.S. is permitted only in limited circumstances. Investing in Rule 144A Securities and Regulation S Securities may increase the illiquidity of the Fund’s investments in the event that an adequate trading market does not exist for these securities.
•
Growth Investing Risk — Growth stocks may fall out of favor with investors and underperform other asset types during given periods. A company may never achieve the earnings growth the Adviser anticipated.
•
Value Investing Risk — Value stocks may not increase in price, may not issue the anticipated stock dividends or may decline in price, based upon the market’s belief of the issuer’s intrinsic worth.
•
Region, Country, Sector or Industry Focus Risk — The prices of securities of issuers in a particular region, country, sector, industry or other segment of the market may be more susceptible to fluctuations due to changes in economic or business conditions, government regulations, availability of basic resources or supplies, or other events that affect that market segment more than securities of issuers in other market segments, and such volatility will cause fluctuations in the Fund’s share price to the extent that the Fund emphasizes its investments in that region, county, sector, industry or other market segment.
•
Special Situations Risk— The Fund will seek to benefit from “special situations,” such as mergers, reorganizations, or other unusual events expected to affect a particular issuer. There is a risk that the “special situation” might not occur or involve longer time frames than originally expected, which could have a negative impact on the price of the issuer’s securities and fail to produce gains or produce a loss for the Fund.
•
Newer Fund Risk — The Fund has a short operating history and may not attract sufficient assets to achieve or maximize investment and operational efficiencies.
Risk Lose Money [Text] rr_RiskLoseMoney The Fund’s share price fluctuates, which means you could lose money by investing in the Fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading PAST PERFORMANCE
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance for its first full year of operation and by showing how the Fund’s average annual total returns for its first full year and since inception compare with those of a broad measure of market performance. Bear in mind that past performance (before and after taxes) is not a guarantee of future performance.
The bar chart shows the annual total returns of the Fund’s Class I shares for its first full year of operation. The table presents the Fund’s average annual total returns for the 1-year and since inception periods. The Fund’s performance figures assume that all distributions were reinvested in the Fund and do not reflect its annual operating expenses. Updated performance information may be obtained on the Fund’s website at www.rmbfunds.com or by calling 1-800-462-2392.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance for its first full year of operation and by showing how the Fund’s average annual total returns for its first full year and since inception compare with those of a broad measure of market performance.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-462-2392
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.rmbfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Bear in mind that past performance (before and after taxes) is not a guarantee of future performance.
Bar Chart [Heading] rr_BarChartHeading RMB International Fund – Return for Class I Shares
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best Quarter: (0.10)% in the 1st Quarter of 2018
Worst Quarter: (18.89)% in the 4th Quarter of 2018
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (For the following periods ended 12/31/2018)
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads The Fund’s performance figures assume that all distributions were reinvested in the Fund and do not reflect its annual operating expenses.
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction of fees, expenses or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements, such as 401(k) plans or IRAs.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher The “Total Return After Taxes on Distributions and Sale of Fund Shares” can be higher than other return figures when a capital loss occurs upon the redemption of Fund shares. If realized losses occur upon the sale of Fund shares, the capital loss is recorded as a tax benefit, which increases the return.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements, such as 401(k) plans or IRAs. The “Total Return After Taxes on Distributions and Sale of Fund Shares” can be higher than other return figures when a capital loss occurs upon the redemption of Fund shares. If realized losses occur upon the sale of Fund shares, the capital loss is recorded as a tax benefit, which increases the return. No returns are provided for Investor Class shares, which have not been offered for sale.
RMB International Fund | MSCI EAFE Index (reflects no deduction of fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel MSCI EAFE Index (reflects no deduction of fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 (13.79%)
Since Inception rr_AverageAnnualReturnSinceInception (13.23%) [14]
RMB International Fund | Investor Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.75%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.41%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.42%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.01%) [15]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.41% [16]
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 5/1/2020
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 144
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 448
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 775
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,701
RMB International Fund | Class I  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.75%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.41%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.17%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.01%) [15]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.16% [16]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 118
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 371
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 643
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,419
Annual Return 2018 rr_AnnualReturn2018 (21.81%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2018
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn (0.10%)
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2018
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (18.89%)
Label rr_AverageAnnualReturnLabel Total Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (21.81%)
Since Inception rr_AverageAnnualReturnSinceInception (21.52%) [14]
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 27, 2017
RMB International Fund | Class I | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Total Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 (21.80%)
Since Inception rr_AverageAnnualReturnSinceInception (21.51%) [14]
RMB International Fund | Class I | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Total Return After Taxes on Distributions and Sale of Fund Shares2
1 Year rr_AverageAnnualReturnYear01 (12.83%) [17]
Since Inception rr_AverageAnnualReturnSinceInception (16.34%) [14],[17]
RMB Japan Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading RMB Japan Fund
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The RMB Japan Fund (the “Fund”) seeks long-term capital appreciation.
There can be no assurance that the Fund will be successful in achieving its investment objective.
Expense [Heading] rr_ExpenseHeading FEES AND EXPENSES OF THE FUND
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
The table below describes the fees and expenses you may pay if you buy and hold shares of the Fund.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading PORTFOLIO TURNOVER
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
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 135% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 135.00%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
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] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund pursues its investment objective by investing, under normal conditions, at least 80% of its net assets (plus any borrowings for investment purposes) in equity securities of Japanese companies.
The Adviser considers a Japanese company to be a company organized under the laws of Japan, for which the principal securities trading market is Japan, or a company that has a majority of its assets or business in Japan.
The Fund primarily invests in equity securities, including common stocks, preferred stocks, warrants and other rights and securities convertible into or exchangeable for common stocks. The Fund’s investments also may include pooled investment vehicles (primarily exchange-traded funds or “ETFs”) that invest in equity securities of Japanese companies; Japanese real estate investment trusts (“REITs”); initial public offerings (“IPOs”); equity-linked securities that provide economic exposure to securities of Japanese companies without direct investment in the underlying securities, including derivative instruments such as swaps, options, futures contracts, forward contracts and foreign currency futures. The Fund’s investments may be hedged or unhedged to foreign currencies depending on the market opportunities. Investments in ETFs that invest principally in equity securities of Japanese companies and investments in derivatives that provide exposure to Japanese companies are considered investments in Japanese companies for purposes of the 80% requirement noted above. The Fund may invest in companies of any size. The portion of the Fund’s assets invested in small, medium or large companies is expected to vary over time. The Fund will target a balanced approach with allocations across the market capitalization spectrum. Although most of the Fund’s investments must be liquid at the time of investment, the Fund may invest, to some extent, in securities that are restricted or illiquid, and these securities will be considered in determining compliance with the Fund’s 80% investment policy noted above. The Fund will limit its investment in all restricted securities, including Rule 144A securities, to 15% of its total assets. Restricted securities, other than Rule 144A securities determined to be liquid, are considered to be illiquid and are subject to the Fund’s separate 15% limitation on investments in illiquid securities. The Fund may also invest in depositary receipts, including American, European and Global Depository Receipts.
The Adviser uses a fundamental, bottom-up research approach. Fundamental analysis includes evaluation of management teams and shareholder structure, and examination of competitive positioning and industry dynamics, including pricing power, stable free cash flow, and barriers to entry.
The Fund will seek to buy companies when the Adviser believes the companies have a sustainable competitive advantage, strong free cash flow and reasonable valuations relative to their long-term potential. The Fund will sell securities when they are no longer trading below their intrinsic value; when the Adviser believes there has been a deterioration in the company’s fundamentals, and/or a change in the company’s business outlook; or when a better use of capital presents itself.
Risk [Heading] rr_RiskHeading PRINCIPAL RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
As with any mutual fund, there is no guarantee that the Fund will achieve its objective. The Fund’s share price fluctuates, which means you could lose money by investing in the Fund. The Fund is not a complete investment program and should be considered only as part of an investment portfolio. The principal risks of investing in the Fund are summarized below:
•
Market Risk — This is the risk that the price of a security will fall due to changing economic, political or market conditions, or due to a company’s individual situation. The risk would be greater if any of the categories of securities that the Fund emphasizes fell out of favor with the market. Companies in the Fund’s portfolio could fail to achieve earnings estimates or other market expectations, causing their stock prices to drop.
•
Foreign Investing Risk — Foreign securities may underperform U.S. securities and may be more volatile than U.S. securities. Risks relating to investments in foreign securities (including, but not limited to, depositary receipts and participation certificates) and to securities of issuers with significant exposure to foreign markets include currency exchange rate fluctuation; less available public information about the issuers of securities; less stringent regulatory standards; lack of uniform accounting, auditing and financial reporting standards; imposition of foreign withholding and other taxes; country risks, including less liquidity, high inflation rates and unfavorable economic practices; and political instability and expropriation and nationalization risks.
•
Risks of Investing in Asia — The value of the Fund’s assets may be adversely affected by political, economic, social and religious instability; inadequate investor protection; changes in laws or regulations of countries within the Asian region (including countries in which the Fund invests, as well as the broader region); international relations with other nations; natural disasters; corruption and military activity. The Asian region, and particularly China, Japan and South Korea, may be adversely affected by political, military, economic and other factors related to North Korea.
•
Risks Associated with Japan — The Japanese economy continues to emerge from a prolonged economic downturn. Since the year 2000, Japan’s economic growth rate has remained relatively low. The economy is characterized by an aging demographic, declining population, large government debt and highly regulated labor market. Economic growth is dependent on domestic consumption, deregulation and consistent government policy. International trade, particularly with the U.S., also impacts growth and adverse economic conditions in the U.S. or other such trade partners may affect Japan. Japan also has a growing economic relationship with China and other Southeast Asian countries, and thus Japan’s economy may also be affected by economic, political, or social instability in those countries (whether resulting from local or global events).
•
Currency Risk — Foreign securities usually are denominated and traded in foreign currencies and the exchange rates between foreign currencies and the U.S. dollar fluctuate continuously. The Fund’s performance will be affected by its direct or indirect exposure, which may include exposure through U.S. dollar denominated depositary receipts and participation certificates, to a particular currency due to favorable or unfavorable changes in currency exchange rates relative to the U.S. dollar. The Fund’s direct or indirect exposure to a particular currency may be hedged to mitigate currency volatility or because the Fund believes a currency is overvalued. There can be no guarantee that any hedging activity will be successful. Hedging activity and/or use of forward foreign currency contracts may reduce or limit the opportunity for gain and involves counterparty risk, which is the risk that the contracting party will not fulfill its contractual obligation to deliver the currency contracted for at the agreed upon price to the Fund.
•
Equity Securities Risk — The risk that the market price of common stocks and other equity securities, including preferred stocks, warrants and rights, may go up or down, sometimes rapidly or unpredictably, including due to factors affecting equity securities markets generally, particular industries represented in those markets, or the issuer itself.
•
Pooled Investment Vehicle Risk — The Fund will indirectly bear its proportionate share of any fees and expenses payable directly by any other pooled investment vehicle in which the Fund invests (primarily ETFs). Therefore, the Fund will incur higher expenses, some of which could be considered duplicative. In addition, the Fund may be affected by losses of the underlying investment vehicle and the level of risk arising from the investment practices of the underlying investment vehicle (such as the use of leverage). The Fund has no control over the risks taken by the underlying investment vehicle in which it invests.
•
Derivatives Risk – The use of derivatives presents risks different from, and possibly greater than, the risks associated with investing directly in traditional securities as well as increased transaction costs. The use of derivatives can lead to losses because of adverse movements in the price or value of the underlying asset, reference rate or index. Derivative strategies often involve leverage, which may increase a loss, potentially causing the Fund to lose more money than it would have lost had it invested in the underlying security. Also, a liquid market may not always exist for the Fund’s derivative positions at times when the Fund might wish to terminate or sell such positions.
•
Leverage Risk – To the extent the Fund’s use of derivatives creates leverage, the value of the Fund’s shares may be more volatile because leverage will amplify the effect of increases or decreases in the value of the Fund’s derivative investments.
•
REIT Risk — The Fund’s investments in real estate related securities (primarily REITs) are subject to the risk that the value of the real estate underlying the securities will go down, which can be caused by deteriorating economic conditions and rising interest rates, and may also be subject to the risk that borrowers or tenants may default on their payment obligations. Investments in REITs involve additional risks. REITs may have limited financial resources and real estate diversification and are dependent on specialized management skills. In addition, the failure of a REIT to qualify as a REIT for federal income tax purposes would adversely affect the REIT’s value.
•
Depositary Receipts Risk — The Fund’s investments in depositary receipts include American Depositary Receipts (“ADRs”), Global Depositary Receipts (“GDRs”) and European Depositary Receipts (“EDRs”). ADRs are receipts issued by U.S. banks evidencing ownership in securities of foreign issuers, and GDRs and EDRs are receipts issued by banks in more than one country evidencing ownership in securities of foreign issuers. Although depositary receipts have risks similar to the foreign securities that they represent, they may also involve higher expenses and may trade at a discount (or premium) to the underlying security. In addition, depositary receipts may not pass through voting and other shareholder rights, and may be less liquid than the underlying securities listed on an exchange.
•
IPO Risk — The prices of securities purchased in IPOs tend to fluctuate more widely than securities of companies that have been publicly traded for a longer period of time. Securities purchased in IPOs generally do not have a trading history, and information about the issuers of such securities may be available for very limited periods. At any particular time or from time to time a Fund may not be able to invest in securities issued in IPOs, or invest to the extent desired because, for example, only a small portion (if any) of the securities being offered in an IPO may be made available to the Fund. In addition, under certain market conditions a relatively small number of companies may issue securities in IPOs. There can be no assurance that investments in IPOs will be available to the Fund or improve the Fund’s performance.
•
Management Risk — The Fund is subject to management risk because it is an actively managed investment portfolio. The Adviser will apply its investment techniques and risk analyses in making investment decisions for the Fund, but there is no guarantee that its decisions will produce the intended result. The Fund’s management strategy or security selection methods could prove less successful than anticipated or unsuccessful. This risk is common for all actively managed funds.
•
Large-Capitalization Companies Risk — Larger, more established companies may be unable to respond quickly to new competitive challenges, such as changes in consumer tastes or innovative smaller competitors. Also, large-cap companies are sometimes unable to attain the high growth rates of successful, smaller companies, especially during extended periods of economic expansion.
•
Small- and Mid-Capitalization Companies Risk — Historically, securities of small and mid-capitalization companies and recently organized companies have been more volatile in price than those of the larger market capitalization companies. Among the reasons for the greater price volatility is the lower degree of liquidity in the markets for such securities, which may make these securities difficult to value and to sell. As a result, some of the Fund’s small cap holdings may be considered or become illiquid. Such companies also may have limited product lines and financial resources and may depend upon a limited or less experienced management group.
•
Micro Capitalization Companies Risk — Securities of micro-cap companies have a market capitalization of less than $300 million. Micro-cap companies may be less financially secure than large, mid or small-capitalization companies. Micro-cap companies may be in the early stage of development or newly formed with limited markets or product lines. There may also be less public information about micro-cap companies. In addition, micro-cap companies that rely on smaller management teams may be vulnerable to key personnel losses. Micro-cap stock prices also may be more volatile than large, mid or small-cap stocks, may have lower trading volume and lower degree of liquidity which makes these securities difficult to value and to sell. The securities of micro-cap companies may not be traded daily. As a result, some of the Fund’s holdings may be considered or become illiquid.
•
Liquidity Risk — Liquidity risk exists when particular investments are difficult to sell, and such investments (particularly investments deemed to be illiquid) may be harder to value. If the Fund sells these investments to meet shareholder redemption requests or for other purposes, the Fund may suffer a loss.
•
Restricted Securities Risk — Restricted securities are privately-placed securities whose resale is restricted under the U.S. securities laws. The Fund may invest in restricted securities, including unregistered securities eligible for resale without registration pursuant to Rule 144A (“Rule 144A Securities”) and privately-placed securities of U.S. and non-U.S. issuers offered outside the U.S. without registration with the U.S. Securities and Exchange Commission pursuant to Regulation S (“Regulation S Securities”) under the 1933 Act. Rule 144A Securities and Regulation S Securities may be freely traded among certain qualified institutional investors, such as the Fund, but whose resale in the U.S. is permitted only in limited circumstances. Investing in Rule 144A Securities and Regulation S Securities may increase the illiquidity of the Fund’s investments in the event that an adequate trading market does not exist for these securities.
Value Investing Risk — Value stocks may not increase in price, may not issue the anticipated stock dividends or may decline in price, based upon the market’s belief of the issuer’s intrinsic worth.
Newer Fund Risk — The Fund has a short operating history and may not attract sufficient assets to achieve or maximize investment and operational efficiencies.
Risk Lose Money [Text] rr_RiskLoseMoney The Fund’s share price fluctuates, which means you could lose money by investing in the Fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading PAST PERFORMANCE
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance for its first full year of operation and by showing how the Fund’s average annual total returns for its first full year and since inception compare with those of a broad measure of market performance. Bear in mind that past performance (before and after taxes) is not a guarantee of future performance.
The bar chart shows the annual total returns of the Fund’s Class I shares for its first full year of operation. The table presents the Fund’s average annual total returns for the 1-year and since inception periods. The Fund’s performance figures assume that all distributions were reinvested in the Fund and do not reflect its annual operating expenses. Updated performance information may be obtained on the Fund’s website at www.rmbfunds.com or by calling 1-800-462-2392.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance for its first full year of operation and by showing how the Fund’s average annual total returns for its first full year and since inception compare with those of a broad measure of market performance.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-462-2392.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.rmbfunds.com or by calling
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Bear in mind that past performance (before and after taxes) is not a guarantee of future performance.
Bar Chart [Heading] rr_BarChartHeading RMB Japan Fund – Return for Class I Shares
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best Quarter: 3.91% in the 3rd Quarter of 2018
Worst Quarter: (14.76)% in the 4th Quarter of 2018
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (For the following periods ended 12/31/2018)
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads The Fund’s performance figures assume that all distributions were reinvested in the Fund and do not reflect its annual operating expenses. Updated performance information may be obtained on the Fund’s website at
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction of fees, expenses or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements, such as 401(k) plans or IRAs.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher The “Total Return After Taxes on Distributions and Sale of Fund Shares” can be higher than other return figures when a capital loss occurs upon the redemption of Fund shares. If realized losses occur upon the sale of Fund shares, the capital loss is recorded as a tax benefit, which increases the return.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements, such as 401(k) plans or IRAs. The “Total Return After Taxes on Distributions and Sale of Fund Shares” can be higher than other return figures when a capital loss occurs upon the redemption of Fund shares. If realized losses occur upon the sale of Fund shares, the capital loss is recorded as a tax benefit, which increases the return. No returns are provided for Investor Class shares, which have not been offered for sale.
RMB Japan Fund | MSCI Japan Index (reflects no deduction of fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel MSCI Japan Index (reflects no deduction of fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 (12.88%)
Since Inception rr_AverageAnnualReturnSinceInception (12.86%) [18]
RMB Japan Fund | Investor Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.90%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.94% [19]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.10%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.54%) [20]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.56%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 5/1/2020
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 159
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 606
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,079
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,388
RMB Japan Fund | Class I  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.90%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.94% [19]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.85%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.54%) [20]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.31%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 5/1/2020
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 133
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 529
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 950
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,125
Annual Return 2018 rr_AnnualReturn2018 (13.57%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2018
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 3.91%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2018
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (14.76%)
Label rr_AverageAnnualReturnLabel Total Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (13.57%)
Since Inception rr_AverageAnnualReturnSinceInception (13.77%) [18]
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 27, 2017
RMB Japan Fund | Class I | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Total Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 (13.56%)
Since Inception rr_AverageAnnualReturnSinceInception (13.77%) [18]
RMB Japan Fund | Class I | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Total Return After Taxes on Distributions and Sale of Fund Shares2
1 Year rr_AverageAnnualReturnYear01 (7.90%) [21]
Since Inception rr_AverageAnnualReturnSinceInception (10.41%) [18],[21]
[1] The “Total Return After Taxes on Distributions and Sale of Fund Shares” can be higher than other return figures when a capital loss occurs upon the redemption of Fund shares. If realized losses occur upon the sale of Fund shares, the capital loss is recorded as a tax benefit, which increases the return.
[2] Class I shares commenced investment operations on February 1, 2017. Performance shown prior to February 1, 2017 for the Class I shares reflects the performance of Class A shares. Class I shares are not subject to the front-end sales charge or distribution and shareholder service (12b-1) fees applicable to Class A shares, which reduce the performance shown for the Class I shares.
[3] Total Return After Taxes on Distributions and Sale of Fund Shares” can be higher than other return figures when a capital loss occurs upon the redemption of Fund shares. If realized losses occur upon the sale of Fund shares, the capital loss is recorded as a tax benefit, which increases the return.
[4] Class I shares commenced investment operations on February 1, 2017. Performance shown prior to February 1, 2017 for the Class I shares reflects the performance of Class A shares. Class I shares are not subject to the front-end sales charge or distribution and shareholder service (12b-1) fees applicable to Class A shares, which reduce the performance shown for the Class I shares.
[5] The Fund pays a management fee consisting of a basic annual fee of 0.90% of the Fund’s average daily net assets and a performance adjustment based on a rolling 36-month period, resulting in a minimum fee of 0.80% and a maximum fee of 1.00%. The basic annual fee may adjust up or down according to the Fund’s performance relative to its benchmark, the KBW Bank Index. For more information, see the section entitled “The Investment Adviser.”
[6] Short sale dividend and interest expenses result from the use of prime brokerage to execute short sales and are treated as a Fund expense although no cash is received or paid by the Fund. These expenses will vary from the amount shown based on the Funds’ use of short sales.
[7] The Total Annual Fund Operating Expenses do not correlate to the Ratio of Expenses to Average Net Assets after Fees waived provided in the Financial Highlights section of the Fund’s audited financial statements for the period ended December 31, 2018, which reflects the operating expenses of the Fund and does not include Acquired Fund Fees and Expenses.
[8] The “Total Return After Taxes on Distributions and Sale of Fund Shares” can be higher than other return figures when a capital loss occurs upon the redemption of Fund shares. If realized losses occur upon the sale of Fund shares, the capital loss is recorded as a tax benefit, which increases the return.
[9] Class I shares commenced investment operations on August 19, 2015. Performance shown prior to August 19, 2015 for the Class I shares reflects the performance of Class A shares. Class I shares are not subject to the front-end sales charge or distribution and shareholder service (12b-1) fees applicable to Class A shares, which reduce the performance shown for the Class I shares.
[10] Class I shares commenced investment operations on December 27, 2017.
[11] RMB Capital Management, LLC (the “Adviser” or “RMB”) has contractually agreed to reduce its compensation due from and/or assume expenses of the Fund to the extent necessary to ensure that the Fund’s operating expenses (excluding interest, taxes, brokerage commissions and other transaction costs, expenditures that are capitalized in accordance with generally accepted accounting principles, acquired fund fees and expenses, short sale dividends and extraordinary expenses not incurred in the ordinary course of business) do not exceed 1.50% and 1.25% of the average daily net assets of the Fund’s Investor Class and Class I shares, respectively (the “Expense Cap”). The Expense Cap is in effect until May 1, 2020 and cannot be terminated prior thereto without the approval of the Fund’s Board of Trustees. To the extent the Adviser waives its compensation and/or absorbs expenses to satisfy the Expense Cap, it may seek repayment by the Fund of a portion or all of such amounts at any time within three years after the date on which such amounts were waived or absorbed, subject to the expense caps in effect as of the date (i) such amounts were waived or absorbed and (ii) of the repayment.
[12] The Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement do not correlate to the Ratio of Expenses to Average Net Assets after Fees waived provided in the Financial Highlights section of the Fund’s audited financial statements for the period ended December 31, 2018, which reflects the operating expenses of the Fund and does not include Acquired Fund Fees and Expenses.
[13] The “Total Return After Taxes on Distributions and Sale of Fund Shares” can be higher than other return figures when a capital loss occurs upon the redemption of Fund shares. If realized losses occur upon the sale of Fund shares, the capital loss is recorded as a tax benefit, which increases the return.
[14] Class I shares commenced investment operations on December 27, 2017.
[15] RMB Capital Management, LLC (the “Adviser” or “RMB”) has contractually agreed to reduce its compensation due from and/or assume expenses of the Fund to the extent necessary to ensure that the Fund’s operating expenses (excluding interest, taxes, brokerage commissions and other transaction costs, expenditures that are capitalized in accordance with generally accepted accounting principles, acquired fund fees and expenses, short sale dividends and extraordinary expenses not incurred in the ordinary course of business) do not exceed 1.40% and 1.15% of the average daily net assets of the Fund’s Investor Class and Class I shares, respectively (the “Expense Cap”). The Expense Cap is in effect until May 1, 2020 and cannot be terminated prior thereto without the approval of the Fund’s Board of Trustees. To the extent the Adviser waives its compensation and/or absorbs expenses to satisfy the Expense Cap, it may seek repayment by the Fund of a portion or all of such amounts at any time within three years after the date on which such amounts were waived or absorbed, subject to the expense caps in effect as of the date (i) such amounts were waived or absorbed and (ii) of the repayment.
[16] The Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement do not correlate to the Ratio of Expenses to Average Net Assets after Fees waived provided in the Financial Highlights section of the Fund’s audited financial statements for the period ended December 31, 2018, which reflects the operating expenses of the Fund and does not include Acquired Fund Fees and Expenses.
[17] The “Total Return After Taxes on Distributions and Sale of Fund Shares” can be higher than other return figures when a capital loss occurs upon the redemption of Fund shares. If realized losses occur upon the sale of Fund shares, the capital loss is recorded as a tax benefit, which increases the return.
[18] Class I shares commenced investment operations on December 27, 2017.
[19] “Other Expenses” are estimated for the current fiscal year.
[20] RMB Capital Management, LLC (the “Adviser” or “RMB”) has contractually agreed to reduce its compensation due from and/or assume expenses of the Fund to the extent necessary to ensure that the Fund’s operating expenses (excluding interest, taxes, brokerage commissions and other transaction costs, expenditures that are capitalized in accordance with generally accepted accounting principles, acquired fund fees and expenses, short sale dividends and extraordinary expenses not incurred in the ordinary course of business) do not exceed 1.55% and 1.30% of the average daily net assets of the Fund’s Investor Class and Class I shares, respectively (the “Expense Cap”). The Expense Cap is in effect until May 1, 2020 and cannot be terminated prior thereto without the approval of the Fund’s Board of Trustees. To the extent the Adviser waives its compensation and/or absorbs expenses to satisfy the Expense Cap, it may seek repayment by the Fund of a portion or all of such amounts at any time within three years after the date on which such amounts were waived or absorbed, subject to the expense caps in effect as of the date (i) such amounts were waived or absorbed and (ii) of the repayment.
[21] The “Total Return After Taxes on Distributions and Sale of Fund Shares” can be higher than other return figures when a capital loss occurs upon the redemption of Fund shares. If realized losses occur upon the sale of Fund shares, the capital loss is recorded as a tax benefit, which increases the return