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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Central Index Key dei_EntityCentralIndexKey 0001342947
BBH Intermediate Municipal Bond Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading BBH INTERMEDIATE MUNICIPAL BOND FUND SUMMARY
Investment Objective, Heading rr_ObjectiveHeading INVESTMENT OBJECTIVE
Investment Objective, Primary rr_ObjectivePrimaryTextBlock

The investment objective of the BBH Intermediate Municipal Bond Fund (the “Fund”) is to protect investor's capital and generate attractive risk-adjusted returns.

Expense, Heading rr_ExpenseHeading FEES AND EXPENSES OF THE FUND
Expense, Narrative rr_ExpenseNarrativeTextBlock

The table below describes the fees and expenses that you may pay if you buy, hold, and sell the Fund’s Class N Shares and Class I Shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and expense example below.

Shareholder Fees, Caption rr_ShareholderFeesCaption Shareholder Fees (Fees paid directly from your investment)
Operating Expenses, Caption 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 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 above, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 0.45% of the average value of its portfolio. Excluding variable rate demand notes, during the Fund's most recent fiscal year, the Fund's portfolio turnover rate was 0.23% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 0.23%
Expense Example, Heading rr_ExpenseExampleHeading EXAMPLE
Expense Example, Narrative rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the Fund’s Class N Shares and Class I Shares to the cost of investing in other mutual funds. This example gives effect to Class N Shares Expense Limitation Agreement for 1 year and the first year of the 3, 5 and 10-year calculations. The example assumes that you invest $10,000 in the Fund’s Class N Shares and Class I Shares 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 operating expenses of the Fund’s Class N Shares and Class I Shares remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Investment Strategy, Heading rr_StrategyHeading PRINCIPAL INVESTMENT STRATEGIES
Investment Strategy, Narrative rr_StrategyNarrativeTextBlock

The Fund seeks to achieve its investment objective by applying bottom-up fundamental analysis and investing in a long-term, tax-aware manner. The Fund aims to implement the strategy by investing primarily in a diversified portfolio of investment grade municipal bonds rated in the four highest credit ratings categories (AAA to BBB, or equivalent) at the time of purchase by at least one nationally recognized credit rating agency, or, if unrated, deemed to be of comparable quality by the investment adviser. Under normal circumstances, the Fund will invest at least 80% of its net assets, plus any borrowings for investment purposes, in municipal bonds that pay interest that is generally excludable from gross income for federal income tax purposes (except that the interest paid by certain municipal securities may be includable in taxable income for purposes of the federal alternative minimum tax). There can be no assurance that the Fund will achieve its investment objective.

The Fund may invest in fixed-, variable- or floating-rate municipal securities issued by states, territories and possessions of the United States and the District of Columbia and their political subdivisions, agencies, and instrumentalities, authorities thereof, and multi-state agencies, issued to obtain funds for various public purposes. These may include general obligation bonds, which typically are backed by the issuer’s ability to levy taxes, and revenue bonds, which typically are backed by a stream of revenue from a particular facility or class of facilities or, in some cases, from the proceeds of a special excise or other specific revenue source. Municipal securities also include auction rate municipal

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securities. The Fund may invest up to 15% of the market value of its total assets in securities that may be purchased on a when-issued or delayed delivery basis.

The Fund may also invest up to 20% of its total assets in securities that are not municipal securities, if, in the opinion of the Investment Adviser, these securities will enhance after-tax returns for Fund investors. Non-municipal securities investments may include notes and bonds issued by domestic and foreign corporations and financial institutions and the U.S. Government, its agencies and guaranteed issuers. In addition, the Fund may purchase asset-backed securities, mortgage backed securities, auction rate securities and other sovereign debt when the Investment Adviser believes that the additional returns from these securities justify the risk of allocations to these asset classes. Under normal circumstances, the Fund expects the portfolio’s dollar weighted average maturity to be between 3 and 10 years.

The Fund may invest in money market instruments, repurchase agreements and derivative instruments, including futures, swaps and options, to hedge its investments or to seek to enhance returns.

The Fund will not invest 25% or more of total assets in municipal obligations relating to similar types of projects or with other similar economic, business, or political characteristics (such as bonds of airport facilities or healthcare providers). For purposes of this policy, securities of the U.S. Government, its agencies, or instrumentalities and municipal obligations backed by the credit of governmental entities are not subject to this 25% limit. The Fund may invest more than 25% of its total assets in municipal securities whose issuers are located in any one state.

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As part of the Fund’s investment process, the Investment Adviser considers environmental, social and governance (“ESG”) factors for each investment in the portfolio. ESG factors include, but are not limited to the environmental and social impact of the issuer, as well as the issuers instituted governance programs.

Strategy Portfolio Concentration rr_StrategyPortfolioConcentration The Fund seeks to achieve its investment objective by applying bottom-up fundamental analysis and investing in a long-term, tax-aware manner. The Fund aims to implement the strategy by investing primarily in a diversified portfolio of investment grade municipal bonds rated in the four highest credit ratings categories (AAA to BBB, or equivalent) at the time of purchase by at least one nationally recognized credit rating agency, or, if unrated, deemed to be of comparable quality by the investment adviser. Under normal circumstances, the Fund will invest at least 80% of its net assets, plus any borrowings for investment purposes, in municipal bonds that pay interest that is generally excludable from gross income for federal income tax purposes (except that the interest paid by certain municipal securities may be includable in taxable income for purposes of the federal alternative minimum tax). There can be no assurance that the Fund will achieve its investment objective.
Risk, Heading rr_RiskHeading PRINCIPAL RISKS OF THE FUND
Risk, Narrative rr_RiskNarrativeTextBlock

The principal risks of investing in the Fund and the circumstances reasonably likely to adversely affect an investment are listed and described below. The share price of the Fund changes daily, based on market conditions and other factors. A shareholder may lose money by investing in the Fund. There can be no assurance that the Fund will achieve its investment objective.

Investment Risk:

Investors in the Fund could lose money, including the possible loss of the entire principal amount of an investment, over short or even long periods of time.

Market Risk:

The price of a security may fall due to changing economic, political, regulatory or market conditions, or due to a company’s or issuer’s individual situation. Natural disasters, the spread of infectious illness and other public health emergencies, recession, terrorism and other unforeseeable events may lead to increased market volatility and may have adverse effects on world economies and markets generally.

Interest Rate Risk:

Interest rate risk refers to the price fluctuation of a bond in response to changes in interest rates. The Fund’s investments in bonds and other fixed income securities will change in value in response to fluctuations in interest rates. In general, bonds with shorter maturities are less sensitive to interest rate movements than those with longer maturities (i.e., when interest rates increase,

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bond prices fall). Rising interest rates tend to cause the prices of debt securities (especially those with longer maturities) to fall which could result in a decrease of the net asset value (“NAV”) of the Fund. Changes in the yield curve will impact the Fund’s investments. For example, when transitioning to recession, yields on shorter term securities tend to fall faster than the yields on longer term securities. When transitioning to expansion, yields on longer term bonds tend to rise less quickly that yields on shorter term securities. The Fund may invest in variable and floating rate securities. Although these instruments are generally less sensitive to interest rate changes than fixed rate instruments, the value of variable and floating rate securities may decline if their interest rates do not rise as quickly, or as much, as general interest rates. The Fund’s fixed income investments may be subject to heightened risk associated with rising interest rates given the current historically low interest rate environment.

A potential increase in interest rates may also result in periods of volatility and increased redemptions. As a result of increased redemptions, the Fund may have to liquidate fixed income securities at disadvantageous prices and times, or at a loss, which could adversely affect the performance of the Fund. While the Fund may use futures contracts, swaps and futures options to hedge against anticipated changes in interest rates, there can be no guarantee that the Fund will be able to successfully hedge interest rate exposures.

Illiquid Investment Risk:

Illiquid investment risk exists when a particular instrument is difficult to purchase or sell. Size of a transaction or illiquid markets may be factors.

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Credit Risk:

Credit risk refers to the likelihood that an issuer, guarantor, or the counterparty to a derivative contract or repurchase agreement, will default on interest or principal payments. In addition to the possibility of an issuer being in default, the issuer may request an extension on the maturity of a security. In instances in which the maturity of a security is extended, the value of the security may decline.

Municipal Issuer Risk:

The Fund invests principally in municipal securities. The value of municipal securities may be affected by uncertainties in the municipal market related to legislation or litigation involving the taxation of municipal securities or the rights of municipal securities holders in the event of a default or bankruptcy. If a security’s structure fails to function as intended, the security could become taxable or decline in value. Additionally, issuers of municipal obligations may not be able to make timely payments because of general economic downturns or increased governmental costs.

Municipal Revenue Sector Risk:

The Fund will not invest 25% or more of its total assets in any one municipal revenue sector relating to bonds backed by revenues from similar types of projects (such as those relating to higher education, healthcare, housing, airports or utilities) or with other similar economic, business, or political characteristics. However, as the Fund’s exposure to such similar projects increases, the Fund will also become more sensitive to adverse economic, business or political developments relevant to these projects.

Geographic Risk:

From time to time the Fund may have a significant position in municipal securities whose issuers are located in a particular state. Under these circumstances, changes in the economic conditions in that state are likely to affect the Fund’s investments and performance.

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Taxation Risk:

The Internal Revenue Service (“IRS”) has announced that holders of tax-exempt bonds such as the Fund have certain risks if the bonds were issued in connection with abusive transactions, refinancing irregularities, or the misuse of proceeds from the bond offering. While the Fund endeavors to purchase only bona fide tax-exempt bonds, there is a risk that a bond may be reclassified by the IRS as a taxable bond creating taxable income for the Fund and its shareholders. In this case, the Fund might be required to send to you and file with the IRS information returns for prior calendar years reclassifying some of its exempt-interest dividends as taxable dividends.

To qualify to pay exempt-interest dividends, which are treated as items of interest excludable from gross income for federal income tax purposes, at least 50% of the value of the total assets of the Fund must consist of obligations exempt from regular income tax as of the close of each quarter of the Fund’s taxable year. If the proportion of taxable investments held by the Fund exceeds 50% of the Fund’s total assets as of the close of any quarter of any Fund taxable year, the Fund will not for that taxable year satisfy the general eligibility test that otherwise permits it to pay exempt-interest dividends. Additionally, the Fund is generally not a suitable investment for individual retirement accounts, for other tax-exempt or tax-deferred accounts or for investors who are not sensitive to the federal income tax consequences of their investments.

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When-Issued and Delayed Delivery Securities Risk:

The fund will not invest more than 15% of the market value of its total assets, less liabilities other than the obligations created by when-issued or delayed delivery commitments, in securities that have an extended settlement, including when-issued and delayed delivery securities. Between the transaction date and the delivery date, the price of the securities is subject to market fluctuations and may rise or fall depending on market conditions, additionally no interest will accrue until the securities are delivered. If a fund remains substantially fully invested at a time when a purchase is outstanding, the purchases may result in a form of leverage. If the counterparty to a when-issued or delayed-delivery transaction fails to deliver the securities, the fund may receive a less favorable price or yield, or may suffer a loss.

Large Shareholder Risk:

Asset allocation decisions, particularly large redemptions, made by an investment adviser whose discretionary clients make up a large percentage of the Fund’s shareholders may adversely impact remaining Fund shareholders.

Management Risk:

The Fund is actively managed and its success depends upon the investment skills and analytical abilities of the Investment Adviser to develop and effectively implement strategies that achieve the Fund’s investment objective. Subjective decisions made by the Investment Adviser may cause the Fund to incur losses or to miss profit opportunities on which it may otherwise have capitalized.

Call Risk:

If the securities in which the Fund invests are redeemed by the issuer before maturity the Fund may have to reinvest the proceeds in securities that pay a lower interest rate, which may decrease the Fund’s yield. This will most likely happen when interest rates are declining.

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Derivatives Risk:

Derivatives are financial contracts whose value depends on, or is derived from, the value of an underlying asset or index. Risks are different from, or possibly greater than, the risks associated with investing directly in securities and other traditional investments. Risks include illiquid investment risk, interest rate risk, market risk, credit risk, risk of mis-pricing or improper valuation and the risk of miscorrelation. The Fund could lose more than the principal amount invested.

Risk, Lose Money rr_RiskLoseMoney A shareholder may lose money by investing in the Fund.
Bar Chart and Performance Table, Heading rr_BarChartAndPerformanceTableHeading FUND PERFORMANCE
Performance, Narrative rr_PerformanceNarrativeTextBlock

The following bar chart and table are designed to give an indication of the risks involved with an investment in the Fund. The bar chart shows changes in the performance of the Fund’s Class N Shares from year to year. The table shows how the average annual returns of the Fund’s Class N Shares and Class I Shares for the periods indicated compared to a broad-based market index. One cannot invest directly in an index.

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When you consider this information, please remember that the Fund's performance (before and after taxes) in past years is not necessarily an indication of how the Fund will perform in the future. Updated information on the Fund's performance can be obtained by visiting www.bbhfunds.com or can be obtained by phone at 1-800-575-1265.

Performance, Information Illustrates Variability of Returns rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart and table are designed to give an indication of the risks involved with an investment in the Fund. The bar chart shows changes in the performance of the Fund’s Class N Shares from year to year. The table shows how the average annual returns of the Fund’s Class N Shares and Class I Shares for the periods indicated compared to a broad-based market index.
Performance Availability Phone rr_PerformanceAvailabilityPhone 1-800-575-1265
Performance Availability Website Address rr_PerformanceAvailabilityWebSiteAddress www.bbhfunds.com
Performance Past Does Not Indicate Future rr_PerformancePastDoesNotIndicateFuture When you consider this information, please remember that the Fund's performance (before and after taxes) in past years is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Return for Class N Shares (% Per Calendar Year)
Bar Chart, Closing rr_BarChartClosingTextBlock

Highest Performing Quarter:

 

2.61% in 2nd quarter of 2020

Lowest Performing Quarter:

 

(2.87)% in 4th quarter of 2016

Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Performing Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 2.61%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Performing Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2016
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (2.87%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns(For the periods ended December 31, 2021)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate The Fund's performance figures assume that all distributions were reinvested in the Fund. 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-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for only one class and after-tax returns for other classes will vary.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock

The Fund's performance figures assume that all distributions were reinvested in the Fund. 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-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for only one class and after-tax returns for other classes will vary.

BBH Intermediate Municipal Bond Fund | Barclays Capital Municipal Bond 1-15 Year Blend Index (reflects no deduction of fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Index No Deduction for Fees, Expenses, Taxes rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction of fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 0.86%
5 Years rr_AverageAnnualReturnYear05 3.57%
Since Inception rr_AverageAnnualReturnSinceInception 3.19%
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 01, 2014
BBH Intermediate Municipal Bond Fund | Class N Shares  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum Sales Charge (Load) Imposed on Reinvested Dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee on shares held less than 30 days after purchase (as a percentage of amount redeemed, if applicable) rr_RedemptionFeeOverRedemption 1.00%
Exchange Fee rr_ExchangeFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.40%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.09%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.69%
Less Fee Waiver/Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.04%) [1]
Total Annual Fund Operating Expenses After Fee Waiver/Expense Reimbursement rr_NetExpensesOverAssets 0.65%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination March 1, 2023
1 Year rr_ExpenseExampleYear01 $ 66
3 Years rr_ExpenseExampleYear03 217
5 Years rr_ExpenseExampleYear05 380
10 Years rr_ExpenseExampleYear10 $ 855
Annual Return 2015 rr_AnnualReturn2015 2.59%
Annual Return 2016 rr_AnnualReturn2016 1.04%
Annual Return 2017 rr_AnnualReturn2017 6.09%
Annual Return 2018 rr_AnnualReturn2018 1.50%
Annual Return 2019 rr_AnnualReturn2019 6.53%
Annual Return 2020 rr_AnnualReturn2020 4.94%
1 Year rr_AverageAnnualReturnYear01 0.04%
5 Years rr_AverageAnnualReturnYear05 3.79%
Since Inception rr_AverageAnnualReturnSinceInception 3.50%
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 01, 2014
BBH Intermediate Municipal Bond Fund | Class N Shares | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.46%
5 Years rr_AverageAnnualReturnYear05 3.56%
Since Inception rr_AverageAnnualReturnSinceInception 3.19%
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 01, 2014
BBH Intermediate Municipal Bond Fund | Class N Shares | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.02%
5 Years rr_AverageAnnualReturnYear05 3.21%
Since Inception rr_AverageAnnualReturnSinceInception 2.93%
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 01, 2014
BBH Intermediate Municipal Bond Fund | Class I Shares  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum Sales Charge (Load) Imposed on Reinvested Dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee on shares held less than 30 days after purchase (as a percentage of amount redeemed, if applicable) rr_RedemptionFeeOverRedemption 1.00%
Exchange Fee rr_ExchangeFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.40%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.05%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.45%
Less Fee Waiver/Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [1]
Total Annual Fund Operating Expenses After Fee Waiver/Expense Reimbursement rr_NetExpensesOverAssets 0.45%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination March 1, 2023
1 Year rr_ExpenseExampleYear01 $ 46
3 Years rr_ExpenseExampleYear03 144
5 Years rr_ExpenseExampleYear05 252
10 Years rr_ExpenseExampleYear10 $ 567
1 Year rr_AverageAnnualReturnYear01 0.24%
5 Years rr_AverageAnnualReturnYear05 3.96%
Since Inception rr_AverageAnnualReturnSinceInception 3.65%
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 01, 2014
[1] Brown Brothers Harriman & Co., through a separately identifiable department (the “Investment Adviser”), has contractually agreed to limit the Total Annual Fund Operating Expenses to 0.65% for Class N Shares and 0.50% for Class I Shares through March 1, 2023 (excluding interest, taxes, brokerage commissions, other expenditures that are capitalized in accordance with generally accepted accounting principles, and other extraordinary expenses not incurred in the ordinary course of the Fund’s business) (the “Expense Limitation Agreement”). The Expense Limitation Agreement may only be terminated during its term with approval of the Fund’s Board of Trustees (the “Board”).