v3.25.0.1
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The National Tax-Free Intermediate Bond Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading The National Tax‑Free Intermediate Bond Fund – Summary
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The investment objective of the Fund is to seek current income exempt from federal income tax as is consistent with the preservation of capital.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and the Example below. There is no sales charge imposed on purchases of shares.
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination March 1, 2026
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 39% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 39.00%
Expense Example [Heading] rr_ExpenseExampleHeading Example:
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock  This Example is intended to help you compare the cost of investing in this Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in shares of 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. 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
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Security Types: Under normal market conditions, the Fund invests at least 80% of its net assets plus any borrowings for investment purposes, (measured at the time of purchase) in municipal bonds issued by or on behalf of the states, territories and possessions (such as Puerto Rico, the U.S. Virgin Islands and Guam) of the United States, the District of Columbia and their respective authorities, agencies, instrumentalities and political subdivisions, the income from which, in the opinion of bond counsel, is exempt from regular federal income and federal alternative minimum taxes. Alternatively, at least 80% of the Fund’s distributed income must be exempt from such taxes. The Fund’s 80% investment strategy is fundamental–meaning that it can be changed only by the holders of a majority of the outstanding voting securities of the Fund.
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Up to 20% of the Fund’s net assets may be invested in municipal bonds that are not exempt from regular federal income tax or federal alternative minimum taxes.
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Credit Quality: Except as described below, the municipal securities in which the Fund invests will be rated investment grade (e.g., in the top four credit-rating categories) at the time of purchase by at least one nationally recognized statistical rating organization, or if unrated will be deemed by the Adviser to be of comparable quality to investment grade municipal securities. The Fund may invest up to 10% of its total assets in such unrated securities. The Fund may invest up to 5% of its total assets in high yield (non-investment grade) securities known as junk bonds. Subsequent to purchase, the Fund’s municipal securities may be downgraded below investment grade or may be deemed by the Adviser to be no longer comparable to investment grade securities. The Adviser will consider such an event in determining whether the Fund should continue to hold the security, except that the Fund may not hold more than 5% of its total assets in high yield (non-investment grade) securities.
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Maturity Distribution: The Fund actively manages maturities to take advantage of changes in interest rates. The average dollar-weighted effective maturity of the Fund’s portfolio securities will be five to twelve years, under normal market conditions.
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Duration: The average effective duration of the Fund will be within 30% of the duration of the Bloomberg 3‑15 Year Blend Municipal Bond Index (“Index”), although the Fund has no restriction as to the maximum or minimum duration of any individual security it holds. For example, if the duration of the Index were 5.0 years, the Fund’s assets would have a duration of between 3.5 years and 6.5 years. As of December 31, 2024, the duration of the Fund was 5.98, while the duration of the Index was 5.09. Duration is a measure of a fund’s sensitivity to interest rates. For example, a fund with a duration of 2 years would lose 2% of its value if interest rates rose by 1%, or it would gain 2% if interest rates declined by 1%. A fund with a duration of 4 years would be twice as volatile as a fund with a duration of 2 years.
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The Fund strives to minimize net realized capital gains.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Fund Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The bar chart and table below provide an indication of the risks of investing in the Fund by showing: (a) changes in the performance of the Fund’s shares from year to year; and (b) how the average annual total returns of the Fund’s shares compare to those of a broad-based securities market index and an additional index with characteristics relevant to the Fund. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. To obtain updated performance information, please visit the Fund’s website at www.commercefunds.com or by calling 1-800-995-6365.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table below provide an indication of the risks of investing in the Fund by showing: (a) changes in the performance of the Fund’s shares from year to year; and (b) how the average annual total returns of the Fund’s shares compare to those of a broad-based securities market index and an additional index with characteristics relevant to the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The Bloomberg 3-15 Year Blend Municipal Bond Index is an unmanaged index comprised of investment-grade municipal securities ranging from 2 to 17 years in maturity.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-995-6365
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.commercefunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Year-by-Year Total Returns as of 12/31 Each Year TOTAL RETURNCALENDAR YEAR
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock Best Quarter* Q4 ‘23 7.21% Worst Quarter* Q1 ‘22 –5.43% * Please note that “Best Quarter” and “Worst Quarter” figures are applicable only to the time period covered by the bar chart.
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods endedDecember 31, 2024
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged In connection with a new regulatory requirement, effective October 31, 2024, the Fund changed its broad based index to the Bloomberg Municipal Bond Index.
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes The Index figures do not reflect any deduction for fees, taxes or expenses.
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns below 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 Fund shares through tax-advantaged arrangements such as a 401(k) plan or individual retirement account (IRA).
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock
After-tax returns below 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 Fund shares through tax-advantaged arrangements such as a 401(k) plan or individual retirement account (IRA).
The National Tax-Free Intermediate Bond Fund | Risk Lose Money [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock As with any mutual fund, it is possible to lose money on an investment in the Fund.
The National Tax-Free Intermediate Bond Fund | Risk Not Insured Depository Institution [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a bank depositand is not insured or guaranteed by the Federal Deposit Insurance Corporation or anygovernment agency.
The National Tax-Free Intermediate Bond Fund | Market Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Market Risk: Certain securities and other investments held by the Fund may experience increased volatility, illiquidity, or other potentially adverse effects in response to changing market conditions, inflation, changes in interest rates, lack of liquidity in the bond or equity markets, volatility in the equity markets, market disruptions caused by local or regional events such as financial institution failures, war, acts of terrorism, the spread of infectious illness (including epidemics and pandemics) or other public health issues, recessions or other events or adverse investor sentiment.
The National Tax-Free Intermediate Bond Fund | Investment Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Investment Risk: The value of your investment in this Fund may fluctuate, which means that you could lose money.
The National Tax-Free Intermediate Bond Fund | Management Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Management Risk: A strategy used by the Adviser could fail to produce the intended results.
The National Tax-Free Intermediate Bond Fund | Large Shareholder Purchase and Redemption Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Large Shareholder Purchase and Redemption Risk: The Fund may experience adverse effects when certain large shareholders purchase or redeem large amounts of shares of the Fund. Such large shareholder redemptions may cause the Fund to sell its securities at times when it would not otherwise do so, which may negatively impact the Fund’s net asset value and liquidity. Similarly, large purchases of the Fund’s shares may also adversely affect the Fund’s performance to the extent that the Fund is delayed in investing new cash and is required to maintain a larger cash position than it ordinarily would. In addition, a large redemption could result in the Fund’s current expenses being allocated over a smaller asset base, leading to an increase in the Fund’s expense ratio.
The National Tax-Free Intermediate Bond Fund | Cybersecurity Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Cybersecurity Risk: Cybersecurity breaches may allow an unauthorized party to gain access to Fund assets, customer data, or proprietary information, or cause the Fund and/or its service providers to suffer data corruption or lose operational functionality.
The National Tax-Free Intermediate Bond Fund | Interest Rate Risks [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Interest Rate Risk: Interest rate risk is the risk that the value of the Fund’s portfolio will decline when interest rates rise. The magnitude of this decline will often be greater for longer-term, fixed-income securities than shorter-term securities. Changing interest rates may have unpredictable effects on the markets and on the Fund’s investments. Declines in interest rate levels could cause the Fund’s earnings to fall below the Fund’s expense ratio, resulting in a negative yield and a decline in the Fund’s share price. The magnitude of these fluctuations in the market price of bonds and other fixed-income securities is generally greater for those securities with longer maturities. Fluctuations in the market price of the Fund’s investments will not affect interest income derived from instruments already owned by the Fund, but will be reflected in the Fund’s net asset value. The Fund may lose money if short-term or long-term interest rates rise sharply in a manner not anticipated by Fund management. A general rise in interest rates has the potential to cause investors to move out of fixed-income securities on a large scale, which may increase redemptions from funds that hold large amounts of fixed-income securities. Heavy redemptions could cause the Fund to sell assets at inopportune times or at a loss or depressed value and could hurt the Fund’s performance.
The National Tax-Free Intermediate Bond Fund | Income Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Income Risk: The Fund’s ability to distribute income to shareholders depends on the yield available from the Fund’s investments. The Fund’s portfolio income may decline when market interest rates fall.
The National Tax-Free Intermediate Bond Fund | Credit Risks [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Credit Risk: Credit risk is the risk that an issuer of a municipal bond may be unable or unwilling to make interest and principal payments when due and the related risk that the value of a bond may decline because of concerns about the issuer’s ability or willingness to make such payments. If a bond’s insurer or provider of other credit enhancement fails to fulfill its obligations or loses its credit rating, the value of the bond could drop. This may impair the Fund’s liquidity or cause a deterioration in the Fund’s net asset value. In addition, the Fund may incur expenses in an effort to protect the Fund’s interests or enforce its rights against an issuer, guarantor or counterparty or may be hindered or delayed in exercising these rights.
The National Tax-Free Intermediate Bond Fund | Call Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Call Risk: An issuer may exercise its right to pay principal on an obligation held by the Fund earlier than expected. Under these circumstances, the Fund may be unable to recoup all of its initial investment and may also suffer from having to reinvest in lower yielding securities, securities with greater credit risks or securities with other, less favorable features.
The National Tax-Free Intermediate Bond Fund | Maturity Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Maturity Risk: The Fund will not necessarily hold its securities to maturity, which could result in loss of principal.
The National Tax-Free Intermediate Bond Fund | High Yield Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
High Yield Risk: High yield securities are subject to greater levels of credit and liquidity risk. High yield securities are considered speculative with respect to an issuer’s ability to make principal and interest payments and may be more volatile than higher-rated securities of similar maturity.
The National Tax-Free Intermediate Bond Fund | Liquidity Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Liquidity Risk: The Fund may not be able to pay redemption proceeds within the time periods described in this Prospectus because of unusual market conditions, an unusually high number of redemption requests or other reasons. Liquidity risk may result from the lack of an active market or reduced number and capacity of traditional market participants to make a market in fixed income securities, and may be magnified in a rising interest rate environment or other circumstances where investor redemptions from fixed income mutual funds may be higher than normal, causing increased supply in the market due to selling activity. Certain portfolio securities may be less liquid than others, which may make them difficult or impossible to sell at an advantageous time or price.
The National Tax-Free Intermediate Bond Fund | Municipal Bond Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Municipal Bond Risk: Municipal securities prices can be significantly affected by political or public health changes as well as uncertainties in the municipal market related to taxation, legislative changes or the rights of municipal security holders. In addition, economic conditions at the state, regional and federal level may adversely affect the municipal bond market and an issuer’s ability to repay the obligation. Municipal lease obligations and certificates of participation are subject to the added risk that the governmental lessee will fail to appropriate funds to enable it to meet its payment obligations under the lease. While interest earned on municipal securities is generally not subject to federal tax, any interest earned on taxable municipal securities is fully taxable at the federal level and may be subject to tax at the state level.
The National Tax-Free Intermediate Bond Fund | Tax Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Tax Risk: Income from municipal bonds held by the Fund could be declared taxable because of unfavorable changes in tax laws, adverse interpretations by the Internal Revenue Service or state tax authorities, or noncompliant conduct of a bond issuer. In addition, a portion of the Fund’s otherwise exempt-interest dividends may be taxable to those shareholders subject to the federal alternative minimum tax.
The National Tax-Free Intermediate Bond Fund | State and US Territory Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
State and U.S. Territory Risk: The Fund’s portfolio is generally widely diversified among issuers of municipal securities. From time to time, however, the Fund may invest a significant amount of assets in the municipal securities of a particular state or territory. Adverse political and economic conditions and developments affecting a state or territory may, in turn, negatively affect the Fund’s performance, and the Fund’s investments may be more volatile, than if its investments were not so concentrated in such state or territory.
The National Tax-Free Intermediate Bond Fund | National Tax-Free Intermediate Bond Fund  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.34%
Other Expenses rr_OtherExpensesOverAssets 0.29%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.63% [1]
1 Year rr_ExpenseExampleYear01 $ 64
3 Years rr_ExpenseExampleYear03 202
5 Years rr_ExpenseExampleYear05 351
10 Years rr_ExpenseExampleYear10 $ 786
2015 rr_AnnualReturn2015 2.96%
2016 rr_AnnualReturn2016 0.05%
2017 rr_AnnualReturn2017 4.81%
2018 rr_AnnualReturn2018 0.80%
2019 rr_AnnualReturn2019 6.62%
2020 rr_AnnualReturn2020 4.67%
2021 rr_AnnualReturn2021 0.40%
2022 rr_AnnualReturn2022 (7.13%)
2023 rr_AnnualReturn2023 4.81%
2024 rr_AnnualReturn2024 0.87%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2023
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 7.21%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2022
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (5.43%)
1 Year rr_AverageAnnualReturnYear01 0.87%
5 Years rr_AverageAnnualReturnYear05 0.63%
10 Years rr_AverageAnnualReturnYear10 1.82%
The National Tax-Free Intermediate Bond Fund | Returns After Taxes on Distributions | National Tax-Free Intermediate Bond Fund  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.87%
5 Years rr_AverageAnnualReturnYear05 0.54%
10 Years rr_AverageAnnualReturnYear10 1.72%
The National Tax-Free Intermediate Bond Fund | Returns After Taxes on Distributions and Sale of Shares | National Tax-Free Intermediate Bond Fund  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.54%
5 Years rr_AverageAnnualReturnYear05 0.90%
10 Years rr_AverageAnnualReturnYear10 1.84%
The National Tax-Free Intermediate Bond Fund | Bloomberg Municipal Bond Index  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.05% [2]
5 Years rr_AverageAnnualReturnYear05 0.99% [2]
10 Years rr_AverageAnnualReturnYear10 2.25% [2]
The National Tax-Free Intermediate Bond Fund | Bloomberg 3-15 Year Blend Municipal Bond Index  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.71% [3]
5 Years rr_AverageAnnualReturnYear05 1.05% [3]
10 Years rr_AverageAnnualReturnYear10 2.12% [3]
[1] Commerce Investment Advisors, Inc. (“Commerce” or the “Adviser”) has contractually agreed to waive all or a portion of its investment advisory fees and/or reimburse expenses in amounts necessary so that after such waivers and/or reimbursements, the maximum Total Annual Fund Operating Expenses during the current fiscal year do not exceed 0.70% of the Fund’s average daily net assets through March 1, 2026. After this date, the Adviser or the Fund may terminate the contractual arrangement.
[2] The Bloomberg Municipal Bond Index is an unmanaged index that measures the U.S. Dollar-denominated long-term tax exempt bond market. The Index figures do not reflect any deduction for fees, taxes or expenses. In connection with a new regulatory requirement, effective October 31, 2024, the Fund changed its broad based index to the Bloomberg Municipal Bond Index.
[3] The Bloomberg 3-15 Year Blend Municipal Bond Index is an unmanaged index comprised of investment-grade municipal securities ranging from 2 to 17 years in maturity. The Index figures do not reflect any deduction for fees, taxes or expenses.