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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName COMMERCE FUNDS
Prospectus Date rr_ProspectusDate Mar. 01, 2020
Commerce Growth Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Commerce Growth Fund – Summary
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The investment objective of the Fund is to seek capital appreciation.
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 and hold shares of the Fund. There is no sales charge imposed on purchases of shares.
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)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination March 1, 2021
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%
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees The “Total Annual Fund Operating Expenses” do not correlate to the ratios of net and total expenses to average net assets provided in the Financial Highlights, which reflect the operating expenses of the Fund and do not include Acquired (Underlying) Fund Fees and Expenses.
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
  • Under normal market conditions, the Fund invests at least 65% of its total assets in stocks, primarily common stock.
  • Using a predominantly quantitative analysis, with some additional fundamental analysis depending on market conditions, the Fund invests principally in stocks of companies that had low price volatility in the past. The Fund’s Adviser believes that investing in a portfolio of companies with low price volatility will lead to future capital appreciation.
  • The Fund may invest a significant amount of its assets from time to time in technology sectors.
  • The Fund generally purchases common stock of companies whose characteristics are comparable to those included in the Russell 1000® Growth Index (“Index”). The equity capitalization range of public companies in the Index was $1.2 billion to $1,305 billion as of December 31, 2019.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration The Fund may invest a significant amount of its assets from time to time in technology sectors.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock Market Risk:  The market values of equity securities owned by the Fund may decline, at times sharply and unpredictably. It includes the risk that a particular style of investing, such as growth, may underperform other styles of investing or the market generally.

Investment Risk:  The value of your investment in this Fund may fluctuate, which means that you could lose money. The types of stocks held by the Fund may not perform as well as other types of stocks.

Equity Securities Risk:  Common stockholders participate in company profits through dividends and stock market appreciation and, in the event of bankruptcy, distributions, on a pro-rata basis after other claims are satisfied. Many factors affect the value of common stock, including earnings, earnings forecasts, corporate events and factors impacting the issuer’s industry and the market generally. Common stock generally has the greatest appreciation and depreciation potential of all corporate securities.

Quantitative Model Risk:  Securities selected using quantitative models may perform differently from the market as a whole for many reasons, including the factors used in building the model and the weights placed on each factor, among others. The quantitative model used by the Adviser to manage the Fund may not perform as expected, particularly in volatile markets.

Management Risk:  A strategy used by the Adviser may fail to produce the intended results.

Large-Cap Risk:  Large capitalization companies may be less able than smaller capitalization companies to adapt to changing market conditions. Large capitalization companies may be more mature and subject to more limited growth potential compared with smaller capitalization companies. Over certain periods, the performance of large capitalization companies has trailed the overall performance of the broader securities markets.

Growth Investing Risk:  Growth stocks are typically priced higher than other stocks, in relation to earnings and other measures, because investors believe they have more growth potential. This potential may or may not be realized and, if it is not realized, may result in a loss to the Fund. Growth stock prices also tend to be more volatile than the overall market. Because different types of stocks go out of favor with investors depending on market and economic conditions, the Fund’s return may be adversely affected during a market downturn and when growth stocks are out of favor.

Mid-Cap Risk:  Investing in securities of mid-sized companies may be riskier than investing in larger, more established companies. Mid-sized companies are more vulnerable to adverse developments because of more limited product lines, markets or financial resources. Also, these stocks may trade less often and in limited volume compared to larger cap stocks trading on a national securities exchange. The prices of these stocks may be more volatile than the prices of larger company stocks. As a result, the Fund’s net asset value may be subject to rapid and substantial changes.

Issuer Risk:  The value of a security owned by the Fund may decline for a reason directly related to the issuer, such as management performance, financial leverage and reduced demand for the issuer’s goods or services.

Technology Securities Risk:  The securities of technology companies may be subject to greater price volatility than securities of companies in other sectors. Technology companies may produce or use products or services that prove commercially unsuccessful, or become obsolete, or may be adversely impacted by government regulation. Technology securities may experience significant price movements caused by disproportionate investor optimism or pessimism.

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 share purchases may 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.

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.

Please see “More Information on Investment Objectives, Securities, Investment Practices and Risks” for a more detailed description of the investment practices of the Fund and the risks associated with those practices. As with any mutual fund, it is possible to lose money on an investment in the Fund. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any government agency. The Fund should not be relied upon as a complete investment program. There can be no assurance that the Fund will achieve its investment objective.
Risk Lose Money [Text] rr_RiskLoseMoney As with any mutual fund, it is possible to lose money on an investment in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any government agency.
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. 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.
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 RETURN CALENDAR YEAR
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best Quarter*
Q1 ‘12
Worst Quarter*
Q3 ‘11
  
+15.62%
 
–15.32%
   

* 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 Returns For the periods ended December 31, 2019
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-deferred 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-deferred arrangements such as a 401(k) plan or individual retirement account (IRA).
Commerce Growth Fund | Growth Fund  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (load) Imposed on Redemptions rr_MaximumDeferredSalesChargeOverOther none
Maximum Sales Charge (load) Imposed on Reinvested Distributions rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fees rr_RedemptionFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.40%
Other Expenses rr_OtherExpensesOverAssets 0.35%
Acquired (Underlying) Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.76% [1],[2]
1 Year rr_ExpenseExampleYear01 $ 77
3 Years rr_ExpenseExampleYear03 242
5 Years rr_ExpenseExampleYear05 421
10 Years rr_ExpenseExampleYear10 $ 939
2010 rr_AnnualReturn2010 13.27%
2011 rr_AnnualReturn2011 (2.40%)
2012 rr_AnnualReturn2012 14.71%
2013 rr_AnnualReturn2013 29.41%
2014 rr_AnnualReturn2014 15.11%
2015 rr_AnnualReturn2015 5.47%
2016 rr_AnnualReturn2016 8.69%
2017 rr_AnnualReturn2017 27.55%
2018 rr_AnnualReturn2018 (0.86%)
2019 rr_AnnualReturn2019 35.55%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2012
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 15.62%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (15.32%)
1 Year rr_AverageAnnualReturnYear01 35.55%
5 Years rr_AverageAnnualReturnYear05 14.46%
10 Years rr_AverageAnnualReturnYear10 14.02%
Commerce Growth Fund | Returns After Taxes on Distributions | Growth Fund  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 33.70%
5 Years rr_AverageAnnualReturnYear05 12.40%
10 Years rr_AverageAnnualReturnYear10 11.75%
Commerce Growth Fund | Returns After Taxes on Distributions and Sale of Shares | Growth Fund  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 22.31%
5 Years rr_AverageAnnualReturnYear05 11.10%
10 Years rr_AverageAnnualReturnYear10 10.92%
Commerce Growth Fund | Russell 1000® Growth Index  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 36.39% [3]
5 Years rr_AverageAnnualReturnYear05 14.63% [3]
10 Years rr_AverageAnnualReturnYear10 15.22% [3]
[1] Commerce Investment Advisors, Inc. (“Commerce” or the “Adviser”) has contractually agreed to reduce or limit the Total Annual Fund Operating Expenses, excluding interest, taxes, acquired fund fees and expenses and extraordinary expenses, during the current fiscal year to 1.00% of the Fund’s average daily net assets through March 1, 2021. After this date, the Adviser or the Fund may terminate the contractual arrangement.
[2] The “Total Annual Fund Operating Expenses” do not correlate to the ratios of net and total expenses to average net assets provided in the Financial Highlights, which reflect the operating expenses of the Fund and do not include Acquired (Underlying) Fund Fees and Expenses.
[3] The Russell 1000® Growth Index, an unmanaged index, measures the performance of the large-cap growth segment of the U.S. equity universe. It includes those Russell 1000 companies with higher price-to-book ratios and higher forecasted growth values. The Index figures do not reflect any deduction for fees, taxes or expenses.