Shareholder Report |
6 Months Ended | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Apr. 30, 2026
USD ($)
Holding
| ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Document Type | N-CSRS | |||||||||||||||||||
| Amendment Flag | false | |||||||||||||||||||
| Registrant Name | COMMERCE FUNDS | |||||||||||||||||||
| Entity Central Index Key | 0000926243 | |||||||||||||||||||
| Entity Investment Company Type | N-1A | |||||||||||||||||||
| Document Period End Date | Apr. 30, 2026 | |||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report | |||||||||||||||||||
| C000027719 | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Commerce Growth Fund | |||||||||||||||||||
| Trading Symbol | CFGRX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This Semi-Annual shareholder report contains important information about Commerce Growth Fund for the period of November 1, 2025 to April 30, 2026. | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.commercefunds.com. You can also request this information by contacting us at 1-800-995-6365. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report also describes changes to the Fund that occurred after the end of the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-995-6365 | |||||||||||||||||||
| Additional Information Website | www.commercefunds.com | |||||||||||||||||||
| Expenses [Text Block] | ||||||||||||||||||||
| Expenses Paid, Amount | $ 37 | |||||||||||||||||||
| Expense Ratio, Percent | 0.75% | [1] | ||||||||||||||||||
| Material Change Date | Apr. 30, 2026 | |||||||||||||||||||
| AssetsNet | $ 192,482,950 | |||||||||||||||||||
| Holdings Count | Holding | 52 | |||||||||||||||||||
| Advisory Fees Paid, Amount | $ 402,507 | |||||||||||||||||||
| InvestmentCompanyPortfolioTurnover | 14.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | ||||||||||||||||||||
| Holdings [Text Block] | ||||||||||||||||||||
| Largest Holdings [Text Block] | ||||||||||||||||||||
| Material Fund Change Expenses [Text Block] | At its May 14, 2026 meeting, the Board of Trustees of The Commerce Funds approved the permanent reduction of the Fund's contractual fee rate, as well as a new contractual expense limitation for the Fund. Effective August 1, 2026, under the new contractual fee rate, the Fund's management fee, calculated as a percentage of the Fund's average daily net assets, will be reduced to 0.30%, and the Fund's contractual expense limitation will be reduced to 0.70%. | |||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-995-6365 | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">commercefunds@commercebank.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | https://www.commercefunds.com/literature-and-resources/prospectus-and-guide | |||||||||||||||||||
| C000027721 | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Commerce Value Fund | |||||||||||||||||||
| Trading Symbol | CFVLX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This Semi-Annual shareholder report contains important information about Commerce Value Fund for the period of November 1, 2025 to April 30, 2026. | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.commercefunds.com. You can also request this information by contacting us at 1-800-995-6365. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report also describes changes to the Fund that occurred after the end of the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-995-6365 | |||||||||||||||||||
| Additional Information Website | www.commercefunds.com | |||||||||||||||||||
| Expenses [Text Block] | ||||||||||||||||||||
| Expenses Paid, Amount | $ 36 | |||||||||||||||||||
| Expense Ratio, Percent | 0.69% | [2] | ||||||||||||||||||
| Material Change Date | Apr. 30, 2026 | |||||||||||||||||||
| AssetsNet | $ 229,911,519 | |||||||||||||||||||
| Holdings Count | Holding | 58 | |||||||||||||||||||
| Advisory Fees Paid, Amount | $ 353,323 | |||||||||||||||||||
| InvestmentCompanyPortfolioTurnover | 19.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | ||||||||||||||||||||
| Holdings [Text Block] | ||||||||||||||||||||
| Largest Holdings [Text Block] | ||||||||||||||||||||
| Material Fund Change Expenses [Text Block] | At its May 14, 2026 meeting, the Board of Trustees of The Commerce Funds approved the permanent reduction of the Fund's contractual fee rate. Effective August 1, 2026, under the new contractual fee rate, the Fund's management fee, calculated as a percentage of the Fund's average daily net assets, will be reduced to 0.25%. | |||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-995-6365 | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">commercefunds@commercebank.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | https://www.commercefunds.com/literature-and-resources/prospectus-and-guide | |||||||||||||||||||
| C000027723 | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Commerce MidCap Growth Fund | |||||||||||||||||||
| Trading Symbol | CFAGX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This Semi-Annual shareholder report contains important information about Commerce MidCap Growth Fund for the period of November 1, 2025 to April 30, 2026. | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.commercefunds.com. You can also request this information by contacting us at 1-800-995-6365. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report also describes changes to the Fund that occurred after the end of the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-995-6365 | |||||||||||||||||||
| Additional Information Website | www.commercefunds.com | |||||||||||||||||||
| Expenses [Text Block] | ||||||||||||||||||||
| Expenses Paid, Amount | $ 44 | |||||||||||||||||||
| Expense Ratio, Percent | 0.89% | [3] | ||||||||||||||||||
| Material Change Date | Apr. 30, 2026 | |||||||||||||||||||
| AssetsNet | $ 129,701,292 | |||||||||||||||||||
| Holdings Count | Holding | 76 | |||||||||||||||||||
| Advisory Fees Paid, Amount | $ 362,430 | |||||||||||||||||||
| InvestmentCompanyPortfolioTurnover | 28.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | ||||||||||||||||||||
| Holdings [Text Block] | ||||||||||||||||||||
| Largest Holdings [Text Block] | ||||||||||||||||||||
| Material Fund Change Expenses [Text Block] | At its May 14, 2026 meeting, the Board of Trustees of The Commerce Funds approved the permanent reduction of the Fund's contractual fee rate. Effective August 1, 2026, under the new contractual fee rate, the Fund's management fee, calculated as a percentage of the Fund's average daily net assets, will be reduced to 0.30%. | |||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-995-6365 | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">commercefunds@commercebank.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | https://www.commercefunds.com/literature-and-resources/prospectus-and-guide | |||||||||||||||||||
| C000246257 | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Commerce MidCap Value Fund | |||||||||||||||||||
| Trading Symbol | CFMVX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This Semi-Annual shareholder report contains important information about Commerce MidCap Value Fund for the period of November 1, 2025 to April 30, 2026. | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.commercefunds.com. You can also request this information by contacting us at 1-800-995-6365. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report also describes changes to the Fund that occurred after the end of the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-995-6365 | |||||||||||||||||||
| Additional Information Website | www.commercefunds.com | |||||||||||||||||||
| Expenses [Text Block] | ||||||||||||||||||||
| Expenses Paid, Amount | $ 37 | |||||||||||||||||||
| Expense Ratio, Percent | 0.70% | [4] | ||||||||||||||||||
| Material Change Date | Apr. 30, 2026 | |||||||||||||||||||
| AssetsNet | $ 38,981,055 | |||||||||||||||||||
| Holdings Count | Holding | 81 | |||||||||||||||||||
| Advisory Fees Paid, Amount | $ 31,780 | |||||||||||||||||||
| InvestmentCompanyPortfolioTurnover | 28.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | ||||||||||||||||||||
| Holdings [Text Block] | ||||||||||||||||||||
| Largest Holdings [Text Block] | ||||||||||||||||||||
| Material Fund Change Expenses [Text Block] | At its May 14, 2026 meeting, the Board of Trustees of The Commerce Funds approved the permanent reduction of the Fund's contractual fee rate. Effective August 1, 2026, under the new contractual fee rate, the Fund's management fee, calculated as a percentage of the Fund's average daily net assets, will be reduced to 0.30%. | |||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-995-6365 | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">commercefunds@commercebank.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | https://www.commercefunds.com/literature-and-resources/prospectus-and-guide | |||||||||||||||||||
| C000027729 | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Commerce Bond Fund | |||||||||||||||||||
| Trading Symbol | CFBNX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This Semi-Annual shareholder report contains important information about Commerce Bond Fund for the period of November 1, 2025 to April 30, 2026. | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.commercefunds.com. You can also request this information by contacting us at 1-800-995-6365. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report also describes changes to the Fund that occurred after the end of the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-995-6365 | |||||||||||||||||||
| Additional Information Website | www.commercefunds.com | |||||||||||||||||||
| Expenses [Text Block] | ||||||||||||||||||||
| Expenses Paid, Amount | $ 31 | |||||||||||||||||||
| Expense Ratio, Percent | 0.63% | [5] | ||||||||||||||||||
| Material Change Date | Apr. 30, 2026 | |||||||||||||||||||
| AssetsNet | $ 1,226,915,792 | |||||||||||||||||||
| Holdings Count | Holding | 461 | |||||||||||||||||||
| Advisory Fees Paid, Amount | $ 2,188,059 | |||||||||||||||||||
| InvestmentCompanyPortfolioTurnover | 5.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | ||||||||||||||||||||
| Holdings [Text Block] | ||||||||||||||||||||
| Credit Ratings Selection [Text Block] | For financial reporting purposes, credit quality ratings shown above reflect the highest rating assigned by either S&P Global Ratings or Moody’s Investors Service, Inc. if ratings differ. These rating agencies are independent, nationally recognized statistical rating organizations and are widely used. Investment grade ratings are credit ratings of BBB/Baa or higher. Below investment grade ratings are credit ratings of BB/Ba or lower. Investments designated Non-Rated or N/R are not rated by either rating agency. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change. | |||||||||||||||||||
| Material Fund Change Expenses [Text Block] | At its May 14, 2026 meeting, the Board of Trustees of The Commerce Funds approved the permanent reduction of the Fund's contractual fee rate, as well as a new contractual expense limitation for the Fund. Effective August 1, 2026, under the new contractual fee rate, the Fund's management fee, calculated as a percentage of the Fund's average daily net assets, will be reduced to 0.13%, and the Fund's contractual expense limitation will be reduced to 0.45%. | |||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-995-6365 | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">commercefunds@commercebank.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | https://www.commercefunds.com/literature-and-resources/prospectus-and-guide | |||||||||||||||||||
| C000027731 | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Commerce Short-Term Government Fund | |||||||||||||||||||
| Trading Symbol | CFSTX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This Semi-Annual shareholder report contains important information about Commerce Short-Term Government Fund for the period of November 1, 2025 to April 30, 2026. | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.commercefunds.com. You can also request this information by contacting us at 1-800-995-6365. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report also describes changes to the Fund that occurred after the end of the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-995-6365 | |||||||||||||||||||
| Additional Information Website | www.commercefunds.com | |||||||||||||||||||
| Expenses [Text Block] | ||||||||||||||||||||
| Expenses Paid, Amount | $ 34 | |||||||||||||||||||
| Expense Ratio, Percent | 0.68% | [6] | ||||||||||||||||||
| Material Change Date | Apr. 30, 2026 | |||||||||||||||||||
| AssetsNet | $ 27,971,279 | |||||||||||||||||||
| Holdings Count | Holding | 113 | |||||||||||||||||||
| Advisory Fees Paid, Amount | $ 0 | |||||||||||||||||||
| InvestmentCompanyPortfolioTurnover | 6.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | ||||||||||||||||||||
| Holdings [Text Block] | ||||||||||||||||||||
| Credit Ratings Selection [Text Block] | For financial reporting purposes, credit quality ratings shown above reflect the highest rating assigned by either S&P Global Ratings or Moody’s Investors Service, Inc. if ratings differ. These rating agencies are independent, nationally recognized statistical rating organizations and are widely used. Investment grade ratings are credit ratings of BBB/Baa or higher. Below investment grade ratings are credit ratings of BB/Ba or lower. Investments designated Non-Rated or N/R are not rated by either rating agency. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change. | |||||||||||||||||||
| Material Fund Change Objectives [Text Block] | At its May 14, 2026 meeting, the Board of Trustees of The Commerce Funds approved a plan to liquidate and terminate the Fund (the "Liquidation"). The Liquidation is anticipated to occur on or about August 31, 2026. |
|||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-995-6365 | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">commercefunds@commercebank.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | https://www.commercefunds.com/literature-and-resources/prospectus-and-guide | |||||||||||||||||||
| C000027733 | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Commerce National Tax-Free Intermediate Bond Fund | |||||||||||||||||||
| Trading Symbol | CFNLX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This Semi-Annual shareholder report contains important information about Commerce National Tax-Free Intermediate Bond Fund for the period of November 1, 2025 to April 30, 2026. | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.commercefunds.com. You can also request this information by contacting us at 1-800-995-6365. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report also describes changes to the Fund that occurred after the end of the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-995-6365 | |||||||||||||||||||
| Additional Information Website | www.commercefunds.com | |||||||||||||||||||
| Expenses [Text Block] | ||||||||||||||||||||
| Expenses Paid, Amount | $ 31 | |||||||||||||||||||
| Expense Ratio, Percent | 0.62% | [7] | ||||||||||||||||||
| Material Change Date | Apr. 30, 2026 | |||||||||||||||||||
| AssetsNet | $ 349,540,343 | |||||||||||||||||||
| Holdings Count | Holding | 352 | |||||||||||||||||||
| Advisory Fees Paid, Amount | $ 610,015 | |||||||||||||||||||
| InvestmentCompanyPortfolioTurnover | 10.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | ||||||||||||||||||||
| Holdings [Text Block] | ||||||||||||||||||||
| Credit Ratings Selection [Text Block] | For financial reporting purposes, credit quality ratings shown above reflect the highest rating assigned by either S&P Global Ratings or Moody’s Investors Service, Inc. if ratings differ. These rating agencies are independent, nationally recognized statistical rating organizations and are widely used. Investment grade ratings are credit ratings of BBB/Baa or higher. Below investment grade ratings are credit ratings of BB/Ba or lower. Investments designated Non-Rated or N/R are not rated by either rating agency. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change. | |||||||||||||||||||
| Material Fund Change Expenses [Text Block] | At its May 14, 2026 meeting, the Board of Trustees of The Commerce Funds approved the permanent reduction of the Fund's contractual fee rate. Effective August 1, 2026, under the new contractual fee rate, the Fund's management fee, calculated as a percentage of the Fund's average daily net assets, will be reduced to 0.30%. | |||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-995-6365 | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">commercefunds@commercebank.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | https://www.commercefunds.com/literature-and-resources/prospectus-and-guide | |||||||||||||||||||
| C000027715 | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Commerce Missouri Tax-Free Intermediate Bond Fund | |||||||||||||||||||
| Trading Symbol | CFMOX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This Semi-Annual shareholder report contains important information about Commerce Missouri Tax-Free Intermediate Bond Fund for the period of November 1, 2025 to April 30, 2026. | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.commercefunds.com. You can also request this information by contacting us at 1-800-995-6365. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report also describes changes to the Fund that occurred after the end of the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-995-6365 | |||||||||||||||||||
| Additional Information Website | www.commercefunds.com | |||||||||||||||||||
| Expenses [Text Block] | ||||||||||||||||||||
| Expenses Paid, Amount | $ 34 | |||||||||||||||||||
| Expense Ratio, Percent | 0.69% | [8] | ||||||||||||||||||
| Material Change Date | Apr. 30, 2026 | |||||||||||||||||||
| AssetsNet | $ 218,876,190 | |||||||||||||||||||
| Holdings Count | Holding | 208 | |||||||||||||||||||
| Advisory Fees Paid, Amount | $ 459,042 | |||||||||||||||||||
| InvestmentCompanyPortfolioTurnover | 8.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | ||||||||||||||||||||
| Holdings [Text Block] | ||||||||||||||||||||
| Credit Ratings Selection [Text Block] | For financial reporting purposes, credit quality ratings shown above reflect the highest rating assigned by either S&P Global Ratings or Moody’s Investors Service, Inc. if ratings differ. These rating agencies are independent, nationally recognized statistical rating organizations and are widely used. Investment grade ratings are credit ratings of BBB/Baa or higher. Below investment grade ratings are credit ratings of BB/Ba or lower. Investments designated Non-Rated or N/R are not rated by either rating agency. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change. | |||||||||||||||||||
| Material Fund Change Expenses [Text Block] | At its May 14, 2026 meeting, the Board of Trustees of The Commerce Funds approved the permanent reduction of the Fund's contractual fee rate. Effective August 1, 2026, under the new contractual fee rate, the Fund's management fee, calculated as a percentage of the Fund's average daily net assets, will be reduced to 0.30%. | |||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-995-6365 | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">commercefunds@commercebank.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | https://www.commercefunds.com/literature-and-resources/prospectus-and-guide | |||||||||||||||||||
| C000027717 | ||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||
| Fund Name | Commerce Kansas Tax-Free Intermediate Bond Fund | |||||||||||||||||||
| Trading Symbol | KTXIX | |||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This Semi-Annual shareholder report contains important information about Commerce Kansas Tax-Free Intermediate Bond Fund for the period of November 1, 2025 to April 30, 2026. | |||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.commercefunds.com. You can also request this information by contacting us at 1-800-995-6365. | |||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report also describes changes to the Fund that occurred after the end of the reporting period. | |||||||||||||||||||
| Additional Information Phone Number | 1-800-995-6365 | |||||||||||||||||||
| Additional Information Website | www.commercefunds.com | |||||||||||||||||||
| Expenses [Text Block] | ||||||||||||||||||||
| Expenses Paid, Amount | $ 35 | |||||||||||||||||||
| Expense Ratio, Percent | 0.70% | [9] | ||||||||||||||||||
| Material Change Date | Apr. 30, 2026 | |||||||||||||||||||
| AssetsNet | $ 101,177,343 | |||||||||||||||||||
| Holdings Count | Holding | 106 | |||||||||||||||||||
| Advisory Fees Paid, Amount | $ 173,796 | |||||||||||||||||||
| InvestmentCompanyPortfolioTurnover | 12.00% | |||||||||||||||||||
| Additional Fund Statistics [Text Block] | ||||||||||||||||||||
| Holdings [Text Block] | ||||||||||||||||||||
| Credit Ratings Selection [Text Block] | For financial reporting purposes, credit quality ratings shown above reflect the highest rating assigned by either S&P Global Ratings or Moody’s Investors Service, Inc. if ratings differ. These rating agencies are independent, nationally recognized statistical rating organizations and are widely used. Investment grade ratings are credit ratings of BBB/Baa or higher. Below investment grade ratings are credit ratings of BB/Ba or lower. Investments designated Non-Rated or N/R are not rated by either rating agency. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change. | |||||||||||||||||||
| Material Fund Change Expenses [Text Block] | At its May 14, 2026 meeting, the Board of Trustees of The Commerce Funds approved the permanent reduction of the Fund's contractual fee rate. Effective August 1, 2026, under the new contractual fee rate, the Fund's management fee, calculated as a percentage of the Fund's average daily net assets, will be reduced to 0.30%. | |||||||||||||||||||
| Updated Prospectus Phone Number | 1-800-995-6365 | |||||||||||||||||||
| Updated Prospectus Email Address | <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">commercefunds@commercebank.com</span> | |||||||||||||||||||
| Updated Prospectus Web Address | https://www.commercefunds.com/literature-and-resources/prospectus-and-guide | |||||||||||||||||||
| ||||||||||||||||||||