Shareholder Report |
12 Months Ended | |||||||||||||||||||||||||
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Apr. 30, 2025
USD ($)
Holding
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Shareholder Report [Line Items] | ||||||||||||||||||||||||||
Document Type | N-CSR | |||||||||||||||||||||||||
Amendment Flag | false | |||||||||||||||||||||||||
Registrant Name | Columbia Funds Series Trust | |||||||||||||||||||||||||
Entity Central Index Key | 0001097519 | |||||||||||||||||||||||||
Entity Investment Company Type | N-1A | |||||||||||||||||||||||||
Document Period End Date | Apr. 30, 2025 | |||||||||||||||||||||||||
Columbia Short Duration Municipal Bond Fund - Class A | ||||||||||||||||||||||||||
Shareholder Report [Line Items] | ||||||||||||||||||||||||||
Fund Name | Columbia Short Duration Municipal Bond Fund | |||||||||||||||||||||||||
Class Name | Class A | |||||||||||||||||||||||||
Trading Symbol | NSMMX | |||||||||||||||||||||||||
Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Columbia Short Duration Municipal Bond Fund (the Fund) for the period of May 1, 2024 to April 30, 2025. | |||||||||||||||||||||||||
Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||
Additional Information [Text Block] | You can find additional information about the Fund at columbiathreadneedleus.com/resources/literature . You can also request more information by contacting us at 1-800-345-6611.
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Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||||||||
Additional Information Phone Number | 1-800-345-6611 | |||||||||||||||||||||||||
Additional Information Website | columbiathreadneedleus.com/resources/literature | |||||||||||||||||||||||||
Expenses [Text Block] | What were the Fund costs for the reporting period? (Based on a hypothetical $10,000 investment)
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Expenses Paid, Amount | $ 65 | |||||||||||||||||||||||||
Expense Ratio, Percent | 0.64% | |||||||||||||||||||||||||
Factors Affecting Performance [Text Block] | Management's Discussion of Fund Performance The performance of Class A shares for the period presented is shown in the Average Annual Total Returns table. Top Performance Contributors Credit quality selection | Positive contributions to benchmark-relative performance were driven by selection in bonds rated single-A and higher.Sector allocation | Overweights to housing, industrial development revenue/pollution control revenue (IDR/PCR) and continuing care retirement community (CCRC) bonds were positive contributors to the Fund’s performance relative to its benchmark.Sector security selection | Strong security selection in education, utilities, special tax, local general obligation (GO) and airport bonds contributed to the Fund’s performance relative to its benchmark. The general profile of the local GO exposure, shorter in duration and maturity, drove its strong performance.Credit quality allocation | Credit quality allocation added to the fund’s relative performance. Overweights to higher yielding nonrated, BBB and single-A rated bonds and an underweight to AA bonds added to performance during a period in which investors favored the income generated by higher yielding bonds.Top Performance Detractors Yield curve positioning | The fund’s modest overweight to longer maturity bonds (5 years and longer) detracted from performance, relative to its benchmark, as municipal market interest rates rose in this portion of the curve.Sector security selection | Security selection was positive. However, selection in CCRC, IDR/PCR and housing bonds were modest detractors.Sector allocation | While sector allocation was broadly positive, an underweight to pre-pay gas bonds was a modest detractor. |
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Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |||||||||||||||||||||||||
Line Graph [Table Text Block] | ![]() |
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Average Annual Return [Table Text Block] |
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No Deduction of Taxes [Text Block] | Performance does not reflect the deduction of taxes that a shareholder may pay on fund distributions or on the redemptions of fund shares. | |||||||||||||||||||||||||
Performance Table Market Index Changed [Text Block] | Effective August 1, 2024, the Fund compares its performance to the Bloomberg Municipal Bond Index, a broad-based performance index that meets new regulatory requirements. | |||||||||||||||||||||||||
Prior Market Index Comparison [Text Block] | The Fund’s performance is also compared to its prior benchmark, which more closely represents the market sectors and/or asset classes in which the Fund primarily invests. | |||||||||||||||||||||||||
Previous Investment Adviser [Text Block] | The Fund’s performance prior to September 1, 2022 reflects returns achieved according to different principal investment strategies. If the Fund's current strategies had been in place for the prior periods, results shown may have been different. | |||||||||||||||||||||||||
Updated Performance Information Location [Text Block] | Visit columbiathreadneedleus.com/investment-products/mutual-funds for more recent performance information.
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Net Assets | $ 294,298,942 | |||||||||||||||||||||||||
Holdings Count | Holding | 175 | |||||||||||||||||||||||||
Advisory Fees Paid, Amount | $ 1,327,636 | |||||||||||||||||||||||||
Investment Company, Portfolio Turnover | 32.00% | |||||||||||||||||||||||||
Additional Fund Statistics [Text Block] | Key Fund Statistics
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Holdings [Text Block] | Graphical Representation of Fund The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change. Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily. Top States/Territories
Asset Categories ![]() Credit Quality ![]() |
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Credit Quality Explanation [Text Block] | Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily. | |||||||||||||||||||||||||
Largest Holdings [Text Block] | Top States/Territories
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Material Fund Change [Text Block] | Certain Fund Changes This is a summary of certain changes to the Fund during the reporting period. For more complete information, you may review the Fund’s prospectus, which is available at columbiathreadneedleus.com/resources/literature 1-800-345-6611 .Effective August 1, 2024, the Fund amended its Prospectus’ Principal Investment Strategies to reflect that the Fund may enter into tender option bond (TOB) transactions and may invest in derivatives, such as floating rate municipal securities (floaters) and inverse floating rate municipal securities (inverse floaters) to add incremental income, futures (including interest rate and Treasury bond futures) to manage duration and hedge against changes in interest rates, and swaps, including Municipal Market Data Rate Locks (MMD Rate Locks) to manage duration and hedge against changes in interest rates. In addition, the Fund amended its Prospectus’ Principal Risks to include disclosure of the risks associated with investing in these instruments and derivatives generally.
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Material Fund Change Strategies [Text Block] | Effective August 1, 2024, the Fund amended its Prospectus’ Principal Investment Strategies to reflect that the Fund may enter into tender option bond (TOB) transactions and may invest in derivatives, such as floating rate municipal securities (floaters) and inverse floating rate municipal securities (inverse floaters) to add incremental income, futures (including interest rate and Treasury bond futures) to manage duration and hedge against changes in interest rates, and swaps, including Municipal Market Data Rate Locks (MMD Rate Locks) to manage duration and hedge against changes in interest rates. | |||||||||||||||||||||||||
Material Fund Change Risks Change [Text Block] | In addition, the Fund amended its Prospectus’ Principal Risks to include disclosure of the risks associated with investing in these instruments and derivatives generally. | |||||||||||||||||||||||||
Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund during the reporting period. For more complete information, you may review the Fund’s prospectus, which is available at columbiathreadneedleus.com/resources/literature 1-800-345-6611 .
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Updated Prospectus Phone Number | 1-800-345-6611 | |||||||||||||||||||||||||
Updated Prospectus Web Address | columbiathreadneedleus.com/resources/literature | |||||||||||||||||||||||||
Columbia Short Duration Municipal Bond Fund - Institutional Class | ||||||||||||||||||||||||||
Shareholder Report [Line Items] | ||||||||||||||||||||||||||
Fund Name | Columbia Short Duration Municipal Bond Fund | |||||||||||||||||||||||||
Class Name | Institutional Class | |||||||||||||||||||||||||
Trading Symbol | NSMIX | |||||||||||||||||||||||||
Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Columbia Short Duration Municipal Bond Fund (the Fund) for the period of May 1, 2024 to April 30, 2025. | |||||||||||||||||||||||||
Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||
Additional Information [Text Block] | You can find additional information about the Fund at columbiathreadneedleus.com/resources/literature . You can also request more information by contacting us at 1-800-345-6611.
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Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||||||||
Additional Information Phone Number | 1-800-345-6611 | |||||||||||||||||||||||||
Additional Information Website | columbiathreadneedleus.com/resources/literature | |||||||||||||||||||||||||
Expenses [Text Block] | What were the Fund costs for the reporting period? (Based on a hypothetical $10,000 investment)
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Expenses Paid, Amount | $ 40 | |||||||||||||||||||||||||
Expense Ratio, Percent | 0.39% | |||||||||||||||||||||||||
Factors Affecting Performance [Text Block] | Management's Discussion of Fund Performance The performance of Institutional Class shares for the period presented is shown in the Average Annual Total Returns table. Top Performance Contributors Credit quality selection | Positive contributions to benchmark-relative performance were driven by selection in bonds rated single-A and higher.Sector allocation | Overweights to housing, industrial development revenue/pollution control revenue (IDR/PCR) and continuing care retirement community (CCRC) bonds were positive contributors to the Fund’s performance relative to its benchmark.Sector security selection | Strong security selection in education, utilities, special tax, local general obligation (GO) and airport bonds contributed to the Fund’s performance relative to its benchmark. The general profile of the local GO exposure, shorter in duration and maturity, drove its strong performance.Credit quality allocation | Credit quality allocation added to the fund’s relative performance. Overweights to higher yielding nonrated, BBB and single-A rated bonds and an underweight to AA bonds added to performance during a period in which investors favored the income generated by higher yielding bonds.Top Performance Detractors Yield curve positioning | The fund’s modest overweight to longer maturity bonds (5 years and longer) detracted from performance, relative to its benchmark, as municipal market interest rates rose in this portion of the curve.Sector security selection | Security selection was positive. However, selection in CCRC, IDR/PCR and housing bonds were modest detractors.Sector allocation | While sector allocation was broadly positive, an underweight to pre-pay gas bonds was a modest detractor. |
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Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |||||||||||||||||||||||||
Line Graph [Table Text Block] | ![]() |
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Average Annual Return [Table Text Block] |
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No Deduction of Taxes [Text Block] | Performance does not reflect the deduction of taxes that a shareholder may pay on fund distributions or on the redemptions of fund shares. | |||||||||||||||||||||||||
Performance Table Market Index Changed [Text Block] | Effective August 1, 2024, the Fund compares its performance to the Bloomberg Municipal Bond Index, a broad-based performance index that meets new regulatory requirements. | |||||||||||||||||||||||||
Prior Market Index Comparison [Text Block] | The Fund’s performance is also compared to its prior benchmark, which more closely represents the market sectors and/or asset classes in which the Fund primarily invests. | |||||||||||||||||||||||||
Previous Investment Adviser [Text Block] | The Fund’s performance prior to September 1, 2022 reflects returns achieved according to different principal investment strategies. If the Fund's current strategies had been in place for the prior periods, results shown may have been different. | |||||||||||||||||||||||||
Updated Performance Information Location [Text Block] | Visit columbiathreadneedleus.com/investment-products/mutual-funds for more recent performance information.
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Net Assets | $ 294,298,942 | |||||||||||||||||||||||||
Holdings Count | Holding | 175 | |||||||||||||||||||||||||
Advisory Fees Paid, Amount | $ 1,327,636 | |||||||||||||||||||||||||
Investment Company, Portfolio Turnover | 32.00% | |||||||||||||||||||||||||
Additional Fund Statistics [Text Block] | Key Fund Statistics
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Holdings [Text Block] | Graphical Representation of Fund The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change. Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily. Top States/Territories
Asset Categories ![]() Credit Quality ![]() |
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Credit Quality Explanation [Text Block] | Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily. | |||||||||||||||||||||||||
Largest Holdings [Text Block] | Top States/Territories
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Material Fund Change [Text Block] | Certain Fund Changes This is a summary of certain changes to the Fund during the reporting period. For more complete information, you may review the Fund’s prospectus, which is available at columbiathreadneedleus.com/resources/literature or upon request at 1-800-345-6611 .Effective August 1, 2024, the Fund amended its Prospectus’ Principal Investment Strategies to reflect that the Fund may enter into tender option bond (TOB) transactions and may invest in derivatives, such as floating rate municipal securities (floaters) and inverse floating rate municipal securities (inverse floaters) to add incremental income, futures (including interest rate and Treasury bond futures) to manage duration and hedge against changes in interest rates, and swaps, including Municipal Market Data Rate Locks (MMD Rate Locks) to manage duration and hedge against changes in interest rates. In addition, the Fund amended its Prospectus’ Principal Risks to include disclosure of the risks associated with investing in these instruments and derivatives generally.
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Material Fund Change Strategies [Text Block] | Effective August 1, 2024, the Fund amended its Prospectus’ Principal Investment Strategies to reflect that the Fund may enter into tender option bond (TOB) transactions and may invest in derivatives, such as floating rate municipal securities (floaters) and inverse floating rate municipal securities (inverse floaters) to add incremental income, futures (including interest rate and Treasury bond futures) to manage duration and hedge against changes in interest rates, and swaps, including Municipal Market Data Rate Locks (MMD Rate Locks) to manage duration and hedge against changes in interest rates. | |||||||||||||||||||||||||
Material Fund Change Risks Change [Text Block] | In addition, the Fund amended its Prospectus’ Principal Risks to include disclosure of the risks associated with investing in these instruments and derivatives generally. | |||||||||||||||||||||||||
Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund during the reporting period. For more complete information, you may review the Fund’s prospectus, which is available at columbiathreadneedleus.com/resources/literature or upon request at 1-800-345-6611 .
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Updated Prospectus Phone Number | 1-800-345-6611 | |||||||||||||||||||||||||
Updated Prospectus Web Address | columbiathreadneedleus.com/resources/literature | |||||||||||||||||||||||||
Columbia Short Duration Municipal Bond Fund - Institutional 2 Class | ||||||||||||||||||||||||||
Shareholder Report [Line Items] | ||||||||||||||||||||||||||
Fund Name | Columbia Short Duration Municipal Bond Fund | |||||||||||||||||||||||||
Class Name | Institutional 2 Class | |||||||||||||||||||||||||
Trading Symbol | CNNRX | |||||||||||||||||||||||||
Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Columbia Short Duration Municipal Bond Fund (the Fund) for the period of May 1, 2024 to April 30, 2025. | |||||||||||||||||||||||||
Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||
Additional Information [Text Block] | You can find additional information about the Fund at columbiathreadneedleus.com/resources/literature . You can also request more information by contacting us at 1-800-345-6611.
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Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||||||||
Additional Information Phone Number | 1-800-345-6611 | |||||||||||||||||||||||||
Additional Information Website | columbiathreadneedleus.com/resources/literature | |||||||||||||||||||||||||
Expenses [Text Block] | What were the Fund costs for the reporting period? (Based on a hypothetical $10,000 investment)
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Expenses Paid, Amount | $ 34 | |||||||||||||||||||||||||
Expense Ratio, Percent | 0.33% | |||||||||||||||||||||||||
Factors Affecting Performance [Text Block] | Management's Discussion of Fund Performance The performance of Institutional 2 Class shares for the period presented is shown in the Average Annual Total Returns table. Top Performance Contributors Credit quality selection | Positive contributions to benchmark-relative performance were driven by selection in bonds rated single-A and higher.Sector allocation | Overweights to housing, industrial development revenue/pollution control revenue (IDR/PCR) and continuing care retirement community (CCRC) bonds were positive contributors to the Fund’s performance relative to its benchmark.Sector security selection | Strong security selection in education, utilities, special tax, local general obligation (GO) and airport bonds contributed to the Fund’s performance relative to its benchmark. The general profile of the local GO exposure, shorter in duration and maturity, drove its strong performance.Credit quality allocation | Credit quality allocation added to the fund’s relative performance. Overweights to higher yielding nonrated, BBB and single-A rated bonds and an underweight to AA bonds added to performance during a period in which investors favored the income generated by higher yielding bonds.Top Performance Detractors Yield curve positioning | The fund’s modest overweight to longer maturity bonds (5 years and longer) detracted from performance, relative to its benchmark, as municipal market interest rates rose in this portion of the curve.Sector security selection | Security selection was positive. However, selection in CCRC, IDR/PCR and housing bonds were modest detractors.Sector allocation | While sector allocation was broadly positive, an underweight to pre-pay gas bonds was a modest detractor. |
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Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |||||||||||||||||||||||||
Line Graph [Table Text Block] | ![]() |
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Average Annual Return [Table Text Block] |
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No Deduction of Taxes [Text Block] | Performance does not reflect the deduction of taxes that a shareholder may pay on fund distributions or on the redemptions of fund shares. | |||||||||||||||||||||||||
Performance Table Market Index Changed [Text Block] | Effective August 1, 2024, the Fund compares its performance to the Bloomberg Municipal Bond Index, a broad-based performance index that meets new regulatory requirements. | |||||||||||||||||||||||||
Prior Market Index Comparison [Text Block] | The Fund’s performance is also compared to its prior benchmark, which more closely represents the market sectors and/or asset classes in which the Fund primarily invests. | |||||||||||||||||||||||||
Previous Investment Adviser [Text Block] | The Fund’s performance prior to September 1, 2022 reflects returns achieved according to different principal investment strategies. If the Fund's current strategies had been in place for the prior periods, results shown may have been different. | |||||||||||||||||||||||||
Updated Performance Information Location [Text Block] | Visit columbiathreadneedleus.com/investment-products/mutual-funds for more recent performance information.
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Net Assets | $ 294,298,942 | |||||||||||||||||||||||||
Holdings Count | Holding | 175 | |||||||||||||||||||||||||
Advisory Fees Paid, Amount | $ 1,327,636 | |||||||||||||||||||||||||
Investment Company, Portfolio Turnover | 32.00% | |||||||||||||||||||||||||
Additional Fund Statistics [Text Block] | Key Fund Statistics
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Holdings [Text Block] | Graphical Representation of Fund The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change. Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily. Top States/Territories
Asset Categories ![]() Credit Quality ![]() |
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Credit Quality Explanation [Text Block] | Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily. | |||||||||||||||||||||||||
Largest Holdings [Text Block] | Top States/Territories
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Material Fund Change [Text Block] | Certain Fund Changes This is a summary of certain changes to the Fund during the reporting period. For more complete information, you may review the Fund’s prospectus, which is available at columbiathreadneedleus.com/resources/literature or upon request at 1-800-345-6611 .Effective August 1, 2024, the Fund amended its Prospectus’ Principal Investment Strategies to reflect that the Fund may enter into tender option bond (TOB) transactions and may invest in derivatives, such as floating rate municipal securities (floaters) and inverse floating rate municipal securities (inverse floaters) to add incremental income, futures (including interest rate and Treasury bond futures) to manage duration and hedge against changes in interest rates, and swaps, including Municipal Market Data Rate Locks (MMD Rate Locks) to manage duration and hedge against changes in interest rates. In addition, the Fund amended its Prospectus’ Principal Risks to include disclosure of the risks associated with investing in these instruments and derivatives generally.
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Material Fund Change Strategies [Text Block] | Effective August 1, 2024, the Fund amended its Prospectus’ Principal Investment Strategies to reflect that the Fund may enter into tender option bond (TOB) transactions and may invest in derivatives, such as floating rate municipal securities (floaters) and inverse floating rate municipal securities (inverse floaters) to add incremental income, futures (including interest rate and Treasury bond futures) to manage duration and hedge against changes in interest rates, and swaps, including Municipal Market Data Rate Locks (MMD Rate Locks) to manage duration and hedge against changes in interest rates. | |||||||||||||||||||||||||
Material Fund Change Risks Change [Text Block] | In addition, the Fund amended its Prospectus’ Principal Risks to include disclosure of the risks associated with investing in these instruments and derivatives generally. | |||||||||||||||||||||||||
Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund during the reporting period. For more complete information, you may review the Fund’s prospectus, which is available at columbiathreadneedleus.com/resources/literature or upon request at 1-800-345-6611 .
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Updated Prospectus Phone Number | 1-800-345-6611 | |||||||||||||||||||||||||
Updated Prospectus Web Address | columbiathreadneedleus.com/resources/literature | |||||||||||||||||||||||||
Columbia Short Duration Municipal Bond Fund - Institutional 3 Class | ||||||||||||||||||||||||||
Shareholder Report [Line Items] | ||||||||||||||||||||||||||
Fund Name | Columbia Short Duration Municipal Bond Fund | |||||||||||||||||||||||||
Class Name | Institutional 3 Class | |||||||||||||||||||||||||
Trading Symbol | CSMYX | |||||||||||||||||||||||||
Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Columbia Short Duration Municipal Bond Fund (the Fund) for the period of May 1, 2024 to April 30, 2025. | |||||||||||||||||||||||||
Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||
Additional Information [Text Block] | You can find additional information about the Fund at columbiathreadneedleus.com/resources/literature . You can also request more information by contacting us at 1-800-345-6611.
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Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||||||||
Additional Information Phone Number | 1-800-345-6611 | |||||||||||||||||||||||||
Additional Information Website | columbiathreadneedleus.com/resources/literature | |||||||||||||||||||||||||
Expenses [Text Block] | What were the Fund costs for the reporting period? (Based on a hypothetical $10,000 investment)
|
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Expenses Paid, Amount | $ 30 | |||||||||||||||||||||||||
Expense Ratio, Percent | 0.30% | |||||||||||||||||||||||||
Factors Affecting Performance [Text Block] | Management's Discussion of Fund Performance The performance of Institutional 3 Class shares for the period presented is shown in the Average Annual Total Returns table. Top Performance Contributors Credit quality selection | Positive contributions to benchmark-relative performance were driven by selection in bonds rated single-A and higher.Sector allocation | Overweights to housing, industrial development revenue/pollution control revenue (IDR/PCR) and continuing care retirement community (CCRC) bonds were positive contributors to the Fund’s performance relative to its benchmark.Sector security selection | Strong security selection in education, utilities, special tax, local general obligation (GO) and airport bonds contributed to the Fund’s performance relative to its benchmark. The general profile of the local GO exposure, shorter in duration and maturity, drove its strong performance.Credit quality allocation | Credit quality allocation added to the fund’s relative performance. Overweights to higher yielding nonrated, BBB and single-A rated bonds and an underweight to AA bonds added to performance during a period in which investors favored the income generated by higher yielding bonds.Top Performance Detractors Yield curve positioning | The fund’s modest overweight to longer maturity bonds (5 years and longer) detracted from performance, relative to its benchmark, as municipal market interest rates rose in this portion of the curve.Sector security selection | Security selection was positive. However, selection in CCRC, IDR/PCR and housing bonds were modest detractors.Sector allocation | While sector allocation was broadly positive, an underweight to pre-pay gas bonds was a modest detractor. |
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Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |||||||||||||||||||||||||
Line Graph [Table Text Block] | ![]() |
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Average Annual Return [Table Text Block] |
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No Deduction of Taxes [Text Block] | Performance does not reflect the deduction of taxes that a shareholder may pay on fund distributions or on the redemptions of fund shares. | |||||||||||||||||||||||||
Performance Table Market Index Changed [Text Block] | Effective August 1, 2024, the Fund compares its performance to the Bloomberg Municipal Bond Index, a broad-based performance index that meets new regulatory requirements. | |||||||||||||||||||||||||
Prior Market Index Comparison [Text Block] | The Fund’s performance is also compared to its prior benchmark, which more closely represents the market sectors and/or asset classes in which the Fund primarily invests. | |||||||||||||||||||||||||
Previous Investment Adviser [Text Block] | The Fund’s performance prior to September 1, 2022 reflects returns achieved according to different principal investment strategies. If the Fund's current strategies had been in place for the prior periods, results shown may have been different. | |||||||||||||||||||||||||
Updated Performance Information Location [Text Block] | Visit columbiathreadneedleus.com/investment-products/mutual-funds for more recent performance information.
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Net Assets | $ 294,298,942 | |||||||||||||||||||||||||
Holdings Count | Holding | 175 | |||||||||||||||||||||||||
Advisory Fees Paid, Amount | $ 1,327,636 | |||||||||||||||||||||||||
Investment Company, Portfolio Turnover | 32.00% | |||||||||||||||||||||||||
Additional Fund Statistics [Text Block] | Key Fund Statistics
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Holdings [Text Block] | Graphical Representation of Fund The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change. Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily. Top States/Territories
Asset Categories ![]() Credit Quality ![]() |
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Credit Quality Explanation [Text Block] | Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily. | |||||||||||||||||||||||||
Largest Holdings [Text Block] | Top States/Territories
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Material Fund Change [Text Block] | Certain Fund Changes This is a summary of certain changes to the Fund during the reporting period. For more complete information, you may review the Fund’s prospectus, which is available at columbiathreadneedleus.com/resources/literature or upon request at 1-800-345-6611 .Effective August 1, 2024, the Fund amended its Prospectus’ Principal Investment Strategies to reflect that the Fund may enter into tender option bond (TOB) transactions and may invest in derivatives, such as floating rate municipal securities (floaters) and inverse floating rate municipal securities (inverse floaters) to add incremental income, futures (including interest rate and Treasury bond futures) to manage duration and hedge against changes in interest rates, and swaps, including Municipal Market Data Rate Locks (MMD Rate Locks) to manage duration and hedge against changes in interest rates. In addition, the Fund amended its Prospectus’ Principal Risks to include disclosure of the risks associated with investing in these instruments and derivatives generally.
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Material Fund Change Strategies [Text Block] | Effective August 1, 2024, the Fund amended its Prospectus’ Principal Investment Strategies to reflect that the Fund may enter into tender option bond (TOB) transactions and may invest in derivatives, such as floating rate municipal securities (floaters) and inverse floating rate municipal securities (inverse floaters) to add incremental income, futures (including interest rate and Treasury bond futures) to manage duration and hedge against changes in interest rates, and swaps, including Municipal Market Data Rate Locks (MMD Rate Locks) to manage duration and hedge against changes in interest rates. | |||||||||||||||||||||||||
Material Fund Change Risks Change [Text Block] | In addition, the Fund amended its Prospectus’ Principal Risks to include disclosure of the risks associated with investing in these instruments and derivatives generally. | |||||||||||||||||||||||||
Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund during the reporting period. For more complete information, you may review the Fund’s prospectus, which is available at columbiathreadneedleus.com/resources/literature or upon request at 1-800-345-6611 .
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Updated Prospectus Phone Number | 1-800-345-6611 | |||||||||||||||||||||||||
Updated Prospectus Web Address | columbiathreadneedleus.com/resources/literature | |||||||||||||||||||||||||
Columbia Short Duration Municipal Bond Fund - Class S | ||||||||||||||||||||||||||
Shareholder Report [Line Items] | ||||||||||||||||||||||||||
Fund Name | Columbia Short Duration Municipal Bond Fund | |||||||||||||||||||||||||
Class Name | Class S | |||||||||||||||||||||||||
Trading Symbol | NSMDX | |||||||||||||||||||||||||
Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Columbia Short Duration Municipal Bond Fund (the Fund) for the period of October 2, 2024 to April 30, 2025. | |||||||||||||||||||||||||
Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||
Additional Information [Text Block] | You can find additional information about the Fund at columbiathreadneedleus.com/resources/literature . You can also request more information by contacting us at 1-800-345-6611.
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Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||||||||||||||||||||||||
Additional Information Phone Number | 1-800-345-6611 | |||||||||||||||||||||||||
Additional Information Website | columbiathreadneedleus.com/resources/literature | |||||||||||||||||||||||||
Expenses [Text Block] | What were the Fund costs for the reporting period? (Based on a hypothetical $10,000 investment)
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Expenses Paid, Amount | $ 22 | [1] | ||||||||||||||||||||||||
Expense Ratio, Percent | 0.39% | [2] | ||||||||||||||||||||||||
Factors Affecting Performance [Text Block] | Management's Discussion of Fund Performance The performance of Class S shares for the period presented is shown in the Average Annual Total Returns table. Top Performance Contributors Credit quality selection | Positive contributions to benchmark-relative performance were driven by selection in bonds rated single-A and higher.Sector allocation | Overweights to housing, industrial development revenue/pollution control revenue (IDR/PCR) and continuing care retirement community (CCRC) bonds were positive contributors to the Fund’s performance relative to its benchmark.Sector security selection | Strong security selection in education, utilities, special tax, local general obligation (GO) and airport bonds contributed to the Fund’s performance relative to its benchmark. The general profile of the local GO exposure, shorter in duration and maturity, drove its strong performance.Credit quality allocation | Credit quality allocation added to the fund’s relative performance. Overweights to higher yielding nonrated, BBB and single-A rated bonds and an underweight to AA bonds added to performance during a period in which investors favored the income generated by higher yielding bonds.Top Performance Detractors Yield curve positioning | The fund’s modest overweight to longer maturity bonds (5 years and longer) detracted from performance, relative to its benchmark, as municipal market interest rates rose in this portion of the curve.Sector security selection | Security selection was positive. However, selection in CCRC, IDR/PCR and housing bonds were modest detractors.Sector allocation | While sector allocation was broadly positive, an underweight to pre-pay gas bonds was a modest detractor. |
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Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance. | |||||||||||||||||||||||||
Line Graph [Table Text Block] | ![]() |
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Average Annual Return [Table Text Block] |
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No Deduction of Taxes [Text Block] | Performance does not reflect the deduction of taxes that a shareholder may pay on fund distributions or on the redemptions of fund shares. | |||||||||||||||||||||||||
Performance Table Market Index Changed [Text Block] | Effective August 1, 2024, the Fund compares its performance to the Bloomberg Municipal Bond Index, a broad-based performance index that meets new regulatory requirements. | |||||||||||||||||||||||||
Prior Market Index Comparison [Text Block] | The Fund’s performance is also compared to its prior benchmark, which more closely represents the market sectors and/or asset classes in which the Fund primarily invests. | |||||||||||||||||||||||||
Previous Investment Adviser [Text Block] | The Fund’s performance prior to September 1, 2022 reflects returns achieved according to different principal investment strategies. If the Fund's current strategies had been in place for the prior periods, results shown may have been different. | |||||||||||||||||||||||||
Updated Performance Information Location [Text Block] | Visit columbiathreadneedleus.com/investment-products/mutual-funds for more recent performance information.
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Net Assets | $ 294,298,942 | |||||||||||||||||||||||||
Holdings Count | Holding | 175 | |||||||||||||||||||||||||
Advisory Fees Paid, Amount | $ 1,327,636 | |||||||||||||||||||||||||
Investment Company, Portfolio Turnover | 32.00% | |||||||||||||||||||||||||
Additional Fund Statistics [Text Block] | Key Fund Statistics
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Holdings [Text Block] | Graphical Representation of Fund The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change. Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily. Top States/Territories
Asset Categories ![]() Credit Quality ![]() |
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Credit Quality Explanation [Text Block] | Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily. | |||||||||||||||||||||||||
Largest Holdings [Text Block] | Top States/Territories
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Material Fund Change [Text Block] | Certain Fund Changes This is a summary of certain changes to the Fund during the reporting period. For more complete information, you may review the Fund’s prospectus, which is available at columbiathreadneedleus.com/resources/literature or upon request at 1-800-345-6611 .Effective August 1, 2024, the Fund amended its Prospectus’ Principal Investment Strategies to reflect that the Fund may enter into tender option bond (TOB) transactions and may invest in derivatives, such as floating rate municipal securities (floaters) and inverse floating rate municipal securities (inverse floaters) to add incremental income, futures (including interest rate and Treasury bond futures) to manage duration and hedge against changes in interest rates, and swaps, including Municipal Market Data Rate Locks (MMD Rate Locks) to manage duration and hedge against changes in interest rates. In addition, the Fund amended its Prospectus’ Principal Risks to include disclosure of the risks associated with investing in these instruments and derivatives generally.
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Material Fund Change Strategies [Text Block] | Effective August 1, 2024, the Fund amended its Prospectus’ Principal Investment Strategies to reflect that the Fund may enter into tender option bond (TOB) transactions and may invest in derivatives, such as floating rate municipal securities (floaters) and inverse floating rate municipal securities (inverse floaters) to add incremental income, futures (including interest rate and Treasury bond futures) to manage duration and hedge against changes in interest rates, and swaps, including Municipal Market Data Rate Locks (MMD Rate Locks) to manage duration and hedge against changes in interest rates. | |||||||||||||||||||||||||
Material Fund Change Risks Change [Text Block] | In addition, the Fund amended its Prospectus’ Principal Risks to include disclosure of the risks associated with investing in these instruments and derivatives generally. | |||||||||||||||||||||||||
Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund during the reporting period. For more complete information, you may review the Fund’s prospectus, which is available at columbiathreadneedleus.com/resources/literature or upon request at 1-800-345-6611 .
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Updated Prospectus Phone Number | 1-800-345-6611 | |||||||||||||||||||||||||
Updated Prospectus Web Address | columbiathreadneedleus.com/resources/literature | |||||||||||||||||||||||||
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