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 California Intermediate Municipal Bond Fund - Class A | ||||||||||||||||||||||||
Shareholder Report [Line Items] | ||||||||||||||||||||||||
Fund Name | Columbia California Intermediate Municipal Bond Fund | |||||||||||||||||||||||
Class Name | Class A | |||||||||||||||||||||||
Trading Symbol | NACMX | |||||||||||||||||||||||
Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Columbia California Intermediate 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 | $ 73 | |||||||||||||||||||||||
Expense Ratio, Percent | 0.73% | |||||||||||||||||||||||
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 Security selection | Strong security selection in education, airport, local general obligation (GO) and special tax bonds contributed to Fund performance relative to the benchmark.Credit quality allocation | Credit quality allocation added to the Fund’s relative performance. Overweights to higher yielding, lower rated A, BBB and non-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.Credit quality selection | Positive contributions to benchmark-relative performance were driven by security selection in bonds rated AA.Yield curve allocation | Shorter maturities outperformed longer maturities, with the strongest index returns coming from the 2-4-year range. The portfolio maintained its barbell profile with heavier exposures on the short and long ends. Exposure to the shorter portion (0-2 years) of the barbell produced the strongest returns, topping all maturity buckets in the index.Top Performance Detractors Interest rate positioning | The Fund’s modest underweight to the shortest maturities within the benchmark (2-to-3 years) detracted from relative performance as municipal market interest rates declined in this portion of the curve. An overweight position to the long end of the curve detracted from relative performance, as market rates in this space moved markedly higher.Sector allocations | Underweight positions in pre-paid gas and state general obligation (GO) bonds detracted from relative performance.Credit quality selection | Security selection in BBB and single-A rated bonds detracted from relative performance, with selection in BBB rated charter schools and 10-year single-A airport bonds, and the timing of prepay natural gas bonds notable detractors.Security Selection | Selection in single-A rated Los Angeles Department of Water and Power bonds, which were impacted by the fires in early 2025, detracted from relative performance. |
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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, as required by new regulatory requirements. | |||||||||||||||||||||||
Prior Market Index Comparison [Text Block] | The Fund’s performance also continues to be compared to its prior benchmarks, which management believes more closely represent the market sectors/and or asset classes in which the Fund primarily invests. | |||||||||||||||||||||||
Updated Performance Information Location [Text Block] | Visit columbiathreadneedleus.com/investment-products/mutual-funds for more recent performance information.
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Net Assets | $ 292,380,359 | |||||||||||||||||||||||
Holdings Count | Holding | 219 | |||||||||||||||||||||||
Advisory Fees Paid, Amount | $ 1,409,905 | |||||||||||||||||||||||
Investment Company, Portfolio Turnover | 16.00% | |||||||||||||||||||||||
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 Holdings
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 Holdings
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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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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 California Intermediate Municipal Bond Fund - Institutional Class | ||||||||||||||||||||||||
Shareholder Report [Line Items] | ||||||||||||||||||||||||
Fund Name | Columbia California Intermediate Municipal Bond Fund | |||||||||||||||||||||||
Class Name | Institutional Class | |||||||||||||||||||||||
Trading Symbol | NCMAX | |||||||||||||||||||||||
Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Columbia California Intermediate 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 | $ 48 | |||||||||||||||||||||||
Expense Ratio, Percent | 0.48% | |||||||||||||||||||||||
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 Security selection | Strong security selection in education, airport, local general obligation (GO) and special tax bonds contributed to Fund performance relative to the benchmark.Credit quality allocation | Credit quality allocation added to the Fund’s relative performance. Overweights to higher yielding, lower rated A, BBB and non-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.Credit quality selection | Positive contributions to benchmark-relative performance were driven by security selection in bonds rated AA.Yield curve allocation | Shorter maturities outperformed longer maturities, with the strongest index returns coming from the 2-4-year range. The portfolio maintained its barbell profile with heavier exposures on the short and long ends. Exposure to the shorter portion (0-2 years) of the barbell produced the strongest returns, topping all maturity buckets in the index.Top Performance Detractors Interest rate positioning | The Fund’s modest underweight to the shortest maturities within the benchmark (2-to-3 years) detracted from relative performance as municipal market interest rates declined in this portion of the curve. An overweight position to the long end of the curve detracted from relative performance, as market rates in this space moved markedly higher.Sector allocations | Underweight positions in pre-paid gas and state general obligation (GO) bonds detracted from relative performance.Credit quality selection | Security selection in BBB and single-A rated bonds detracted from relative performance, with selection in BBB rated charter schools and 10-year single-A airport bonds, and the timing of prepay natural gas bonds notable detractors.Security Selection | Selection in single-A rated Los Angeles Department of Water and Power bonds, which were impacted by the fires in early 2025, detracted from relative performance. |
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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, as required by new regulatory requirements. | |||||||||||||||||||||||
Prior Market Index Comparison [Text Block] | The Fund’s performance also continues to be compared to its prior benchmarks, which management believes more closely represent the market sectors/and or asset classes in which the Fund primarily invests. | |||||||||||||||||||||||
Updated Performance Information Location [Text Block] | Visit columbiathreadneedleus.com/investment-products/mutual-funds for more recent performance information.
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Net Assets | $ 292,380,359 | |||||||||||||||||||||||
Holdings Count | Holding | 219 | |||||||||||||||||||||||
Advisory Fees Paid, Amount | $ 1,409,905 | |||||||||||||||||||||||
Investment Company, Portfolio Turnover | 16.00% | |||||||||||||||||||||||
Additional Fund Statistics [Text Block] |
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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 Holdings
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 Holdings
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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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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 California Intermediate Municipal Bond Fund - Institutional 2 Class | ||||||||||||||||||||||||
Shareholder Report [Line Items] | ||||||||||||||||||||||||
Fund Name | Columbia California Intermediate Municipal Bond Fund | |||||||||||||||||||||||
Class Name | Institutional 2 Class | |||||||||||||||||||||||
Trading Symbol | CNBRX | |||||||||||||||||||||||
Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Columbia California Intermediate 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 | $ 47 | |||||||||||||||||||||||
Expense Ratio, Percent | 0.47% | |||||||||||||||||||||||
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 Security selection | Strong security selection in education, airport, local general obligation (GO) and special tax bonds contributed to Fund performance relative to the benchmark.Credit quality allocation | Credit quality allocation added to the Fund’s relative performance. Overweights to higher yielding, lower rated A, BBB and non-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.Credit quality selection | Positive contributions to benchmark-relative performance were driven by security selection in bonds rated AA.Yield curve allocation | Shorter maturities outperformed longer maturities, with the strongest index returns coming from the 2-4-year range. The portfolio maintained its barbell profile with heavier exposures on the short and long ends. Exposure to the shorter portion (0-2 years) of the barbell produced the strongest returns, topping all maturity buckets in the index.Top Performance Detractors Interest rate positioning | The Fund’s modest underweight to the shortest maturities within the benchmark (2-to-3 years) detracted from relative performance as municipal market interest rates declined in this portion of the curve. An overweight position to the long end of the curve detracted from relative performance, as market rates in this space moved markedly higher.Sector allocations | Underweight positions in pre-paid gas and state general obligation (GO) bonds detracted from relative performance.Credit quality selection | Security selection in BBB and single-A rated bonds detracted from relative performance, with selection in BBB rated charter schools and 10-year single-A airport bonds, and the timing of prepay natural gas bonds notable detractors.Security Selection | Selection in single-A rated Los Angeles Department of Water and Power bonds, which were impacted by the fires in early 2025, detracted from relative performance. |
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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, as required by new regulatory requirements. | |||||||||||||||||||||||
Prior Market Index Comparison [Text Block] | The Fund’s performance also continues to be compared to its prior benchmarks, which management believes more closely represent the market sectors/and or asset classes in which the Fund primarily invests. | |||||||||||||||||||||||
Updated Performance Information Location [Text Block] | Visit columbiathreadneedleus.com/investment-products/mutual-funds for more recent performance information.
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Net Assets | $ 292,380,359 | |||||||||||||||||||||||
Holdings Count | Holding | 219 | |||||||||||||||||||||||
Advisory Fees Paid, Amount | $ 1,409,905 | |||||||||||||||||||||||
Investment Company, Portfolio Turnover | 16.00% | |||||||||||||||||||||||
Additional Fund Statistics [Text Block] |
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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 Holdings
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 Holdings
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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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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 California Intermediate Municipal Bond Fund - Institutional 3 Class | ||||||||||||||||||||||||
Shareholder Report [Line Items] | ||||||||||||||||||||||||
Fund Name | Columbia California Intermediate Municipal Bond Fund | |||||||||||||||||||||||
Class Name | Institutional 3 Class | |||||||||||||||||||||||
Trading Symbol | CCBYX | |||||||||||||||||||||||
Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Columbia California Intermediate 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 | $ 42 | |||||||||||||||||||||||
Expense Ratio, Percent | 0.42% | |||||||||||||||||||||||
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 Security selection | Strong security selection in education, airport, local general obligation (GO) and special tax bonds contributed to Fund performance relative to the benchmark.Credit quality allocation | Credit quality allocation added to the Fund’s relative performance. Overweights to higher yielding, lower rated A, BBB and non-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.Credit quality selection | Positive contributions to benchmark-relative performance were driven by security selection in bonds rated AA.Yield curve allocation | Shorter maturities outperformed longer maturities, with the strongest index returns coming from the 2-4-year range. The portfolio maintained its barbell profile with heavier exposures on the short and long ends. Exposure to the shorter portion (0-2 years) of the barbell produced the strongest returns, topping all maturity buckets in the index.Top Performance Detractors Interest rate positioning | The Fund’s modest underweight to the shortest maturities within the benchmark (2-to-3 years) detracted from relative performance as municipal market interest rates declined in this portion of the curve. An overweight position to the long end of the curve detracted from relative performance, as market rates in this space moved markedly higher.Sector allocations | Underweight positions in pre-paid gas and state general obligation (GO) bonds detracted from relative performance.Credit quality selection | Security selection in BBB and single-A rated bonds detracted from relative performance, with selection in BBB rated charter schools and 10-year single-A airport bonds, and the timing of prepay natural gas bonds notable detractors.Security Selection | Selection in single-A rated Los Angeles Department of Water and Power bonds, which were impacted by the fires in early 2025, detracted from relative performance. |
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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, as required by new regulatory requirements. | |||||||||||||||||||||||
Prior Market Index Comparison [Text Block] | The Fund’s performance also continues to be compared to its prior benchmarks, which management believes more closely represent the market sectors/and or asset classes in which the Fund primarily invests. | |||||||||||||||||||||||
Updated Performance Information Location [Text Block] | Visit columbiathreadneedleus.com/investment-products/mutual-funds for more recent performance information.
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Net Assets | $ 292,380,359 | |||||||||||||||||||||||
Holdings Count | Holding | 219 | |||||||||||||||||||||||
Advisory Fees Paid, Amount | $ 1,409,905 | |||||||||||||||||||||||
Investment Company, Portfolio Turnover | 16.00% | |||||||||||||||||||||||
Additional Fund Statistics [Text Block] |
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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 Holdings
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 Holdings
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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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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 California Intermediate Municipal Bond Fund - Class S | ||||||||||||||||||||||||
Shareholder Report [Line Items] | ||||||||||||||||||||||||
Fund Name | Columbia California Intermediate Municipal Bond Fund | |||||||||||||||||||||||
Class Name | Class S | |||||||||||||||||||||||
Trading Symbol | NCMDX | |||||||||||||||||||||||
Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Columbia California Intermediate 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 | $ 27 | [1] | ||||||||||||||||||||||
Expense Ratio, Percent | 0.48% | [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 Security selection | Strong security selection in education, airport, local general obligation (GO) and special tax bonds contributed to Fund performance relative to the benchmark.Credit quality allocation | Credit quality allocation added to the Fund’s relative performance. Overweights to higher yielding, lower rated A, BBB and non-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.Credit quality selection | Positive contributions to benchmark-relative performance were driven by security selection in bonds rated AA.Yield curve allocation | Shorter maturities outperformed longer maturities, with the strongest index returns coming from the 2-4-year range. The portfolio maintained its barbell profile with heavier exposures on the short and long ends. Exposure to the shorter portion (0-2 years) of the barbell produced the strongest returns, topping all maturity buckets in the index.Top Performance Detractors Interest rate positioning | The Fund’s modest underweight to the shortest maturities within the benchmark (2-to-3 years) detracted from relative performance as municipal market interest rates declined in this portion of the curve. An overweight position to the long end of the curve detracted from relative performance, as market rates in this space moved markedly higher.Sector allocations | Underweight positions in pre-paid gas and state general obligation (GO) bonds detracted from relative performance.Credit quality selection | Security selection in BBB and single-A rated bonds detracted from relative performance, with selection in BBB rated charter schools and 10-year single-A airport bonds, and the timing of prepay natural gas bonds notable detractors.Security Selection | Selection in single-A rated Los Angeles Department of Water and Power bonds, which were impacted by the fires in early 2025, detracted from relative performance. |
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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, as required by new regulatory requirements. | |||||||||||||||||||||||
Prior Market Index Comparison [Text Block] | The Fund’s performance also continues to be compared to its prior benchmarks, which management believes more closely represent the market sectors/and or asset classes in which the Fund primarily invests. | |||||||||||||||||||||||
Updated Performance Information Location [Text Block] | Visit columbiathreadneedleus.com/investment-products/mutual-funds for more recent performance information.
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Net Assets | $ 292,380,359 | |||||||||||||||||||||||
Holdings Count | Holding | 219 | |||||||||||||||||||||||
Advisory Fees Paid, Amount | $ 1,409,905 | |||||||||||||||||||||||
Investment Company, Portfolio Turnover | 16.00% | |||||||||||||||||||||||
Additional Fund Statistics [Text Block] |
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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 Holdings
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 Holdings
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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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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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