v3.25.2
Shareholder Report
 12 Months Ended
Apr. 30, 2025
USD ($)
Holding
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.
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)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Class A
$
73		0.73
%
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.
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] Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (%)1 year5 years10 years
Class A (excluding sales charges)1.081.001.52
Class A (including sales charges)(1.94
)
0.391.21
Bloomberg California 3-15 Year Blend Municipal Bond Index1.501.031.88
Bloomberg Municipal Bond
Index
(a)
1.661.172.10
(a)
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. 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.
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.
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
Fund net assets
$
292,380,359
Total number of portfolio holdings219
Management services fees
(represents 0.47% of Fund average net assets)
$
1,409,905
Portfolio turnover for the reporting period16%
Holdings [Text Block]
Graphical Representation of Fund
 
Holdings
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
Southern California Public Power Authority
04/01/2055 5.000%		2.1
%
Los Angeles Department of Water & Power
07/01/2041 5.000%		2.1
%
California State Public Works Board
08/01/2036 5.000%		1.9
%
Burbank-Glendale-Pasadena Airport Authority Brick Campaign
07/01/2044 5.250%		1.8
%
State of California
08/01/2044 5.250%		1.5
%
California State University
11/01/2042 5.000%		1.5
%
Los Angeles Unified School District
07/01/2032 5.000%		1.4
%
Golden State Tobacco Securitization Corp.
06/01/2033 5.000%		1.4
%
Foothill-Eastern Transportation Corridor Agency
01/15/2033 0.000%		1.3
%
Southern California Public Power Authority
07/01/2041 5.000%		1.3
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Credit Quality
Graphical Representation - Allocation 2 Chart
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
Southern California Public Power Authority
04/01/2055 5.000%		2.1
%
Los Angeles Department of Water & Power
07/01/2041 5.000%		2.1
%
California State Public Works Board
08/01/2036 5.000%		1.9
%
Burbank-Glendale-Pasadena Airport Authority Brick Campaign
07/01/2044 5.250%		1.8
%
State of California
08/01/2044 5.250%		1.5
%
California State University
11/01/2042 5.000%		1.5
%
Los Angeles Unified School District
07/01/2032 5.000%		1.4
%
Golden State Tobacco Securitization Corp.
06/01/2033 5.000%		1.4
%
Foothill-Eastern Transportation Corridor Agency
01/15/2033 0.000%		1.3
%
Southern California Public Power Authority
07/01/2041 5.000%		1.3
%
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.
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
.
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.
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)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Institutional Class
$
48		0.48
%
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.
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] Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (%)1 year5 years10 years
Institutional Class1.22 1.27 1.78
Bloomberg California 3-15 Year Blend Municipal Bond Index1.501.031.88
Bloomberg Municipal Bond
Index
(a)
1.661.172.10
(a)
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. 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.
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.
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]
Fund net assets
$
292,380,359
Total number of portfolio holdings219
Management services fees
(represents 0.47% of Fund average net assets)
$
1,409,905
Portfolio turnover for the reporting period16%
Holdings [Text Block]
Graphical Representation of Fund
 
Holdings
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
Southern California Public Power Authority
04/01/2055 5.000%		2.1
%
Los Angeles Department of Water & Power
07/01/2041 5.000%		2.1
%
California State Public Works Board
08/01/2036 5.000%		1.9
%
Burbank-Glendale-Pasadena Airport Authority Brick Campaign
07/01/2044 5.250%		1.8
%
State of California
08/01/2044 5.250%		1.5
%
California State University
11/01/2042 5.000%		1.5
%
Los Angeles Unified School District
07/01/2032 5.000%		1.4
%
Golden State Tobacco Securitization Corp.
06/01/2033 5.000%		1.4
%
Foothill-Eastern Transportation Corridor Agency
01/15/2033 0.000%		1.3
%
Southern California Public Power Authority
07/01/2041 5.000%		1.3
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Credit Quality
Graphical Representation - Allocation 2 Chart
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
Southern California Public Power Authority
04/01/2055 5.000%		2.1
%
Los Angeles Department of Water & Power
07/01/2041 5.000%		2.1
%
California State Public Works Board
08/01/2036 5.000%		1.9
%
Burbank-Glendale-Pasadena Airport Authority Brick Campaign
07/01/2044 5.250%		1.8
%
State of California
08/01/2044 5.250%		1.5
%
California State University
11/01/2042 5.000%		1.5
%
Los Angeles Unified School District
07/01/2032 5.000%		1.4
%
Golden State Tobacco Securitization Corp.
06/01/2033 5.000%		1.4
%
Foothill-Eastern Transportation Corridor Agency
01/15/2033 0.000%		1.3
%
Southern California Public Power Authority
07/01/2041 5.000%		1.3
%
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.
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
.
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.
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)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Institutional 2 Class
$
47		0.47
%
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.
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] Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (%)1 year5 years10 years
Institutional 2 Class1.23 1.28 1.82
Bloomberg California 3-15 Year Blend Municipal Bond Index1.501.031.88
Bloomberg Municipal Bond
Index
(a)
1.661.172.10
(a)
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. 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.
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.
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]
Fund net assets
$
292,380,359
Total number of portfolio holdings219
Management services fees
(represents 0.47% of Fund average net assets)
$
1,409,905
Portfolio turnover for the reporting period16%
Holdings [Text Block]
Graphical Representation of Fund
 
Holdings
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
Southern California Public Power Authority
04/01/2055 5.000%		2.1
%
Los Angeles Department of Water & Power
07/01/2041 5.000%		2.1
%
California State Public Works Board
08/01/2036 5.000%		1.9
%
Burbank-Glendale-Pasadena Airport Authority Brick Campaign
07/01/2044 5.250%		1.8
%
State of California
08/01/2044 5.250%		1.5
%
California State University
11/01/2042 5.000%		1.5
%
Los Angeles Unified School District
07/01/2032 5.000%		1.4
%
Golden State Tobacco Securitization Corp.
06/01/2033 5.000%		1.4
%
Foothill-Eastern Transportation Corridor Agency
01/15/2033 0.000%		1.3
%
Southern California Public Power Authority
07/01/2041 5.000%		1.3
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Credit Quality
Graphical Representation - Allocation 2 Chart
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
Southern California Public Power Authority
04/01/2055 5.000%		2.1
%
Los Angeles Department of Water & Power
07/01/2041 5.000%		2.1
%
California State Public Works Board
08/01/2036 5.000%		1.9
%
Burbank-Glendale-Pasadena Airport Authority Brick Campaign
07/01/2044 5.250%		1.8
%
State of California
08/01/2044 5.250%		1.5
%
California State University
11/01/2042 5.000%		1.5
%
Los Angeles Unified School District
07/01/2032 5.000%		1.4
%
Golden State Tobacco Securitization Corp.
06/01/2033 5.000%		1.4
%
Foothill-Eastern Transportation Corridor Agency
01/15/2033 0.000%		1.3
%
Southern California Public Power Authority
07/01/2041 5.000%		1.3
%
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.
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
.
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.
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)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Institutional 3 Class
$
42		0.42
%
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.
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] Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (%)1 year5 years10 years
Institutional 3
Class
(a)
1.281.331.85
Bloomberg California 3-15 Year Blend Municipal Bond Index1.501.031.88
Bloomberg Municipal Bond
Index
(b)
1.661.172.10
(a)
The returns shown for periods prior to March 1, 2017 (including Since Fund Inception returns, if shown) include the returns of Institutional Class. These returns are adjusted to reflect any higher class-related operating expenses of the newer share classes, as applicable. Please visit
columbiathreadneedleus.com/investment-products/mutual-funds/appended-performance
for more information.
(b)
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. 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.
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.
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]
Fund net assets
$
292,380,359
Total number of portfolio holdings219
Management services fees
(represents 0.47% of Fund average net assets)
$
1,409,905
Portfolio turnover for the reporting period16%
Holdings [Text Block]
Graphical Representation of Fund
 
Holdings
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
Southern California Public Power Authority
04/01/2055 5.000%		2.1
%
Los Angeles Department of Water & Power
07/01/2041 5.000%		2.1
%
California State Public Works Board
08/01/2036 5.000%		1.9
%
Burbank-Glendale-Pasadena Airport Authority Brick Campaign
07/01/2044 5.250%		1.8
%
State of California
08/01/2044 5.250%		1.5
%
California State University
11/01/2042 5.000%		1.5
%
Los Angeles Unified School District
07/01/2032 5.000%		1.4
%
Golden State Tobacco Securitization Corp.
06/01/2033 5.000%		1.4
%
Foothill-Eastern Transportation Corridor Agency
01/15/2033 0.000%		1.3
%
Southern California Public Power Authority
07/01/2041 5.000%		1.3
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Credit Quality
Graphical Representation - Allocation 2 Chart
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
Southern California Public Power Authority
04/01/2055 5.000%		2.1
%
Los Angeles Department of Water & Power
07/01/2041 5.000%		2.1
%
California State Public Works Board
08/01/2036 5.000%		1.9
%
Burbank-Glendale-Pasadena Airport Authority Brick Campaign
07/01/2044 5.250%		1.8
%
State of California
08/01/2044 5.250%		1.5
%
California State University
11/01/2042 5.000%		1.5
%
Los Angeles Unified School District
07/01/2032 5.000%		1.4
%
Golden State Tobacco Securitization Corp.
06/01/2033 5.000%		1.4
%
Foothill-Eastern Transportation Corridor Agency
01/15/2033 0.000%		1.3
%
Southern California Public Power Authority
07/01/2041 5.000%		1.3
%
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.
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
.
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.
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)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Class S
$
27
(a)
0.48
%
(b)
(a)
Based on operations from October 2, 2024 (commencement of operations) through the stated period end. Had the class been open for the entire reporting period, expenses shown in the table above would have been higher.
(b)
Annualized.
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.
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] Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (%)1 year5 years10 years
Class
S
(a)
1.221.271.78
Bloomberg California 3-15 Year Blend Municipal Bond Index1.501.031.88
Bloomberg Municipal Bond
Index
(b)
1.661.172.10
(a)
The returns shown for periods prior to October 2, 2024 (including Since Fund Inception returns, if shown) include the returns of Institutional Class. These returns are adjusted to reflect any higher class-related operating expenses of the newer share classes, as applicable. Please visit
columbiathreadneedleus.com/investment-products/mutual-funds/appended-performance
for more information.
(b)
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. 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.
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.
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]
Fund net assets
$
292,380,359
Total number of portfolio holdings219
Management services fees
(represents 0.47% of Fund average net assets)
$
1,409,905
Portfolio turnover for the reporting period16%
Holdings [Text Block]
Graphical Representation of Fund
 
Holdings
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
Southern California Public Power Authority
04/01/2055 5.000%		2.1
%
Los Angeles Department of Water & Power
07/01/2041 5.000%		2.1
%
California State Public Works Board
08/01/2036 5.000%		1.9
%
Burbank-Glendale-Pasadena Airport Authority Brick Campaign
07/01/2044 5.250%		1.8
%
State of California
08/01/2044 5.250%		1.5
%
California State University
11/01/2042 5.000%		1.5
%
Los Angeles Unified School District
07/01/2032 5.000%		1.4
%
Golden State Tobacco Securitization Corp.
06/01/2033 5.000%		1.4
%
Foothill-Eastern Transportation Corridor Agency
01/15/2033 0.000%		1.3
%
Southern California Public Power Authority
07/01/2041 5.000%		1.3
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Credit Quality
Graphical Representation - Allocation 2 Chart
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
Southern California Public Power Authority
04/01/2055 5.000%		2.1
%
Los Angeles Department of Water & Power
07/01/2041 5.000%		2.1
%
California State Public Works Board
08/01/2036 5.000%		1.9
%
Burbank-Glendale-Pasadena Airport Authority Brick Campaign
07/01/2044 5.250%		1.8
%
State of California
08/01/2044 5.250%		1.5
%
California State University
11/01/2042 5.000%		1.5
%
Los Angeles Unified School District
07/01/2032 5.000%		1.4
%
Golden State Tobacco Securitization Corp.
06/01/2033 5.000%		1.4
%
Foothill-Eastern Transportation Corridor Agency
01/15/2033 0.000%		1.3
%
Southern California Public Power Authority
07/01/2041 5.000%		1.3
%
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.
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
.
Updated Prospectus Phone Number 1-800-345-6611
Updated Prospectus Web Address columbiathreadneedleus.com/resources/literature
[1] Based on operations from October 2, 2024 (commencement of operations) through the stated period end. Had the class been open for the entire reporting period, expenses shown in the table above would have been higher.
[2] Annualized.