| Form N-CSR Cover | 12 Months Ended |
| Jul. 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | Columbia Funds Series Trust I |
| Entity Central Index Key | 0000773757 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Jul. 31, 2024 |
| Shareholder Report | 12 Months Ended |
| Jul. 31, 2024 USD ($) Holding | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | Columbia Funds Series Trust I |
| Entity Central Index Key | 0000773757 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Jul. 31, 2024 |
| Columbia Oregon Intermediate Municipal Bond Fund Class A | |
| Shareholder Report [Line Items] | |
| Fund Name | Columbia Oregon Intermediate Municipal Bond Fund |
| Class Name | Class A |
| Trading Symbol | COEAX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Columbia Oregon Intermediate Municipal Bond Fund (the Fund) for the period of August 1, 2023 to July 31, 2024. |
| 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 1-800-345-6611 . |
| 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) Class Cost of a $10,000 investment Cost paid as a percentage of a $10,000 investment Class A $ 0.81 % |
| Expenses Paid, Amount | $ 82 |
| Expense Ratio, Percent | 0.81% |
| 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 Allocations Security selection Top Performance Detractors Allocations Security selection |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future performance. |
| Line Graph [Table Text Block] | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (%) 1 year 5 years 10 years Class A (excluding sales charges) (a) 2.59 0.48 1.48 Class A (including sales charges) (a) (0.52 ) (0.13 ) 1.18 Bloomberg 3-15 Year Blend Municipal Bond Index 3.14 1.17 2.26 Bloomberg Municipal Bond Index 3.74 1.18 2.47 (a) Effective August 1, 2024, the Fund compares its performance to the Bloomberg Municipal Bond Index, a broad-based performance index that meets new regulatory requirements. The Fund’s performance is also compared to its prior benchmark, which more closely represents the market sectors and/or asset classes in which the Fund primarily invests. |
| 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. |
| Material Change Date | Aug. 01, 2024 |
| Updated Performance Information Location [Text Block] | Visit columbiathreadneedleus.com/investment-products/mutual-funds |
| Net Assets | $ 304,334,086 |
| Holdings Count | Holding | 202 |
| Advisory Fees Paid, Amount | $ 1,400,310 |
| Investment Company, Portfolio Turnover | 13% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Fund net assets $ Total number of portfolio holdings 202 Management services fees $ Portfolio turnover for the reporting period 13% |
| 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, 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, S&P and 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 Oregon Health & Science University 2.5 % City of Portland Water System 2.5 % Tri-County Metropolitan Transportation District of Oregon 2.4 % Oregon Health & Science University 1.9 % State of Oregon Department of Transportation 1.8 % Puerto Rico Public Finance Corp. 1.7 % Port of Portland 1.6 % Washington Clackamas & Yamhill Counties School District No. 88J 1.5 % Port of Portland Airport 1.4 % State of Oregon Department of Transportation 1.4 % Asset Categories Credit Quality |
| 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, 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, S&P and 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 Oregon Health & Science University 2.5 % City of Portland Water System 2.5 % Tri-County Metropolitan Transportation District of Oregon 2.4 % Oregon Health & Science University 1.9 % State of Oregon Department of Transportation 1.8 % Puerto Rico Public Finance Corp. 1.7 % Port of Portland 1.6 % Washington Clackamas & Yamhill Counties School District No. 88J 1.5 % Port of Portland Airport 1.4 % State of Oregon Department of Transportation 1.4 % |
| 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 |
| Material Fund Change Strategies [Text Block] | On July 26, 2024, the Fund supplemented its Prospectus’ Principal Investment Strategies to reflect that the Fund may enter into tender option bond (TOB) transactions and may invest in derivatives, such as floating rate municipal securities (floaters) and inverse floating rate municipal securities (inverse floaters) to add incremental income, futures (including interest rate and Treasury bond futures) to manage duration and hedge against changes in interest rates, and swaps, including Municipal Market Data Rate Locks (MMD Rate Locks) to manage duration and hedge against changes in interest rates. |
| Material Fund Change Risks Change [Text Block] | In addition, the Fund amended its Prospectus’ Principal Risks to include disclosure of the risks associated with investing in these instruments and derivatives generally. |
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund during the reporting period. For more complete information, you may review the Fund’s prospectus, which is available at columbiathreadneedleus.com/resources/literature |
| Updated Prospectus Phone Number | 1-800-345-6611 |
| Updated Prospectus Web Address | columbiathreadneedleus.com/resources/literature |
| Columbia Oregon Intermediate Municipal Bond Fund Advisor Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Columbia Oregon Intermediate Municipal Bond Fund |
| Class Name | Advisor Class |
| Trading Symbol | CORMX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Columbia Oregon Intermediate Municipal Bond Fund (the Fund) for the period of August 1, 2023 to July 31, 2024. |
| 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 1-800-345-6611. |
| 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) Class Cost of a $10,000 investment Cost paid as a percentage of a $10,000 investment Advisor Class $ 0.56 % |
| Expenses Paid, Amount | $ 57 |
| Expense Ratio, Percent | 0.56% |
| Factors Affecting Performance [Text Block] | Management's Discussion of Fund Performance The performance of Advisor Class shares for the period presented is shown in the Average Annual Total Returns table. Top Performance Contributors Allocations Security selection Top Performance Detractors Allocations Security selection |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future performance. |
| Line Graph [Table Text Block] | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (%) 1 year 5 years 10 years Advisor Class (a) 2.93 0.75 1.76 Bloomberg 3-15 Year Blend Municipal Bond Index 3.14 1.17 2.26 Bloomberg Municipal Bond Index 3.74 1.18 2.47 (a) Effective August 1, 2024, the Fund compares its performance to the Bloomberg Municipal Bond Index, a broad-based performance index that meets new regulatory requirements. The Fund’s performance is also compared to its prior benchmark, which more closely represents the market sectors and/or asset classes in which the Fund primarily invests. |
| 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. |
| Material Change Date | Aug. 01, 2024 |
| Updated Performance Information Location [Text Block] | Visit columbiathreadneedleus.com/investment-products/mutual-funds |
| Net Assets | $ 304,334,086 |
| Holdings Count | Holding | 202 |
| Advisory Fees Paid, Amount | $ 1,400,310 |
| Investment Company, Portfolio Turnover | 13% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Fund net assets $ Total number of portfolio holdings 202 Management services fees $ Portfolio turnover for the reporting period 13% |
| 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 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, 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, S&P and 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 Oregon Health & Science University 2.5 % City of Portland Water System 2.5 % Tri-County Metropolitan Transportation District of Oregon 2.4 % Oregon Health & Science University 1.9 % State of Oregon Department of Transportation 1.8 % Puerto Rico Public Finance Corp. 1.7 % Port of Portland 1.6 % Washington Clackamas & Yamhill Counties School District No. 88J 1.5 % Port of Portland Airport 1.4 % State of Oregon Department of Transportation 1.4 % Asset Categories Credit Quality |
| 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, 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, S&P and 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 Oregon Health & Science University 2.5 % City of Portland Water System 2.5 % Tri-County Metropolitan Transportation District of Oregon 2.4 % Oregon Health & Science University 1.9 % State of Oregon Department of Transportation 1.8 % Puerto Rico Public Finance Corp. 1.7 % Port of Portland 1.6 % Washington Clackamas & Yamhill Counties School District No. 88J 1.5 % Port of Portland Airport 1.4 % State of Oregon Department of Transportation 1.4 % |
| 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 |
| Material Fund Change Strategies [Text Block] | On July 26, 2024, the Fund supplemented its Prospectus’ Principal Investment Strategies to reflect that the Fund may enter into tender option bond (TOB) transactions and may invest in derivatives, such as floating rate municipal securities (floaters) and inverse floating rate municipal securities (inverse floaters) to add incremental income, futures (including interest rate and Treasury bond futures) to manage duration and hedge against changes in interest rates, and swaps, including Municipal Market Data Rate Locks (MMD Rate Locks) to manage duration and hedge against changes in interest rates. |
| Material Fund Change Risks Change [Text Block] | In addition, the Fund amended its Prospectus’ Principal Risks to include disclosure of the risks associated with investing in these instruments and derivatives generally. |
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund during the reporting period. For more complete information, you may review the Fund’s prospectus, which is available at columbiathreadneedleus.com/resources/literature |
| Updated Prospectus Phone Number | 1-800-345-6611 |
| Updated Prospectus Web Address | columbiathreadneedleus.com/resources/literature |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Columbia Oregon Intermediate Municipal Bond Fund |
| Class Name | Institutional Class |
| Trading Symbol | CMBFX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Columbia Oregon Intermediate Municipal Bond Fund (the Fund) for the period of August 1, 2023 to July 31, 2024. |
| 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 1-800-345-6611. |
| 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) Class Cost of a $10,000 investment Cost paid as a percentage of a $10,000 investment Institutional Class $ 0.56 % |
| Expenses Paid, Amount | $ 57 |
| Expense Ratio, Percent | 0.56% |
| 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 Allocations Security selection Top Performance Detractors Allocations Security selection |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future performance. |
| Line Graph [Table Text Block] | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (%) 1 year 5 years 10 years Institutional Class (a) 2.84 0.73 1.74 Bloomberg 3-15 Year Blend Municipal Bond Index 3.14 1.17 2.26 Bloomberg Municipal Bond Index 3.74 1.18 2.47 (a) Effective August 1, 2024, the Fund compares its performance to the Bloomberg Municipal Bond Index, a broad-based performance index that meets new regulatory requirements. The Fund’s performance is also compared to its prior benchmark, which more closely represents the market sectors and/or asset classes in which the Fund primarily invests. |
| 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. |
| Material Change Date | Aug. 01, 2024 |
| Updated Performance Information Location [Text Block] | Visit columbiathreadneedleus.com/investment-products/mutual-funds |
| Net Assets | $ 304,334,086 |
| Holdings Count | Holding | 202 |
| Advisory Fees Paid, Amount | $ 1,400,310 |
| Investment Company, Portfolio Turnover | 13% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Fund net assets $ Total number of portfolio holdings 202 Management services fees $ Portfolio turnover for the reporting period 13% |
| 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, 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, S&P and 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 Oregon Health & Science University 2.5 % City of Portland Water System 2.5 % Tri-County Metropolitan Transportation District of Oregon 2.4 % Oregon Health & Science University 1.9 % State of Oregon Department of Transportation 1.8 % Puerto Rico Public Finance Corp. 1.7 % Port of Portland 1.6 % Washington Clackamas & Yamhill Counties School District No. 88J 1.5 % Port of Portland Airport 1.4 % State of Oregon Department of Transportation 1.4 % Asset Categories Credit Quality |
| 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, 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, S&P and 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 Oregon Health & Science University 2.5 % City of Portland Water System 2.5 % Tri-County Metropolitan Transportation District of Oregon 2.4 % Oregon Health & Science University 1.9 % State of Oregon Department of Transportation 1.8 % Puerto Rico Public Finance Corp. 1.7 % Port of Portland 1.6 % Washington Clackamas & Yamhill Counties School District No. 88J 1.5 % Port of Portland Airport 1.4 % State of Oregon Department of Transportation 1.4 % |
| 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 |
| Material Fund Change Strategies [Text Block] | On July 26, 2024, the Fund supplemented its Prospectus’ Principal Investment Strategies to reflect that the Fund may enter into tender option bond (TOB) transactions and may invest in derivatives, such as floating rate municipal securities (floaters) and inverse floating rate municipal securities (inverse floaters) to add incremental income, futures (including interest rate and Treasury bond futures) to manage duration and hedge against changes in interest rates, and swaps, including Municipal Market Data Rate Locks (MMD Rate Locks) to manage duration and hedge against changes in interest rates. |
| Material Fund Change Risks Change [Text Block] | In addition, the Fund amended its Prospectus’ Principal Risks to include disclosure of the risks associated with investing in these instruments and derivatives generally. |
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund during the reporting period. For more complete information, you may review the Fund’s prospectus, which is available at columbiathreadneedleus.com/resources/literature |
| Updated Prospectus Phone Number | 1-800-345-6611 |
| Updated Prospectus Web Address | columbiathreadneedleus.com/resources/literature |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 2 Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Columbia Oregon Intermediate Municipal Bond Fund |
| Class Name | Institutional 2 Class |
| Trading Symbol | CODRX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Columbia Oregon Intermediate Municipal Bond Fund (the Fund) for the period of August 1, 2023 to July 31, 2024. |
| 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 1-800-345-6611. |
| 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) Class Cost of a $10,000 investment Cost paid as a percentage of a $10,000 investment Institutional 2 Class $ 0.53 % |
| Expenses Paid, Amount | $ 54 |
| Expense Ratio, Percent | 0.53% |
| 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 Allocations Security selection Top Performance Detractors Allocations Security selection |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future performance. |
| Line Graph [Table Text Block] | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (%) 1 year 5 years 10 years Institutional 2 Class (a) 2.87 0.75 1.77 Bloomberg 3-15 Year Blend Municipal Bond Index 3.14 1.17 2.26 Bloomberg Municipal Bond Index 3.74 1.18 2.47 (a) Effective August 1, 2024, the Fund compares its performance to the Bloomberg Municipal Bond Index, a broad-based performance index that meets new regulatory requirements. The Fund’s performance is also compared to its prior benchmark, which more closely represents the market sectors and/or asset classes in which the Fund primarily invests. |
| 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. |
| Material Change Date | Aug. 01, 2024 |
| Updated Performance Information Location [Text Block] | Visit columbiathreadneedleus.com/investment-products/mutual-funds |
| Net Assets | $ 304,334,086 |
| Holdings Count | Holding | 202 |
| Advisory Fees Paid, Amount | $ 1,400,310 |
| Investment Company, Portfolio Turnover | 13% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Fund net assets $ Total number of portfolio holdings 202 Management services fees $ Portfolio turnover for the reporting period 13% |
| 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, 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, S&P and 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 Oregon Health & Science University 2.5 % City of Portland Water System 2.5 % Tri-County Metropolitan Transportation District of Oregon 2.4 % Oregon Health & Science University 1.9 % State of Oregon Department of Transportation 1.8 % Puerto Rico Public Finance Corp. 1.7 % Port of Portland 1.6 % Washington Clackamas & Yamhill Counties School District No. 88J 1.5 % Port of Portland Airport 1.4 % State of Oregon Department of Transportation 1.4 % Asset Categories Credit Quality |
| 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, 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, S&P and 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 Oregon Health & Science University 2.5 % City of Portland Water System 2.5 % Tri-County Metropolitan Transportation District of Oregon 2.4 % Oregon Health & Science University 1.9 % State of Oregon Department of Transportation 1.8 % Puerto Rico Public Finance Corp. 1.7 % Port of Portland 1.6 % Washington Clackamas & Yamhill Counties School District No. 88J 1.5 % Port of Portland Airport 1.4 % State of Oregon Department of Transportation 1.4 % |
| 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 |
| Material Fund Change Strategies [Text Block] | On July 26, 2024, the Fund supplemented its Prospectus’ Principal Investment Strategies to reflect that the Fund may enter into tender option bond (TOB) transactions and may invest in derivatives, such as floating rate municipal securities (floaters) and inverse floating rate municipal securities (inverse floaters) to add incremental income, futures (including interest rate and Treasury bond futures) to manage duration and hedge against changes in interest rates, and swaps, including Municipal Market Data Rate Locks (MMD Rate Locks) to manage duration and hedge against changes in interest rates. |
| Material Fund Change Risks Change [Text Block] | In addition, the Fund amended its Prospectus’ Principal Risks to include disclosure of the risks associated with investing in these instruments and derivatives generally. |
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund during the reporting period. For more complete information, you may review the Fund’s prospectus, which is available at columbiathreadneedleus.com/resources/literature |
| Updated Prospectus Phone Number | 1-800-345-6611 |
| Updated Prospectus Web Address | columbiathreadneedleus.com/resources/literature |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 3 Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Columbia Oregon Intermediate Municipal Bond Fund |
| Class Name | Institutional 3 Class |
| Trading Symbol | CORYX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Columbia Oregon Intermediate Municipal Bond Fund (the Fund) for the period of August 1, 2023 to July 31, 2024. |
| 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 1-800-345-6611. |
| 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) Class Cost of a $10,000 investment Cost paid as a percentage of a $10,000 investment Institutional 3 Class $ 0.48 % |
| Expenses Paid, Amount | $ 49 |
| Expense Ratio, Percent | 0.48% |
| 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 Allocations Security selection Top Performance Detractors Allocations Security selection |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future performance. |
| Line Graph [Table Text Block] | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (%) 1 year 5 years 10 years Institutional 3 Class (a),(b) 3.01 0.82 1.80 Bloomberg 3-15 Year Blend Municipal Bond Index 3.14 1.17 2.26 Bloomberg Municipal Bond Index 3.74 1.18 2.47 (a) The returns shown for periods prior to March 1, 2017 (including returns for the Life of the Fund, if shown, which are since Fund inception) 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/investor/investment-products/mutual-funds/appended-performance (b) Effective August 1, 2024, the Fund compares its performance to the Bloomberg Municipal Bond Index, a broad-based performance index that meets new regulatory requirements. The Fund’s performance is also compared to its prior benchmark, which more closely represents the market sectors and/or asset classes in which the Fund primarily invests. |
| 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. |
| Material Change Date | Aug. 01, 2024 |
| Updated Performance Information Location [Text Block] | Visit columbiathreadneedleus.com/investment-products/mutual-funds |
| Net Assets | $ 304,334,086 |
| Holdings Count | Holding | 202 |
| Advisory Fees Paid, Amount | $ 1,400,310 |
| Investment Company, Portfolio Turnover | 13% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Fund net assets $ Total number of portfolio holdings 202 Management services fees $ Portfolio turnover for the reporting period 13% |
| 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 r at Top Holdings Oregon Health & Science University 2.5 % City of Portland Water System 2.5 % Tri-County Metropolitan Transportation District of Oregon 2.4 % Oregon Health & Science University 1.9 % State of Oregon Department of Transportation 1.8 % Puerto Rico Public Finance Corp. 1.7 % Port of Portland 1.6 % Washington Clackamas & Yamhill Counties School District No. 88J 1.5 % Port of Portland Airport 1.4 % State of Oregon Department of Transportation 1.4 % Asset Categories Credit Quality |
| 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 r at |
| Largest Holdings [Text Block] | Top Holdings Oregon Health & Science University 2.5 % City of Portland Water System 2.5 % Tri-County Metropolitan Transportation District of Oregon 2.4 % Oregon Health & Science University 1.9 % State of Oregon Department of Transportation 1.8 % Puerto Rico Public Finance Corp. 1.7 % Port of Portland 1.6 % Washington Clackamas & Yamhill Counties School District No. 88J 1.5 % Port of Portland Airport 1.4 % State of Oregon Department of Transportation 1.4 % |
| 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 |
| Material Fund Change Strategies [Text Block] | On July 26, 2024, the Fund supplemented its Prospectus’ Principal Investment Strategies to reflect that the Fund may enter into tender option bond (TOB) transactions and may invest in derivatives, such as floating rate municipal securities (floaters) and inverse floating rate municipal securities (inverse floaters) to add incremental income, futures (including interest rate and Treasury bond futures) to manage duration and hedge against changes in interest rates, and swaps, including Municipal Market Data Rate Locks (MMD Rate Locks) to manage duration and hedge against changes in interest rates. |
| Material Fund Change Risks Change [Text Block] | In addition, the Fund amended its Prospectus’ Principal Risks to include disclosure of the risks associated with investing in these instruments and derivatives generally. |
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund during the reporting period. For more complete information, you may review the Fund’s prospectus, which is available at columbiathreadneedleus.com/resources/literature |
| Updated Prospectus Phone Number | 1-800-345-6611 |
| Updated Prospectus Web Address | columbiathreadneedleus.com/resources/literature |
| Shareholder Report, Line Graph (Details) - USD ($) | 12 Months Ended | ||||||||||
| Jul. 31, 2024 | Jul. 31, 2023 | Jul. 31, 2022 | Jul. 31, 2021 | Jul. 31, 2020 | Jul. 31, 2019 | Jul. 31, 2018 | Jul. 31, 2017 | Jul. 31, 2016 | Jul. 31, 2015 | Jul. 31, 2014 | |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 3 Class | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Institutional 3 Class (a),(b) | ||||||||||
| Account Value | $ 11,952 | $ 11,603 | $ 11,566 | $ 12,240 | $ 12,033 | $ 11,476 | $ 10,788 | $ 10,760 | $ 10,773 | $ 10,242 | $ 10,000 |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 2 Class | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Institutional 2 Class (a) | ||||||||||
| Account Value | $ 11,921 | 11,589 | 11,548 | 12,230 | 12,029 | 11,486 | 10,803 | 10,772 | 10,791 | 10,254 | 10,000 |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional Class | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Institutional Class (a) | ||||||||||
| Account Value | $ 11,881 | 11,553 | 11,515 | 12,197 | 12,001 | 11,454 | 10,785 | 10,758 | 10,773 | 10,242 | 10,000 |
| Columbia Oregon Intermediate Municipal Bond Fund Advisor Class | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Advisor Class (a) | ||||||||||
| Account Value | $ 11,902 | 11,563 | 11,534 | 12,208 | 12,011 | 11,464 | 10,794 | 10,767 | 10,781 | 10,250 | 10,000 |
| Columbia Oregon Intermediate Municipal Bond Fund Class A | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Class A (including sales charges) (a) | ||||||||||
| Account Value | $ 11,241 | 10,957 | 10,948 | 11,627 | 11,468 | 10,973 | 10,358 | 10,357 | 10,398 | 9,910 | 9,700 |
| Bloomberg 3-15 Year Blend Municipal Bond Index [Member] | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Bloomberg 3-15 Year Blend Municipal Bond Index | ||||||||||
| Account Value | $ 12,507 | 12,126 | 12,011 | 12,720 | 12,398 | 11,798 | 11,023 | 10,962 | 10,915 | 10,287 | 10,000 |
| Bloomberg Municipal Bond Index [Member] | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||
| Account Value | $ 12,762 | $ 12,301 | $ 12,188 | $ 13,095 | $ 12,678 | $ 12,033 | $ 11,214 | $ 11,104 | $ 11,075 | $ 10,356 | $ 10,000 |
| Shareholder Report, Average Annual Return (Details) | 12 Months Ended | 60 Months Ended | 120 Months Ended | |
| Jul. 31, 2024 | Jul. 31, 2024 | Jul. 31, 2024 | ||
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 3 Class | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Institutional 3 Class (a),(b) | |||
| Average Annual Return, Percent | [1],[2] | 3.01% | 0.82% | 1.80% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 2 Class | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Institutional 2 Class (a) | |||
| Average Annual Return, Percent | [1] | 2.87% | 0.75% | 1.77% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional Class | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Institutional Class (a) | |||
| Average Annual Return, Percent | [1] | 2.84% | 0.73% | 1.74% |
| Columbia Oregon Intermediate Municipal Bond Fund Advisor Class | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Advisor Class (a) | |||
| Average Annual Return, Percent | [1] | 2.93% | 0.75% | 1.76% |
| Columbia Oregon Intermediate Municipal Bond Fund Class A | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Class A (including sales charges) (a) | |||
| Average Annual Return, Percent | [1] | (0.52%) | (0.13%) | 1.18% |
| Without Sales Load [Member] | Columbia Oregon Intermediate Municipal Bond Fund Class A | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Class A (excluding sales charges) (a) | |||
| Average Annual Return, Percent | [1] | 2.59% | 0.48% | 1.48% |
| Bloomberg 3-15 Year Blend Municipal Bond Index [Member] | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg 3-15 Year Blend Municipal Bond Index | |||
| Average Annual Return, Percent | 3.14% | 1.17% | 2.26% | |
| Bloomberg Municipal Bond Index [Member] | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | |||
| Average Annual Return, Percent | 3.74% | 1.18% | 2.47% | |
| [1]Effective August 1, 2024, the Fund compares its performance to the Bloomberg Municipal Bond Index, a broad-based performance index that meets new regulatory requirements. The Fund’s performance is also compared to its prior benchmark, which more closely represents the market sectors and/or asset classes in which the Fund primarily invests.[2]The returns shown for periods prior to March 1, 2017 (including returns for the Life of the Fund, if shown, which are since Fund inception) 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/investor/investment-products/mutual-funds/appended-performance for more information. | ||||
| Shareholder Report, Holdings (Details) | Jul. 31, 2024 |
| Columbia Oregon Intermediate Municipal Bond Fund Class A | Oregon Health Science University 07/01/2034 5.000 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Columbia Oregon Intermediate Municipal Bond Fund Class A | City of Portland Water System 04/01/2030 4.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Columbia Oregon Intermediate Municipal Bond Fund Class A | Tri-County Metropolitan Transportation District of Oregon 10/01/2032 5.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Columbia Oregon Intermediate Municipal Bond Fund Class A | Oregon Health & Science University 07/01/2032 5.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Columbia Oregon Intermediate Municipal Bond Fund Class A | State of Oregon Department of Transportation 11/15/2037 5.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Columbia Oregon Intermediate Municipal Bond Fund Class A | Puerto Rico Public Finance Corp. 08/01/2026 6.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| Columbia Oregon Intermediate Municipal Bond Fund Class A | Port of Portland 07/01/2039 4.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| Columbia Oregon Intermediate Municipal Bond Fund Class A | Washington Clackamas & Yamhill Counties School District No. 88J 06/15/2031 5.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Columbia Oregon Intermediate Municipal Bond Fund Class A | Port of Portland Airport 07/01/2042 5.250% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Columbia Oregon Intermediate Municipal Bond Fund Class A | State of Oregon Department of Transportation 11/15/2026 5.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Columbia Oregon Intermediate Municipal Bond Fund Class A | AAA rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Columbia Oregon Intermediate Municipal Bond Fund Class A | AA rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 75.20% |
| Columbia Oregon Intermediate Municipal Bond Fund Class A | A rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.20% |
| Columbia Oregon Intermediate Municipal Bond Fund Class A | BBB rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Columbia Oregon Intermediate Municipal Bond Fund Class A | BB rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Columbia Oregon Intermediate Municipal Bond Fund Class A | Not rated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| Columbia Oregon Intermediate Municipal Bond Fund Class A | Municipal Bond [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 97.60% |
| Columbia Oregon Intermediate Municipal Bond Fund Class A | Floating Rate Notes [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Columbia Oregon Intermediate Municipal Bond Fund Class A | Other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Columbia Oregon Intermediate Municipal Bond Fund Advisor Class | Oregon Health Science University 07/01/2034 5.000 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Columbia Oregon Intermediate Municipal Bond Fund Advisor Class | City of Portland Water System 04/01/2030 4.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Columbia Oregon Intermediate Municipal Bond Fund Advisor Class | Tri-County Metropolitan Transportation District of Oregon 10/01/2032 5.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Columbia Oregon Intermediate Municipal Bond Fund Advisor Class | Oregon Health & Science University 07/01/2032 5.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Columbia Oregon Intermediate Municipal Bond Fund Advisor Class | State of Oregon Department of Transportation 11/15/2037 5.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Columbia Oregon Intermediate Municipal Bond Fund Advisor Class | Puerto Rico Public Finance Corp. 08/01/2026 6.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| Columbia Oregon Intermediate Municipal Bond Fund Advisor Class | Port of Portland 07/01/2039 4.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| Columbia Oregon Intermediate Municipal Bond Fund Advisor Class | Washington Clackamas & Yamhill Counties School District No. 88J 06/15/2031 5.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Columbia Oregon Intermediate Municipal Bond Fund Advisor Class | Port of Portland Airport 07/01/2042 5.250% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Columbia Oregon Intermediate Municipal Bond Fund Advisor Class | State of Oregon Department of Transportation 11/15/2026 5.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Columbia Oregon Intermediate Municipal Bond Fund Advisor Class | AAA rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Columbia Oregon Intermediate Municipal Bond Fund Advisor Class | AA rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 75.20% |
| Columbia Oregon Intermediate Municipal Bond Fund Advisor Class | A rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.20% |
| Columbia Oregon Intermediate Municipal Bond Fund Advisor Class | BBB rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Columbia Oregon Intermediate Municipal Bond Fund Advisor Class | BB rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Columbia Oregon Intermediate Municipal Bond Fund Advisor Class | Not rated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| Columbia Oregon Intermediate Municipal Bond Fund Advisor Class | Municipal Bond [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 97.60% |
| Columbia Oregon Intermediate Municipal Bond Fund Advisor Class | Floating Rate Notes [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Columbia Oregon Intermediate Municipal Bond Fund Advisor Class | Other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional Class | Oregon Health Science University 07/01/2034 5.000 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional Class | City of Portland Water System 04/01/2030 4.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional Class | Tri-County Metropolitan Transportation District of Oregon 10/01/2032 5.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional Class | Oregon Health & Science University 07/01/2032 5.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional Class | State of Oregon Department of Transportation 11/15/2037 5.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional Class | Puerto Rico Public Finance Corp. 08/01/2026 6.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional Class | Port of Portland 07/01/2039 4.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional Class | Washington Clackamas & Yamhill Counties School District No. 88J 06/15/2031 5.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional Class | Port of Portland Airport 07/01/2042 5.250% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional Class | State of Oregon Department of Transportation 11/15/2026 5.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional Class | AAA rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional Class | AA rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 75.20% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional Class | A rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.20% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional Class | BBB rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional Class | BB rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional Class | Not rated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional Class | Municipal Bond [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 97.60% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional Class | Floating Rate Notes [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional Class | Other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 2 Class | Oregon Health Science University 07/01/2034 5.000 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 2 Class | City of Portland Water System 04/01/2030 4.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 2 Class | Tri-County Metropolitan Transportation District of Oregon 10/01/2032 5.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 2 Class | Oregon Health & Science University 07/01/2032 5.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 2 Class | State of Oregon Department of Transportation 11/15/2037 5.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 2 Class | Puerto Rico Public Finance Corp. 08/01/2026 6.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 2 Class | Port of Portland 07/01/2039 4.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 2 Class | Washington Clackamas & Yamhill Counties School District No. 88J 06/15/2031 5.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 2 Class | Port of Portland Airport 07/01/2042 5.250% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 2 Class | State of Oregon Department of Transportation 11/15/2026 5.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 2 Class | AAA rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 2 Class | AA rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 75.20% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 2 Class | A rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.20% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 2 Class | BBB rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 2 Class | BB rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 2 Class | Not rated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 2 Class | Municipal Bond [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 97.60% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 2 Class | Floating Rate Notes [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 2 Class | Other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 3 Class | Oregon Health Science University 07/01/2034 5.000 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 3 Class | City of Portland Water System 04/01/2030 4.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 3 Class | Tri-County Metropolitan Transportation District of Oregon 10/01/2032 5.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 3 Class | Oregon Health & Science University 07/01/2032 5.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 3 Class | State of Oregon Department of Transportation 11/15/2037 5.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 3 Class | Puerto Rico Public Finance Corp. 08/01/2026 6.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 3 Class | Port of Portland 07/01/2039 4.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 3 Class | Washington Clackamas & Yamhill Counties School District No. 88J 06/15/2031 5.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 3 Class | Port of Portland Airport 07/01/2042 5.250% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 3 Class | State of Oregon Department of Transportation 11/15/2026 5.000% [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 3 Class | AAA rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 3 Class | AA rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 75.20% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 3 Class | A rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.20% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 3 Class | BBB rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 3 Class | BB rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 3 Class | Not rated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 3 Class | Municipal Bond [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 97.60% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 3 Class | Floating Rate Notes [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Columbia Oregon Intermediate Municipal Bond Fund Institutional 3 Class | Other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
