v3.25.2
Shareholder Report, Average Annual Return (Details)
 12 Months Ended 60 Months Ended 120 Months Ended
Apr. 30, 2025
Apr. 30, 2025
Apr. 30, 2025
Columbia Short Duration Municipal Bond Fund - Class A      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Class A (including sales charges)    
Average Annual Return, Percent [1] 2.03% 1.02% 0.92%
Columbia Short Duration Municipal Bond Fund - Institutional Class      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Institutional Class    
Average Annual Return, Percent [1] 3.31% 1.47% 1.28%
Columbia Short Duration Municipal Bond Fund - Institutional 2 Class      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Institutional 2 Class    
Average Annual Return, Percent [1] 3.36% 1.52% 1.34%
Columbia Short Duration Municipal Bond Fund - Institutional 3 Class      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Institutional 3 Class    
Average Annual Return, Percent [1],[2] 3.29% 1.56% 1.34%
Columbia Short Duration Municipal Bond Fund - Class S      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Class S    
Average Annual Return, Percent [1],[3] 3.30% 1.47% 1.28%
Without Sales Load [Member] | Columbia Short Duration Municipal Bond Fund - Class A      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Class A (excluding sales charges)    
Average Annual Return, Percent [1] 3.05% 1.22% 1.02%
Bloomberg Municipal Bond Index [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Bloomberg Municipal Bond Index    
Average Annual Return, Percent [4] 1.66% 1.17% 2.10%
Bloomberg 1-5 Year Municipal Bond Index [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Bloomberg 1-5 Year Municipal Bond Index    
Average Annual Return, Percent 3.28% 1.29% 1.41%
[1] The Fund’s performance prior to September 1, 2022 reflects returns achieved according to different principal investment strategies. If the Fund's current strategies had been in place for the prior periods, results shown may have been different.
[2] 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.
[3] 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.
[4] 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.