v3.25.2
Shareholder Report, Line Graph (Details) - USD ($)
 12 Months Ended 24 Months Ended 36 Months Ended 48 Months Ended 60 Months Ended 72 Months Ended 84 Months Ended 96 Months Ended 108 Months Ended 120 Months Ended
Jul. 31, 2015
Jul. 31, 2025
Jul. 31, 2016
Jul. 31, 2017
Jul. 31, 2018
Jul. 31, 2019
Jul. 31, 2020
Jul. 31, 2021
Jul. 31, 2022
Jul. 31, 2023
Jul. 31, 2024
Jul. 31, 2025
Columbia Oregon Intermediate Municipal Bond Fund - Class A                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Class A (including sales charges)                    
Accumulated Value $ 9,698   $ 10,175 $ 10,136 $ 10,136 $ 10,738 $ 11,223 $ 11,378 $ 10,714 $ 10,723 $ 11,000 $ 11,090
Columbia Oregon Intermediate Municipal Bond Fund - Institutional Class                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Institutional Class                    
Accumulated Value 10,000   10,518 10,504 10,530 11,183 11,718 11,909 11,242 11,280 11,600 11,724
Columbia Oregon Intermediate Municipal Bond Fund - Institutional 2 Class                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Institutional 2 Class                    
Accumulated Value 10,000   10,524 10,505 10,535 11,202 11,731 11,927 11,262 11,302 11,626 11,754
Columbia Oregon Intermediate Municipal Bond Fund - Institutional 3 Class                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Institutional 3 Class                    
Accumulated Value 10,000   10,518 10,506 10,533 11,204 11,748 11,950 11,292 11,329 11,669 11,804
Columbia Oregon Intermediate Municipal Bond Fund - Class S                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Class S                    
Accumulated Value 10,000   10,518 10,504 10,530 11,183 11,718 11,909 11,242 11,280 11,600 11,724
Bloomberg Municipal Bond Index [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg Municipal Bond Index                    
Accumulated Value 10,000   10,694 10,722 10,828 11,619 12,242 12,645 11,769 11,878 12,323 12,322
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                    
Accumulated Value $ 10,000   $ 10,611 $ 10,657 $ 10,716 $ 11,470 $ 12,053 $ 12,366 $ 11,676 $ 11,788 $ 12,158 $ 12,384