Shareholder Report, Holdings (Details)	Jul. 31, 2025
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	2.70%
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	2.60%
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	2.50%
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 \| City of Portland Sewer System 12/01/2042 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	1.80%
Columbia Oregon Intermediate Municipal Bond Fund - Class A \| State of Oregon Housing & Community Services Department 01/10/2048 4.000% [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.80%
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 \| Port of Portland 07/01/2039 4.000% [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.70%
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	1.60%
Columbia Oregon Intermediate Municipal Bond Fund - Class A \| Municipal Bonds [Member]
Holdings [Line Items]
Percent of Net Asset Value	98.70%
Columbia Oregon Intermediate Municipal Bond Fund - Class A \| Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.50%
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	2.70%
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	2.60%
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	2.50%
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 \| City of Portland Sewer System 12/01/2042 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	1.80%
Columbia Oregon Intermediate Municipal Bond Fund - Institutional Class \| State of Oregon Housing & Community Services Department 01/10/2048 4.000% [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.80%
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 \| Port of Portland 07/01/2039 4.000% [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.70%
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	1.60%
Columbia Oregon Intermediate Municipal Bond Fund - Institutional Class \| Municipal Bonds [Member]
Holdings [Line Items]
Percent of Net Asset Value	98.70%
Columbia Oregon Intermediate Municipal Bond Fund - Institutional Class \| Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.50%
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	2.70%
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	2.60%
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	2.50%
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 \| City of Portland Sewer System 12/01/2042 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	1.80%
Columbia Oregon Intermediate Municipal Bond Fund - Institutional 2 Class \| State of Oregon Housing & Community Services Department 01/10/2048 4.000% [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.80%
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 \| Port of Portland 07/01/2039 4.000% [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.70%
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	1.60%
Columbia Oregon Intermediate Municipal Bond Fund - Institutional 2 Class \| Municipal Bonds [Member]
Holdings [Line Items]
Percent of Net Asset Value	98.70%
Columbia Oregon Intermediate Municipal Bond Fund - Institutional 2 Class \| Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.50%
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	2.70%
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	2.60%
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	2.50%
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 \| City of Portland Sewer System 12/01/2042 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	1.80%
Columbia Oregon Intermediate Municipal Bond Fund - Institutional 3 Class \| State of Oregon Housing & Community Services Department 01/10/2048 4.000% [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.80%
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 \| Port of Portland 07/01/2039 4.000% [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.70%
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	1.60%
Columbia Oregon Intermediate Municipal Bond Fund - Institutional 3 Class \| Municipal Bonds [Member]
Holdings [Line Items]
Percent of Net Asset Value	98.70%
Columbia Oregon Intermediate Municipal Bond Fund - Institutional 3 Class \| Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Columbia Oregon Intermediate Municipal Bond Fund - Class S \| Oregon Health & Science University 07/01/2034 5.000% [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
Columbia Oregon Intermediate Municipal Bond Fund - Class S \| City of Portland Water System 04/01/2030 4.000% [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Columbia Oregon Intermediate Municipal Bond Fund - Class S \| Tri-County Metropolitan Transportation District of Oregon 10/01/2032 5.000% [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Columbia Oregon Intermediate Municipal Bond Fund - Class S \| 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 S \| City of Portland Sewer System 12/01/2042 5.000% [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.80%
Columbia Oregon Intermediate Municipal Bond Fund - Class S \| Puerto Rico Public Finance Corp. 08/01/2026 6.000% [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.80%
Columbia Oregon Intermediate Municipal Bond Fund - Class S \| State of Oregon Housing & Community Services Department 01/10/2048 4.000% [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.80%
Columbia Oregon Intermediate Municipal Bond Fund - Class S \| 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 S \| Port of Portland 07/01/2039 4.000% [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.70%
Columbia Oregon Intermediate Municipal Bond Fund - Class S \| Washington Clackamas & Yamhill Counties School District No. 88J 06/15/2031 5.000% [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.60%
Columbia Oregon Intermediate Municipal Bond Fund - Class S \| Municipal Bonds [Member]
Holdings [Line Items]
Percent of Net Asset Value	98.70%
Columbia Oregon Intermediate Municipal Bond Fund - Class S \| Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.50%

Shareholder Report, Holdings (Details)

Jul. 31, 2025