v3.26.1
Shareholder Report
 6 Months Ended
Jun. 30, 2026
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name AMG ETF Trust
Entity Central Index Key 0000879947
Entity Investment Company Type N-1A
Document Period End Date Jun. 30, 2026
C000263709 [Member]  
Shareholder Report [Line Items]  
Fund Name AMG GW&K Muni Income ETF
Class Name AMG GW&K Muni Income ETF
Trading Symbol MUNX
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about AMG GW&K Muni Income ETF (the “Fund”) for the period of January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://amgefts.com/literature. You can also request this information by contacting us at 844.545.1258.
Additional Information Phone Number 844.545.1258
Additional Information Website https://amgefts.com/literature
Expenses [Text Block]
Fund Expenses
What were the Fund costs for the last six months?
(Based on a hypothetical $10,000 investment)
Fund (Class) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
AMG GW&K Muni Income ETF
(MUNX)		 $15 0.29%
Expenses Paid, Amount $ 15
Expense Ratio, Percent 0.29%
Net Assets $ 20,136,128
Holdings Count | Holding 75
Advisory Fees Paid, Amount $ 24,061
Investment Company Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics (as of June 30, 2026)
Fund net assets $20,136,128
Total number of portfolio holdings 75
Net advisory fees paid $24,061
Portfolio turnover rate as of the end of the reporting period 12%
Holdings [Text Block]
Graphical Representation of Holdings (as of June 30, 2026)
Top ten holdings and portfolio breakdown are shown as a percentage of net assets of the Fund and ratings are shown as a percentage of total long-term investments of the Fund.
Top Ten Holdings
Commonwealth Financing Authority, 4.000%, 06/01/39 3.1%
County of Jefferson Sewer Revenue, 5.500%, 10/01/53 2.6%
Pennsylvania Economic Development Financing Authority, 5.250%, 06/30/35 2.6%
City of Houston Hotel Occupancy Tax & Special Revenue, Series C, 5.000%, 09/01/38 2.2%
North Dakota Housing Finance Agency, Series C, 4.700%, 07/01/45 2.2%
New York Transportation Development Corp., 6.000%, 06/30/55 2.1%
Philadelphia Gas Works Co., 5.000%, 10/01/32 2.1%
JEA Electric System Revenue, Series B, 4.000%, 10/01/37 2.1%
Massachusetts Development Finance Agency, Series A, 5.500%, 10/01/44 2.0%
Texas Private Activity Bond Surface Transportation Corp., 5.000%, 06/30/58 2.0%
Top Ten as a Group 23.0%
Portfolio Breakdown
Graphical Representation - Allocation 1 Chart
Ratings
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Ten Holdings
Commonwealth Financing Authority, 4.000%, 06/01/39 3.1%
County of Jefferson Sewer Revenue, 5.500%, 10/01/53 2.6%
Pennsylvania Economic Development Financing Authority, 5.250%, 06/30/35 2.6%
City of Houston Hotel Occupancy Tax & Special Revenue, Series C, 5.000%, 09/01/38 2.2%
North Dakota Housing Finance Agency, Series C, 4.700%, 07/01/45 2.2%
New York Transportation Development Corp., 6.000%, 06/30/55 2.1%
Philadelphia Gas Works Co., 5.000%, 10/01/32 2.1%
JEA Electric System Revenue, Series B, 4.000%, 10/01/37 2.1%
Massachusetts Development Finance Agency, Series A, 5.500%, 10/01/44 2.0%
Texas Private Activity Bond Surface Transportation Corp., 5.000%, 06/30/58 2.0%
Top Ten as a Group 23.0%