S000025838 [Member] Expense Example - AMG GW&K Municipal Bond Fund |
Dec. 31, 2025
USD ($)
|
|---|---|
| Class I | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 40 |
| Expense Example, with Redemption, 3 Years | 141 |
| Expense Example, with Redemption, 5 Years | 251 |
| Expense Example, with Redemption, 10 Years | 572 |
| Class N | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 75 |
| Expense Example, with Redemption, 3 Years | 248 |
| Expense Example, with Redemption, 5 Years | 437 |
| Expense Example, with Redemption, 10 Years | $ 983 |