Cover |
12 Months Ended |
|---|---|
Sep. 30, 2025 | |
| Document Information [Line Items] | |
| Document Type | 11-K |
| Entity Registrant Name | Timberland Bancorp Inc |
| Amendment Flag | false |
| Entity Central Index Key | 0001046050 |
| EBP 002 | |
| Document Information [Line Items] | |
| Document Type | 11-K |
| Entity Registrant Name | Timberland Bancorp Inc |
| Amendment Flag | false |
| Entity Central Index Key | 0001046050 |