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Regulatory Matters (Tables) | 12 Months Ended
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Sep. 30, 2025
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations | The following tables compare the Bank’s actual capital amounts at September 30, 2025 and 2024 to its minimum regulatory capital requirements and "Well Capitalized" regulatory capital at those dates (dollars in thousands):
|  | Actual |  | Regulatory Minimum To Be "Adequately Capitalized" |  | Regulatory Minimum To Be "Well Capitalized" Under Prompt Corrective Action Provisions
September 30, 2025 |  | Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
Leverage Capital Ratio: |  |  |  |  |  |  |  |  |  |  |  |
Tier 1 capital |  | $ | 247,162 |  |  | 12.5 | % |  | $ | 79,319 |  |  | 4.0 | % |  | $ | 99,148 |  |  | 5.0 | %
Risk-based Capital Ratios: |  |  |  |  |  |  |  |  |  |  |  |
CET1 |  | 247,162 |  |  | 19.3 |  |  | 57,623 |  |  | 4.5 |  |  | 83,234 |  |  | 6.5 |
Tier 1 capital |  | 247,162 |  |  | 19.3 |  |  | 76,831 |  |  | 6.0 |  |  | 102,442 |  |  | 8.0 |
Total capital |  | 263,200 |  |  | 20.6 |  |  | 102,442 |  |  | 8.0 |  |  | 128,052 |  |  | 10.0 |
September 30, 2024 |  |  |  |  |  |  |  |  |  |  |  |
Leverage Capital Ratio: |  |  |  |  |  |  |  |  |  |  |  |
Tier 1 capital |  | $ | 229,206 |  |  | 12.0 | % |  | $ | 76,319 |  |  | 4.0 | % |  | $ | 95,399 |  |  | 5.0 | %
Risk-based Capital Ratios: |  |  |  |  |  |  |  |  |  |  |  |
CET1 |  | 229,206 |  |  | 18.0 |  |  | 57,318 |  |  | 4.5 |  |  | 82,793 |  |  | 6.5 |
Tier 1 capital |  | 229,206 |  |  | 18.0 |  |  | 76,424 |  |  | 6.0 |  |  | 101,899 |  |  | 8.0 |
Total capital |  | 245,152 |  |  | 19.3 |  |  | 101,899 |  |  | 8.0 |  |  | 127,374 |  |  | 10.0 |
The following table presents for informational purposes the regulatory capital ratios for Timberland Bancorp at September 30, 2025 and 2024 assuming that Timberland Bancorp was subject to regulatory guidelines for bank holding companies with $3.0 billion or more in assets (dollars in thousands):
| 2025 |  | 2024
| Amount |  | Ratio |  | Amount |  | Ratio
Leverage Capital Ratio: |  |  |  |  |  |  |
Tier 1 capital | $ | 248,755 |  |  | 12.6 | % |  | $ | 231,092 |  |  | 12.1 | %
Risk-based Capital Ratios: |  |  |  |  |  |  |
CET1 | 248,755 |  |  | 19.4 |  |  | 231,092 |  |  | 18.1 |
Tier 1 capital | 248,755 |  |  | 19.4 |  |  | 231,092 |  |  | 18.1 |
Total capital | 264,800 |  |  | 20.7 |  |  | 247,044 |  |  | 19.4 |

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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B + Details
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