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Regulatory Matters (Tables) | 12 Months Ended
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Sep. 30, 2019
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations | The following table presents the regulatory capital ratios for Timberland Bancorp at September 30, 2019 and 2018 assuming Timberland Bancorp was subject to regulatory guidelines for bank holding companies with $3.0 billion or more in assets (dollars in thousands):
| 2019 |  | 2018
| Amount |  | Ratio |  | Amount |  | Ratio
Leverage Capital Ratio: |  |  |  |  |  |  |
Tier 1 capital | $ | 155,468 |  |  | 12.7 | % |  | $ | 120,175 |  |  | 12.0 | %
Risk-based Capital Ratios: |  |  |  |  |  |  |
Common equity Tier 1 capital | 155,468 |  |  | 18.4 |  |  | 120,175 |  |  | 17.1 |
Tier 1 capital | 155,468 |  |  | 18.4 |  |  | 120,175 |  |  | 17.1 |
Total capital | 165,399 |  |  | 19.6 |  |  | 128,955 |  |  | 18.4 |
The following tables compare the Bank’s actual capital amounts at September 30, 2019 and 2018 to its minimum regulatory capital requirements and "Well Capitalized" regulatory capital at those dates (dollars in thousands):
September 30, 2019 | Actual |  | Regulatory Minimum To Be "Adequately Capitalized" |  | Regulatory MinimumTo Be "Well Capitalized" Under Prompt Corrective Action Provisions
| Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
Leverage Capital Ratio: |  |  |  |  |  |  |  |  |  |  |
Tier 1 capital | $ | 152,926 |  |  | 12.5 | % |  | $ | 49,044 |  |  | 4.0 | % |  | $ | 61,305 |  |  | 5.0 | %
Risk-based Capital Ratios: |  |  |  |  |  |  |  |  |  |  |
Common equity Tier 1 capital | 152,926 |  |  | 18.1 |  |  | 38,019 |  |  | 4.5 |  |  | 54,916 |  |  | 6.5 |
Tier 1 capital | 152,926 |  |  | 18.1 |  |  | 50,692 |  |  | 6.0 |  |  | 67,589 |  |  | 8.0 |
Total capital | 162,857 |  |  | 19.3 |  |  | 67,589 |  |  | 8.0 |  |  | 84,487 |  |  | 10.0 |
September 30, 2018 | Actual |  | Regulatory Minimum To Be "Adequately Capitalized" |  | Regulatory Minimum To Be "Well Capitalized" Under Prompt Corrective Action Provisions
| Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
Leverage Capital Ratio: |  |  |  |  |  |  |  |  |  |  |
Tier 1 capital | $ | 117,336 |  |  | 11.7 | % |  | $ | 40,024 |  |  | 4.0 | % |  | $ | 50,031 |  |  | 5.0 | %
Risk-based Capital Ratios: |  |  |  |  |  |  |  |  |  |  |
Common equity Tier 1 capital | 117,336 |  |  | 16.7 |  |  | 31,539 |  |  | 4.5 |  |  | 45,557 |  |  | 6.5 |
Tier 1 capital | 117,336 |  |  | 16.7 |  |  | 42,052 |  |  | 6.0 |  |  | 56,070 |  |  | 8.0 |
Total capital | 126,109 |  |  | 18.0 |  |  | 56,070 |  |  | 8.0 |  |  | 70,087 |  |  | 10.0 |

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