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Regulatory Matters: Schedule of Compliance with Regulatory Capital Requirements for Mortgage Companies (Details) $ in Thousands | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($)
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Timberland Bank |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Tier 1 Leverage Capital, Actual Amount | $ 229,206 | $ 218,749
Tier 1 Leverage Capital, Actual Ratio | 0.120 | 0.120
Tier 1 Leverage Capital, Regulatory Minimum To Be Adequately Capitalized, Amount | $ 76,319 | $ 72,983
Tier 1 Leverage Capital, Regulatory Minimum To Be Adequately Capitalized, Ratio | 0.040 | 0.040
Tier 1 Leverage Capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount | $ 95,399 | $ 91,229
Tier 1 Leverage Capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio | 0.050 | 0.050
Tier 1 Risk-based Capital Ratio, Common Equity, Actual Amount | $ 229,206 | $ 218,749
Tier 1 Risk-based Capital Ratio, Common Equity, Actual Ratio | 18.00% | 18.00%
Tier 1 Risk-based Capital Ratio, Regulatory Minimum To Be Adequately Capitalized, Amount | $ 57,318 | $ 54,549
Tier 1 Risk-based Capital Ratio, Regulatory Minimum To Be Adequately Capitalized, Ratio | 4.50% | 4.50%
Tier 1 Risk-based Capital Ratio, Regulatory Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount | $ 82,793 | $ 78,792
Tier 1 Risk-based Capital Ratio, Regulatory Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio | 6.50% | 6.50%
Tier 1 Risk-based Capital, Actual Amount | $ 229,206 | $ 218,749
Tier 1 Risk-based Capital, Actual Ratio | 0.180 | 0.180
Tier 1 Risk-based Capital, Regulatory Minimum To Be Adequately Capitalized, Amount | $ 76,424 | $ 72,731
Tier 1 Risk-based Capital, Regulatory Minimum To Be Adequately Capitalized, Ratio | 0.060 | 0.060
Tier 1 Risk-based Capital, Regulatory Minimum To Be Well Capitalized, Amount | $ 101,899 | $ 96,975
Tier 1 Risk-based Capital, Regulatory Minimum To Be Well Capitalized, Ratio | 0.080 | 0.080
Total Capital, Actual Amount | $ 245,152 | $ 233,914
Total Capital, Actual Ratio | 0.193 | 0.193
Total Capital, Regulatory Minimum To Be Adequately Capitalized, Amount | $ 101,899 | $ 96,975
Total Capital, Regulatory Minimum To Be Adequately Capitalized, Ratio | 0.080 | 0.080
Total Capital, Regulatory Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount | $ 127,374 | $ 121,219
Total Capital, Regulatory Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio | 0.100 | 0.100
Timberland Bancorp |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Tier 1 Leverage Capital, Actual Amount | $ 231,092 | $ 219,851
Tier 1 Leverage Capital, Actual Ratio | 0.121 | 0.121
Tier 1 Risk-based Capital Ratio, Common Equity, Actual Amount | $ 231,092 | $ 219,851
Tier 1 Risk-based Capital Ratio, Common Equity, Actual Ratio | 18.10% | 18.10%
Tier 1 Risk-based Capital, Actual Amount | $ 231,092 | $ 219,851
Tier 1 Risk-based Capital, Actual Ratio | 0.181 | 0.181
Total Capital, Actual Amount | $ 247,044 | $ 235,023
Total Capital, Actual Ratio | 0.194 | 0.194

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