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Regulatory Matters: Schedule of Compliance with Regulatory Capital Requirements for Mortgage Companies (Details) $ in Thousands | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($)
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Timberland Bank |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Tier 1 Leverage Capital, Actual Amount | $ 218,749 | $ 202,438
Tier 1 Leverage Capital, Actual Ratio | 0.120 | 0.109
Tier 1 Leverage Capital, Regulatory Minimum To Be Adequately Capitalized, Amount | $ 72,983 | $ 74,039
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 | $ 91,229 | $ 92,549
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 | $ 218,749 | $ 202,438
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 | $ 54,549 | $ 50,551
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 | $ 78,792 | $ 73,018
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 | $ 218,749 | $ 202,438
Tier 1 Risk-based Capital, Actual Ratio | 0.180 | 0.180
Tier 1 Risk-based Capital, Regulatory Minimum To Be Adequately Capitalized, Amount | $ 72,731 | $ 67,402
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 | $ 96,975 | $ 89,869
Tier 1 Risk-based Capital, Regulatory Minimum To Be Well Capitalized, Ratio | 0.080 | 0.080
Total Capital, Actual Amount | $ 233,914 | $ 216,446
Total Capital, Actual Ratio | 0.193 | 0.193
Total Capital, Regulatory Minimum To Be Adequately Capitalized, Amount | $ 96,975 | $ 89,869
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 | $ 121,219 | $ 112,336
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 | $ 219,851 | $ 204,659
Tier 1 Leverage Capital, Actual Ratio | 0.121 | 0.110
Tier 1 Risk-based Capital Ratio, Common Equity, Actual Amount | $ 219,851 | $ 204,659
Tier 1 Risk-based Capital Ratio, Common Equity, Actual Ratio | 18.10% | 18.20%
Tier 1 Risk-based Capital, Actual Amount | $ 219,851 | $ 204,659
Tier 1 Risk-based Capital, Actual Ratio | 0.181 | 0.182
Total Capital, Actual Amount | $ 235,023 | $ 218,667
Total Capital, Actual Ratio | 0.194 | 0.195

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