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Regulatory Matters: Schedule of Compliance with Regulatory Capital Requirements for Mortgage Companies (Details) $ in Thousands | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($)
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Timberland Bank |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Tier 1 Leverage Capital, Actual Amount | $ 202,438 | $ 188,512
Tier 1 Leverage Capital, Actual Ratio | 0.109 | 0.107
Tier 1 Leverage Capital, Regulatory Minimum To Be Adequately Capitalized, Amount | $ 74,039 | $ 70,240
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 | $ 92,549 | $ 87,801
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 | $ 202,438 | $ 188,512
Tier 1 Risk-based Capital Ratio, Common Equity, Actual Ratio | 18.00% | 20.60%
Tier 1 Risk-based Capital Ratio, Regulatory Minimum To Be Adequately Capitalized, Amount | $ 50,551 | $ 41,257
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 | $ 73,018 | $ 59,593
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 | $ 202,438 | $ 188,512
Tier 1 Risk-based Capital, Actual Ratio | 0.180 | 0.206
Tier 1 Risk-based Capital, Regulatory Minimum To Be Adequately Capitalized, Amount | $ 67,402 | $ 55,009
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 | $ 89,869 | $ 73,345
Tier 1 Risk-based Capital, Regulatory Minimum To Be Well Capitalized, Ratio | 0.080 | 0.080
Total Capital, Actual Amount | $ 216,446 | $ 200,002
Total Capital, Actual Ratio | 0.193 | 0.218
Total Capital, Regulatory Minimum To Be Adequately Capitalized, Amount | $ 89,869 | $ 73,345
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 | $ 112,336 | $ 91,682
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 | $ 204,659 | $ 191,973
Tier 1 Leverage Capital, Actual Ratio | 0.110 | 0.110
Tier 1 Risk-based Capital Ratio, Common Equity, Actual Amount | $ 204,659 | $ 191,973
Tier 1 Risk-based Capital Ratio, Common Equity, Actual Ratio | 18.20% | 20.90%
Tier 1 Risk-based Capital, Actual Amount | $ 204,659 | $ 191,973
Tier 1 Risk-based Capital, Actual Ratio | 0.182 | 0.209
Total Capital, Actual Amount | $ 218,667 | $ 203,475
Total Capital, Actual Ratio | 0.195 | 0.222

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