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Regulatory Matters: Schedule of Compliance with Regulatory Capital Requirements for Mortgage Companies (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
Timberland Bank    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 Leverage Capital, Actual Amount $ 152,926 $ 117,336
Tier 1 Leverage Capital, Actual Ratio 12.50% 11.70%
Tier 1 Leverage Capital, Regulatory Minimum To Be Adequately Capitalized, Amount $ 49,044 $ 40,024
Tier 1 Leverage Capital, Regulatory Minimum To Be Adequately Capitalized, Ratio 4.00% 4.00%
Tier 1 Leverage Capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount $ 61,305 $ 50,031
Tier 1 Leverage Capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio 5.00% 5.00%
Tier 1 Risk-based Capital Ratio, Common Equity, Actual Amount $ 152,926 $ 117,336
Tier 1 Risk-based Capital Ratio, Common Equity, Actual Ratio 18.10% 16.70%
Tier 1 Risk-based Capital Ratio, Regulatory Minimum To Be Adequately Capitalized, Amount $ 38,019 $ 31,539
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 $ 54,916 $ 45,557
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 $ 152,926 $ 117,336
Tier 1 Risk-based Capital, Actual Ratio 18.10% 16.70%
Tier 1 Risk-based Capital, Regulatory Minimum To Be Adequately Capitalized, Amount $ 50,692 $ 42,052
Tier 1 Risk-based Capital, Regulatory Minimum To Be Adequately Capitalized, Ratio 6.00% 6.00%
Tier 1 Risk-based Capital, Regulatory Minimum To Be Well Capitalized, Amount $ 67,589 $ 56,070
Tier 1 Risk-based Capital, Regulatory Minimum To Be Well Capitalized, Ratio 8.00% 8.00%
Total Capital, Actual Amount $ 162,857 $ 126,109
Total Capital, Actual Ratio 19.30% 18.00%
Total Capital, Regulatory Minimum To Be Adequately Capitalized, Amount $ 67,589 $ 56,070
Total Capital, Regulatory Minimum To Be Adequately Capitalized, Ratio 8.00% 8.00%
Total Capital, Regulatory Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount $ 84,487 $ 70,087
Total Capital, Regulatory Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio 10.00% 10.00%
Timberland Bancorp    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 Leverage Capital, Actual Amount $ 155,468 $ 120,175
Tier 1 Leverage Capital, Actual Ratio 12.70% 12.00%
Tier 1 Risk-based Capital Ratio, Common Equity, Actual Amount $ 155,468 $ 120,175
Tier 1 Risk-based Capital Ratio, Common Equity, Actual Ratio 18.40% 17.10%
Tier 1 Risk-based Capital, Actual Amount $ 155,468 $ 120,175
Tier 1 Risk-based Capital, Actual Ratio 18.40% 17.10%
Total Capital, Actual Amount $ 165,399 $ 128,955
Total Capital, Actual Ratio 19.60% 18.40%