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Regulatory Matters: Schedule of Compliance with Regulatory Capital Requirements for Mortgage Companies (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Timberland Bank    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 Leverage Capital, Actual Amount $ 117,336 $ 104,102
Tier 1 Leverage Capital, Actual Ratio 11.70% 11.20%
Tier 1 Leverage Capital, Regulatory Minimum To Be Adequately Capitalized, Amount $ 40,024 $ 37,116
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 $ 50,031 $ 46,395
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 $ 117,336 $ 104,102
Tier 1 Risk-based Capital Ratio, Common Equity, Actual Ratio 16.70% 15.90%
Tier 1 Risk-based Capital Ratio, Regulatory Minimum To Be Adequately Capitalized, Amount $ 31,539 $ 29,547
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 $ 45,557 $ 42,678
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 $ 117,336 $ 104,102
Tier 1 Risk-based Capital, Actual Ratio 16.70% 15.90%
Tier 1 Risk-based Capital, Regulatory Minimum To Be Adequately Capitalized, Amount $ 42,052 $ 39,395
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 $ 56,070 $ 52,527
Tier 1 Risk-based Capital, Regulatory Minimum To Be Well Capitalized, Ratio 8.00% 8.00%
Total Capital, Actual Amount $ 126,109 $ 112,329
Total Capital, Actual Ratio 18.00% 17.10%
Total Capital, Regulatory Minimum To Be Adequately Capitalized, Amount $ 56,070 $ 52,527
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 $ 70,087 $ 65,659
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 $ 120,175 $ 107,145
Tier 1 Leverage Capital, Actual Ratio 12.00% 11.50%
Tier 1 Risk-based Capital Ratio, Common Equity, Actual Amount $ 120,175 $ 107,145
Tier 1 Risk-based Capital Ratio, Common Equity, Actual Ratio 17.10% 16.30%
Tier 1 Risk-based Capital, Actual Amount $ 120,175 $ 107,145
Tier 1 Risk-based Capital, Actual Ratio 17.10% 16.30%
Total Capital, Actual Amount $ 128,955 $ 115,376
Total Capital, Actual Ratio 18.40% 17.60%