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Regulatory Matters: Schedule of Compliance with Regulatory Capital Requirements for Mortgage Companies (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016
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Timberland Bank |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Tier 1 Leverage Capital, Actual Amount | $ 104,102 | $ 90,266
Tier 1 Leverage Capital, Actual Ratio | 11.20% | 10.30%
Tier 1 Leverage Capital, Regulatory Minimum To Be Adequately Capitalized, Amount | $ 37,116 | $ 35,183
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 | $ 46,395 | $ 43,979
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 | $ 104,102 | $ 90,266
Tier 1 Risk-based Capital Ratio, Common Equity, Actual Ratio | 15.90% | 14.30%
Tier 1 Risk-based Capital Ratio, Regulatory Minimum To Be Adequately Capitalized, Amount | $ 29,547 | $ 28,318
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 | $ 42,678 | $ 40,904
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 | $ 104,102 | $ 90,266
Tier 1 Risk-based Capital, Actual Ratio | 15.90% | 14.30%
Tier 1 Risk-based Capital, Regulatory Minimum To Be Adequately Capitalized, Amount | $ 39,395 | $ 37,758
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 | $ 52,527 | $ 50,344
Tier 1 Risk-based Capital, Regulatory Minimum To Be Well Capitalized, Ratio | 8.00% | 8.00%
Total Capital, Actual Amount | $ 112,329 | $ 98,158
Total Capital, Actual Ratio | 17.10% | 15.60%
Total Capital, Regulatory Minimum To Be Adequately Capitalized, Amount | $ 52,527 | $ 50,344
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 | $ 65,659 | $ 62,930
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 | $ 107,145 | $ 92,860
Tier 1 Leverage Capital, Actual Ratio | 11.50% | 10.50%
Tier 1 Risk-based Capital Ratio, Common Equity, Actual Amount | $ 107,145 | $ 92,860
Tier 1 Risk-based Capital Ratio, Common Equity, Actual Ratio | 16.30% | 14.80%
Tier 1 Risk-based Capital, Actual Amount | $ 107,145 | $ 92,860
Tier 1 Risk-based Capital, Actual Ratio | 16.30% | 14.80%
Total Capital, Actual Amount | $ 115,376 | $ 100,755
Total Capital, Actual Ratio | 17.60% | 16.00%

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- Definition The amount of total capital as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47304-110998 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47080-110998 + Details
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