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Regulatory Matters (Tables)

12 Months Ended

Sep. 30, 2019

Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]

Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations

The following table presents the regulatory capital ratios for Timberland Bancorp at September 30, 2019 and 2018 assuming Timberland Bancorp was subject to regulatory guidelines for bank holding companies with $3.0 billion or more in assets (dollars in thousands):

	2019							2018
	Amount				Ratio			Amount				Ratio
Leverage Capital Ratio:
Tier 1 capital	$	155,468			12.7	%		$	120,175			12.0	%
Risk-based Capital Ratios:
Common equity Tier 1 capital	155,468				18.4			120,175				17.1
Tier 1 capital	155,468				18.4			120,175				17.1
Total capital	165,399				19.6			128,955				18.4

The following tables compare the Bank’s actual capital amounts at September 30, 2019 and 2018 to its minimum regulatory capital requirements and "Well Capitalized" regulatory capital at those dates (dollars in thousands):

September 30, 2019	Actual							Regulatory Minimum To Be "Adequately Capitalized"							Regulatory MinimumTo Be "Well Capitalized" Under Prompt Corrective Action Provisions
	Amount				Ratio			Amount				Ratio			Amount				Ratio
Leverage Capital Ratio:
Tier 1 capital	$	152,926			12.5	%		$	49,044			4.0	%		$	61,305			5.0	%
Risk-based Capital Ratios:
Common equity Tier 1 capital	152,926				18.1			38,019				4.5			54,916				6.5
Tier 1 capital	152,926				18.1			50,692				6.0			67,589				8.0
Total capital	162,857				19.3			67,589				8.0			84,487				10.0

September 30, 2018	Actual							Regulatory Minimum To Be "Adequately Capitalized"							Regulatory Minimum To Be "Well Capitalized" Under Prompt Corrective Action Provisions
	Amount				Ratio			Amount				Ratio			Amount				Ratio
Leverage Capital Ratio:
Tier 1 capital	$	117,336			11.7	%		$	40,024			4.0	%		$	50,031			5.0	%
Risk-based Capital Ratios:
Common equity Tier 1 capital	117,336				16.7			31,539				4.5			45,557				6.5
Tier 1 capital	117,336				16.7			42,052				6.0			56,070				8.0
Total capital	126,109				18.0			56,070				8.0			70,087				10.0

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- Definition

Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1G
-URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958577-112826

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1H
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=117337116&loc=d3e65071-112826

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826

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