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Fair Value Measurements: Fair Value Measurements, Nonrecurring, Valuation Techniques (Details) $ in Thousands	Mar. 31, 2025 USD ($)	Sep. 30, 2024 USD ($)
Fair Value, Inputs, Level 3 | Valuation, Market Approach | Appraised value less estimated selling costs
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Individually evaluated collateral-dependent loans, measurement input	0.08	0.08
Fair Value, Inputs, Level 3 | Valuation, Market Approach | Lower of appraised value or listing price less estimated selling costs
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
OREO and other repossessed assets, measurement input	0.08	0.08
Nonrecurring
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Assets, estimated fair value, nonrecurring	$ 1,178	$ 1,315
Nonrecurring | Fair Value, Inputs, Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Assets, estimated fair value, nonrecurring	$ 1,178	$ 1,315

X

- Definition

Loans, Individually Evaluated Collateral-Dependent, Measurement Input

+ References

No definition available.

+ Details

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Namespace Prefix:	tsbk_
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Balance Type:	na
Period Type:	instant

X

- Definition

Other Real Estate Owned And Repossessed Assets, Measurement Input

+ References

No definition available.

+ Details

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Namespace Prefix:	tsbk_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Fair value portion of asset recognized for present right to economic benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 100
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-100

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-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 30
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-30

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
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-Paragraph 31
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-31

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-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-32

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- Details

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- Details

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- Details

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- Details

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