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Commitments and Contingencies: Supply Commitment (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Undisbursed portion of construction loans in process	$ 100,558	$ 92,226
Undisbursed lines of credit	103,030	80,184
Commitments to extend credit	$ 38,581	$ 16,578

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- References

No definition available.

+ Details

Name:	tsbk_CommitmentsToExtendCredit
Namespace Prefix:	tsbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	tsbk_UndisbursedLinesOfCredit
Namespace Prefix:	tsbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	tsbk_UndisbursedPortionOfConstructionLoansInProcess
Namespace Prefix:	tsbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

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Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration