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Deposits: Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Deposits [Abstract]
Time Deposits, $250,000 Or More	$ 28,945	$ 29,211
Brokered deposits	$ 11,303	$ 19,327

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- References

No definition available.

+ Details

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

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- Definition

Time Deposits, 250,000 Or More

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No definition available.

+ Details

Name:	tsbk_TimeDeposits250000OrMore
Namespace Prefix:	tsbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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No definition available.

+ Details

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