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Deposits: Narrative (Details) - USD ($)	Sep. 30, 2025	Sep. 30, 2024
Deposits [Abstract]
Time Deposits, $250,000 Or More	$ 142,813,000	$ 113,579,000
Brokered deposits	43,111,000	48,759,000
Reciprocal deposits	$ 87,493,000	$ 93,464,000

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- References

No definition available.

+ Details

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

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- Definition

Reciprocal Deposit

+ References

No definition available.

+ Details

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

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- Definition

Time Deposits, 250,000 Or More

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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