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Investment Securities: Schedule of Other than Temporary Impairments (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Held to Maturity
Net recoveries on investment securities	$ 12	$ 9	$ 22

X

- Definition

Other than Temporary Impairment Losses (Recoveries), Investments, Portion Recognized in Earnings, Net

+ References

No definition available.

+ Details

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Namespace Prefix:	tsbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

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