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Investment Securities: Other than Temporary Impairment, Credit Losses Recognized in Earnings (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward]
Beginning balance of credit loss	$ 803	$ 816
Net realized loss previously recorded as credit losses	2	0
Recapture of prior credit loss	(7)	(6)
Ending balance of credit loss	$ 798	$ 810

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- Definition

Other-Than-Temporary Impairment, Credit Losses Recognized In Earnings, Credit Losses On Held To Maturity Securities

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Other Than Temporary Impairment, Credit Losses Recognized In Earnings, Net Realized Gain (Loss)

+ References

No definition available.

+ Details

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Balance Type:	debit
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- Definition

Other-Than-Termporary Impairment, Credit Losses Recognized In Earnings, Reductions, Recapture On Securities Sold

+ References

No definition available.

+ Details

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

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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