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Commitment and Contingencies - Schedule of Allowance for Credit Losses for Unfunded Loan Commitments (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Off-Balance-Sheet, Credit Loss, Liability [Roll Forward]
Beginning ACL	$ 327	$ 332
Provision for (recapture of) credit losses	105	(71)
Ending ACL	432	327
Impact of Adopting CECL (ASU 2016-13)
Off-Balance-Sheet, Credit Loss, Liability [Roll Forward]
Beginning ACL	$ 0	66
Ending ACL		$ 0

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- Definition

Provision for Loan, Lease, and Other Losses, Unfunded Commitment

+ References

No definition available.

+ Details

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Namespace Prefix:	tsbk_
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Balance Type:	debit
Period Type:	duration

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- Definition

Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482454/460-10-45-1

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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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