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Summary of Significant Accounting Policies - Allowance for Credit Losses (Details) - USD ($)	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Accounting Policies [Abstract]
Adjustment to opening balance	$ 461,000
Allowance for credit losses	18,091,000	$ 17,478,000	$ 15,817,000	$ 13,703,000
ACL on unfunded commitments	$ 432,000	$ 327,000	$ 332,000

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- Definition

Debt Securities, Held-to-Maturity, Allowance For Credit Loss, Excluding Accrued Interest, Adjustment

+ References

No definition available.

+ Details

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Balance Type:	credit
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- References

No definition available.

+ Details

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

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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

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- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

+ Details

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