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Investment Securities: Other than Temporary Impairment, Credit Losses Recognized in Earnings (Details) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Beginning balance of credit loss	$ 816	$ 836
Net realized loss previously recorded as credit losses	(1)	(10)
Recapture of prior credit loss	(9)	(7)
Ending balance of credit loss	$ 806	$ 819

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- Definition

Amount of accumulated credit loss recognized in earnings for debt security held for which portion of other-than-temporary impairment (OTTI) was recognized in other comprehensive income (OCI).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-8B

Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8B
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-8B

+ Details

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Period Type:	instant

X

- Definition

Amount of decrease in accumulated credit loss recognized in earnings for other-than-temporary impairment (OTTI) of debt security from sale of impaired security.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8B
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-8B

+ Details

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Balance Type:	credit
Period Type:	duration

X

- 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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