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OREO and Other Repossessed Assets: Narrative (Details) $ in Thousands	Sep. 30, 2025 USD ($)
Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract]
Recorded amount of foreclosed residential real estate properties held in OREO	$ 221

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- Definition

Other Real Estate Owned, Foreclosed Residential Real Estate Properties, Amount

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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