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v3.25.3

OREO and Other Repossessed Assets: Narrative (Details) $ in Thousands | Sep. 30, 2025 USD ($)
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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