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Deposits: Narrative (Details) - USD ($) | Sep. 30, 2025 | Sep. 30, 2024
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Deposits [Abstract] |  |
Time Deposits, $250,000 Or More | $ 142,813,000 | $ 113,579,000
Brokered deposits | 43,111,000 | 48,759,000
Reciprocal deposits | $ 87,493,000 | $ 93,464,000

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- References No definition available. + Details
Name: | tsbk_BrokeredDeposits
Namespace Prefix: | tsbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Reciprocal Deposit + References No definition available. + Details
Name: | tsbk_ReciprocalDeposit
Namespace Prefix: | tsbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Time Deposits, 250,000 Or More + References No definition available. + Details
Name: | tsbk_TimeDeposits250000OrMore
Namespace Prefix: | tsbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_DepositsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration