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Deposits: Narrative (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Sep. 30, 2021
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Deposits [Abstract] |  |
Time Deposits, $250,000 Or More | $ 21,830 | $ 21,781
Brokered deposits | $ 4,617 | $ 11,383

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

X
- 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

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