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Deposits: Narrative (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Deposits [Abstract] |  |
Time Deposits, $250,000 Or More | $ 29,211 | $ 18,164
Brokered deposits | $ 19,327 | $ 17,202

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