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Investment Securities: Schedule of Other than Temporary Impairments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Held to Maturity |  |  |
Net recoveries on investment securities | $ 9 | $ 22 | $ 20

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- Definition Other than Temporary Impairment Losses (Recoveries), Investments, Portion Recognized in Earnings, Net + References No definition available. + Details
Name: | tsbk_OtherthanTemporaryImpairmentLossesRecoveriesInvestmentsPortionRecognizedinEarningsNet
Namespace Prefix: | tsbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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