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Investment Securities: Other than Temporary Impairment, Credit Losses Recognized in Earnings (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] |  |  |
Beginning balance | $ 803 | $ 816 | $ 836
Net realized losses previously recorded as credit losses | (4) | (2) | (11)
Recovery of prior credit loss | (11) | (11) | (9)
Ending balance | $ 788 | $ 803 | $ 816

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- Definition Other-Than-Temporary Impairment, Credit Losses Recognized In Earnings, Credit Losses On Held To Maturity Securities + References No definition available. + Details
Name: | tsbk_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnHeldToMaturitySecurities
Namespace Prefix: | tsbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Other Than Temporary Impairment, Credit Losses Recognized In Earnings, Net Realized Gain (Loss) + References No definition available. + Details
Name: | tsbk_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsNetRealizedGainLoss
Namespace Prefix: | tsbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Other-Than-Termporary Impairment, Credit Losses Recognized In Earnings, Reductions, Recapture On Securities Sold + References No definition available. + Details
Name: | tsbk_OtherThanTermporaryImpairmentCreditLossesRecognizedInEarningsReductionsRecaptureOnSecuritiesSold
Namespace Prefix: | tsbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration