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Investment Securities: Other than Temporary Impairment, Credit Losses Recognized in Earnings (Details) - USD ($) $ in Thousands | 6 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance of credit loss | $ 803 | $ 816
Net realized loss previously recorded as credit losses | 2 | 0
Recapture of prior credit loss | (7) | (6)
Ending balance of credit loss | $ 798 | $ 810

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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_DebtSecuritiesHeldToMaturityAllowanceForCreditLossRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration