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v3.23.3

OREO and Other Repossessed Assets: Other Real Estate, Roll Forward (Details) $ in Thousands | 12 Months Ended
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Sep. 30, 2023 USD ($) property | Sep. 30, 2022 USD ($) property
OREO and Other Repossessed Assets |  |
OREO and Other Repossessed Assets, Amount, Starting Balance | $ | $ 0 | $ 157
Sales of OREO and other repossessed assets, amount | $ | 0 | (157)
OREO and Other Repossessed Assets, Amount, Ending Balance | $ | $ 0 | $ 0
Other Real Estate, Number Of Contracts [Roll Forward] |  |
OREO and Other Repossessed Assets, Number, Starting Balance | property | 2 | 3
Sales of OREO and other repossessed assets, number | property | 0 | (1)
OREO and Other Repossessed Assets, Number, Ending Balance | property | 2 | 2

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- Definition Disposition Of OREO And Other Repossessed Assets, Amount + References No definition available. + Details
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Namespace Prefix: | tsbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Disposition Of OREO And Other Repossessed Assets, Number + References No definition available. + Details
Name: | tsbk_DispositionOfOREOAndOtherRepossessedAssetsNumber
Namespace Prefix: | tsbk_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | tsbk_OREOandOtherRepossessedAssetsNumber
Namespace Prefix: | tsbk_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Other Real Estate, Number Of Contracts [Roll Forward] + References No definition available. + Details
Name: | tsbk_OtherRealEstateNumberOfContractsRollForward
Namespace Prefix: | tsbk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Carrying amount as of the balance sheet date of other real estate and foreclosed assets. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(4)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
Name: | us-gaap_OtherRealEstateAndForeclosedAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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