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v3.25.3

OREO and Other Repossessed Assets: Other Real Estate, Roll Forward (Details) $ in Thousands | 12 Months Ended
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Sep. 30, 2025 USD ($) property | Sep. 30, 2024 USD ($) property
OREO and Other Repossessed Assets |  |
OREO and Other Repossessed Assets, Amount, Starting Balance | $ | $ 0 | $ 0
Additions to OREO and other repossessed assets, amount | $ | 221 | 0
Sales of OREO and other repossessed assets, amount | $ | 0 | 0
OREO and Other Repossessed Assets, Amount, Ending Balance | $ | $ 221 | $ 0
Other Real Estate, Number Of Contracts [Roll Forward] |  |
OREO and Other Repossessed Assets, Number, Starting Balance | property | 1 | 2
Additions to OREO and other repossessed assets, number | property | 1 | 0
Sales of OREO and other repossessed assets, number | property | 0 | (1)
OREO and Other Repossessed Assets, Number, Ending Balance | property | 2 | 1

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- References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Additions To OREO And Other Repossessed Assets, Number + References No definition available. + Details
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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
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- Definition Disposition Of OREO And Other Repossessed Assets, Number + References No definition available. + Details
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Namespace Prefix: | tsbk_
Data Type: | xbrli:integerItemType
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- References No definition available. + Details
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Namespace Prefix: | tsbk_
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- Definition Other Real Estate, Number Of Contracts [Roll Forward] + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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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 -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details
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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
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