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Commitments and Contingencies: Supply Commitment (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013
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Commitments and Contingencies Disclosure [Abstract] |  |
Undisbursed portion of construction loans in process | $ 29,416 | $ 18,527
Undisbursed lines of credit | 30,678 | 25,187
Commitments to extend credit | $ 18,119 | $ 16,399

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- Definition No authoritative reference available. + References No definition available. + Details
Name: | tsbk_CommitmentsToExtendCredit
Namespace Prefix: | tsbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition No authoritative reference available. + References No definition available. + Details
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Namespace Prefix: | tsbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition No authoritative reference available. + References No definition available. + Details
Name: | tsbk_UndisbursedPortionOfConstructionLoansInProcess
Namespace Prefix: | tsbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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