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Commitments and Contingencies: Supply Commitment (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016
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Commitments and Contingencies Disclosure [Abstract] |  |
Undisbursed portion of construction loans in process | $ 82,411 | $ 48,627
Undisbursed lines of credit | 51,420 | 47,949
Commitments to extend credit | $ 19,673 | $ 20,681

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- 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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Namespace Prefix: | tsbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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Namespace Prefix: | tsbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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