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Commitments and Contingencies: Supply Commitment (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019
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Commitments and Contingencies Disclosure [Abstract] |  |
Undisbursed portion of construction loans in process | $ 100,558 | $ 92,226
Undisbursed lines of credit | 103,030 | 80,184
Commitments to extend credit | $ 38,581 | $ 16,578

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Period Type: | instant

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Namespace Prefix: | tsbk_
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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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