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Commitments and Contingencies: Supply Commitment (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Sep. 30, 2024
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Commitments and Contingencies Disclosure [Abstract] |  |
Undisbursed portion of construction loans in process (see Note 4) | $ 88,289 | $ 69,878
Undisbursed lines of credit | 129,536 | 119,858
Commitments to extend credit | $ 30,888 | $ 26,293

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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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