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Commitments and Contingencies: Supply Commitment (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Mar. 31, 2024
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Commitments and Contingencies Disclosure [Abstract] |  |
Undisbursed portion of construction loans in process (see Note 4) | $ 75,042 | $ 77,502
Undisbursed lines of credit | 117,220 | 135,883
Commitments to extend credit | 27,954 | 19,106
Total commitments | $ 220,216 | $ 232,491

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

X
- References No definition available. + Details
Name: | tsbk_UndisbursedLinesOfCredit
Namespace Prefix: | tsbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
Name: | us-gaap_OtherCommitment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant