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v3.23.1

Investment Securities: Schedule of significant inputs utilized to measure management's estimate of the credit loss component on OTTI securities (Details) | Mar. 31, 2023 | Mar. 31, 2022
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Minimum |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |
OTTI significant inputs - Constant prepayment rate | 6.00% | 6.00%
OTTI significant inputs - Collateral default rate | 0.00% | 0.53%
OTTI significant inputs - Loss severity rate | 0.00% | 0.00%
Maximum |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |
OTTI significant inputs - Constant prepayment rate | 15.00% | 15.00%
OTTI significant inputs - Collateral default rate | 19.63% | 21.55%
OTTI significant inputs - Loss severity rate | 3.17% | 8.53%
Weighted Average |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |
OTTI significant inputs - Constant prepayment rate | 7.38% | 8.37%
OTTI significant inputs - Collateral default rate | 10.56% | 10.53%
OTTI significant inputs - Loss severity rate | 1.04% | 3.72%

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- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
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Namespace Prefix: | tsbk_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
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Namespace Prefix: | tsbk_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
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Namespace Prefix: | tsbk_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_WeightedAverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |