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Investment Securities: Schedule of significant inputs utilized to measure management's estimate of the credit loss component on OTTI securities (Details) | Dec. 31, 2022 | Dec. 31, 2021
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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% | 1.56%
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 | 14.64% | 22.67%
OTTI significant inputs - Loss severity rate | 7.76% | 13.95%
Weighted Average |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |
OTTI significant inputs - Constant prepayment rate | 8.87% | 12.50%
OTTI significant inputs - Collateral default rate | 9.06% | 12.14%
OTTI significant inputs - Loss severity rate | 2.94% | 3.30%

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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_
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Balance Type: | na
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- Details
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Period Type: |

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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_WeightedAverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |