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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) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |
Net recoveries on investment securities | $ (8) | $ (5)
Held-to-maturity Securities |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |
Recoveries (other than temporary impairment OTTI) on investment securities | 8 | 5
Net recoveries on investment securities | $ 8 | $ 5
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 | 1.56% | 1.50%
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 | 22.67% | 23.73%
OTTI significant inputs - Loss severity rate | 13.95% | 10.07%
Weighted Average |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |
OTTI significant inputs - Constant prepayment rate | 12.50% | 9.23%
OTTI significant inputs - Collateral default rate | 12.14% | 13.58%
OTTI significant inputs - Loss severity rate | 3.30% | 3.44%

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- Definition Marketable Securities, Realized Losses (Recoveries), Other than Temporary Impairments, Amount + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
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- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
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- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
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- Definition Other than Temporary Impairment Losses (Recoveries), Investments, Portion Recognized in Earnings, Net + References No definition available. + Details
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Namespace Prefix: | tsbk_
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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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- Details
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- Details
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- Details
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