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Loans Receivable And Allowance For Loan Losses: COVID Modifications (Details) $ in Thousands | Sep. 30, 2021 USD ($) loan
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Accounts, Notes, Loans and Financing Receivable [Line Items] |
Ratio of loan category to total loans, modified for COVID | 100.00%
Number of commercial loans modified | loan | 1
Commercial loans modified for COVID | $ | $ 323
Mortgage loans, one-to-four family |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Number of mortgage loans modified | loan | 1
Mortgage loans modified for COVID | $ | $ 323
Ratio of loan category to total loans, modified for COVID | 100.00%

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- Definition Loans Receivable, Including Loans Held-For-Sale, Excluding Loans In Process And Deferred Fees, Gross, Commercial, Modified For COVID + References No definition available. + Details
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Namespace Prefix: | tsbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Loans Receivable, Including Loans Held-For-Sale, Excluding Loans in Process and Deferred Fees, Gross, Mortgage Loans, Modified For COVID + References No definition available. + Details
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Namespace Prefix: | tsbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Loans Receivable, Ratio of Loan Category to Total Loans, Modified For COVID + References No definition available. + Details
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Namespace Prefix: | tsbk_
Data Type: | dtr-types:percentItemType
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- Definition Number Of Commercial Loans Modified + References No definition available. + Details
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Namespace Prefix: | tsbk_
Data Type: | xbrli:integerItemType
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- Definition Number Of Mortgage Loans Modified + References No definition available. + Details
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Namespace Prefix: | tsbk_
Data Type: | xbrli:integerItemType
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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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |