XML 48 R38.htm IDEA: XBRL DOCUMENT
v3.25.2

Investment Securities: Credit Loss by Portfolio Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning Allowance | $ 50 | $ 85 | $ 60 | $ 0
Provision for (Recapture of) Credit Losses | (4) | (13) | (14) | (20)
Ending Allowance | 46 | 72 | 46 | 72
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning Allowance |  |  |  | 92
Private label residential |  |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning Allowance | 48 | 77 | 55 | 0
Provision for (Recapture of) Credit Losses | (3) | (11) | (10) | (16)
Ending Allowance | 45 | 66 | 45 | 66
Private label residential | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning Allowance |  |  |  | 82
Bank issued trust preferred securities |  |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning Allowance | 2 | 8 | 5 | 0
Provision for (Recapture of) Credit Losses | (1) | (2) | (4) | (4)
Ending Allowance | $ 1 | $ 6 | $ 1 | 6
Bank issued trust preferred securities | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning Allowance |  |  |  | $ 10

X
- Definition Debt Securities, Held-to-Maturity, Excluding Accrued Interest, Provision for (Recapture of) Credit Losses + References No definition available. + Details
Name: | tsbk_DebtSecuritiesHeldToMaturityExcludingAccruedInterestProvisionForRecaptureOfCreditLosses
Namespace Prefix: | tsbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, excluding accrued interest, of allowance for credit loss on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 + Details
Name: | us-gaap_DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
Name: | us-gaap_DebtSecuritiesHeldtomaturityAllowanceForCreditLossLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_CumulativeEffectPeriodOfAdoptionAxis=srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_ResidentialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |