XML 49 R39.htm IDEA: XBRL DOCUMENT
v3.25.2

Investment Securities: Held-to-Maturity Investment Securities by Risk (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Total held to maturity | $ 141,570 | $ 172,097
U.S. Treasury and U.S. government agency securities |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Total held to maturity | 69,559 | 92,312
U.S. government agencies |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Total held to maturity | 50,685 | 49,481
Private label residential |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Total held to maturity | 20,222 | 28,479
Municipal securities |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Total held to maturity | 605 | 1,330
Bank issued trust preferred securities |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Total held to maturity | 499 | 495
AAA/AA/A |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Total held to maturity | 134,654 | 159,300
AAA/AA/A | U.S. Treasury and U.S. government agency securities |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Total held to maturity | 69,559 | 92,312
AAA/AA/A | U.S. government agencies |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Total held to maturity | 50,685 | 49,481
AAA/AA/A | Private label residential |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Total held to maturity | 13,805 | 16,277
AAA/AA/A | Municipal securities |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Total held to maturity | 605 | 1,230
AAA/AA/A | Bank issued trust preferred securities |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Total held to maturity | 0 | 0
BBB/BB/B |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Total held to maturity | 0 | 0
BBB/BB/B | U.S. Treasury and U.S. government agency securities |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Total held to maturity | 0 | 0
BBB/BB/B | U.S. government agencies |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Total held to maturity | 0 | 0
BBB/BB/B | Private label residential |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Total held to maturity | 0 | 0
BBB/BB/B | Municipal securities |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Total held to maturity | 0 | 0
BBB/BB/B | Bank issued trust preferred securities |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Total held to maturity | 0 | 0
Unrated |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Total held to maturity | 6,916 | 12,797
Unrated | U.S. Treasury and U.S. government agency securities |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Total held to maturity | 0 | 0
Unrated | U.S. government agencies |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Total held to maturity | 0 | 0
Unrated | Private label residential |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Total held to maturity | 6,417 | 12,202
Unrated | Municipal securities |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Total held to maturity | 0 | 100
Unrated | Bank issued trust preferred securities |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Total held to maturity | $ 499 | $ 495

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 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-5 + Details
Name: | us-gaap_DebtSecuritiesHeldToMaturityCreditQualityIndicatorLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount excluding accrued interest, before allowance for credit loss, of 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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-5 + Details
Name: | us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestBeforeAllowanceForCreditLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

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

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_MunicipalBondsMember
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: |

X
- Details
Name: | srt_CreditRatingMoodysAxis=tsbk_MoodysARatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CreditRatingMoodysAxis=tsbk_MoodysBRatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CreditRatingMoodysAxis=tsbk_NotRatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |