XML 53 R39.htm IDEA: XBRL DOCUMENT
v3.25.3

Investment Securities (Tables) | 12 Months Ended
--- | ---
Sep. 30, 2025
Investments [Abstract] |
Marketable Securities | Held to maturity and available for sale investment securities were as follows as of September 30, 2025 and 2024 (dollars in thousands):
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value |  | ACL
September 30, 2025 |  |  |  |  |  |  |  |  |
Held to Maturity |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agency securities | $ | 69,646 |  |  | $ | 15 |  |  | $ | (2,760) |  |  | $ | 66,901 |  |  | $ | — |
Mortgage-backed securities ("MBS"): |  |  |  |  |  |  |  |  |
U.S. government agencies | 48,735 |  |  | 199 |  |  | (1,357) |  |  | 47,577 |  |  | — |
Private label residential | 17,376 |  |  | 196 |  |  | (822) |  |  | 16,750 |  |  | 35 |
Municipal securities | 605 |  |  | 6 |  |  | — |  |  | 611 |  |  | — |
Bank issued trust preferred securities | 499 |  |  | — |  |  | (4) |  |  | 495 |  |  | 1 |
Total | $ | 136,861 |  |  | $ | 416 |  |  | $ | (4,943) |  |  | $ | 132,334 |  |  | $ | 36 |
Available for Sale |  |  |  |  |  |  |  |  |
U.S. government securities | $ | 4,968 |  |  | $ | — |  |  | $ | — |  |  | $ | 4,968 |  |  |
MBS: U.S. government agencies | 73,649 |  |  | 382 |  |  | (759) |  |  | 73,272 |  |  |
Total | $ | 78,617 |  |  | $ | 382 |  |  | $ | (759) |  |  | $ | 78,240 |  |  |
September 30, 2024 |  |  |  |  |  |  |  |  |
Held to Maturity |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agency securities | $ | 92,312 |  |  | $ | 70 |  |  | $ | (4,197) |  |  | $ | 88,185 |  |  | $ | — |
MBS: |  |  |  |  |  |  |  |  |
U.S. government agencies | 49,481 |  |  | 174 |  |  | (1,378) |  |  | 48,277 |  |  | — |
Private label residential | 28,479 |  |  | 231 |  |  | (980) |  |  | 27,730 |  |  | 55 |
Municipal securities | 1,330 |  |  | 8 |  |  | — |  |  | 1,338 |  |  | — |
Bank issued trust preferred securities | 495 |  |  | — |  |  | (18) |  |  | 477 |  |  | 5 |
Total | $ | 172,097 |  |  | $ | 483 |  |  | $ | (6,573) |  |  | $ | 166,007 |  |  | $ | 60 |
Available for Sale |  |  |  |  |  |  |  |  |
U.S. government securities | $ | 3,934 |  |  | $ | 6 |  |  | $ | (1) |  |  | $ | 3,939 |  |  |
MBS: U.S. government agencies | 68,297 |  |  | 545 |  |  | (524) |  |  | 68,318 |  |  |
Total | $ | 72,231 |  |  | $ | 551 |  |  | $ | (525) |  |  | $ | 72,257 |  |  |
Debt Securities, Unrealized Loss Position, Fair Value | Held to maturity and available for sale investment securities with unrealized losses were as follows as of September 30, 2025 (dollars in thousands):
| Less Than 12 Months |  | 12 Months or Longer |  | Total
| Estimated Fair Value |  | Gross Unrealized Losses |  | Qty |  | Estimated Fair Value |  | Gross Unrealized Losses |  | Qty |  | Estimated Fair Value |  | Gross Unrealized Losses
Held to Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agency securities | $ | — |  |  | $ | — |  |  | — |  |  | $ | 56,960 |  |  | $ | (2,760) |  |  | 14 |  |  | $ | 56,960 |  |  | $ | (2,760) |
MBS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agencies | 7 |  |  | — |  |  | 1 |  |  | 27,776 |  |  | (1,357) |  |  | 42 |  |  | 27,783 |  |  | (1,357) |
Private label residential | 341 |  |  | (2) |  |  | 3 |  |  | 14,646 |  |  | (820) |  |  | 14 |  |  | 14,987 |  |  | (822) |
Bank issued trust preferred securities | 495 |  |  | (4) |  |  | 1 |  |  | — |  |  | — |  |  | — |  |  | 495 |  |  | (4) |
Total | $ | 843 |  |  | $ | (6) |  |  | 5 |  |  | $ | 99,382 |  |  | $ | (4,937) |  |  | 70 |  |  | $ | 100,225 |  |  | $ | (4,943) |
Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government securities | $ | 3,977 |  |  | $ | — |  |  | 1 |  |  | $ | — |  |  | $ | — |  |  | — |  |  | $ | 3,977 |  |  | $ | — |
MBS: U.S. government agencies | 11,922 |  |  | (67) |  |  | 3 |  |  | 28,947 |  |  | (692) |  |  | 24 |  |  | 40,869 |  |  | (759) |
Total | $ | 15,899 |  |  | $ | (67) |  |  | 4 |  | $ | 28,947 |  |  | $ | (692) |  |  | 24 |  |  | $ | 44,846 |  |  | $ | (759) |
Held to maturity and available for sale investment securities with unrealized losses were as follows as of September 30, 2024 (dollars in thousands):
| Less Than 12 Months |  | 12 Months or Longer |  | Total
| Estimated Fair Value |  | Gross Unrealized Losses |  | Qty |  | Estimated Fair Value |  | Gross Unrealized Losses |  | Qty |  | Estimated Fair Value |  | Gross Unrealized Losses
Held to Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agency securities | $ | — |  |  | $ | — |  |  | — |  |  | $ | 78,363 |  |  | $ | (4,197) |  |  | 17 |  |  | $ | 78,363 |  |  | $ | (4,197) |
MBS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agencies | 1 |  |  | — |  |  | 1 |  |  | 28,618 |  |  | (1,378) |  |  | 44 |  |  | 28,619 |  |  | (1,378) |
Private label residential | 804 |  |  | (6) |  |  | 1 |  |  | 20,447 |  |  | (974) |  |  | 19 |  |  | 21,251 |  |  | (980) |
Bank issued trust preferred securities | — |  |  | — |  |  | — |  |  | 477 |  |  | (18) |  |  | 1 |  |  | 477 |  |  | (18) |
Total | $ | 805 |  |  | $ | (6) |  |  | 2 |  |  | $ | 127,905 |  |  | $ | (6,567) |  |  | 81 |  |  | $ | 128,710 |  |  | $ | (6,573) |
Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government securities | $ | 1,962 |  |  | $ | (1) |  |  | 1 |  |  | $ | — |  |  | $ | — |  |  | — |  |  | $ | 1,962 |  |  | $ | (1) |
MBS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agencies | 11,368 |  |  | (117) |  |  | 4 |  |  | 25,751 |  |  | (407) |  |  | 23 |  |  | 37,119 |  |  | (524) |
Total | $ | 13,330 |  |  | $ | (118) |  |  | 5 |  |  | $ | 25,751 |  |  | $ | (407) |  |  | 23 |  |  | $ | 39,081 |  |  | $ | (525) |
Schedule of Contractual Maturities of Debt Securities | The contractual maturities of debt securities at September 30, 2025 are as follows (dollars in thousands). Expected maturities may differ from scheduled maturities due to the prepayment of principal or call provisions.
| Held to Maturity |  | Available for Sale
| Amortized Cost |  | Estimated Fair Value |  | Amortized Cost |  | Estimated Fair Value
Due within one year | $ | 24,152 |  |  | $ | 23,898 |  |  | $ | 7,091 |  |  | $ | 7,092 |
Due after one year to five years | 56,882 |  |  | 54,352 |  |  | 3,780 |  |  | 3,772 |
Due after five years to ten years | 134 |  |  | 233 |  |  | 194 |  |  | 193 |
Due after ten years | 55,693 |  |  | 53,851 |  |  | 67,552 |  |  | 67,183 |
Total | $ | 136,861 |  |  | $ | 132,334 |  |  | $ | 78,617 |  |  | $ | 78,240 |
Summary of Credit Loss by Portfolio Segment | The following tables set forth information for the years ended September 30, 2025 and 2024 regarding activity in the ACL by portfolio segment (dollars in thousands):
|  | Year Ended September 30, 2025
Held to Maturity |  | Beginning Allowance |  |  |  | Provision for (Recapture of ) Credit Losses |  | Ending Allowance
MBS: |  |  |  |  |  |  |  |
Private label residential |  | $ | 55 |  |  |  |  | $ | (20) |  |  | $ | 35 |
Bank issued trust preferred securities |  | 5 |  |  |  |  | (4) |  |  | 1 |
Total |  | $ | 60 |  |  |  |  | $ | (24) |  |  | $ | 36 |
|  | Year Ended September 30, 2024
Held to Maturity |  | Beginning Allowance |  | Impact of Adopting CECL (ASU 2016-13) |  | Provision for (Recapture of ) Credit Losses |  | Ending Allowance
MBS: |  |  |  |  |  |  |  |
Private label residential |  | $ | — |  |  | $ | 82 |  |  | $ | (27) |  |  | $ | 55 |
Bank issued trust preferred securities |  | — |  |  | 10 |  |  | (5) |  |  | $ | 5 |
Total |  | $ | — |  |  | $ | 92 |  |  | $ | (32) |  |  | $ | 60 |
The following table represents a roll forward of the credit loss component of held to maturity investment securities that have been written down for OTTI with the credit loss component recognized in earning for the years ended September 30, 2025, 2024 and 2023 (dollars in thousands):
| 2025 |  | 2024 |  | 2023
Balance, beginning of year | $ | 803 |  |  | $ | 816 |  |  | $ | 836 |
Subtractions: |  |  |  |  |
Net realized losses previously recorded as credit losses | (4) |  |  | (2) |  |  | (11) |
Recovery of prior credit loss | (11) |  |  | (11) |  |  | (9) |
Balance, end of year | $ | 788 |  |  | $ | 803 |  |  | $ | 816 |
Summary of Held to Maturity Investment Securities by Risk | The following tables set forth the Company's held to maturity investment securities at September 30, 2025 and 2024 by credit quality indicator (dollars in thousands):
| Credit Ratings
As of September 30, 2025 | AAA/AA/A |  | BBB/BB/B |  | Unrated |  | Total
Held to Maturity |  |  |  |  |  |  |
U.S. Treasury and U.S. government agency securities | $ | 69,646 |  |  | $ | — |  |  | $ | — |  |  | $ | 69,646 |
MBS: |  |  |  |  |  |  |
U.S. government agencies | 48,735 |  |  | — |  |  | — |  |  | 48,735 |
Private label securities | 12,455 |  |  | — |  |  | 4,921 |  |  | 17,376 |
Municipal securities | 605 |  |  | — |  |  | — |  |  | 605 |
Bank issued trust preferred securities | — |  |  | — |  |  | 499 |  |  | 499 |
Total held to maturity | $ | 131,441 |  |  | $ | — |  |  | $ | 5,420 |  |  | $ | 136,861 |
| Credit Ratings
As of September 30, 2024 | AAA/AA/A |  | BBB/BB/B |  | Unrated |  | Total
Held to Maturity |  |  |  |  |  |  |
U.S. Treasury and U.S. government agency securities | $ | 92,312 |  |  | $ | — |  |  | $ | — |  |  | $ | 92,312 |
MBS: |  |  |  |  |  |  |
U.S. government agencies | 49,481 |  |  | — |  |  | — |  |  | 49,481 |
Private label securities | 16,277 |  |  | — |  |  | 12,202 |  |  | 28,479 |
Municipal securities | 1,230 |  |  | — |  |  | 100 |  |  | 1,330 |
Bank issued trust preferred securities | — |  |  | — |  |  | 495 |  |  | 495 |
Total held to maturity | $ | 159,300 |  |  | $ | — |  |  | $ | 12,797 |  |  | $ | 172,097 |

X
- Definition Debt Securities, Unrealized Loss Position, Fair Value + References No definition available. + Details
Name: | tsbk_DebtSecuritiesUnrealizedLossPositionFairValueTableTextBlock
Namespace Prefix: | tsbk_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
Name: | tsbk_ScheduleOfContractualMaturitiesOfDebtSecuritiesTableTextBlock
Namespace Prefix: | tsbk_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure 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 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
Name: | us-gaap_DebtSecuritiesHeldToMaturityAllowanceForCreditLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of credit quality indicator for 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 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-5 + Details
Name: | us-gaap_DebtSecuritiesHeldToMaturityCreditQualityIndicatorTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
Name: | us-gaap_MarketableSecuritiesTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration