XML 118 R105.htm IDEA: XBRL DOCUMENT
v3.20.2

Employee Stock Ownership and 401(k) Plan: Narrative (Details) $ in Thousands | 1 Months Ended | 12 Months Ended | 156 Months Ended
--- | --- | --- | ---
Jan. 31, 1998 USD ($) shares | Sep. 30, 2020 USD ($) component | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2020 shares
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |  |  |
Earned ESOP shares |  | $ 31 | $ 441 | $ 882 |
401(k) |  |  |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |  |  |
401(k), employer safe harbor contribution (as a percent) |  | 3.00% |  |  |
401(k), employer contributions |  | $ 908 | 743 | 379 |
KSOP |  |  |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |  |  |
Number of components in KSOP | component |  | 2 |  |  |
Required service period (in years) |  | 1 year |  |  |
Employee minimum age requirement (in years) |  | 18 years |  |  |
Award vesting period (in years) |  | 6 years |  |  |
ESOP |  |  |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |  |  |
ESOP, loan borrowed from employer | $ 7,930 |  |  |  |
ESOP, shares purchased for plan (in shares) | shares | 1,058,000 |  |  |  |
ESOP, interest rate on employer loan (as a percent) |  | 8.50% |  |  |
ESOP, interest expense on employer loan |  |  | 9 | 53 |
Dividends used for debt service |  |  | 176 | 291 |
ESOP, shares distributed to participants (in shares) | shares |  |  |  |  | 642,302
ESOP, fair value of unallocated shares |  |  |  | 551 |
Earned ESOP shares |  |  | $ 318 | $ 823 |

X
- Definition Employee Stock Ownership Plan (ESOP), Debt Structure, Employer Loan, Amount + References No definition available. + Details
Name: | tsbk_EmployeeStockOwnershipPlanESOPDebtStructureEmployerLoanAmount
Namespace Prefix: | tsbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Employee Stock Ownership Plan (ESOP), Debt Structure, Employer Loan, Interest Expense + References No definition available. + Details
Name: | tsbk_EmployeeStockOwnershipPlanESOPDebtStructureEmployerLoanInterestExpense
Namespace Prefix: | tsbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Employee Stock Ownership Plan (ESOP), Debt Structure, Employer Loan, Interest Rate + References No definition available. + Details
Name: | tsbk_EmployeeStockOwnershipPlanESOPDebtStructureEmployerLoanInterestRate
Namespace Prefix: | tsbk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Employee Stock Ownership Plan (ESOP), Shares Distributed to Participants + References No definition available. + Details
Name: | tsbk_EmployeeStockOwnershipPlanESOPSharesDistributedtoParticipants
Namespace Prefix: | tsbk_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Components to Postretirement Plan + References No definition available. + Details
Name: | tsbk_NumberofComponentstoPostretirementPlan
Namespace Prefix: | tsbk_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share-based Compensation Arrangement by Share-based Payment Award, Employee Minimum Age Requirement + References No definition available. + Details
Name: | tsbk_SharebasedCompensationArrangementbySharebasedPaymentAwardEmployeeMinimumAgeRequirement
Namespace Prefix: | tsbk_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of plan compensation cost recognized during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929 + Details
Name: | us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of cash provided by the employer through contributions or dividends that the ESOP used in the period to repay debt and interest on a third-party loan made directly to the ESOP. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 25 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109244457&loc=d3e16545-113920 + Details
Name: | us-gaap_EmployeeStockOwnershipPlanESOPDebtStructureDirectLoanEmployerCashPaymentsUsedForDebtService
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Fair value of unearned shares held by the employee stock ownership plan (ESOP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929 + Details
Name: | us-gaap_EmployeeStockOwnershipPlanESOPDeferredSharesFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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 No definition available. + Details
Name: | us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares purchased for issuance under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=tsbk_TimberlandBankEmployeeStockOwnershipAnd401KPlanKSOPMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=tsbk_EmployeeStockOwnershipPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |