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Loans Receivable And Allowance For Loan Losses: Schedule of Loans receivable and Loans held for sale (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015		Sep. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 77,433tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans		$ 68,479tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans
Total loans receivable	632,537tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGross		607,341tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGross
Undisbursed portion of construction loans in process	(35,990)us-gaap_LoansAndLeasesReceivableLoansInProcess		(29,416)us-gaap_LoansAndLeasesReceivableLoansInProcess
Deferred loan origination fees	(1,893)us-gaap_LoansAndLeasesReceivableDeferredIncome		(1,746)us-gaap_LoansAndLeasesReceivableDeferredIncome
Less: Allowance for loan losses	(10,382)us-gaap_LoansAndLeasesReceivableAllowance		(10,427)us-gaap_LoansAndLeasesReceivableAllowance
Total loans receivable, net	584,272us-gaap_LoansReceivableNet		565,752us-gaap_LoansReceivableNet
Ratio of loan category to total loans receivable (percent)	100.00%tsbk_LoansReceivableRatioOfLoanCategoryToTotalLoans		100.00%tsbk_LoansReceivableRatioOfLoanCategoryToTotalLoans
Total mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	558,697tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_MortgageLoansOnRealEstateMember		537,162tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_MortgageLoansOnRealEstateMember
Ratio of loan category to total loans receivable (percent)	88.30%tsbk_LoansReceivableRatioOfLoanCategoryToTotalLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_MortgageLoansOnRealEstateMember		88.50%tsbk_LoansReceivableRatioOfLoanCategoryToTotalLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_MortgageLoansOnRealEstateMember
Mortgage loans, one-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	107,821tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_MortgageLoansOneToFourFamilyMember	[1]	98,534tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_MortgageLoansOneToFourFamilyMember	[1]
Ratio of loan category to total loans receivable (percent)	17.10%tsbk_LoansReceivableRatioOfLoanCategoryToTotalLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_MortgageLoansOneToFourFamilyMember	[1]	16.20%tsbk_LoansReceivableRatioOfLoanCategoryToTotalLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_MortgageLoansOneToFourFamilyMember	[1]
Mortgage loans, multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	48,641tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_MortgageLoansMultiFamilyMember		46,206tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_MortgageLoansMultiFamilyMember
Ratio of loan category to total loans receivable (percent)	7.70%tsbk_LoansReceivableRatioOfLoanCategoryToTotalLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_MortgageLoansMultiFamilyMember		7.60%tsbk_LoansReceivableRatioOfLoanCategoryToTotalLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_MortgageLoansMultiFamilyMember
Mortgage loans, commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	296,338tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialMortgageBackedSecuritiesMember		294,354tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialMortgageBackedSecuritiesMember
Ratio of loan category to total loans receivable (percent)	46.80%tsbk_LoansReceivableRatioOfLoanCategoryToTotalLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialMortgageBackedSecuritiesMember		48.50%tsbk_LoansReceivableRatioOfLoanCategoryToTotalLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialMortgageBackedSecuritiesMember
Mortgage loans, construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	77,433tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_MortgageLoansConstructionAndLandDevelopmentMember		68,479tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_MortgageLoansConstructionAndLandDevelopmentMember
Ratio of loan category to total loans receivable (percent)	12.20%tsbk_LoansReceivableRatioOfLoanCategoryToTotalLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_MortgageLoansConstructionAndLandDevelopmentMember		11.30%tsbk_LoansReceivableRatioOfLoanCategoryToTotalLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_MortgageLoansConstructionAndLandDevelopmentMember
Mortgage loans, land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	28,464tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_MortgageLoansLandMember		29,589tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_MortgageLoansLandMember
Ratio of loan category to total loans receivable (percent)	4.50%tsbk_LoansReceivableRatioOfLoanCategoryToTotalLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_MortgageLoansLandMember		4.90%tsbk_LoansReceivableRatioOfLoanCategoryToTotalLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_MortgageLoansLandMember
Total consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	38,929tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerLoanMember		39,620tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerLoanMember
Ratio of loan category to total loans receivable (percent)	6.20%tsbk_LoansReceivableRatioOfLoanCategoryToTotalLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerLoanMember		6.50%tsbk_LoansReceivableRatioOfLoanCategoryToTotalLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerLoanMember
Consumer loans, home equity and second mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	34,362tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_ConsumerLoansHomeEquityAndSecondMortgageMember		34,921tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_ConsumerLoansHomeEquityAndSecondMortgageMember
Ratio of loan category to total loans receivable (percent)	5.40%tsbk_LoansReceivableRatioOfLoanCategoryToTotalLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_ConsumerLoansHomeEquityAndSecondMortgageMember		5.70%tsbk_LoansReceivableRatioOfLoanCategoryToTotalLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_ConsumerLoansHomeEquityAndSecondMortgageMember
Consumer loans, other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	4,567tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember		4,699tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember
Ratio of loan category to total loans receivable (percent)	0.80%tsbk_LoansReceivableRatioOfLoanCategoryToTotalLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember		0.80%tsbk_LoansReceivableRatioOfLoanCategoryToTotalLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember
Commercial business loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial business loans	$ 34,911tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossCommerical / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialLoanMember		$ 30,559tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossCommerical / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialLoanMember
Ratio of loan category to total loans receivable (percent)	5.50%tsbk_LoansReceivableRatioOfLoanCategoryToTotalLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialLoanMember		5.00%tsbk_LoansReceivableRatioOfLoanCategoryToTotalLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialLoanMember
[1] Includes loans held for sale.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans held for sale. Excludes loans and leases covered under loss sharing agreements.

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