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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
Dec. 31, 2014
Sep. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage loans $ 69,235tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans $ 68,479tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans
Total loans receivable 614,589tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGross 607,341tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGross
Undisbursed portion of construction loans in process (28,832)us-gaap_LoansAndLeasesReceivableLoansInProcess (29,416)us-gaap_LoansAndLeasesReceivableLoansInProcess
Deferred loan origination fees (1,840)us-gaap_LoansAndLeasesReceivableDeferredIncome (1,746)us-gaap_LoansAndLeasesReceivableDeferredIncome
Less: Allowance for loan losses (10,322)us-gaap_LoansAndLeasesReceivableAllowance (10,427)us-gaap_LoansAndLeasesReceivableAllowance
Total loans receivable, net 573,595us-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 541,425tsbk_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) 88.10%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 103,021tsbk_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) 16.70%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 45,423tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansMultiFamilyMember		 46,206tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansMultiFamilyMember
Ratio of loan category to total loans receivable (percent) 7.40%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 295,113tsbk_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) 48.00%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 69,235tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansConstructionAndLandDevelopmentMember		 68,479tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansConstructionAndLandDevelopmentMember
Ratio of loan category to total loans receivable (percent) 11.30%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 28,633tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansLandMember		 29,589tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansLandMember
Ratio of loan category to total loans receivable (percent) 4.70%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 40,207tsbk_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) 6.50%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 35,754tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConsumerLoansHomeEquityAndSecondMortgageMember		 34,921tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConsumerLoansHomeEquityAndSecondMortgageMember
Ratio of loan category to total loans receivable (percent) 5.80%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 4,453tsbk_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) 0.70%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 $ 32,957tsbk_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) 5.40%tsbk_LoansReceivableRatioOfLoanCategoryToTotalLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember		 5.00%tsbk_LoansReceivableRatioOfLoanCategoryToTotalLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
[1] Includes loans held for sale.