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Loans Receivable And Allowance For Loan Losses: Schedule of Composition of Construction and Land Development Loan Portfolio (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total construction and land development loans, amount	$ 69,235tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans	$ 68,479tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans
Total construction and land development loans, percent	100.00%tsbk_LoansReceivableRatioOfLoanCategoryToTotalConstructionAndLandDevelopmentLoans	100.00%tsbk_LoansReceivableRatioOfLoanCategoryToTotalConstructionAndLandDevelopmentLoans
Mortgage loans, construction - custom and owner/builder
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total construction and land development loans, amount	62,548tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_ConstructionCustomAndOwnerbuilderMember	59,752tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_ConstructionCustomAndOwnerbuilderMember
Total construction and land development loans, percent	90.30%tsbk_LoansReceivableRatioOfLoanCategoryToTotalConstructionAndLandDevelopmentLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_ConstructionCustomAndOwnerbuilderMember	87.30%tsbk_LoansReceivableRatioOfLoanCategoryToTotalConstructionAndLandDevelopmentLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_ConstructionCustomAndOwnerbuilderMember
Mortgage loans, construction - speculative one-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total construction and land development loans, amount	2,287tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_ConstructionSpeculativeOneToFourFamilyMember	2,577tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_ConstructionSpeculativeOneToFourFamilyMember
Total construction and land development loans, percent	3.30%tsbk_LoansReceivableRatioOfLoanCategoryToTotalConstructionAndLandDevelopmentLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_ConstructionSpeculativeOneToFourFamilyMember	3.80%tsbk_LoansReceivableRatioOfLoanCategoryToTotalConstructionAndLandDevelopmentLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_ConstructionSpeculativeOneToFourFamilyMember
Construction - Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total construction and land development loans, amount	1,560tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember	3,310tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember
Total construction and land development loans, percent	2.30%tsbk_LoansReceivableRatioOfLoanCategoryToTotalConstructionAndLandDevelopmentLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember	4.80%tsbk_LoansReceivableRatioOfLoanCategoryToTotalConstructionAndLandDevelopmentLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember
Mortgage loans, construction - Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total construction and land development loans, amount	$ 2,840tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_ConstructionMultiFamilyMember	$ 2,840tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_ConstructionMultiFamilyMember
Total construction and land development loans, percent	4.10%tsbk_LoansReceivableRatioOfLoanCategoryToTotalConstructionAndLandDevelopmentLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_ConstructionMultiFamilyMember	4.10%tsbk_LoansReceivableRatioOfLoanCategoryToTotalConstructionAndLandDevelopmentLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_ConstructionMultiFamilyMember

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