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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 | Mar. 31, 2015 | Sep. 30, 2014
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total construction and land development loans, amount | $ 77,433 tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans | $ 68,479 tsbk_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 | 60,889 tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_ConstructionCustomAndOwnerbuilderMember | 59,752 tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_ConstructionCustomAndOwnerbuilderMember
Total construction and land development loans, percent | 78.60%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 | 2,769 tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_ConstructionSpeculativeOneToFourFamilyMember | 2,577 tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_ConstructionSpeculativeOneToFourFamilyMember
Total construction and land development loans, percent | 3.60%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 | 3,395 tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember | 3,310 tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember
Total construction and land development loans, percent | 4.40%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 | $ 10,380 tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_ConstructionMultiFamilyMember | $ 2,840 tsbk_LoansReceivableIncludingLoansHeldForSaleExcludingLoansInProcessAndDeferredFeesGrossMortgageLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_ConstructionMultiFamilyMember
Total construction and land development loans, percent | 13.40%tsbk_LoansReceivableRatioOfLoanCategoryToTotalConstructionAndLandDevelopmentLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_ConstructionMultiFamilyMember | 4.10%tsbk_LoansReceivableRatioOfLoanCategoryToTotalConstructionAndLandDevelopmentLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tsbk_ConstructionMultiFamilyMember

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