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Loans Receivable And Allowance For Loan Losses: Financing Receivable Credit Quality Indicators (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Sep. 30, 2014
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable $ 596,547tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross $ 577,925tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 548,677tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 522,509tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Watch    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 13,655tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_InternalCreditAssessmentAxis
= tsbk_WatchMember		 10,254tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_InternalCreditAssessmentAxis
= tsbk_WatchMember
Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 15,803tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 27,106tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 18,412tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 18,056tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Mortgage loans, one-to-four family    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 107,821tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansOneToFourFamilyMember		 98,534tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansOneToFourFamilyMember
Mortgage loans, one-to-four family | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 99,880tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansOneToFourFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 90,340tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansOneToFourFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Mortgage loans, one-to-four family | Watch    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 1,999tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansOneToFourFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= tsbk_WatchMember		 1,749tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansOneToFourFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= tsbk_WatchMember
Mortgage loans, one-to-four family | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 1,037tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansOneToFourFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 1,045tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansOneToFourFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Mortgage loans, one-to-four family | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 4,905tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansOneToFourFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 5,400tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansOneToFourFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Mortgage loans, multi-family    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 48,641tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansMultiFamilyMember		 46,206tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansMultiFamilyMember
Mortgage loans, multi-family | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 39,842tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansMultiFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 37,336tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansMultiFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Mortgage loans, multi-family | Watch    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 1,682tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansMultiFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= tsbk_WatchMember		 1,697tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansMultiFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= tsbk_WatchMember
Mortgage loans, multi-family | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 6,357tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansMultiFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 6,410tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansMultiFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Mortgage loans, multi-family | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 760tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansMultiFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 763tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansMultiFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Mortgage loans, commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 296,338tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		 294,354tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
Mortgage loans, commercial | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 275,554tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 266,467tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Mortgage loans, commercial | Watch    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 8,121tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
/ us-gaap_InternalCreditAssessmentAxis
= tsbk_WatchMember		 5,819tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
/ us-gaap_InternalCreditAssessmentAxis
= tsbk_WatchMember
Mortgage loans, commercial | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 5,846tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 15,946tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Mortgage loans, commercial | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 6,817tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 6,122tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Mortgage loans, construction - custom and owner/builder    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 36,775tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionCustomAndOwnerbuilderMember		 34,553tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionCustomAndOwnerbuilderMember
Mortgage loans, construction - custom and owner/builder | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 36,550tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionCustomAndOwnerbuilderMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 34,553tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionCustomAndOwnerbuilderMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Mortgage loans, construction - custom and owner/builder | Watch    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 0tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionCustomAndOwnerbuilderMember
/ us-gaap_InternalCreditAssessmentAxis
= tsbk_WatchMember		 0tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionCustomAndOwnerbuilderMember
/ us-gaap_InternalCreditAssessmentAxis
= tsbk_WatchMember
Mortgage loans, construction - custom and owner/builder | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 0tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionCustomAndOwnerbuilderMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 0tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionCustomAndOwnerbuilderMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Mortgage loans, construction - custom and owner/builder | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 225tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionCustomAndOwnerbuilderMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 0tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionCustomAndOwnerbuilderMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Mortgage loans, construction - speculative one-to-four family    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 1,787tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionSpeculativeOneToFourFamilyMember		 1,204tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionSpeculativeOneToFourFamilyMember
Mortgage loans, construction - speculative one-to-four family | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 1,787tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionSpeculativeOneToFourFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 1,204tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionSpeculativeOneToFourFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Mortgage loans, construction - speculative one-to-four family | Watch    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 0tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionSpeculativeOneToFourFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= tsbk_WatchMember		 0tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionSpeculativeOneToFourFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= tsbk_WatchMember
Mortgage loans, construction - speculative one-to-four family | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 0tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionSpeculativeOneToFourFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 0tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionSpeculativeOneToFourFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Mortgage loans, construction - speculative one-to-four family | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 0tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionSpeculativeOneToFourFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 0tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionSpeculativeOneToFourFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Mortgage loans, construction – commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 1,283tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionCommercialMember		 2,887tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionCommercialMember
Mortgage loans, construction – commercial | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 1,283tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 2,887tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Mortgage loans, construction – commercial | Watch    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 0tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= tsbk_WatchMember		 0tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= tsbk_WatchMember
Mortgage loans, construction – commercial | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 0tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 0tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Mortgage loans, construction – commercial | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 0tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 0tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Mortgage loans, construction - Multi-family    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 1,598tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionMultiFamilyMember		 419tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionMultiFamilyMember
Mortgage loans, construction - Multi-family | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 1,598tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionMultiFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 419tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionMultiFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Mortgage loans, construction - Multi-family | Watch    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 0tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionMultiFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= tsbk_WatchMember		 0tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionMultiFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= tsbk_WatchMember
Mortgage loans, construction - Multi-family | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 0tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionMultiFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 0tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionMultiFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Mortgage loans, construction - Multi-family | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 0tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionMultiFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 0tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionMultiFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Mortgage loans, land    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 28,464tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansLandMember		 29,589tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansLandMember
Mortgage loans, land | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 20,181tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansLandMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 21,084tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansLandMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Mortgage loans, land | Watch    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 1,196tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansLandMember
/ us-gaap_InternalCreditAssessmentAxis
= tsbk_WatchMember		 114tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansLandMember
/ us-gaap_InternalCreditAssessmentAxis
= tsbk_WatchMember
Mortgage loans, land | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 2,454tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansLandMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 3,586tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansLandMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Mortgage loans, land | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 4,633tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansLandMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 4,805tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansLandMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Consumer loans, home equity and second mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 34,362tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConsumerLoansHomeEquityAndSecondMortgageMember		 34,921tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConsumerLoansHomeEquityAndSecondMortgageMember
Consumer loans, home equity and second mortgage | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 32,703tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConsumerLoansHomeEquityAndSecondMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 33,207tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConsumerLoansHomeEquityAndSecondMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Consumer loans, home equity and second mortgage | Watch    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 605tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConsumerLoansHomeEquityAndSecondMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= tsbk_WatchMember		 724tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConsumerLoansHomeEquityAndSecondMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= tsbk_WatchMember
Consumer loans, home equity and second mortgage | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 23tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConsumerLoansHomeEquityAndSecondMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 27tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConsumerLoansHomeEquityAndSecondMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Consumer loans, home equity and second mortgage | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 1,031tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConsumerLoansHomeEquityAndSecondMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 963tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConsumerLoansHomeEquityAndSecondMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Consumer loans, other    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 4,567tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember		 4,699tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
Consumer loans, other | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 4,526tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 4,657tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Consumer loans, other | Watch    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 0tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= tsbk_WatchMember		 39tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= tsbk_WatchMember
Consumer loans, other | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 0tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 0tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Consumer loans, other | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 41tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 3tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Commercial business loans    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 34,911tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember		 30,559tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
Commercial business loans | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 34,773tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 30,355tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Commercial business loans | Watch    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 52tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= tsbk_WatchMember		 112tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= tsbk_WatchMember
Commercial business loans | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 86tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 92tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Commercial business loans | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable $ 0tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 $ 0tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember