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Loans Receivable And Allowance For Loan Losses: Financing Receivable Credit Quality Indicators (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Sep. 30, 2014
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable $ 585,757tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross $ 577,925tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 535,440tsbk_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 10,484tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_InternalCreditAssessmentAxis
= tsbk_WatchMember		 10,254tsbk_LoansReceivableIncludingLoansHeldForSaleAndUndisbursedPortionOfLoanBalanceGross
/ us-gaap_InternalCreditAssessmentAxis
= tsbk_WatchMember
Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans receivable 20,925tsbk_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 18,908tsbk_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 103,021tsbk_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 94,450tsbk_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 2,074tsbk_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 1,041tsbk_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 5,456tsbk_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 45,423tsbk_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 36,589tsbk_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 1,690tsbk_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 6,384tsbk_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 295,113tsbk_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 272,745tsbk_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 5,791tsbk_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 9,822tsbk_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 6,755tsbk_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 37,044tsbk_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 36,888tsbk_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 156tsbk_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 1,191tsbk_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 1,191tsbk_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 1,042tsbk_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 1,042tsbk_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 1,126tsbk_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 1,126tsbk_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 28,633tsbk_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 20,201tsbk_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 112tsbk_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 3,565tsbk_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 4,755tsbk_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 35,754tsbk_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 34,037tsbk_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 672tsbk_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 24tsbk_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 1,021tsbk_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 4,453tsbk_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 4,410tsbk_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 38tsbk_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 5tsbk_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 32,957tsbk_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 32,761tsbk_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 107tsbk_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 89tsbk_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