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Loans Receivable And Allowance For Loan Losses: Troubled Debt Restructurings on Financing Receivables (Details) (USD $)
Dec. 31, 2014
Sep. 30, 2014
Financing Receivable, Modifications [Line Items]    
Loans accounted for on a non-accrual basis $ 10,812,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus $ 10,909,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Accruing loans which are contractually past due 90 days or more 0us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing 812,000us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
Total of non-accrual and 90 days past due loans 10,812,000tsbk_TotalOfNonAccrualAnd90DaysPastDueLoans 11,721,000tsbk_TotalOfNonAccrualAnd90DaysPastDueLoans
Non-accrual investment securities 1,057,000us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest 1,101,000us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
OREO and other repossessed assets, net 8,220,000us-gaap_OtherRealEstateAndForeclosedAssets 9,092,000us-gaap_OtherRealEstateAndForeclosedAssets
Total non-performing assets 20,089,000tsbk_FinancingReceivablesRecordedInvestmentExcludingAccrualStatusLoans [1] 21,914,000tsbk_FinancingReceivablesRecordedInvestmentExcludingAccrualStatusLoans [1]
Troubled debt restructured loans on accrual status 14,371,000us-gaap_FinancingReceivableModificationsRecordedInvestment 19,088,000us-gaap_FinancingReceivableModificationsRecordedInvestment
Non-accrual and 90 days or more past due loans as a percentage of loans receivable 1.85%tsbk_NonAccrualAnd90DaysOrMorePastDueLoansAsPercentageOfLoansReceivable 2.03%tsbk_NonAccrualAnd90DaysOrMorePastDueLoansAsPercentageOfLoansReceivable
Non-accrual and 90 days or more past due loans as a percentage of total assets 1.44%tsbk_NonAccrualAnd90DaysOrMorePastDueLoansAsPercentageOfTotalAssets 1.57%tsbk_NonAccrualAnd90DaysOrMorePastDueLoansAsPercentageOfTotalAssets
Non-performing assets as a percentage of total assets 2.68%us-gaap_LoansAndLeasesReceivableRatioOfNonperformingLoansToAllLoans 2.94%us-gaap_LoansAndLeasesReceivableRatioOfNonperformingLoansToAllLoans
Loans receivable 583,917,000tsbk_LoansReceivableIncludingLoansHeldForSaleGross 576,179,000tsbk_LoansReceivableIncludingLoansHeldForSaleGross
Total assets 749,917,000us-gaap_Assets 745,565,000us-gaap_Assets
Loans and Leases Receivable, Impaired, Commitment to Lend 0us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend 0us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend
Allowance for Loan Losses Allocated to Troubled Debt Restructured Loans 210,000tsbk_AllowanceforLoanLossesAllocatedtoTroubledDebtRestructuredLoans 990,000tsbk_AllowanceforLoanLossesAllocatedtoTroubledDebtRestructuredLoans
Accruing    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructured loans on accrual status 12,337,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ tsbk_AccrualStatusAxis
= tsbk_AccrualMember		 16,804,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ tsbk_AccrualStatusAxis
= tsbk_AccrualMember
Non-Accrual    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructured loans on accrual status 2,034,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ tsbk_AccrualStatusAxis
= tsbk_NonAccrualMember		 2,284,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ tsbk_AccrualStatusAxis
= tsbk_NonAccrualMember
Mortgage loans, one-to-four family    
Financing Receivable, Modifications [Line Items]    
Loans accounted for on a non-accrual basis 4,296,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansOneToFourFamilyMember		 4,376,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansOneToFourFamilyMember
Troubled debt restructured loans on accrual status 2,795,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansOneToFourFamilyMember		 2,867,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansOneToFourFamilyMember
Mortgage loans, one-to-four family | Accruing    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructured loans on accrual status 2,624,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ tsbk_AccrualStatusAxis
= tsbk_AccrualMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansOneToFourFamilyMember		 2,634,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ tsbk_AccrualStatusAxis
= tsbk_AccrualMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansOneToFourFamilyMember
Mortgage loans, one-to-four family | Non-Accrual    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructured loans on accrual status 171,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ tsbk_AccrualStatusAxis
= tsbk_NonAccrualMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansOneToFourFamilyMember		 233,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ tsbk_AccrualStatusAxis
= tsbk_NonAccrualMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansOneToFourFamilyMember
Mortgage loans, multi-family    
Financing Receivable, Modifications [Line Items]    
Loans accounted for on a non-accrual basis 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansMultiFamilyMember		 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansMultiFamilyMember
Troubled debt restructured loans on accrual status 3,306,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansMultiFamilyMember		 3,317,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansMultiFamilyMember
Mortgage loans, multi-family | Accruing    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructured loans on accrual status 3,306,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ tsbk_AccrualStatusAxis
= tsbk_AccrualMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansMultiFamilyMember		 3,317,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ tsbk_AccrualStatusAxis
= tsbk_AccrualMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansMultiFamilyMember
Mortgage loans, multi-family | Non-Accrual    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructured loans on accrual status 0us-gaap_FinancingReceivableModificationsRecordedInvestment
/ tsbk_AccrualStatusAxis
= tsbk_NonAccrualMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansMultiFamilyMember		 0us-gaap_FinancingReceivableModificationsRecordedInvestment
/ tsbk_AccrualStatusAxis
= tsbk_NonAccrualMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansMultiFamilyMember
Mortgage loans, commercial    
Financing Receivable, Modifications [Line Items]    
Loans accounted for on a non-accrual basis 1,439,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		 1,468,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
Troubled debt restructured loans on accrual status 6,798,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		 11,428,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
Mortgage loans, commercial | Accruing    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructured loans on accrual status 5,359,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ tsbk_AccrualStatusAxis
= tsbk_AccrualMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		 9,960,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ tsbk_AccrualStatusAxis
= tsbk_AccrualMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
Mortgage loans, commercial | Non-Accrual    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructured loans on accrual status 1,439,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ tsbk_AccrualStatusAxis
= tsbk_NonAccrualMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		 1,468,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ tsbk_AccrualStatusAxis
= tsbk_NonAccrualMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
Mortgage loans, construction - custom and owner/builder    
Financing Receivable, Modifications [Line Items]    
Loans accounted for on a non-accrual basis 156,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionCustomAndOwnerbuilderMember		 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionCustomAndOwnerbuilderMember
Mortgage loans, construction - speculative one-to-four family    
Financing Receivable, Modifications [Line Items]    
Loans accounted for on a non-accrual basis 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionSpeculativeOneToFourFamilyMember		 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionSpeculativeOneToFourFamilyMember
Mortgage loans, construction - Multi-family    
Financing Receivable, Modifications [Line Items]    
Loans accounted for on a non-accrual basis 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionMultiFamilyMember		 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConstructionMultiFamilyMember
Mortgage loans, land    
Financing Receivable, Modifications [Line Items]    
Loans accounted for on a non-accrual basis 4,357,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansLandMember		 4,564,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansLandMember
Troubled debt restructured loans on accrual status 1,022,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansLandMember		 1,025,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansLandMember
Mortgage loans, land | Accruing    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructured loans on accrual status 750,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ tsbk_AccrualStatusAxis
= tsbk_AccrualMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansLandMember		 594,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ tsbk_AccrualStatusAxis
= tsbk_AccrualMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansLandMember
Mortgage loans, land | Non-Accrual    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructured loans on accrual status 272,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ tsbk_AccrualStatusAxis
= tsbk_NonAccrualMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansLandMember		 431,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ tsbk_AccrualStatusAxis
= tsbk_NonAccrualMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_MortgageLoansLandMember
Consumer loans, home equity and second mortgage    
Financing Receivable, Modifications [Line Items]    
Loans accounted for on a non-accrual basis 564,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConsumerLoansHomeEquityAndSecondMortgageMember		 498,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConsumerLoansHomeEquityAndSecondMortgageMember
Troubled debt restructured loans on accrual status 450,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConsumerLoansHomeEquityAndSecondMortgageMember		 451,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConsumerLoansHomeEquityAndSecondMortgageMember
Consumer loans, home equity and second mortgage | Accruing    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructured loans on accrual status 298,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ tsbk_AccrualStatusAxis
= tsbk_AccrualMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConsumerLoansHomeEquityAndSecondMortgageMember		 299,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ tsbk_AccrualStatusAxis
= tsbk_AccrualMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConsumerLoansHomeEquityAndSecondMortgageMember
Consumer loans, home equity and second mortgage | Non-Accrual    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructured loans on accrual status 152,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ tsbk_AccrualStatusAxis
= tsbk_NonAccrualMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConsumerLoansHomeEquityAndSecondMortgageMember		 152,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ tsbk_AccrualStatusAxis
= tsbk_NonAccrualMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= tsbk_ConsumerLoansHomeEquityAndSecondMortgageMember
Consumer loans, other    
Financing Receivable, Modifications [Line Items]    
Loans accounted for on a non-accrual basis $ 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember		 $ 3,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
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