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Stock Plans And Stock Based Compensation: Schedule of Unrecognized Compensation Expense for stock-based awards (Details) (Stock Options, USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Compensation expense yet to be recognized for stock-based awards that have been awarded but not vested $ 333us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Remainder of 2015
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Compensation expense yet to be recognized for stock-based awards that have been awarded but not vested 53us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ tsbk_FuturePeriodsAxis
= tsbk_RemainderofcurrentyearMember
2016
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Compensation expense yet to be recognized for stock-based awards that have been awarded but not vested 106us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ tsbk_FuturePeriodsAxis
= tsbk_InOneYearMember
2017
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Compensation expense yet to be recognized for stock-based awards that have been awarded but not vested 98us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ tsbk_FuturePeriodsAxis
= tsbk_InTwoYearsMember
2018
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Compensation expense yet to be recognized for stock-based awards that have been awarded but not vested 67us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ tsbk_FuturePeriodsAxis
= tsbk_InThreeYearsMember
2019
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Compensation expense yet to be recognized for stock-based awards that have been awarded but not vested $ 9us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ tsbk_FuturePeriodsAxis
= tsbk_InFourYearsMember