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Fair Value Measurements: Fair Value Measurements, Nonrecurring, Valuation Techniques (Details) (Market Approach, USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Impaired loans
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, estimated fair value, nonrecurring	$ 10,960us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = tsbk_TotalImpairedLoansMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember
Other real estate owned
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, estimated fair value, nonrecurring	$ 8,220us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = tsbk_OtherRealEstateOwnedMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember

X

- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_AssetsFairValueDisclosureNonrecurring
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_FairValueInputsAssetsQuantitativeInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=tsbk_OtherRealEstateOwnedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=tsbk_TotalImpairedLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: