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Deposits: Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Deposits [Abstract]
Time Deposits, $250,000 Or More	$ 18,164	$ 15,601
Brokered deposits	$ 17,202	$ 15,642

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- References

No definition available.

+ Details

Name:	tsbk_BrokeredDeposits
Namespace Prefix:	tsbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Time Deposits, 250,000 Or More

+ References

No definition available.

+ Details

Name:	tsbk_TimeDeposits250000OrMore
Namespace Prefix:	tsbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

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