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MBS And Other Investments: Schedule of significant inputs utilized to measure management's estimate of the credit loss component on OTTI securities (Details)	Dec. 31, 2014	Sep. 30, 2014
Minimum
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
OTTI significant inputs - Constant prepayment rate	6.00%tsbk_OTTISignificantInputsConstantPrepaymentRate / us-gaap_RangeAxis = us-gaap_MinimumMember	6.00%tsbk_OTTISignificantInputsConstantPrepaymentRate / us-gaap_RangeAxis = us-gaap_MinimumMember
OTTI significant inputs - Collateral default rate	0.01%tsbk_OTTISignificantInputsCollateralDefaultRate / us-gaap_RangeAxis = us-gaap_MinimumMember	0.01%tsbk_OTTISignificantInputsCollateralDefaultRate / us-gaap_RangeAxis = us-gaap_MinimumMember
OTTI significant inputs - Loss severity rate	0.15%tsbk_OTTISignificantInputsLossSeverityRate / us-gaap_RangeAxis = us-gaap_MinimumMember	0.16%tsbk_OTTISignificantInputsLossSeverityRate / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
OTTI significant inputs - Constant prepayment rate	15.00%tsbk_OTTISignificantInputsConstantPrepaymentRate / us-gaap_RangeAxis = us-gaap_MaximumMember	15.00%tsbk_OTTISignificantInputsConstantPrepaymentRate / us-gaap_RangeAxis = us-gaap_MaximumMember
OTTI significant inputs - Collateral default rate	16.97%tsbk_OTTISignificantInputsCollateralDefaultRate / us-gaap_RangeAxis = us-gaap_MaximumMember	22.34%tsbk_OTTISignificantInputsCollateralDefaultRate / us-gaap_RangeAxis = us-gaap_MaximumMember
OTTI significant inputs - Loss severity rate	60.00%tsbk_OTTISignificantInputsLossSeverityRate / us-gaap_RangeAxis = us-gaap_MaximumMember	75.17%tsbk_OTTISignificantInputsLossSeverityRate / us-gaap_RangeAxis = us-gaap_MaximumMember
Weighted Average
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
OTTI significant inputs - Constant prepayment rate	9.87%tsbk_OTTISignificantInputsConstantPrepaymentRate / us-gaap_RangeAxis = us-gaap_WeightedAverageMember	10.59%tsbk_OTTISignificantInputsConstantPrepaymentRate / us-gaap_RangeAxis = us-gaap_WeightedAverageMember
OTTI significant inputs - Collateral default rate	5.96%tsbk_OTTISignificantInputsCollateralDefaultRate / us-gaap_RangeAxis = us-gaap_WeightedAverageMember	7.41%tsbk_OTTISignificantInputsCollateralDefaultRate / us-gaap_RangeAxis = us-gaap_WeightedAverageMember
OTTI significant inputs - Loss severity rate	35.81%tsbk_OTTISignificantInputsLossSeverityRate / us-gaap_RangeAxis = us-gaap_WeightedAverageMember	45.81%tsbk_OTTISignificantInputsLossSeverityRate / us-gaap_RangeAxis = us-gaap_WeightedAverageMember

X

- Definition

-- None. No documentation exists for this element. --

+ References

No definition available.

+ Details

Name:	tsbk_OTTISignificantInputsCollateralDefaultRate
Namespace Prefix:	tsbk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

-- None. No documentation exists for this element. --

+ References

No definition available.

+ Details

Name:	tsbk_OTTISignificantInputsConstantPrepaymentRate
Namespace Prefix:	tsbk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

-- None. No documentation exists for this element. --

+ References

No definition available.

+ Details

Name:	tsbk_OTTISignificantInputsLossSeverityRate
Namespace Prefix:	tsbk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

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

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_WeightedAverageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: