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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) | Mar. 31, 2015 | Sep. 30, 2014
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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 | 0.09%tsbk_OTTISignificantInputsCollateralDefaultRate / us-gaap_RangeAxis = us-gaap_MinimumMember | 0.01%tsbk_OTTISignificantInputsCollateralDefaultRate / us-gaap_RangeAxis = us-gaap_MinimumMember
OTTI significant inputs - Loss severity rate | 0.98%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 | 16.68%tsbk_OTTISignificantInputsCollateralDefaultRate / us-gaap_RangeAxis = us-gaap_MaximumMember | 22.34%tsbk_OTTISignificantInputsCollateralDefaultRate / us-gaap_RangeAxis = us-gaap_MaximumMember
OTTI significant inputs - Loss severity rate | 63.18%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 | 9.40%tsbk_OTTISignificantInputsConstantPrepaymentRate / us-gaap_RangeAxis = us-gaap_WeightedAverageMember | 10.59%tsbk_OTTISignificantInputsConstantPrepaymentRate / us-gaap_RangeAxis = us-gaap_WeightedAverageMember
OTTI significant inputs - Collateral default rate | 6.26%tsbk_OTTISignificantInputsCollateralDefaultRate / us-gaap_RangeAxis = us-gaap_WeightedAverageMember | 7.41%tsbk_OTTISignificantInputsCollateralDefaultRate / us-gaap_RangeAxis = us-gaap_WeightedAverageMember
OTTI significant inputs - Loss severity rate | 41.54%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: |