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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) | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011
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Minimum |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |
OTTI significant inputs - Constant prepayment rate | 6.00% | 6.00% | 6.00%
OTTI significant inputs - Collateral default rate | 0.73% | 0.06% | 0.43%
OTTI significant inputs - Loss severity rate | 20.48% | 0.52% | 11.93%
Maximum |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |
OTTI significant inputs - Constant prepayment rate | 15.00% | 15.00% | 15.00%
OTTI significant inputs - Collateral default rate | 22.53% | 28.40% | 24.23%
OTTI significant inputs - Loss severity rate | 75.02% | 76.03% | 64.54%
Weighted Average |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |
OTTI significant inputs - Constant prepayment rate | 12.33% | 8.77% | 10.71%
OTTI significant inputs - Collateral default rate | 7.84% | 8.74% | 8.03%
OTTI significant inputs - Loss severity rate | 52.69% | 48.28% | 39.22%

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

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- 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