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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, 2013 | Sep. 30, 2013
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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%
OTTI significant inputs - Collateral default rate | 0.52% | 0.73%
OTTI significant inputs - Loss severity rate | 20.34% | 20.48%
Maximum |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |
OTTI significant inputs - Constant prepayment rate | 15.00% | 15.00%
OTTI significant inputs - Collateral default rate | 20.40% | 22.53%
OTTI significant inputs - Loss severity rate | 71.52% | 75.02%
Weighted Average |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |
OTTI significant inputs - Constant prepayment rate | 12.72% | 12.33%
OTTI significant inputs - Collateral default rate | 6.79% | 7.84%
OTTI significant inputs - Loss severity rate | 43.78% | 52.69%

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