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Mortgage Servicing Rights (Details) (USD $) | 12 Months Ended
--- | ---
Sep. 30, 2014 prepayment_speed_factor | Sep. 30, 2013 prepayment_speed_factor | Sep. 30, 2012 prepayment_speed_factor
Transfers and Servicing [Abstract] |  |  |
Mortgate Servicing Rights (MSR), Fair Value | $ 3,204,000 | $ 3,129,000 | $ 2,011,000
Mortgate Servicing Rights (MSR), Average Discount Rate for estimating Fair Value | 10.04% | 10.04% | 10.07%
Mortgate Servicing Rights (MSR), Average Prepayment Speed Factor for estimating Fair Value | 164 | 177 | 330
MSRs valuation allowances | $ 0 | $ 475,000 |

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- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
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Namespace Prefix: | tsbk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
Name: | tsbk_MortgageServicingRightsMSRAveragePrepaymentSpeedFactorforestimatingFairValue
Namespace Prefix: | tsbk_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

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- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
Name: | tsbk_MortgageServicingRightsMSRFairValue
Namespace Prefix: | tsbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition No authoritative reference available. + References No definition available. + Details
Name: | tsbk_MSRsValuationAllowances
Namespace Prefix: | tsbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration