XML 74 R37.htm IDEA: XBRL DOCUMENT
v3.20.1

Investment Securities: Schedule of significant inputs utilized to measure management's estimate of the credit loss component on OTTI securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
Recoveries (other than temporary impairment OTTI) on investment securities | $ (3) | $ (20) | $ (106) | $ (32)
Net recoveries on investment securities | (3) | (9) | (106) | (20)
Held-to-maturity Securities |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
Recoveries (other than temporary impairment OTTI) on investment securities | 3 | 20 | 106 | 32
Held to Maturity - adjustment for portion of OTTI recorded as OCI before income taxes | 0 | (11) | 0 | (12)
Net recoveries on investment securities | 3 | 9 | 106 | 20
Available-for-sale Securities |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
AFS - OTTI | 0 | 0 | 0 | 0
AFS - - adjustment for portion of OTTI recorded as OCI before income taxes | 0 | 0 | 0 | 0
AFS - Net OTTI recognized in earnings | $ 0 | $ 0 | $ 0 | $ 0
Minimum |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
OTTI significant inputs - Constant prepayment rate | 6.00% | 6.00% | 6.00% | 6.00%
OTTI significant inputs - Collateral default rate | 1.86% | 0.00% | 1.86% | 0.00%
OTTI significant inputs - Loss severity rate | 0.00% | 0.00% | 0.00% | 0.00%
Maximum |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
OTTI significant inputs - Constant prepayment rate | 15.00% | 15.00% | 15.00% | 15.00%
OTTI significant inputs - Collateral default rate | 22.47% | 16.06% | 22.47% | 16.06%
OTTI significant inputs - Loss severity rate | 16.34% | 78.00% | 16.34% | 78.00%
Weighted Average |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
OTTI significant inputs - Constant prepayment rate | 10.91% | 10.24% | 10.91% | 10.24%
OTTI significant inputs - Collateral default rate | 10.44% | 5.20% | 10.44% | 5.20%
OTTI significant inputs - Loss severity rate | 4.02% | 40.02% | 4.02% | 40.02%

X
- Definition Marketable Securities, Realized Losses (Recoveries), Other than Temporary Impairments, Amount + References No definition available. + Details
Name: | tsbk_MarketableSecuritiesRealizedLossesRecoveriesOtherthanTemporaryImpairmentsAmount
Namespace Prefix: | tsbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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
- Definition Other than Temporary Impairment Losses (Recoveries), Investments, Portion Recognized in Earnings, Net + References No definition available. + Details
Name: | tsbk_OtherthanTemporaryImpairmentLossesRecoveriesInvestmentsPortionRecognizedinEarningsNet
Namespace Prefix: | tsbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References No definition available. + Details
Name: | us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, before tax, of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in other comprehensive income (OCI). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=118954083&loc=SL6284422-111562 + Details
Name: | us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, before tax, of other-than-temporary impairment (OTTI) on investment in debt security measured at amortized cost (held-to-maturity), recognized in other comprehensive income (OCI). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=118954083&loc=SL6284422-111562 + Details
Name: | us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestHeldtomaturitySecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis. + References No definition available. + Details
Name: | us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_InformationByCategoryOfDebtSecurityAxis=us-gaap_HeldtomaturitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InformationByCategoryOfDebtSecurityAxis=us-gaap_AvailableforsaleSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_WeightedAverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |