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Premises and Equipment: Rent Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Property, Plant and Equipment [Line Items] |  |  |
Operating leases, rent expense | $ 377 | $ 332 | $ 206
Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Operating leases, term of contract | 22 months |  |
Minimum | Office Building |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Operating leases, term of contract | 5 years |  |
Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Operating leases, term of contract | 11 years |  |
Maximum | Office Building |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Operating leases, term of contract | 10 years |  |

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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Balance Type: | na
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- 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |