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Fair Value Measurements: Balances of Assets and Liabilities Measured on Nonrecurring Basis (Details) - Nonrecurring - USD ($) $ in Thousands | Sep. 30, 2022 | Sep. 30, 2021
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Fair Value, Inputs, Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, estimated fair value, nonrecurring | $ 0 | $ 0
Fair Value, Inputs, Level 1 | Mortgage loans, land |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, estimated fair value, nonrecurring |  | 0
Fair Value, Inputs, Level 1 | Commercial business loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, estimated fair value, nonrecurring | 0 | 0
Fair Value, Inputs, Level 1 | Total impaired loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, estimated fair value, nonrecurring | 0 | 0
Fair Value, Inputs, Level 1 | Private label residential |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, estimated fair value, nonrecurring |  | 0
Fair Value, Inputs, Level 1 | OREO and other repossessed items |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, estimated fair value, nonrecurring |  | 0
Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, estimated fair value, nonrecurring | 0 | 10
Fair Value, Inputs, Level 2 | Mortgage loans, land |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, estimated fair value, nonrecurring |  | 0
Fair Value, Inputs, Level 2 | Commercial business loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, estimated fair value, nonrecurring | 0 | 0
Fair Value, Inputs, Level 2 | Total impaired loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, estimated fair value, nonrecurring | 0 | 0
Fair Value, Inputs, Level 2 | Private label residential |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, estimated fair value, nonrecurring |  | 10
Fair Value, Inputs, Level 2 | OREO and other repossessed items |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, estimated fair value, nonrecurring |  | 0
Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, estimated fair value, nonrecurring | 123 | 566
Fair Value, Inputs, Level 3 | Mortgage loans, land |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, estimated fair value, nonrecurring |  | 286
Fair Value, Inputs, Level 3 | Commercial business loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, estimated fair value, nonrecurring | 123 | 123
Fair Value, Inputs, Level 3 | Total impaired loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, estimated fair value, nonrecurring | $ 123 | 409
Fair Value, Inputs, Level 3 | Private label residential |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, estimated fair value, nonrecurring |  | 0
Fair Value, Inputs, Level 3 | OREO and other repossessed items |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, estimated fair value, nonrecurring |  | $ 157

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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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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