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Fair Value Measurements: Balances of assets measured at estimated fair value on a non-recurring basis, and total losses resulting from estimated fair value adjustments (Details) - Nonrecurring - USD ($) $ in Thousands | Jun. 30, 2021 | Sep. 30, 2020
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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, one-to-four family |  |
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 | 0
Fair Value, Inputs, Level 1 | OREO and other repossessed assets |  |
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 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, estimated fair value, nonrecurring | 9 | 8
Fair Value, Inputs, Level 2 | Mortgage loans, one-to-four family |  |
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 | 9 | 8
Fair Value, Inputs, Level 2 | OREO and other repossessed assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, estimated fair value, nonrecurring | 0 | 0
Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, estimated fair value, nonrecurring | 280 | 1,741
Fair Value, Inputs, Level 3 | Mortgage loans, one-to-four family |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, estimated fair value, nonrecurring |  | 481
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 | 210
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 | 691
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 | 0
Fair Value, Inputs, Level 3 | OREO and other repossessed assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, estimated fair value, nonrecurring | $ 157 | $ 1,050

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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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