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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) - USD ($) $ in Thousands | Dec. 31, 2017 | Sep. 30, 2017
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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 | Mortgage loans, commercial |  |
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 | 0
Fair Value, Inputs, Level 1 | Consumer loans, home equity and second mortgage |  |
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 | Commercial business loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, estimated fair value, nonrecurring | 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 items |  |
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 | 112 | 125
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 | Mortgage loans, commercial |  |
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 | Mortgage loans, land |  |
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 | Consumer loans, home equity and second mortgage |  |
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 | Commercial business loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, estimated fair value, nonrecurring | 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 | 112 | 125
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 | 0
Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, estimated fair value, nonrecurring | 5,765 | 5,987
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 | 43 |
Fair Value, Inputs, Level 3 | Mortgage loans, commercial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, estimated fair value, nonrecurring | 1,877 | 1,880
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 | 827 | 697
Fair Value, Inputs, Level 3 | Consumer loans, home equity and second mortgage |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, estimated fair value, nonrecurring | 5 | 109
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 | 126 |
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 | 2,878 | 2,686
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 items |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, estimated fair value, nonrecurring | $ 2,887 | $ 3,301

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + 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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