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Fair Value Measurements: Balances of Assets and Liabilities Measured on Nonrecurring Basis (Details) - Nonrecurring - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016
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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 | Consumer loans, other |  |
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 | 125 | 20
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 | Consumer loans, other |  |
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 | 125 | 20
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 | 5,987 | 9,636
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 |  | 1,280
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 | 1,880 | 3,330
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 | 697 | 522
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 | 109 | 370
Fair Value, Inputs, Level 3 | Consumer loans, other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, estimated fair value, nonrecurring |  | 17
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 | 2,686 | 5,519
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 | $ 3,301 | $ 4,117

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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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