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Fair Value Measurements: Fair Value Measurements, Nonrecurring, Valuation Techniques (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Sep. 30, 2019
Fair Value, Inputs, Level 1 | Mortgage loans, one-to-four family
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Assets, estimated fair value, nonrecurring	$ 0
Fair Value, Inputs, Level 2 | Mortgage loans, one-to-four family
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Assets, estimated fair value, nonrecurring	0
Fair Value, Inputs, Level 3 | Mortgage loans, one-to-four family
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Assets, estimated fair value, nonrecurring	485
Nonrecurring | Fair Value, Inputs, Level 1
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Assets, estimated fair value, nonrecurring	0	$ 0
Nonrecurring | Fair Value, Inputs, Level 1 | Other consumer loans
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Assets, estimated fair value, nonrecurring		0
Nonrecurring | Fair Value, Inputs, Level 1 | Commercial business loans
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Assets, estimated fair value, nonrecurring	0	0
Nonrecurring | Fair Value, Inputs, Level 1 | Mortgage loans, land
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Assets, estimated fair value, nonrecurring	0	0
Nonrecurring | Fair Value, Inputs, Level 1 | Impaired loans
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Assets, estimated fair value, nonrecurring	0	0
Nonrecurring | Fair Value, Inputs, Level 1 | Private label residential
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Assets, estimated fair value, nonrecurring	0	0
Nonrecurring | Fair Value, Inputs, Level 1 | OREO and other repossessed assets
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Assets, estimated fair value, nonrecurring	0	0
Nonrecurring | Fair Value, Inputs, Level 2
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Assets, estimated fair value, nonrecurring	15	2
Nonrecurring | Fair Value, Inputs, Level 2 | Other consumer loans
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Assets, estimated fair value, nonrecurring		0
Nonrecurring | Fair Value, Inputs, Level 2 | Commercial business loans
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Assets, estimated fair value, nonrecurring	0	0
Nonrecurring | Fair Value, Inputs, Level 2 | Mortgage loans, land
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Assets, estimated fair value, nonrecurring	0	0
Nonrecurring | Fair Value, Inputs, Level 2 | Impaired loans
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Assets, estimated fair value, nonrecurring	0	0
Nonrecurring | Fair Value, Inputs, Level 2 | Private label residential
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Assets, estimated fair value, nonrecurring	15	2
Nonrecurring | Fair Value, Inputs, Level 2 | OREO and other repossessed assets
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Assets, estimated fair value, nonrecurring	0	0
Nonrecurring | Fair Value, Inputs, Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Assets, estimated fair value, nonrecurring	2,569	2,211
Nonrecurring | Fair Value, Inputs, Level 3 | Other consumer loans
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Assets, estimated fair value, nonrecurring		6
Nonrecurring | Fair Value, Inputs, Level 3 | Commercial business loans
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Assets, estimated fair value, nonrecurring	335	408
Nonrecurring | Fair Value, Inputs, Level 3 | Mortgage loans, land
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Assets, estimated fair value, nonrecurring	111	114
Nonrecurring | Fair Value, Inputs, Level 3 | Impaired loans
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Assets, estimated fair value, nonrecurring	931	528
Nonrecurring | Fair Value, Inputs, Level 3 | Impaired loans | Market Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Assets, estimated fair value, nonrecurring	931	528
Nonrecurring | Fair Value, Inputs, Level 3 | OREO and other repossessed assets | Market Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Assets, estimated fair value, nonrecurring	1,623	1,683
Nonrecurring | Fair Value, Inputs, Level 3 | Private label residential
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Assets, estimated fair value, nonrecurring	15	0
Nonrecurring | Fair Value, Inputs, Level 3 | OREO and other repossessed assets
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Assets, estimated fair value, nonrecurring	$ 1,623	$ 1,683

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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=117815213&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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