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OREO and Other Repossessed Assets: Narrative (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2017 USD ($) property	Sep. 30, 2016 USD ($) property	Sep. 30, 2015 USD ($)
Real Estate Properties [Line Items]
Other real estate owned (“OREO”) and other repossessed assets, net	$ 3,301	$ 4,117	$ 7,854
(Gain) loss on sales of OREO and other repossessed assets, net	54	$ 47	$ 110
Recorded amount of foreclosed residential real estate properties held in OREO	875
Mortgage loans, one-to-four family
Real Estate Properties [Line Items]
Recorded amount of foreclosed residential real estate properties held in OREO	$ 100
Washington
Real Estate Properties [Line Items]
OREO, number of repossessed assets | property	15	22
Number of other repossessed assets | property	1	1
Washington | Minimum
Real Estate Properties [Line Items]
Other real estate owned (“OREO”) and other repossessed assets, net	$ 13	$ 6
Washington | Maximum
Real Estate Properties [Line Items]
Other real estate owned (“OREO”) and other repossessed assets, net	$ 948	$ 957

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Other Real Estate Owned, Foreclosed Residential Real Estate Properties, Amount

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Other Real Estate Owned, Repossessed Assets

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Other Repossessed Assets, Number

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- Definition

The net gain (loss) resulting from sales and other disposals of other real estate owned, increases (decreases) in the valuation allowance for foreclosed real estate, and write-downs of other real estate owned after acquisition or physical possession.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.14(d))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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Carrying amount as of the balance sheet date of other real estate and foreclosed assets. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10(4))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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