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Loans Receivable And Allowance For Loan Losses: Schedule of Troubled Debt Restructurings by Portfolio Segment (Details) $ in Thousands		12 Months Ended
		Sep. 30, 2015 USD ($) contract	Mar. 31, 2016 USD ($)
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, End of Period Balance		$ 13,718	$ 8,455
Portfolio Segment
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract		1
Pre-Modification Outstanding Recorded Investment		$ 48
Post-Modification Outstanding Recorded Investment		48
Troubled debt restructurings, End of Period Balance		$ 48
Portfolio Segment | Mortgage loans, one-to-four family
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[1]	1
Pre-Modification Outstanding Recorded Investment	[1]	$ 48
Post-Modification Outstanding Recorded Investment	[1]	48
Troubled debt restructurings, End of Period Balance	[1]	$ 48
[1] Modification was a result of a reduction in the stated interest rate.

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Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953676-111524

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Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953676-111524

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Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953676-111524

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The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=65880944

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