Loans Held For Investment: Schedule of Troubled Debt Restructurings by Nonaccrual Versus Accrual Status (Details) - USD ($) $ / shares in Thousands, $ in Thousands	3 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2017
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as Troubled Debt Restructurings in Default	$ 0	$ 0
Restructured loans on non-accrual status	$ 3,477		$ 3,126
Restructured loans on accrual status	962		506
Restructured loans	4,439		3,632
Mortgage loans, Single-family
Financing Receivable, Modifications [Line Items]
Restructured loans on non-accrual status	3,416		3,061
Restructured loans on accrual status	962		506
Commercial Business Loans
Financing Receivable, Modifications [Line Items]
Restructured loans on non-accrual status	$ 61		$ 65

Financing Receivable, Recorded Investment, Accrual Status

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- Definition

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+ 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.

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- Definition

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
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

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- Definition

Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5111-111524

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