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Loans Receivable And Allowance For Loan Losses: Past Due Status of Loans (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Sep. 30, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		$ 3,120	$ 2,413
Loans receivable, Non-Accrual	[1]	2,113	1,911
Loans receivable, Current		714,217	699,970
Loans receivable		717,337	702,383
Mortgage loans, one-to-four family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		1,272	1,067
Loans receivable, Non-Accrual	[1]	947	874
Loans receivable, Current		115,704	117,080
Loans receivable		116,976	118,147
Mortgage loans, multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
Loans receivable, Non-Accrual	[1]	0	0
Loans receivable, Current		61,366	58,607
Loans receivable		61,366	58,607
Mortgage loans, commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		904	320
Loans receivable, Non-Accrual	[1]	402	213
Loans receivable, Current		332,181	328,607
Loans receivable		333,085	328,927
Mortgage loans, construction - custom and owner/builder
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
Loans receivable, Non-Accrual	[1]	0	0
Loans receivable, Current		71,548	63,538
Loans receivable		71,548	63,538
Mortgage loans, construction - speculative one-to-four family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
Loans receivable, Non-Accrual	[1]	0	0
Loans receivable, Current		2,723	4,639
Loans receivable		2,723	4,639
Mortgage loans, construction – commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
Loans receivable, Non-Accrual	[1]	0	0
Loans receivable, Current		14,390	11,016
Loans receivable		14,390	11,016
Mortgage loans, construction - Multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
Loans receivable, Non-Accrual	[1]	0	0
Loans receivable, Current		9,109	6,912
Loans receivable		9,109	6,912
Mortgage loans, land
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		438	566
Loans receivable, Non-Accrual	[1]	395	566
Loans receivable, Current		20,684	23,344
Loans receivable		21,122	23,910
Consumer loans, home equity and second mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		289	314
Loans receivable, Non-Accrual	[1]	188	258
Loans receivable, Current		38,686	38,106
Loans receivable		38,975	38,420
Consumer loans, other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		36	36
Loans receivable, Non-Accrual	[1]	0	0
Loans receivable, Current		4,014	3,787
Loans receivable		4,050	3,823
Commercial business loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		181	110
Loans receivable, Non-Accrual	[1]	181	0
Loans receivable, Current		43,812	44,334
Loans receivable		43,993	44,444
30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		971	395
30 to 59 Days Past Due | Mortgage loans, one-to-four family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		325	193
30 to 59 Days Past Due | Mortgage loans, multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
30 to 59 Days Past Due | Mortgage loans, commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		502	0
30 to 59 Days Past Due | Mortgage loans, construction - custom and owner/builder
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
30 to 59 Days Past Due | Mortgage loans, construction - speculative one-to-four family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
30 to 59 Days Past Due | Mortgage loans, construction – commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
30 to 59 Days Past Due | Mortgage loans, construction - Multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
30 to 59 Days Past Due | Mortgage loans, land
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		43	0
30 to 59 Days Past Due | Consumer loans, home equity and second mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		101	56
30 to 59 Days Past Due | Consumer loans, other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		0	36
30 to 59 Days Past Due | Commercial business loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		0	110
60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		36	107
60 to 89 Days Past Due | Mortgage loans, one-to-four family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
60 to 89 Days Past Due | Mortgage loans, multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
60 to 89 Days Past Due | Mortgage loans, commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		0	107
60 to 89 Days Past Due | Mortgage loans, construction - custom and owner/builder
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
60 to 89 Days Past Due | Mortgage loans, construction - speculative one-to-four family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
60 to 89 Days Past Due | Mortgage loans, construction – commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
60 to 89 Days Past Due | Mortgage loans, construction - Multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
60 to 89 Days Past Due | Mortgage loans, land
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
60 to 89 Days Past Due | Consumer loans, home equity and second mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
60 to 89 Days Past Due | Consumer loans, other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		36	0
60 to 89 Days Past Due | Commercial business loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
Past Due 90 Days or More and Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
Past Due 90 Days or More and Still Accruing | Mortgage loans, one-to-four family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
Past Due 90 Days or More and Still Accruing | Mortgage loans, multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
Past Due 90 Days or More and Still Accruing | Mortgage loans, commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
Past Due 90 Days or More and Still Accruing | Mortgage loans, construction - custom and owner/builder
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
Past Due 90 Days or More and Still Accruing | Mortgage loans, construction - speculative one-to-four family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
Past Due 90 Days or More and Still Accruing | Mortgage loans, construction – commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
Past Due 90 Days or More and Still Accruing | Mortgage loans, construction - Multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
Past Due 90 Days or More and Still Accruing | Mortgage loans, land
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
Past Due 90 Days or More and Still Accruing | Consumer loans, home equity and second mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
Past Due 90 Days or More and Still Accruing | Consumer loans, other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
Past Due 90 Days or More and Still Accruing | Commercial business loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		$ 0	$ 0
[1] Includes non-accrual loans past due 90 days or more and other loans classified as non-accrual.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524

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