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Loans Receivable And Allowance For Loan Losses: Past Due Status of Loans (Details) - USD ($) $ in Thousands		Dec. 31, 2018	Sep. 30, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		$ 3,256	$ 2,556
Loans receivable, Non-Accrual	[1]	1,590	1,317
Loans receivable, Current		866,222	735,002
Loans receivable		869,478	737,558
Mortgage loans, one-to-four family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		509	1,102
Loans receivable, Non-Accrual	[1]	509	545
Loans receivable, Current		129,710	114,839
Loans receivable		130,219	115,941
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		72,076	61,928
Loans receivable		72,076	61,928
Mortgage loans, commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		1,093	574
Loans receivable, Non-Accrual	[1]	0	0
Loans receivable, Current		425,051	344,539
Loans receivable		426,144	345,113
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		64,313	67,024
Loans receivable		64,313	67,024
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		9,221	7,107
Loans receivable		9,221	7,107
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		25,883	23,440
Loans receivable		25,883	23,440
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		9,333	5,983
Loans receivable		9,333	5,983
Mortgage loans, construction - Land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		228	0
Loans receivable, Non-Accrual	[1]	0	0
Loans receivable, Current		6,214	1,567
Loans receivable		6,442	1,567
Mortgage loans, land
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		504	283
Loans receivable, Non-Accrual	[1]	396	243
Loans receivable, Current		22,230	25,263
Loans receivable		22,734	25,546
Consumer loans, home equity and second mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		423	401
Loans receivable, Non-Accrual	[1]	386	359
Loans receivable, Current		40,045	36,940
Loans receivable		40,468	37,341
Consumer loans, other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		26	26
Loans receivable, Non-Accrual	[1]	0	0
Loans receivable, Current		4,417	3,489
Loans receivable		4,443	3,515
Commercial business loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		473	170
Loans receivable, Non-Accrual	[1]	299	170
Loans receivable, Current		57,729	42,883
Loans receivable		58,202	43,053
30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		729	1,223
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		0	557
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		317	574
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, construction - Land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		228	0
30 to 59 Days Past Due | Mortgage loans, land
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		0	40
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		0	42
30 to 59 Days Past Due | Consumer loans, other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		10	10
30 to 59 Days Past Due | Commercial business loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		174	0
60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		937	16
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		776	0
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, construction - Land development
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		108	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		37	0
60 to 89 Days Past Due | Consumer loans, other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, Total Past Due		16	16
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, construction - Land development
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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