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Loans Receivable And Allowance For Loan Losses: Schedule of loans evaluated individually for impairment and collectively evaluated for impairment in the allowance for loan losses (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	$ 137	$ 97
Allowance for Loan Losses, Collectively Evaluated for Impairment	9,396	9,433
Allowance for Loan Losses, Total	9,533	9,530	$ 9,565	$ 9,553
Recorded Investment in Loans, Individually Evaluated for Impairment	4,531	4,272
Recorded Investment in Loans, Collectively Evaluated for Impairment	864,947	733,286
Loans receivable	869,478	737,558
Mortgage loans, one-to-four family
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	1,159	1,086
Allowance for Loan Losses, Total	1,159	1,086	1,125	1,082
Recorded Investment in Loans, Individually Evaluated for Impairment	1,014	1,054
Recorded Investment in Loans, Collectively Evaluated for Impairment	129,205	114,887
Loans receivable	130,219	115,941
Mortgage loans, multi-family
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	449	433
Allowance for Loan Losses, Total	449	433	430	447
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	72,076	61,928
Loans receivable	72,076	61,928
Mortgage loans, commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	4,239	4,248
Allowance for Loan Losses, Total	4,239	4,248	4,093	4,184
Recorded Investment in Loans, Individually Evaluated for Impairment	2,436	2,446
Recorded Investment in Loans, Collectively Evaluated for Impairment	423,708	342,667
Loans receivable	426,144	345,113
Mortgage loans, construction - custom and owner/builder
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	643	671
Allowance for Loan Losses, Total	643	671	788	699
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	64,313	67,024
Loans receivable	64,313	67,024
Mortgage loans, construction - speculative one-to-four family
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	206	178
Allowance for Loan Losses, Total	206	178	75	128
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	9,221	7,107
Loans receivable	9,221	7,107
Mortgage loans, construction – commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	386	563
Allowance for Loan Losses, Total	386	563	396	303
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	25,883	23,440
Loans receivable	25,883	23,440
Mortgage loans, construction - Multi-family
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	209	135
Allowance for Loan Losses, Total	209	135	228	173
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	9,333	5,983
Loans receivable	9,333	5,983
Mortgage loans, construction - Land development
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	143	49
Allowance for Loan Losses, Total	143	49
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	6,442	1,567
Loans receivable	6,442	1,567
Mortgage loans, land
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	79	34
Allowance for Loan Losses, Collectively Evaluated for Impairment	678	810
Allowance for Loan Losses, Total	757	844	780	918
Recorded Investment in Loans, Individually Evaluated for Impairment	396	243
Recorded Investment in Loans, Collectively Evaluated for Impairment	22,338	25,303
Loans receivable	22,734	25,546
Consumer loans, home equity and second mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	666	649
Allowance for Loan Losses, Total	666	649	958	983
Recorded Investment in Loans, Individually Evaluated for Impairment	386	359
Recorded Investment in Loans, Collectively Evaluated for Impairment	40,082	36,982
Loans receivable	40,468	37,341
Consumer loans, other
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	101	117
Allowance for Loan Losses, Total	101	117	129	121
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	4,443	3,515
Loans receivable	4,443	3,515
Commercial business loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	58	63
Allowance for Loan Losses, Collectively Evaluated for Impairment	517	494
Allowance for Loan Losses, Total	575	557	$ 563	$ 515
Recorded Investment in Loans, Individually Evaluated for Impairment	299	170
Recorded Investment in Loans, Collectively Evaluated for Impairment	57,903	42,883
Loans receivable	$ 58,202	$ 43,053

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- Definition

Loans Receivable, Including Loans Held-For-Sale and Loans in Process, Gross

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- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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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 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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+ References

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-Publisher FASB
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-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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-Publisher FASB
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-Topic 310
-SubTopic 10
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-Paragraph 11B
-Subparagraph (h)
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