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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, 2017	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	$ 435	$ 476
Allowance for Loan Losses, Collectively Evaluated for Impairment	9,130	9,077
Allowance for Loan Losses, Total	9,565	9,553	$ 9,843	$ 9,826
Recorded Investment in Loans, Individually Evaluated for Impairment	7,120	6,992
Recorded Investment in Loans, Collectively Evaluated for Impairment	710,217	695,391
Loans receivable	717,337	702,383
Mortgage loans, one-to-four family
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	1	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	1,124	1,082
Allowance for Loan Losses, Total	1,125	1,082	1,177	1,239
Recorded Investment in Loans, Individually Evaluated for Impairment	1,467	1,443
Recorded Investment in Loans, Collectively Evaluated for Impairment	115,509	116,704
Loans receivable	116,976	118,147
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	430	447
Allowance for Loan Losses, Total	430	447	400	473
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	61,366	58,607
Loans receivable	61,366	58,607
Mortgage loans, commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	16	26
Allowance for Loan Losses, Collectively Evaluated for Impairment	4,077	4,158
Allowance for Loan Losses, Total	4,093	4,184	4,523	4,384
Recorded Investment in Loans, Individually Evaluated for Impairment	4,044	3,873
Recorded Investment in Loans, Collectively Evaluated for Impairment	329,041	325,054
Loans receivable	333,085	328,927
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	788	699
Allowance for Loan Losses, Total	788	699	636	619
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	71,548	63,538
Loans receivable	71,548	63,538
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	75	128
Allowance for Loan Losses, Total	75	128	100	130
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	2,723	4,639
Loans receivable	2,723	4,639
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	396	303
Allowance for Loan Losses, Total	396	303	282	268
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	14,390	11,016
Loans receivable	14,390	11,016
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	228	173
Allowance for Loan Losses, Total	228	173	385	316
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	9,109	6,912
Loans receivable	9,109	6,912
Mortgage loans, land
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	72	125
Allowance for Loan Losses, Collectively Evaluated for Impairment	708	793
Allowance for Loan Losses, Total	780	918	836	820
Recorded Investment in Loans, Individually Evaluated for Impairment	944	1,119
Recorded Investment in Loans, Collectively Evaluated for Impairment	20,178	22,791
Loans receivable	21,122	23,910
Consumer loans, home equity and second mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	291	325
Allowance for Loan Losses, Collectively Evaluated for Impairment	667	658
Allowance for Loan Losses, Total	958	983	859	939
Recorded Investment in Loans, Individually Evaluated for Impairment	484	557
Recorded Investment in Loans, Collectively Evaluated for Impairment	38,491	37,863
Loans receivable	38,975	38,420
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	129	121
Allowance for Loan Losses, Total	129	121	156	156
Recorded Investment in Loans, Individually Evaluated for Impairment		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	4,050	3,823
Loans receivable	4,050	3,823
Commercial business loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	55	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	508	515
Allowance for Loan Losses, Total	563	515	$ 489	$ 482
Recorded Investment in Loans, Individually Evaluated for Impairment	181	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	43,812	44,444
Loans receivable	$ 43,993	$ 44,444

X

- Definition

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

+ References

No definition available.

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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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+ 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 (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
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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- Definition

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

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