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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	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	$ 97	$ 476
Allowance for Loan Losses, Collectively Evaluated for Impairment	9,433	9,077
Allowance for Loan Losses, Total	9,530	9,553	$ 9,826	$ 9,924
Recorded Investment in Loans, Individually Evaluated for Impairment	4,272	6,992
Recorded Investment in Loans, Collectively Evaluated for Impairment	733,286	695,391
Loans receivable	737,558	702,383
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	1,086	1,082
Allowance for Loan Losses, Total	1,086	1,082	1,239	1,480
Recorded Investment in Loans, Individually Evaluated for Impairment	1,054	1,443
Recorded Investment in Loans, Collectively Evaluated for Impairment	114,887	116,704
Loans receivable	115,941	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	433	447
Allowance for Loan Losses, Total	433	447	473	392
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	61,928	58,607
Loans receivable	61,928	58,607
Mortgage loans, commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0	26
Allowance for Loan Losses, Collectively Evaluated for Impairment	4,248	4,158
Allowance for Loan Losses, Total	4,248	4,184	4,384	4,065
Recorded Investment in Loans, Individually Evaluated for Impairment	2,446	3,873
Recorded Investment in Loans, Collectively Evaluated for Impairment	342,667	325,054
Loans receivable	345,113	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	671	699
Allowance for Loan Losses, Total	671	699	619	451
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	67,024	63,538
Loans receivable	67,024	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	178	128
Allowance for Loan Losses, Total	178	128	130	123
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	7,107	4,639
Loans receivable	7,107	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	563	303
Allowance for Loan Losses, Total	563	303	268	426
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	23,440	11,016
Loans receivable	23,440	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	135	173
Allowance for Loan Losses, Total	135	173	316	283
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	5,983	6,912
Loans receivable	5,983	6,912
Mortgage loans - construction - land development
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	49
Allowance for Loan Losses, Total	49	0
Recorded Investment in Loans, Individually Evaluated for Impairment	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	1,567
Loans receivable	1,567
Mortgage loans, land
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	34	125
Allowance for Loan Losses, Collectively Evaluated for Impairment	810	793
Allowance for Loan Losses, Total	844	918	820	1,021
Recorded Investment in Loans, Individually Evaluated for Impairment	243	1,119
Recorded Investment in Loans, Collectively Evaluated for Impairment	25,303	22,791
Loans receivable	25,546	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	0	325
Allowance for Loan Losses, Collectively Evaluated for Impairment	649	658
Allowance for Loan Losses, Total	649	983	939	1,073
Recorded Investment in Loans, Individually Evaluated for Impairment	359	557
Recorded Investment in Loans, Collectively Evaluated for Impairment	36,982	37,863
Loans receivable	37,341	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	117	121
Allowance for Loan Losses, Total	117	121	156	187
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	3,515	3,823
Loans receivable	3,515	3,823
Commercial business loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	63	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	494	515
Allowance for Loan Losses, Total	557	515	$ 482	$ 423
Recorded Investment in Loans, Individually Evaluated for Impairment	170	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	42,883	44,444
Loans receivable	$ 43,053	$ 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
-Name Accounting Standards Codification
-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
-Name Accounting Standards Codification
-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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