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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	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	$ 396		$ 476
Allowance for Loan Losses, Collectively Evaluated for Impairment	9,148		9,077
Allowance for Loan Losses, Total	9,544	$ 9,565	9,553	$ 9,590	$ 9,843	$ 9,826
Recorded Investment in Loans, Individually Evaluated for Impairment	5,196		6,992
Recorded Investment in Loans, Collectively Evaluated for Impairment	715,431		695,391
Loans receivable	720,627		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	1,060		1,082
Allowance for Loan Losses, Total	1,060	1,125	1,082	1,126	1,177	1,239
Recorded Investment in Loans, Individually Evaluated for Impairment	1,318		1,443
Recorded Investment in Loans, Collectively Evaluated for Impairment	111,544		116,704
Loans receivable	112,862		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	386		447
Allowance for Loan Losses, Total	386	430	447	480	400	473
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	55,157		58,607
Loans receivable	55,157		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	4,198		4,158
Allowance for Loan Losses, Total	4,198	4,093	4,184	4,316	4,523	4,384
Recorded Investment in Loans, Individually Evaluated for Impairment	2,578		3,873
Recorded Investment in Loans, Collectively Evaluated for Impairment	339,267		325,054
Loans receivable	341,845		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	705		699
Allowance for Loan Losses, Total	705	788	699	695	636	619
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	69,073		63,538
Loans receivable	69,073		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	99		128
Allowance for Loan Losses, Total	99	75	128	85	100	130
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	3,968		4,639
Loans receivable	3,968		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	445		303
Allowance for Loan Losses, Total	445	396	303	268	282	268
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	17,788		11,016
Loans receivable	17,788		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	284		173
Allowance for Loan Losses, Total	284	228	173	96	385	316
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	12,613		6,912
Loans receivable	12,613		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	48
Allowance for Loan Losses, Total	48	0	0
Recorded Investment in Loans, Individually Evaluated for Impairment	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	1,484
Loans receivable	1,484
Mortgage loans, land
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	40		125
Allowance for Loan Losses, Collectively Evaluated for Impairment	651		793
Allowance for Loan Losses, Total	691	780	918	947	836	820
Recorded Investment in Loans, Individually Evaluated for Impairment	640		1,119
Recorded Investment in Loans, Collectively Evaluated for Impairment	19,962		22,791
Loans receivable	20,602		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	293		325
Allowance for Loan Losses, Collectively Evaluated for Impairment	652		658
Allowance for Loan Losses, Total	945	958	983	957	859	939
Recorded Investment in Loans, Individually Evaluated for Impairment	479		557
Recorded Investment in Loans, Collectively Evaluated for Impairment	37,645		37,863
Loans receivable	38,124		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	120		121
Allowance for Loan Losses, Total	120	129	121	130	156	156
Recorded Investment in Loans, Individually Evaluated for Impairment			0
Recorded Investment in Loans, Collectively Evaluated for Impairment	3,646		3,823
Loans receivable	3,646		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	500		515
Allowance for Loan Losses, Total	563	$ 563	515	$ 490	$ 489	$ 482
Recorded Investment in Loans, Individually Evaluated for Impairment	181		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	43,284		44,444
Loans receivable	$ 43,465		$ 44,444

X

- 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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+ 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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-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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-Topic 310
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-Paragraph 11B
-Subparagraph (h)
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