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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	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	$ 358		$ 476
Allowance for Loan Losses, Collectively Evaluated for Impairment	9,174		9,077
Allowance for Loan Losses, Total	9,532	$ 9,544	9,553	$ 9,610	$ 9,590	$ 9,826
Recorded Investment in Loans, Individually Evaluated for Impairment	5,958		6,992
Recorded Investment in Loans, Collectively Evaluated for Impairment	723,367		695,391
Loans receivable	729,325		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	1,027		1,082
Allowance for Loan Losses, Total	1,027	1,060	1,082	1,115	1,126	1,239
Recorded Investment in Loans, Individually Evaluated for Impairment	1,873		1,443
Recorded Investment in Loans, Collectively Evaluated for Impairment	112,275		116,704
Loans receivable	114,148		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	407		447
Allowance for Loan Losses, Total	407	386	447	464	480	473
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	58,169		58,607
Loans receivable	58,169		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	4,183		4,158
Allowance for Loan Losses, Total	4,183	4,198	4,184	4,337	4,316	4,384
Recorded Investment in Loans, Individually Evaluated for Impairment	2,801		3,873
Recorded Investment in Loans, Collectively Evaluated for Impairment	342,742		325,054
Loans receivable	345,543		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	667		699
Allowance for Loan Losses, Total	667	705	699	712	695	619
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	66,651		63,538
Loans receivable	66,651		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	133		128
Allowance for Loan Losses, Total	133	99	128	75	85	130
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	5,312		4,639
Loans receivable	5,312		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	519		303
Allowance for Loan Losses, Total	519	445	303	283	268	268
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	21,640		11,016
Loans receivable	21,640		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	147		173
Allowance for Loan Losses, Total	147	284	173	132	96	316
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	6,526		6,912
Loans receivable	6,526		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	80
Allowance for Loan Losses, Total	80	48	0
Recorded Investment in Loans, Individually Evaluated for Impairment	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	2,573
Loans receivable	2,573
Mortgage loans, land
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0		125
Allowance for Loan Losses, Collectively Evaluated for Impairment	744		793
Allowance for Loan Losses, Total	744	691	918	904	947	820
Recorded Investment in Loans, Individually Evaluated for Impairment	540		1,119
Recorded Investment in Loans, Collectively Evaluated for Impairment	23,122		22,791
Loans receivable	23,662		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	297		325
Allowance for Loan Losses, Collectively Evaluated for Impairment	649		658
Allowance for Loan Losses, Total	946	945	983	955	957	939
Recorded Investment in Loans, Individually Evaluated for Impairment	570		557
Recorded Investment in Loans, Collectively Evaluated for Impairment	37,573		37,863
Loans receivable	38,143		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	121		121
Allowance for Loan Losses, Total	121	120	121	134	130	156
Recorded Investment in Loans, Individually Evaluated for Impairment			0
Recorded Investment in Loans, Collectively Evaluated for Impairment	3,674		3,823
Loans receivable	3,674		3,823
Commercial business loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	61		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	497		515
Allowance for Loan Losses, Total	558	$ 563	515	$ 499	$ 490	$ 482
Recorded Investment in Loans, Individually Evaluated for Impairment	174		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	43,110		44,444
Loans receivable	$ 43,284		$ 44,444

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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
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-Topic 310
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-Section 50
-Paragraph 11B
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-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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-Publisher FASB
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-Topic 310
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-Section 50
-Paragraph 11B
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