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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, 2020	Dec. 31, 2019	Sep. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	$ 89		$ 172
Allowance for Loan Losses, Collectively Evaluated for Impairment	11,801		9,518
Allowance for Loan Losses, Total	11,890	$ 9,882	9,690	$ 9,741	$ 9,533	$ 9,530
Recorded Investment in Loans, Individually Evaluated for Impairment	6,093		5,937
Recorded Investment in Loans, Collectively Evaluated for Impairment	916,148		893,213
Loans receivable	922,241		899,150
Mortgage loans, one-to-four family
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	1,149		1,167
Allowance for Loan Losses, Total	1,149	1,065	1,167	1,154	1,159	1,086
Recorded Investment in Loans, Individually Evaluated for Impairment	1,426		1,192
Recorded Investment in Loans, Collectively Evaluated for Impairment	123,859		131,469
Loans receivable	125,285		132,661
Mortgage loans, multi-family
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	595		481
Allowance for Loan Losses, Total	595	499	481	470	449	433
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	81,298		76,036
Loans receivable	81,298		76,036
Mortgage loans, commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	5,762		4,154
Allowance for Loan Losses, Total	5,762	4,410	4,154	4,122	4,239	4,248
Recorded Investment in Loans, Individually Evaluated for Impairment	3,339		3,190
Recorded Investment in Loans, Collectively Evaluated for Impairment	440,937		415,927
Loans receivable	444,276		419,117
Mortgage loans, construction - custom and owner/builder
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	697		755
Allowance for Loan Losses, Total	697	754	755	666	643	671
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	69,298		75,411
Loans receivable	69,298		75,411
Mortgage loans, construction - speculative one-to-four family
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	204		212
Allowance for Loan Losses, Total	204	248	212	249	206	178
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	9,507		10,779
Loans receivable	9,507		10,779
Mortgage loans, construction – commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	423		338
Allowance for Loan Losses, Total	423	403	338	384	386	563
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	25,803		24,051
Loans receivable	25,803		24,051
Mortgage loans, construction - Multi-family
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	394		375
Allowance for Loan Losses, Total	394	333	375	272	209	135
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	18,753		19,256
Loans receivable	18,753		19,256
Mortgage loans, construction - Land development
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	80		67
Allowance for Loan Losses, Total	80	48	67	244	143	49
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	2,265		1,803
Loans receivable	2,265		1,803
Mortgage loans, land
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	25		27
Allowance for Loan Losses, Collectively Evaluated for Impairment	653		670
Allowance for Loan Losses, Total	678	654	697	649	757	844
Recorded Investment in Loans, Individually Evaluated for Impairment	193		204
Recorded Investment in Loans, Collectively Evaluated for Impairment	29,140		30,566
Loans receivable	29,333		30,770
Consumer loans, home equity and second mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	656		623
Allowance for Loan Losses, Total	656	609	623	667	666	649
Recorded Investment in Loans, Individually Evaluated for Impairment	581		603
Recorded Investment in Loans, Collectively Evaluated for Impairment	38,391		39,587
Loans receivable	38,972		40,190
Consumer loans, other
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0		17
Allowance for Loan Losses, Collectively Evaluated for Impairment	78		82
Allowance for Loan Losses, Total	78	87	99	112	101	117
Recorded Investment in Loans, Individually Evaluated for Impairment	11		23
Recorded Investment in Loans, Collectively Evaluated for Impairment	3,818		4,289
Loans receivable	3,829		4,312
Commercial business loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	64		128
Allowance for Loan Losses, Collectively Evaluated for Impairment	1,110		594
Allowance for Loan Losses, Total	1,174	$ 772	722	$ 752	$ 575	$ 557
Recorded Investment in Loans, Individually Evaluated for Impairment	543		725
Recorded Investment in Loans, Collectively Evaluated for Impairment	73,079		64,039
Loans receivable	$ 73,622		$ 64,764

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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