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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, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	$ 171		$ 41
Allowance for Loan Losses, Collectively Evaluated for Impairment	13,298		13,373
Allowance for Loan Losses, Total	13,469	$ 13,434	13,414	$ 12,894	$ 11,890	$ 9,690
Recorded Investment in Loans, Individually Evaluated for Impairment	4,409		5,773
Recorded Investment in Loans, Collectively Evaluated for Impairment	1,016,964		1,027,952
Loans receivable	1,021,373		1,033,725
Mortgage loans, one-to-four family
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0		3
Allowance for Loan Losses, Collectively Evaluated for Impairment	1,142		1,160
Allowance for Loan Losses, Total	1,142	1,151	1,163	1,163	1,149	1,167
Recorded Investment in Loans, Individually Evaluated for Impairment	411		1,143
Recorded Investment in Loans, Collectively Evaluated for Impairment	118,762		117,437
Loans receivable	119,173		118,580
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	810		718
Allowance for Loan Losses, Total	810	784	718	665	595	481
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	94,756		85,053
Loans receivable	94,756		85,053
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	6,961		7,144
Allowance for Loan Losses, Total	6,961	7,238	7,144	6,719	5,762	4,154
Recorded Investment in Loans, Individually Evaluated for Impairment	2,753		3,242
Recorded Investment in Loans, Collectively Evaluated for Impairment	456,136		450,332
Loans receivable	458,889		453,574
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	604		832
Allowance for Loan Losses, Total	604	695	832	807	697	755
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	57,309		75,332
Loans receivable	57,309		75,332
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	184		158
Allowance for Loan Losses, Total	184	148	158	164	204	212
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	9,263		7,108
Loans receivable	9,263		7,108
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	758		420
Allowance for Loan Losses, Total	758	714	420	304	423	338
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	37,007		20,927
Loans receivable	37,007		20,927
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	448		238
Allowance for Loan Losses, Total	448	323	238	318	394	375
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	22,397		10,832
Loans receivable	22,397		10,832
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	31		133
Allowance for Loan Losses, Total	31	19	133	107	80	67
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	1,151		4,739
Loans receivable	1,151		4,739
Mortgage loans, land
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	384		572
Allowance for Loan Losses, Total	384	407	572	642	678	697
Recorded Investment in Loans, Individually Evaluated for Impairment	169		394
Recorded Investment in Loans, Collectively Evaluated for Impairment	18,120		25,177
Loans receivable	18,289		25,571
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	551		593
Allowance for Loan Losses, Total	551	552	593	632	656	623
Recorded Investment in Loans, Individually Evaluated for Impairment	545		555
Recorded Investment in Loans, Collectively Evaluated for Impairment	31,346		31,522
Loans receivable	31,891		32,077
Consumer loans, other
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	56		71
Allowance for Loan Losses, Total	56	56	71	73	78	99
Recorded Investment in Loans, Individually Evaluated for Impairment	18		9
Recorded Investment in Loans, Collectively Evaluated for Impairment	2,707		3,563
Loans receivable	2,725		3,572
Commercial business loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	171		38
Allowance for Loan Losses, Collectively Evaluated for Impairment	1,369		1,334
Allowance for Loan Losses, Total	1,540	$ 1,347	1,372	$ 1,300	$ 1,174	$ 722
Recorded Investment in Loans, Individually Evaluated for Impairment	513		430
Recorded Investment in Loans, Collectively Evaluated for Impairment	72,377		69,110
Loans receivable	72,890		69,540
SBA PPP Loans
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	0		0
Allowance for Loan Losses, Total	0		0
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	95,633		126,820
Loans receivable	$ 95,633		$ 126,820

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

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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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