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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, 2021	Dec. 31, 2020	Sep. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	$ 73		$ 41
Allowance for Loan Losses, Collectively Evaluated for Impairment	13,361		13,373
Allowance for Loan Losses, Total	13,434	$ 13,432	13,414	$ 11,890	$ 9,882	$ 9,690
Recorded Investment in Loans, Individually Evaluated for Impairment	5,169		5,773
Recorded Investment in Loans, Collectively Evaluated for Impairment	1,045,947		1,027,952
Loans receivable	1,051,116		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	1,151		1,160
Allowance for Loan Losses, Total	1,151	1,135	1,163	1,149	1,065	1,167
Recorded Investment in Loans, Individually Evaluated for Impairment	896		1,143
Recorded Investment in Loans, Collectively Evaluated for Impairment	116,288		117,437
Loans receivable	117,184		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	784		718
Allowance for Loan Losses, Total	784	757	718	595	499	481
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	92,435		85,053
Loans receivable	92,435		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	7,238		7,144
Allowance for Loan Losses, Total	7,238	7,136	7,144	5,762	4,410	4,154
Recorded Investment in Loans, Individually Evaluated for Impairment	3,028		3,242
Recorded Investment in Loans, Collectively Evaluated for Impairment	458,938		450,332
Loans receivable	461,966		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	695		832
Allowance for Loan Losses, Total	695	770	832	697	754	755
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	62,973		75,332
Loans receivable	62,973		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	148		158
Allowance for Loan Losses, Total	148	182	158	204	248	212
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	7,336		7,108
Loans receivable	7,336		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	714		420
Allowance for Loan Losses, Total	714	558	420	423	403	338
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	34,217		20,927
Loans receivable	34,217		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	323		238
Allowance for Loan Losses, Total	323	186	238	394	333	375
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	15,739		10,832
Loans receivable	15,739		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	19		133
Allowance for Loan Losses, Total	19	123	133	80	48	67
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	623		4,739
Loans receivable	623		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	407		572
Allowance for Loan Losses, Total	407	474	572	678	654	697
Recorded Investment in Loans, Individually Evaluated for Impairment	173		394
Recorded Investment in Loans, Collectively Evaluated for Impairment	18,868		25,177
Loans receivable	19,041		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	552		593
Allowance for Loan Losses, Total	552	605	593	656	609	623
Recorded Investment in Loans, Individually Evaluated for Impairment	537		555
Recorded Investment in Loans, Collectively Evaluated for Impairment	31,489		31,522
Loans receivable	32,026		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	57	71	78	87	99
Recorded Investment in Loans, Individually Evaluated for Impairment	8		9
Recorded Investment in Loans, Collectively Evaluated for Impairment	2,748		3,563
Loans receivable	2,756		3,572
Commercial business loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	73		38
Allowance for Loan Losses, Collectively Evaluated for Impairment	1,274		1,334
Allowance for Loan Losses, Total	1,347	1,449	1,372	$ 1,174	$ 772	$ 722
Recorded Investment in Loans, Individually Evaluated for Impairment	527		430
Recorded Investment in Loans, Collectively Evaluated for Impairment	66,118		69,110
Loans receivable	66,645		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	0
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	138,175		126,820
Loans receivable	$ 138,175		$ 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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