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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, 2022	Dec. 31, 2021	Sep. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	$ 127		$ 247
Allowance for Loan Losses, Collectively Evaluated for Impairment	13,306		13,222
Allowance for Loan Losses, Total	13,433	$ 13,468	13,469	$ 13,434	$ 13,432	$ 13,414
Recorded Investment in Loans, Individually Evaluated for Impairment	5,147		5,224
Recorded Investment in Loans, Collectively Evaluated for Impairment	1,046,167		981,842
Loans receivable	1,051,314		987,066
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	1,247		1,154
Allowance for Loan Losses, Total	1,247	1,237	1,154	1,151	1,135	1,163
Recorded Investment in Loans, Individually Evaluated for Impairment	578		407
Recorded Investment in Loans, Collectively Evaluated for Impairment	133,347		119,528
Loans receivable	133,925		119,935
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	735		765
Allowance for Loan Losses, Total	735	748	765	784	757	718
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	82,526		87,563
Loans receivable	82,526		87,563
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	6,931		6,813
Allowance for Loan Losses, Total	6,931	6,807	6,813	7,238	7,136	7,144
Recorded Investment in Loans, Individually Evaluated for Impairment	3,023		3,143
Recorded Investment in Loans, Collectively Evaluated for Impairment	520,456		467,507
Loans receivable	523,479		470,650
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	686		644
Allowance for Loan Losses, Total	686	671	644	695	770	832
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	68,530		61,003
Loans receivable	68,530		61,003
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	126		188
Allowance for Loan Losses, Total	126	153	188	148	182	158
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	7,634		9,657
Loans receivable	7,634		9,657
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	463		784
Allowance for Loan Losses, Total	463	593	784	714	558	420
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	28,005		38,931
Loans receivable	28,005		38,931
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	436		436
Allowance for Loan Losses, Total	436	460	436	323	186	238
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	29,048		22,888
Loans receivable	29,048		22,888
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	126		124
Allowance for Loan Losses, Total	126	157	124	19	123	133
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	6,140		5,502
Loans receivable	6,140		5,502
Mortgage loans, land
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0		76
Allowance for Loan Losses, Collectively Evaluated for Impairment	377		394
Allowance for Loan Losses, Total	377	435	470	407	474	572
Recorded Investment in Loans, Individually Evaluated for Impairment	723		683
Recorded Investment in Loans, Collectively Evaluated for Impairment	21,469		19,253
Loans receivable	22,192		19,936
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	469		528
Allowance for Loan Losses, Total	469	532	528	552	605	593
Recorded Investment in Loans, Individually Evaluated for Impairment	413		516
Recorded Investment in Loans, Collectively Evaluated for Impairment	32,567		32,472
Loans receivable	32,980		32,988
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	44		50
Allowance for Loan Losses, Total	44	48	50	56	57	71
Recorded Investment in Loans, Individually Evaluated for Impairment	5		17
Recorded Investment in Loans, Collectively Evaluated for Impairment	2,272		2,495
Loans receivable	2,277		2,512
Commercial business loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	127		171
Allowance for Loan Losses, Collectively Evaluated for Impairment	1,666		1,342
Allowance for Loan Losses, Total	1,793	$ 1,627	1,513	$ 1,347	$ 1,449	$ 1,372
Recorded Investment in Loans, Individually Evaluated for Impairment	405		458
Recorded Investment in Loans, Collectively Evaluated for Impairment	108,239		74,121
Loans receivable	108,644		74,579
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	5,934		40,922
Loans receivable	$ 5,934		$ 40,922

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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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