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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	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	$ 254	$ 247
Allowance for Loan Losses, Collectively Evaluated for Impairment	13,214	13,222
Allowance for Loan Losses, Total	13,468	13,469	$ 13,432	$ 13,414
Recorded Investment in Loans, Individually Evaluated for Impairment	5,214	5,224
Recorded Investment in Loans, Collectively Evaluated for Impairment	1,006,800	981,842
Loans receivable	1,012,014	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	1,237	1,154
Allowance for Loan Losses, Total	1,237	1,154	1,135	1,163
Recorded Investment in Loans, Individually Evaluated for Impairment	582	407
Recorded Investment in Loans, Collectively Evaluated for Impairment	128,569	119,528
Loans receivable	129,151	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	748	765
Allowance for Loan Losses, Total	748	765	757	718
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	84,180	87,563
Loans receivable	84,180	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	6,807	6,813
Allowance for Loan Losses, Total	6,807	6,813	7,136	7,144
Recorded Investment in Loans, Individually Evaluated for Impairment	3,037	3,143
Recorded Investment in Loans, Collectively Evaluated for Impairment	494,324	467,507
Loans receivable	497,361	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	671	644
Allowance for Loan Losses, Total	671	644	770	832
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	63,748	61,003
Loans receivable	63,748	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	153	188
Allowance for Loan Losses, Total	153	188	182	158
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	8,760	9,657
Loans receivable	8,760	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	593	784
Allowance for Loan Losses, Total	593	784	558	420
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	32,290	38,931
Loans receivable	32,290	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	460	436
Allowance for Loan Losses, Total	460	436	186	238
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	27,122	22,888
Loans receivable	27,122	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	157	124
Allowance for Loan Losses, Total	157	124	123	133
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	7,594	5,502
Loans receivable	7,594	5,502
Mortgage loans, land
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	78	76
Allowance for Loan Losses, Collectively Evaluated for Impairment	357	394
Allowance for Loan Losses, Total	435	470	474	572
Recorded Investment in Loans, Individually Evaluated for Impairment	675	683
Recorded Investment in Loans, Collectively Evaluated for Impairment	17,893	19,253
Loans receivable	18,568	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	532	528
Allowance for Loan Losses, Total	532	528	605	593
Recorded Investment in Loans, Individually Evaluated for Impairment	456	516
Recorded Investment in Loans, Collectively Evaluated for Impairment	33,919	32,472
Loans receivable	34,375	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	48	50
Allowance for Loan Losses, Total	48	50	57	71
Recorded Investment in Loans, Individually Evaluated for Impairment	5	17
Recorded Investment in Loans, Collectively Evaluated for Impairment	2,457	2,495
Loans receivable	2,462	2,512
Commercial business loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	176	171
Allowance for Loan Losses, Collectively Evaluated for Impairment	1,451	1,342
Allowance for Loan Losses, Total	1,627	1,513	$ 1,449	$ 1,372
Recorded Investment in Loans, Individually Evaluated for Impairment	459	458
Recorded Investment in Loans, Collectively Evaluated for Impairment	84,547	74,121
Loans receivable	85,006	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	21,397	40,922
Loans receivable	$ 21,397	$ 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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