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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	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment		$ 123
Allowance for Loan Losses, Collectively Evaluated for Impairment		15,694
Allowance for Loan Losses, Total	$ 17,478	15,817	$ 13,703	$ 13,469
Recorded Investment in Loans, Individually Evaluated for Impairment		4,009
Recorded Investment in Loans, Collectively Evaluated for Impairment		1,319,355
Loans receivable		1,323,364
Mortgage loans, one-to-four family
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment		0
Allowance for Loan Losses, Collectively Evaluated for Impairment		2,417
Allowance for Loan Losses, Total	2,632	2,417	1,658	1,154
Recorded Investment in Loans, Individually Evaluated for Impairment		368
Recorded Investment in Loans, Collectively Evaluated for Impairment		252,859
Loans receivable		253,227
Mortgage loans, multi-family
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment		0
Allowance for Loan Losses, Collectively Evaluated for Impairment		1,156
Allowance for Loan Losses, Total	1,308	1,156	855	765
Recorded Investment in Loans, Individually Evaluated for Impairment		0
Recorded Investment in Loans, Collectively Evaluated for Impairment		127,176
Loans receivable		127,176
Mortgage loans, commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment		0
Allowance for Loan Losses, Collectively Evaluated for Impairment		7,209
Allowance for Loan Losses, Total	6,934	7,209	6,682	6,813
Recorded Investment in Loans, Individually Evaluated for Impairment		2,973
Recorded Investment in Loans, Collectively Evaluated for Impairment		565,292
Loans receivable		568,265
Mortgage loans, construction - custom and owner/builder
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment		0
Allowance for Loan Losses, Collectively Evaluated for Impairment		750
Allowance for Loan Losses, Total	1,328	750	675	644
Recorded Investment in Loans, Individually Evaluated for Impairment		0
Recorded Investment in Loans, Collectively Evaluated for Impairment		73,239
Loans receivable		73,239
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
Allowance for Loan Losses, Collectively Evaluated for Impairment		148
Allowance for Loan Losses, Total	128	148	130	188
Recorded Investment in Loans, Individually Evaluated for Impairment		0
Recorded Investment in Loans, Collectively Evaluated for Impairment		9,361
Loans receivable		9,361
Mortgage loans, construction - commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment		0
Allowance for Loan Losses, Collectively Evaluated for Impairment		316
Allowance for Loan Losses, Total	537	316	343	784
Recorded Investment in Loans, Individually Evaluated for Impairment		0
Recorded Investment in Loans, Collectively Evaluated for Impairment		26,030
Loans receivable		26,030
Mortgage loans, construction - multi-family
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment		0
Allowance for Loan Losses, Collectively Evaluated for Impairment		602
Allowance for Loan Losses, Total	456	602	447	436
Recorded Investment in Loans, Individually Evaluated for Impairment		0
Recorded Investment in Loans, Collectively Evaluated for Impairment		45,890
Loans receivable		45,890
Mortgage loans - construction - land development
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment		0
Allowance for Loan Losses, Collectively Evaluated for Impairment		274
Allowance for Loan Losses, Total	335	274	233	124
Recorded Investment in Loans, Individually Evaluated for Impairment		0
Recorded Investment in Loans, Collectively Evaluated for Impairment		16,129
Loans receivable		16,129
Mortgage loans, land
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment		0
Allowance for Loan Losses, Collectively Evaluated for Impairment		406
Allowance for Loan Losses, Total	793	406	397	470
Recorded Investment in Loans, Individually Evaluated for Impairment		0
Recorded Investment in Loans, Collectively Evaluated for Impairment		26,726
Loans receivable		26,726
Consumer loans, home equity and second mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment		0
Allowance for Loan Losses, Collectively Evaluated for Impairment		519
Allowance for Loan Losses, Total	348	519	440	528
Recorded Investment in Loans, Individually Evaluated for Impairment		382
Recorded Investment in Loans, Collectively Evaluated for Impairment		37,899
Loans receivable		38,281
Consumer loans, other
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment		0
Allowance for Loan Losses, Collectively Evaluated for Impairment		53
Allowance for Loan Losses, Total	39	53	42	50
Recorded Investment in Loans, Individually Evaluated for Impairment		0
Recorded Investment in Loans, Collectively Evaluated for Impairment		2,772
Loans receivable		2,772
Commercial business loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment		123
Allowance for Loan Losses, Collectively Evaluated for Impairment		1,844
Allowance for Loan Losses, Total	$ 2,640	1,967	$ 1,801	$ 1,513
Recorded Investment in Loans, Individually Evaluated for Impairment		286
Recorded Investment in Loans, Collectively Evaluated for Impairment		135,516
Loans receivable		135,802
SBA PPP Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment		0
Allowance for Loan Losses, Collectively Evaluated for Impairment		0
Allowance for Loan Losses, Total		0
Recorded Investment in Loans, Individually Evaluated for Impairment		0
Recorded Investment in Loans, Collectively Evaluated for Impairment		466
Loans receivable		$ 466

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

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