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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, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022
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	$ 17,046	$ 16,818	15,817	$ 15,307	$ 14,698	$ 13,703
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
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	2,277	2,185	2,417	2,178	2,052	1,658
Recorded Investment in Loans, Individually Evaluated for Impairment			368
Recorded Investment in Loans, Collectively Evaluated for Impairment			252,859
Loans receivable			253,227
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	1,442	1,358	1,156	1,012	938	855
Recorded Investment in Loans, Individually Evaluated for Impairment			0
Recorded Investment in Loans, Collectively Evaluated for Impairment			127,176
Loans receivable			127,176
Commercial real estate
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	7,195	6,954	7,209	7,029	6,904	6,682
Recorded Investment in Loans, Individually Evaluated for Impairment			2,973
Recorded Investment in Loans, Collectively Evaluated for Impairment			565,292
Loans receivable			568,265
Construction-custom & 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	1,291	1,215	750	799	726	675
Recorded Investment in Loans, Individually Evaluated for Impairment			0
Recorded Investment in Loans, Collectively Evaluated for Impairment			73,239
Loans receivable			73,239
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	95	142	148	110	121	130
Recorded Investment in Loans, Individually Evaluated for Impairment			0
Recorded Investment in Loans, Collectively Evaluated for Impairment			9,361
Loans receivable			9,361
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	393	451	316	291	267	343
Recorded Investment in Loans, Individually Evaluated for Impairment			0
Recorded Investment in Loans, Collectively Evaluated for Impairment			26,030
Loans receivable			26,030
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	357	478	602	692	662	447
Recorded Investment in Loans, Individually Evaluated for Impairment			0
Recorded Investment in Loans, Collectively Evaluated for Impairment			45,890
Loans receivable			45,890
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	290	255	274	233	245	233
Recorded Investment in Loans, Individually Evaluated for Impairment			0
Recorded Investment in Loans, Collectively Evaluated for Impairment			16,129
Loans receivable			16,129
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	828	840	406	389	363	397
Recorded Investment in Loans, Individually Evaluated for Impairment			0
Recorded Investment in Loans, Collectively Evaluated for Impairment			26,726
Loans receivable			26,726
Home equity
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	314	305	519	542	507	440
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	45	45	53	51	47	42
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
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	$ 2,519	$ 2,590	1,967	$ 1,981	$ 1,866	$ 1,801
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
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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