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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, 2023	Sep. 30, 2023	Dec. 31, 2022	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	$ 16,655	15,817	$ 14,229	$ 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	2,096	2,417	1,888	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	1,200	1,156	871	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	6,822	7,209	6,794	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	1,234	750	673	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	132	148	125	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	430	316	323	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	735	602	577	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	298	274	222	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	757	406	383	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	286	519	493	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	46	53	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	$ 2,619	1,967	$ 1,833	$ 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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- Definition

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

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- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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