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Loans Receivable And Allowance For Loan Losses: Schedule of Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	$ 17,288	$ 17,478	$ 16,655	$ 17,478	$ 15,817
Provision for (Recapture of) Credit Losses	237		166	289	545
Charge- offs	(2)		(4)	(245)	(6)
Recoveries	2		1	3	1
Allowance for loan losses, Ending Allowance	17,525	17,288	16,818	17,525	16,818
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance					461
One-to four-family
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	2,699	2,632	2,096	2,632	2,417
Provision for (Recapture of) Credit Losses	101		89	168	176
Charge- offs	0		0	0	0
Recoveries	0		0	0	0
Allowance for loan losses, Ending Allowance	2,800	2,699	2,185	2,800	2,185
One-to four-family | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance					(408)
Multi-family
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	1,311	1,308	1,200	1,308	1,156
Provision for (Recapture of) Credit Losses	4		158	7	322
Charge- offs	0		0	0	0
Recoveries	0		0	0	0
Allowance for loan losses, Ending Allowance	1,315	1,311	1,358	1,315	1,358
Multi-family | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance					(120)
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	6,892	6,934	6,822	6,934	7,209
Provision for (Recapture of) Credit Losses	91		132	49	239
Charge- offs	0		0	0	0
Recoveries	0		0	0	0
Allowance for loan losses, Ending Allowance	6,983	6,892	6,954	6,983	6,954
Commercial real estate | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance					(494)
Construction-custom & owner/builder (1)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	1,261	1,328	1,234	1,328	750
Provision for (Recapture of) Credit Losses	(44)		(19)	(111)	(77)
Charge- offs	0		0	0	0
Recoveries	0		0	0	0
Allowance for loan losses, Ending Allowance	1,217	1,261	1,215	1,217	1,215
Construction-custom & owner/builder (1) | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance					542
Construction-speculative one-to four-family (1)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	82	128	132	128	148
Provision for (Recapture of) Credit Losses	7		10	(39)	10
Charge- offs	0		0	0	0
Recoveries	0		0	0	0
Allowance for loan losses, Ending Allowance	89	82	142	89	142
Construction-speculative one-to four-family (1) | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance					(16)
Construction-commercial (1)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	329	537	430	537	316
Provision for (Recapture of) Credit Losses	29		21	(179)	(41)
Charge- offs	0		0	0	0
Recoveries	0		0	0	0
Allowance for loan losses, Ending Allowance	358	329	451	358	451
Construction-commercial (1) | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance					176
Construction-multi-family (1)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	527	456	735	456	602
Provision for (Recapture of) Credit Losses	16		(257)	87	(328)
Charge- offs	0		0	0	0
Recoveries	0		0	0	0
Allowance for loan losses, Ending Allowance	543	527	478	543	478
Construction-multi-family (1) | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance					204
Construction-land development (1)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	292	335	298	335	274
Provision for (Recapture of) Credit Losses	83		(43)	40	(44)
Charge- offs	0			0
Recoveries	0		0	0	0
Allowance for loan losses, Ending Allowance	375	292	255	375	255
Construction-land development (1) | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance					25
Land
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	802	793	757	793	406
Provision for (Recapture of) Credit Losses	50		83	59	116
Charge- offs	0		0	0	0
Recoveries	0		0	0	0
Allowance for loan losses, Ending Allowance	852	802	840	852	840
Land | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance					318
Home equity and second mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	353	348	286	348	519
Provision for (Recapture of) Credit Losses	(8)		19	(3)	29
Charge- offs	0		0	0	0
Recoveries	0		0	0	0
Allowance for loan losses, Ending Allowance	345	353	305	345	305
Home equity and second mortgage | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance					(243)
Consumer loans, other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	34	39	46	39	53
Provision for (Recapture of) Credit Losses	1		3	(2)	5
Charge- offs	(2)		(4)	(4)	(6)
Recoveries	0		0	0	0
Allowance for loan losses, Ending Allowance	33	34	45	33	45
Consumer loans, other | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance					(7)
Commercial business
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	2,706	2,640	2,619	2,640	1,967
Provision for (Recapture of) Credit Losses	(93)		(30)	213	138
Charge- offs	0		0	(241)	0
Recoveries	2		1	3	1
Allowance for loan losses, Ending Allowance	$ 2,615	$ 2,706	$ 2,590	$ 2,615	2,590
Commercial business | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance					$ 484

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (d)
-Publisher FASB
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Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 20
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
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