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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	9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Mar. 31, 2025	Jun. 30, 2025	Jun. 30, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	$ 17,525	$ 16,818	$ 17,478	$ 17,478	$ 15,817
Provision for (Recapture of) Credit Losses	351	264		640	810
Charge- Offs	0	(81)		(245)	(87)
Recoveries	2	45		5	45
Allowance for loan losses, Ending Allowance	17,878	17,046	17,525	17,878	17,046
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	2,800	2,185	2,632	2,632	2,417
Provision for (Recapture of) Credit Losses	93	49		261	225
Charge- Offs	0	0		0	0
Recoveries	0	43		0	43
Allowance for loan losses, Ending Allowance	2,893	2,277	2,800	2,893	2,277
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	1,315	1,358	1,308	1,308	1,156
Provision for (Recapture of) Credit Losses	265	84		272	406
Charge- Offs	0	0		0	0
Recoveries	0	0		0	0
Allowance for loan losses, Ending Allowance	1,580	1,442	1,315	1,580	1,442
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	6,983	6,954	6,934	6,934	7,209
Provision for (Recapture of) Credit Losses	180	241		229	480
Charge- Offs	0	0		0	0
Recoveries	0	0		0	0
Allowance for loan losses, Ending Allowance	7,163	7,195	6,983	7,163	7,195
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	1,217	1,215	1,328	1,328	750
Provision for (Recapture of) Credit Losses	25	76		(86)	(1)
Charge- Offs	0	0		0	0
Recoveries	0	0		0	0
Allowance for loan losses, Ending Allowance	1,242	1,291	1,217	1,242	1,291
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	89	142	128	128	148
Provision for (Recapture of) Credit Losses	8	(47)		(31)	(37)
Charge- Offs	0	0		0	0
Recoveries	0	0		0	0
Allowance for loan losses, Ending Allowance	97	95	89	97	95
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	358	451	537	537	316
Provision for (Recapture of) Credit Losses	(101)	(58)		(280)	(99)
Charge- Offs	0	0		0	0
Recoveries	0	0		0	0
Allowance for loan losses, Ending Allowance	257	393	358	257	393
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	543	478	456	456	602
Provision for (Recapture of) Credit Losses	(165)	(121)		(78)	(449)
Charge- Offs	0	0		0	0
Recoveries	0	0		0	0
Allowance for loan losses, Ending Allowance	378	357	543	378	357
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	375	255	335	335	274
Provision for (Recapture of) Credit Losses	38	35		78	(9)
Charge- Offs	0	0		0
Recoveries	0	0		0	0
Allowance for loan losses, Ending Allowance	413	290	375	413	290
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	852	840	793	793	406
Provision for (Recapture of) Credit Losses	(39)	(12)		20	104
Charge- Offs	0	0		0	0
Recoveries	0	0		0	0
Allowance for loan losses, Ending Allowance	813	828	852	813	828
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	345	305	348	348	519
Provision for (Recapture of) Credit Losses	66	9		63	38
Charge- Offs	0	0		0	0
Recoveries	0	0		0	0
Allowance for loan losses, Ending Allowance	411	314	345	411	314
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	33	45	39	39	53
Provision for (Recapture of) Credit Losses	4	2		2	7
Charge- Offs	0	(2)		(4)	(8)
Recoveries	1	0		1	0
Allowance for loan losses, Ending Allowance	38	45	33	38	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	2,615	2,590	2,640	2,640	1,967
Provision for (Recapture of) Credit Losses	(23)	6		190	145
Charge- Offs	0	(79)		(241)	(79)
Recoveries	1	2		4	2
Allowance for loan losses, Ending Allowance	$ 2,593	$ 2,519	$ 2,615	$ 2,593	2,519
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

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-SubTopic 20
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-Section 50
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-Publisher FASB
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