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Loans Receivable And Allowance For Loan Losses: Schedule of Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Sep. 30, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	$ 17,478	$ 15,817	$ 15,817
Provision for (Recapture of) Credit Losses	52	379
Charge- offs	(244)	(2)
Recoveries	2	0
Allowance for loan losses, Ending Allowance	17,288	16,655	17,478
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance		461	461
One-to four-family
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	2,632	2,417	2,417
Provision for (Recapture of) Credit Losses	67	87
Charge- offs	0	0
Recoveries	0	0
Allowance for loan losses, Ending Allowance	2,699	2,096	2,632
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)	(408)
Multi-family
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	1,308	1,156	1,156
Provision for (Recapture of) Credit Losses	3	164
Charge- offs	0	0
Recoveries	0	0
Allowance for loan losses, Ending Allowance	1,311	1,200	1,308
Multi-family | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance		(120)	(120)
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	6,934	7,209	7,209
Provision for (Recapture of) Credit Losses	(42)	107
Charge- offs	0	0
Recoveries	0	0
Allowance for loan losses, Ending Allowance	6,892	6,822	6,934
Commercial real estate | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance		(494)	(494)
Construction-custom & owner/builder (1)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	1,328	750	750
Provision for (Recapture of) Credit Losses	(67)	(58)
Charge- offs	0	0
Recoveries	0	0
Allowance for loan losses, Ending Allowance	1,261	1,234	1,328
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	542
Construction-speculative one-to four-family (1)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	128	148	148
Provision for (Recapture of) Credit Losses	(46)	0
Charge- offs	0	0
Recoveries	0	0
Allowance for loan losses, Ending Allowance	82	132	128
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)	(16)
Construction-commercial (1)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	537	316	316
Provision for (Recapture of) Credit Losses	(208)	(62)
Charge- offs	0	0
Recoveries	0	0
Allowance for loan losses, Ending Allowance	329	430	537
Construction-commercial (1) | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance		176	176
Construction-multi-family (1)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	456	602	602
Provision for (Recapture of) Credit Losses	71	(71)
Charge- offs	0	0
Recoveries	0	0
Allowance for loan losses, Ending Allowance	527	735	456
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	204
Construction-land development (1)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	335	274	274
Provision for (Recapture of) Credit Losses	(43)	(1)
Charge- offs	0
Recoveries	0	0
Allowance for loan losses, Ending Allowance	292	298	335
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	25
Land
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	793	406	406
Provision for (Recapture of) Credit Losses	9	33
Charge- offs	0	0
Recoveries	0	0
Allowance for loan losses, Ending Allowance	802	757	793
Land | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance		318	318
Home equity and second mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	348	519	519
Provision for (Recapture of) Credit Losses	5	10
Charge- offs	0	0
Recoveries	0	0
Allowance for loan losses, Ending Allowance	353	286	348
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)	(243)
Consumer loans, other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	39	53	53
Provision for (Recapture of) Credit Losses	(3)	2
Charge- offs	(3)	(2)
Recoveries	0	0
Allowance for loan losses, Ending Allowance	33	46	39
Consumer loans, other | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance		(7)	(7)
Commercial business
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	2,640	1,967	1,967
Provision for (Recapture of) Credit Losses	306	168
Charge- offs	(241)	0
Recoveries	2	0
Allowance for loan losses, Ending Allowance	$ 2,707	2,619	2,640
Commercial business | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance		$ 484	$ 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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+ 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

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-Section 50
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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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-Topic 326
-SubTopic 20
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-Section 50
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-Publisher FASB
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