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Loans Receivable And Allowance For Loan Losses: Schedule of Loans receivable and Loans held for sale (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Sep. 30, 2024		Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	$ 1,517,970		$ 1,514,304
Undisbursed portion of construction loans in process ("LIP")	75,042		69,878
Deferred loan origination fees, net	5,329		5,425
Allowance for loan losses	17,525	$ 17,288	17,478		$ 16,818	$ 16,655	$ 15,817
Less: Loans in process, Deferred fees and Allowance for loan losses	97,896		92,781
Loans receivable, net	$ 1,420,074		$ 1,421,523	[1]
Ratio of loan category to total loans receivable (percent)	100.00%		100.00%
Loans held for sale	$ 1,151		$ 0	[1]
Total mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 1,336,738		$ 1,324,259
Ratio of loan category to total loans receivable (percent)	88.10%		87.40%
One-to four-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 315,421		$ 299,123
Allowance for loan losses	$ 2,800	2,699	$ 2,632		2,185	2,096	2,417
Ratio of loan category to total loans receivable (percent)	20.80%		19.70%
Loans held for sale	$ 1,200		$ 0
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	178,590		177,350
Allowance for loan losses	$ 1,315	1,311	$ 1,308		1,358	1,200	1,156
Ratio of loan category to total loans receivable (percent)	11.80%		11.70%
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 602,248		$ 599,219
Allowance for loan losses	$ 6,983	6,892	$ 6,934		6,954	6,822	7,209
Ratio of loan category to total loans receivable (percent)	39.70%		39.60%
Construction-custom & owner/builder (1)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 114,401		$ 132,101
Allowance for loan losses	$ 1,217	1,261	$ 1,328		1,215	1,234	750
Ratio of loan category to total loans receivable (percent)	7.50%		8.70%
Construction-speculative one-to four-family (1)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 9,791		$ 11,495
Allowance for loan losses	$ 89	82	$ 128		142	132	148
Ratio of loan category to total loans receivable (percent)	0.60%		0.80%
Construction-commercial (1)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 22,352		$ 29,463
Allowance for loan losses	$ 358	329	$ 537		451	430	316
Ratio of loan category to total loans receivable (percent)	1.50%		1.90%
Construction-multi-family (1)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 46,602		$ 28,401
Allowance for loan losses	$ 543	527	$ 456		478	735	602
Ratio of loan category to total loans receivable (percent)	3.10%		1.90%
Construction-land development (1)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 15,032		$ 17,741
Allowance for loan losses	$ 375	292	$ 335		255	298	274
Ratio of loan category to total loans receivable (percent)	1.00%		1.20%
Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 32,301		$ 29,366
Allowance for loan losses	$ 852	802	$ 793		840	757	406
Ratio of loan category to total loans receivable (percent)	2.10%		1.90%
Total consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	$ 49,833		$ 51,042
Ratio of loan category to total loans receivable (percent)	3.30%		3.40%
Home equity and second mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	$ 47,458		$ 47,913
Allowance for loan losses	$ 345	353	$ 348		305	286	519
Ratio of loan category to total loans receivable (percent)	3.10%		3.20%
Consumer loans, other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	$ 2,375		$ 3,129
Allowance for loan losses	$ 33	34	$ 39		45	46	53
Ratio of loan category to total loans receivable (percent)	0.20%		0.20%
Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial business loans	$ 131,243		$ 138,743
Allowance for loan losses	$ 2,615	$ 2,706	$ 2,640		$ 2,590	$ 2,619	$ 1,967
Ratio of loan category to total loans receivable (percent)	8.60%		9.20%
SBA PPP
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial business loans	$ 156		$ 260
Ratio of loan category to total loans receivable (percent)	0.00%		0.00%
Total Commercial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial business loans	$ 131,399		$ 139,003
Ratio of loan category to total loans receivable (percent)	8.60%		9.20%
[1] Derived from audited consolidated financial statements.

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