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Loans Receivable And Allowance For Loan Losses: Schedule of Loans receivable and Loans held for sale (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Sep. 30, 2024		Dec. 31, 2023	Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	$ 1,519,901	$ 1,514,304
Undisbursed portion of construction loans in process ("LIP")	85,350	69,878
Deferred loan origination fees, net	5,444	5,425
Allowance for loan losses	17,288	17,478		$ 16,655	$ 15,817
Less: Loans in process, Deferred fees and Allowance for loan losses	108,082	92,781
Loans receivable, net	$ 1,411,819	$ 1,421,523	[1]
Ratio of loan category to total loans receivable (percent)	100.00%	100.00%
Total mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 1,332,645	$ 1,324,259
Ratio of loan category to total loans receivable (percent)	87.70%	87.40%
One-to four-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 306,443	$ 299,123
Allowance for loan losses	$ 2,699	$ 2,632		2,096	2,417
Ratio of loan category to total loans receivable (percent)	20.20%	19.70%
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 177,861	$ 177,350
Allowance for loan losses	$ 1,311	$ 1,308		1,200	1,156
Ratio of loan category to total loans receivable (percent)	11.70%	11.70%
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 597,054	$ 599,219
Allowance for loan losses	$ 6,892	$ 6,934		6,822	7,209
Ratio of loan category to total loans receivable (percent)	39.30%	39.60%
Construction-custom & owner/builder (1)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 124,104	$ 132,101
Allowance for loan losses	$ 1,261	$ 1,328		1,234	750
Ratio of loan category to total loans receivable (percent)	8.20%	8.70%
Construction-speculative one-to four-family (1)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 8,887	$ 11,495
Allowance for loan losses	$ 82	$ 128		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	$ 22,841	$ 29,463
Allowance for loan losses	$ 329	$ 537		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	$ 48,940	$ 28,401
Allowance for loan losses	$ 527	$ 456		735	602
Ratio of loan category to total loans receivable (percent)	3.20%	1.90%
Construction-land development (1)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 15,977	$ 17,741
Allowance for loan losses	$ 292	$ 335		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	$ 30,538	$ 29,366
Allowance for loan losses	$ 802	$ 793		757	406
Ratio of loan category to total loans receivable (percent)	2.00%	1.90%
Total consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	$ 51,740	$ 51,042
Ratio of loan category to total loans receivable (percent)	3.40%	3.40%
Home equity and second mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	$ 48,851	$ 47,913
Allowance for loan losses	$ 353	$ 348		286	519
Ratio of loan category to total loans receivable (percent)	3.20%	3.20%
Consumer loans, other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	$ 2,889	$ 3,129
Allowance for loan losses	$ 33	$ 39		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	$ 135,312	$ 138,743
Allowance for loan losses	$ 2,707	$ 2,640		$ 2,619	$ 1,967
Ratio of loan category to total loans receivable (percent)	8.90%	9.20%
SBA PPP
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial business loans	$ 204	$ 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	$ 135,516	$ 139,003
Ratio of loan category to total loans receivable (percent)	8.90%	9.20%
[1] Derived from audited consolidated financial statements.

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