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Loans Receivable And Allowance For Loan Losses: Schedule of Loans receivable and Loans held for sale (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024		Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	$ 1,541,073		$ 1,514,304
Undisbursed portion of construction loans in process ("LIP")	76,272		69,878
Deferred loan origination fees, net	5,427		5,425
Allowance for loan losses	17,878	$ 17,525	17,478		$ 17,046	$ 16,818	$ 15,817
Less: Loans in process, Deferred fees and Allowance for loan losses	99,577		92,781
Loans receivable, net	$ 1,441,496		$ 1,421,523	[1]
Ratio of loan category to total loans receivable (percent)	100.00%		100.00%
Loans held for sale	$ 1,763		$ 0	[1]
Total mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 1,364,788		$ 1,324,259
Ratio of loan category to total loans receivable (percent)	88.60%		87.40%
One-to four-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 317,574		$ 299,123
Allowance for loan losses	$ 2,893	2,800	$ 2,632		2,277	2,185	2,417
Ratio of loan category to total loans receivable (percent)	20.60%		19.70%
Loans held for sale	$ 1,760		$ 0
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	200,418		177,350
Allowance for loan losses	$ 1,580	1,315	$ 1,308		1,442	1,358	1,156
Ratio of loan category to total loans receivable (percent)	13.00%		11.70%
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 607,924		$ 599,219
Allowance for loan losses	$ 7,163	6,983	$ 6,934		7,195	6,954	7,209
Ratio of loan category to total loans receivable (percent)	39.50%		39.60%
Construction-custom & owner/builder (1)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 128,900		$ 132,101
Allowance for loan losses	$ 1,242	1,217	$ 1,328		1,291	1,215	750
Ratio of loan category to total loans receivable (percent)	8.40%		8.70%
Construction-speculative one-to four-family (1)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 9,595		$ 11,495
Allowance for loan losses	$ 97	89	$ 128		95	142	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	$ 15,992		$ 29,463
Allowance for loan losses	$ 257	358	$ 537		393	451	316
Ratio of loan category to total loans receivable (percent)	1.00%		1.90%
Construction-multi-family (1)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 32,731		$ 28,401
Allowance for loan losses	$ 378	543	$ 456		357	478	602
Ratio of loan category to total loans receivable (percent)	2.10%		1.90%
Construction-land development (1)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 15,461		$ 17,741
Allowance for loan losses	$ 413	375	$ 335		290	255	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	$ 36,193		$ 29,366
Allowance for loan losses	$ 813	852	$ 793		828	840	406
Ratio of loan category to total loans receivable (percent)	2.40%		1.90%
Total consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	$ 49,687		$ 51,042
Ratio of loan category to total loans receivable (percent)	3.20%		3.40%
Home equity and second mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	$ 47,511		$ 47,913
Allowance for loan losses	$ 411	345	$ 348		314	305	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	$ 2,176		$ 3,129
Allowance for loan losses	$ 38	33	$ 39		45	45	53
Ratio of loan category to total loans receivable (percent)	0.10%		0.20%
Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial business loans	$ 126,497		$ 138,743
Allowance for loan losses	$ 2,593	$ 2,615	$ 2,640		$ 2,519	$ 2,590	$ 1,967
Ratio of loan category to total loans receivable (percent)	8.20%		9.20%
SBA PPP
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial business loans	$ 101		$ 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	$ 126,598		$ 139,003
Ratio of loan category to total loans receivable (percent)	8.20%		9.20%
[1] Derived from audited consolidated financial statements.

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