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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, 2024	Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	$ 1,458,615	$ 1,426,558
Undisbursed portion of construction loans in process ("LIP")	77,502	103,194
Deferred loan origination fees, net	5,179	5,242
Allowance for loan losses	16,818	15,817
Less: Loans in process, Deferred fees and Allowance for loan losses	99,499	124,253
Loans receivable, net	$ 1,359,116	$ 1,302,305	[1]
Ratio of loan category to total loans receivable (percent)	100.00%	100.00%
Mortgage loans excluded	$ 1,310	$ 400
Total mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 1,277,461	$ 1,249,237
Ratio of loan category to total loans receivable (percent)	87.60%	87.60%
One-to four-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 276,433	$ 253,227
Ratio of loan category to total loans receivable (percent)	19.00%	17.80%
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 167,275	$ 127,176
Ratio of loan category to total loans receivable (percent)	11.50%	8.90%
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 577,373	$ 568,265
Ratio of loan category to total loans receivable (percent)	39.60%	39.80%
Construction-custom & owner/builder
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 122,988	$ 129,699
Ratio of loan category to total loans receivable (percent)	8.40%	9.10%
Construction-speculative one-to four-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 16,407	$ 17,099
Ratio of loan category to total loans receivable (percent)	1.10%	1.20%
Construction-commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 32,318	$ 51,064
Ratio of loan category to total loans receivable (percent)	2.20%	3.60%
Construction-multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 36,795	$ 57,140
Ratio of loan category to total loans receivable (percent)	2.50%	4.00%
Construction-land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 16,051	$ 18,841
Ratio of loan category to total loans receivable (percent)	1.10%	1.30%
Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 31,821	$ 26,726
Ratio of loan category to total loans receivable (percent)	2.20%	1.90%
Total consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	$ 45,282	$ 41,053
Ratio of loan category to total loans receivable (percent)	3.10%	2.90%
Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	$ 42,357	$ 38,281
Ratio of loan category to total loans receivable (percent)	2.90%	2.70%
Consumer loans, other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	$ 2,925	$ 2,772
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	$ 135,505	$ 135,802
Ratio of loan category to total loans receivable (percent)	9.30%	9.50%
SBA PPP
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial business loans	$ 367	$ 466
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	$ 135,872	$ 136,268
Ratio of loan category to total loans receivable (percent)	9.30%	9.50%
[1] Derived from audited consolidated financial statements.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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