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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, 2021	Sep. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	$ 1,118,023	$ 1,082,290
Undisbursed portion of construction loans in process	106,009	95,224
Deferred loan origination fees, net	4,539	5,143
Allowance for loan losses	13,468	13,469
Less: Loans in process, Deferred fees and Allowance for loan losses	124,016	113,836
Loans receivable, net	$ 994,007	$ 968,454	[1]
Ratio of loan category to total loans receivable (percent)	100.00%	100.00%
Mortgage loans excluded	$ 3,700	$ 3,217
Total mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 974,783	$ 931,289
Ratio of loan category to total loans receivable (percent)	87.20%	86.00%
Mortgage loans, one-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 129,151	$ 119,935
Ratio of loan category to total loans receivable (percent)	11.60%	11.10%
Mortgage loans, multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 84,180	$ 87,563
Ratio of loan category to total loans receivable (percent)	7.50%	8.10%
Mortgage loans, commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 497,361	$ 470,650
Ratio of loan category to total loans receivable (percent)	44.50%	43.50%
Mortgage loans, construction - custom and owner/builder
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 116,267	$ 109,152
Ratio of loan category to total loans receivable (percent)	10.40%	10.10%
Mortgage loans, construction - speculative one-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 18,255	$ 17,813
Ratio of loan category to total loans receivable (percent)	1.60%	1.60%
Mortgage loans, construction – commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 42,611	$ 43,365
Ratio of loan category to total loans receivable (percent)	3.80%	4.00%
Mortgage loans, construction - Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 54,710	$ 52,071
Ratio of loan category to total loans receivable (percent)	4.90%	4.80%
Mortgage loans, construction - Land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 13,680	$ 10,804
Ratio of loan category to total loans receivable (percent)	1.20%	1.00%
Mortgage loans, land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 18,568	$ 19,936
Ratio of loan category to total loans receivable (percent)	1.70%	1.80%
Total consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	$ 36,837	$ 35,500
Ratio of loan category to total loans receivable (percent)	3.30%	3.30%
Consumer loans, home equity and second mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	$ 34,375	$ 32,988
Ratio of loan category to total loans receivable (percent)	3.10%	3.10%
Consumer loans, other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	$ 2,462	$ 2,512
Ratio of loan category to total loans receivable (percent)	0.20%	0.20%
Commercial business loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial business loans	$ 85,006	$ 74,579
Ratio of loan category to total loans receivable (percent)	7.60%	6.90%
SBA PPP Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial business loans	$ 21,397	$ 40,922
Ratio of loan category to total loans receivable (percent)	1.90%	3.80%
Total Commercial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial business loans	$ 106,403	$ 115,501
Ratio of loan category to total loans receivable (percent)	9.50%	10.70%
[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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