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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, 2021	Sep. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	$ 1,141,666	$ 1,134,283
Undisbursed portion of construction  loans in process	90,550	100,558
Deferred loan origination fees, net	6,999	6,436
Allowance for loan losses	13,434	13,414
Less: Loans in process, Deferred fees and Allowance for loan losses	110,983	120,408
Loans receivable, net	$ 1,030,683	$ 1,013,875	[1]
Ratio of loan category to total loans receivable (percent)	100.00%	100.00%
Mortgage loans excluded	$ 8,455	$ 4,509
Total mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 902,064	$ 902,274
Ratio of loan category to total loans receivable (percent)	79.10%	79.60%
Mortgage loans, one-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 117,184	$ 118,580
Ratio of loan category to total loans receivable (percent)	10.30%	10.50%
Mortgage loans, multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 92,435	$ 85,053
Ratio of loan category to total loans receivable (percent)	8.10%	7.50%
Mortgage loans, commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 461,966	$ 453,574
Ratio of loan category to total loans receivable (percent)	40.50%	40.00%
Mortgage loans, construction - custom and owner/builder
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 105,305	$ 129,572
Ratio of loan category to total loans receivable (percent)	9.20%	11.40%
Mortgage loans, construction - speculative one-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 17,289	$ 14,592
Ratio of loan category to total loans receivable (percent)	1.50%	1.30%
Mortgage loans, construction – commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 42,340	$ 33,144
Ratio of loan category to total loans receivable (percent)	3.70%	2.90%
Mortgage loans, construction - Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 44,266	$ 34,476
Ratio of loan category to total loans receivable (percent)	3.90%	3.00%
Mortgage loans, construction - Land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 2,238	$ 7,712
Ratio of loan category to total loans receivable (percent)	0.20%	0.70%
Mortgage loans, land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 19,041	$ 25,571
Ratio of loan category to total loans receivable (percent)	1.70%	2.30%
Total consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	$ 34,782	$ 35,649
Ratio of loan category to total loans receivable (percent)	3.00%	3.10%
Consumer loans, home equity and second mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	$ 32,026	$ 32,077
Ratio of loan category to total loans receivable (percent)	2.80%	2.80%
Consumer loans, other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	$ 2,756	$ 3,572
Ratio of loan category to total loans receivable (percent)	0.20%	0.30%
Commercial business loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial business loans	$ 66,645	$ 69,540
Ratio of loan category to total loans receivable (percent)	5.80%	6.10%
SBA PPP Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial business loans	$ 138,175	$ 126,820
Ratio of loan category to total loans receivable (percent)	12.10%	11.20%
Total Commercial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial business loans	$ 204,820	$ 196,360
Ratio of loan category to total loans receivable (percent)	17.90%	17.30%
[1] Derived from audited consolidated financial statements.

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