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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, 2021	Sep. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	$ 1,111,705	$ 1,134,283
Undisbursed portion of construction  loans in process	90,332	100,558
Deferred loan origination fees, net	6,339	6,436
Allowance for loan losses	13,469	13,414
Less: Loans in process, Deferred fees and Allowance for loan losses	110,140	120,408
Loans receivable, net	$ 1,001,565	$ 1,013,875	[1]
Ratio of loan category to total loans receivable (percent)	100.00%	100.00%
Mortgage loans excluded	$ 3,359	$ 4,509
Total mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 908,566	$ 902,274
Ratio of loan category to total loans receivable (percent)	81.60%	79.60%
Mortgage loans, one-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 119,173	$ 118,580
Ratio of loan category to total loans receivable (percent)	10.70%	10.50%
Mortgage loans, multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 94,756	$ 85,053
Ratio of loan category to total loans receivable (percent)	8.50%	7.50%
Mortgage loans, commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 458,889	$ 453,574
Ratio of loan category to total loans receivable (percent)	41.30%	40.00%
Mortgage loans, construction - custom and owner/builder
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 105,484	$ 129,572
Ratio of loan category to total loans receivable (percent)	9.50%	11.40%
Mortgage loans, construction - speculative one-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 18,038	$ 14,592
Ratio of loan category to total loans receivable (percent)	1.60%	1.30%
Mortgage loans, construction – commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 43,879	$ 33,144
Ratio of loan category to total loans receivable (percent)	3.90%	2.90%
Mortgage loans, construction - Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 45,624	$ 34,476
Ratio of loan category to total loans receivable (percent)	4.10%	3.00%
Mortgage loans, construction - Land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 4,434	$ 7,712
Ratio of loan category to total loans receivable (percent)	0.40%	0.70%
Mortgage loans, land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 18,289	$ 25,571
Ratio of loan category to total loans receivable (percent)	1.60%	2.30%
Total consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	$ 34,616	$ 35,649
Ratio of loan category to total loans receivable (percent)	3.10%	3.10%
Consumer loans, home equity and second mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	$ 31,891	$ 32,077
Ratio of loan category to total loans receivable (percent)	2.90%	2.80%
Consumer loans, other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	$ 2,725	$ 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	$ 72,890	$ 69,540
Ratio of loan category to total loans receivable (percent)	6.70%	6.10%
SBA PPP Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial business loans	$ 95,633	$ 126,820
Ratio of loan category to total loans receivable (percent)	8.60%	11.20%
Total Commercial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial business loans	$ 168,523	$ 196,360
Ratio of loan category to total loans receivable (percent)	15.30%	17.30%
[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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