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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, 2019	Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	$ 979,627	$ 820,795
Undisbursed portion of construction loans in process	93,176	83,237
Deferred loan origination fees, net	2,838	2,637
Allowance for loan losses	9,631	9,530
Less: Loans in process, Deferred fees and Allowance for loan losses	105,645	95,404
Loans receivable, net	$ 873,982	$ 725,391	[1]
Ratio of loan category to total loans receivable (percent)	100.00%	100.02239%
Total mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 867,788	$ 736,886
Ratio of loan category to total loans receivable (percent)	88.50%	89.80%
Mortgage loans, one-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 129,050	$ 115,941
Ratio of loan category to total loans receivable (percent)	13.20%	14.10%
Mortgage loans excluded	$ 3,338	$ 1,785
Mortgage loans, multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 70,374	$ 61,928
Ratio of loan category to total loans receivable (percent)	7.20%	7.50%
Mortgage loans, commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 418,778	$ 345,113
Ratio of loan category to total loans receivable (percent)	42.70%	42.00%
Mortgage loans, construction - custom and owner/builder
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 130,516	$ 119,555
Ratio of loan category to total loans receivable (percent)	13.30%	14.60%
Mortgage loans, construction - speculative one-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 18,165	$ 15,433
Ratio of loan category to total loans receivable (percent)	1.90%	1.90%
Mortgage loans, construction – commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 41,805	$ 39,590
Ratio of loan category to total loans receivable (percent)	4.30%	4.80%
Mortgage loans, construction - Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 29,400	$ 10,740
Ratio of loan category to total loans receivable (percent)	2.90%	1.30%
Mortgage loans, construction - Land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 3,047	$ 3,040
Ratio of loan category to total loans receivable (percent)	0.30%	0.40%
Mortgage loans, land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 26,653	$ 25,546
Ratio of loan category to total loans receivable (percent)	2.70%	3.10%
Total consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	$ 46,654	$ 40,856
Ratio of loan category to total loans receivable (percent)	4.80%	5.00%
Consumer loans, home equity and second mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	$ 42,204	$ 37,341
Ratio of loan category to total loans receivable (percent)	4.30%	4.50%
Consumer loans, other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	$ 4,450	$ 3,515
Ratio of loan category to total loans receivable (percent)	0.50%	0.50%
Commercial business loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial business loans	$ 65,185	$ 43,053
Ratio of loan category to total loans receivable (percent)	6.70%	5.20%
Consumer loans excluded	$ 0	$ 0
[1] Derived from audited consolidated financial statements.

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