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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, 2019	Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	$ 980,352	$ 820,795
Undisbursed portion of construction loans in process	94,471	83,237
Deferred loan origination fees, net	2,856	2,637
Allowance for loan losses	9,741	9,530
Less: Loans in process, Deferred fees and Allowance for loan losses	107,068	95,404
Loans receivable, net	$ 873,284	$ 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	$ 866,064	$ 736,886
Ratio of loan category to total loans receivable (percent)	88.40%	89.80%
Mortgage loans, one-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 130,413	$ 115,941
Ratio of loan category to total loans receivable (percent)	13.30%	14.10%
Mortgage loans excluded	$ 3,068	$ 1,785
Mortgage loans, multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 74,816	$ 61,928
Ratio of loan category to total loans receivable (percent)	7.60%	7.50%
Mortgage loans, commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 417,223	$ 345,113
Ratio of loan category to total loans receivable (percent)	42.60%	42.00%
Mortgage loans, construction - custom and owner/builder
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 120,789	$ 119,555
Ratio of loan category to total loans receivable (percent)	12.30%	14.60%
Mortgage loans, construction - speculative one-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 20,014	$ 15,433
Ratio of loan category to total loans receivable (percent)	2.00%	1.90%
Mortgage loans, construction – commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 42,157	$ 39,590
Ratio of loan category to total loans receivable (percent)	4.40%	4.80%
Mortgage loans, construction - Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 29,399	$ 10,740
Ratio of loan category to total loans receivable (percent)	3.00%	1.30%
Mortgage loans, construction - Land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 8,782	$ 3,040
Ratio of loan category to total loans receivable (percent)	0.90%	0.40%
Mortgage loans, land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 22,471	$ 25,546
Ratio of loan category to total loans receivable (percent)	2.30%	3.10%
Total consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	$ 46,214	$ 40,856
Ratio of loan category to total loans receivable (percent)	4.70%	5.00%
Consumer loans, home equity and second mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	$ 41,609	$ 37,341
Ratio of loan category to total loans receivable (percent)	4.20%	4.50%
Consumer loans, other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	$ 4,605	$ 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	$ 68,074	$ 43,053
Ratio of loan category to total loans receivable (percent)	6.90%	5.20%
Consumer loans excluded	$ 0	$ 0
[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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