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Loans Receivable and Allowance for Loan Losses: Schedule of Loans receivable and Loans held for sale (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	$ 991,376	$ 820,795
Undisbursed portion of construction loans in process	92,226	83,237
Deferred loan origination fees	2,798	2,637
Allowance for loan losses	9,690	9,530
Less: Loans in process, Deferred fees and Allowance for loan losses	104,714	95,404
Total loans receivable, net	886,662	725,391
Unamortized discounts, loans receivable	1,386
Total mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	882,110	736,886
Mortgage loans, one-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	132,661	115,941
Mortgage loans, multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	76,036	61,928
Mortgage loans, commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	419,117	345,113
Mortgage loans, construction - custom and owner/builder
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	128,848	119,555
Mortgage loans, construction - speculative one-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	16,445	15,433
Mortgage loans, construction - commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	39,566	39,590
Mortgage loans, construction - multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	36,263	10,740
Mortgage loans - construction - land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	2,404	3,040
Mortgage loans, land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	30,770	25,546
Total consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	44,502	40,856
Consumer loans, home equity and second mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	40,190	37,341
Consumer loans, other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	4,312	3,515
Commercial business loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial business loans	$ 64,764	$ 43,053

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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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