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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, 2020	Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	$ 1,134,283	$ 991,376
Undisbursed portion of construction loans in process	100,558	92,226
Deferred loan origination fees	6,436	2,798
Allowance for loan losses	13,414	9,690
Less: Loans in process, Deferred fees and Allowance for loan losses	120,408	104,714
Total loans receivable, net	1,013,875	886,662
Unamortized discounts, loans receivable	790	1,386
Total mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	902,274	882,110
Mortgage loans, one-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	118,580	132,661
Mortgage loans, multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	85,053	76,036
Mortgage loans, commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	453,574	419,117
Mortgage loans, construction - custom and owner/builder
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	129,572	128,848
Mortgage loans, construction - speculative one-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	14,592	16,445
Mortgage loans, construction - commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	33,144	39,566
Mortgage loans, construction - multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	34,476	36,263
Mortgage loans - construction - land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	7,712	2,404
Mortgage loans, land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	25,571	30,770
Total consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	35,649	44,502
Consumer loans, home equity and second mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	32,077	40,190
Consumer loans, other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	3,572	4,312
Commercial business loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
U.S. Small Business Administration ("SBA") Paycheck Protection Program ("PPP")	69,540	64,764
SBA PPP
Accounts, Notes, Loans and Financing Receivable [Line Items]
U.S. Small Business Administration ("SBA") Paycheck Protection Program ("PPP")	126,820	0
Commercial And PPP Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
U.S. Small Business Administration ("SBA") Paycheck Protection Program ("PPP")	$ 196,360	$ 64,764

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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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