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Loans Receivable And Allowance For Loan Losses: Schedule of Loans receivable and Loans held for sale (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	$ 796,786	$ 784,794
Undisbursed portion of construction loans in process	79,449	82,411
Deferred loan origination fees, net	2,504	2,466
Allowance for loan losses	9,565	9,553
Less: Loans in process, Deferred fees and Allowance for loan losses	91,518	94,430
Loans receivable, net	$ 705,268	$ 690,364	[1]
Ratio of loan category to total loans receivable (percent)	100.00%	100.00%
Total mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 709,768	$ 698,107
Ratio of loan category to total loans receivable (percent)	89.10%	88.90%
Mortgage loans, one-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 116,976	$ 118,147
Ratio of loan category to total loans receivable (percent)	14.60%	15.10%
Mortgage loans, multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 61,366	$ 58,607
Ratio of loan category to total loans receivable (percent)	7.70%	7.50%
Mortgage loans, commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 333,085	$ 328,927
Ratio of loan category to total loans receivable (percent)	41.80%	41.90%
Mortgage loans, construction - custom and owner/builder
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 123,365	$ 117,641
Ratio of loan category to total loans receivable (percent)	15.50%	15.00%
Mortgage loans, construction - speculative one-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 7,253	$ 9,918
Ratio of loan category to total loans receivable (percent)	0.90%	1.20%
Mortgage loans, construction – commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 22,000	$ 19,630
Ratio of loan category to total loans receivable (percent)	2.80%	2.50%
Mortgage loans, construction - Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 24,601	$ 21,327
Ratio of loan category to total loans receivable (percent)	3.10%	2.70%
Mortgage loans, land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 21,122	$ 23,910
Ratio of loan category to total loans receivable (percent)	2.70%	3.00%
Total consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	$ 43,025	$ 42,243
Ratio of loan category to total loans receivable (percent)	5.40%	5.40%
Consumer loans, home equity and second mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	$ 38,975	$ 38,420
Ratio of loan category to total loans receivable (percent)	4.90%	4.90%
Consumer loans, other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	$ 4,050	$ 3,823
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 (2)	$ 43,993	$ 44,444
Ratio of loan category to total loans receivable (percent)	5.50%	5.70%
[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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