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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, 2017	Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	$ 784,794	$ 723,828
Undisbursed portion of construction loans in process	82,411	48,627
Deferred loan origination fees	2,466	2,229
Allowance for loan losses	9,553	9,826
Less: Loans in process, Deferred fees and Allowance for loan losses	94,430	60,682
Total loans receivable, net	690,364	663,146
Total mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	698,107	638,125
Mortgage loans, one-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	118,147	118,560
Mortgage loans, multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	58,607	62,303
Mortgage loans, commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	328,927	312,525
Mortgage loans, construction - custom and owner/builder
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	117,641	93,049
Mortgage loans, construction - speculative one-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	9,918	8,106
Mortgage loans, construction - commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	19,630	9,365
Mortgage loans, construction - multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	21,327	12,590
Mortgage loans, land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	23,910	21,627
Total consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	42,243	43,866
Consumer loans, home equity and second mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	38,420	39,727
Consumer loans, other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	3,823	4,139
Commercial business loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial business loans	$ 44,444	$ 41,837

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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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