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Loans Receivable and Allowance for Loan Losses: Financing Receivable Credit Quality Indicators (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	$ 702,383	$ 675,201
Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	682,391	644,423
Watch
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	8,956	10,677
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	7,783	15,065
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	3,253	5,036
Mortgage loans, one-to-four family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	118,147	118,560
Mortgage loans, one-to-four family | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	115,481	115,131
Mortgage loans, one-to-four family | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	422	364
Mortgage loans, one-to-four family | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	644	661
Mortgage loans, one-to-four family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,600	2,404
Mortgage loans, multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	58,607	62,303
Mortgage loans, multi-family | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	56,857	60,504
Mortgage loans, multi-family | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Mortgage loans, multi-family | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,750	1,799
Mortgage loans, multi-family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Mortgage loans, commercial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	328,927	312,525
Mortgage loans, commercial | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	318,717	292,756
Mortgage loans, commercial | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	6,059	8,411
Mortgage loans, commercial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	3,540	10,746
Mortgage loans, commercial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	611	612
Mortgage loans, construction - custom and owner/builder
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	63,538	52,029
Mortgage loans, construction - custom and owner/builder | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	63,210	51,432
Mortgage loans, construction - custom and owner/builder | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	328	229
Mortgage loans, construction - custom and owner/builder | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Mortgage loans, construction - custom and owner/builder | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	368
Mortgage loans, construction - speculative one-to-four family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	4,639	4,074
Mortgage loans, construction - speculative one-to-four family | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	4,639	4,074
Mortgage loans, construction - speculative one-to-four family | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Mortgage loans, construction - speculative one-to-four family | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Mortgage loans, construction - speculative one-to-four family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Mortgage loans, construction - commercial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	11,016	6,841
Mortgage loans, construction - commercial | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	11,016	6,841
Mortgage loans, construction - commercial | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Mortgage loans, construction - commercial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Mortgage loans, construction - commercial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Mortgage loans, construction - multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	6,912	11,539
Mortgage loans, construction - multi-family | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	6,912	11,539
Mortgage loans, construction - multi-family | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Mortgage loans, construction - multi-family | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Mortgage loans, construction - multi-family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Mortgage loans, land
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	23,910	21,627
Mortgage loans, land | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	20,528	18,010
Mortgage loans, land | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,022	1,043
Mortgage loans, land | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,794	1,859
Mortgage loans, land | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	566	715
Consumer loans, home equity and second mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	38,420	39,727
Consumer loans, home equity and second mortgage | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	37,828	38,261
Consumer loans, home equity and second mortgage | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	152	590
Consumer loans, home equity and second mortgage | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Consumer loans, home equity and second mortgage | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	440	876
Consumer loans, other
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	3,823	4,139
Consumer loans, other | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	3,787	4,078
Consumer loans, other | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Consumer loans, other | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Consumer loans, other | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	36	61
Commercial business loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	44,444	41,837
Commercial business loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	43,416	41,797
Commercial business loans | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	973	40
Commercial business loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	55	0
Commercial business loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	$ 0	$ 0

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