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Loans Receivable And Allowance For Loan Losses: Financing Receivable Credit Quality Indicators (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Sep. 30, 2016
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	$ 681,167	$ 675,201
Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	651,179	644,423
Watch
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	10,381	10,677
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	15,198	15,065
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	4,409	5,036
Mortgage loans, one-to-four family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	119,485	118,560
Mortgage loans, one-to-four family | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	116,242	115,131
Mortgage loans, one-to-four family | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	357	364
Mortgage loans, one-to-four family | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	657	661
Mortgage loans, one-to-four family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	2,229	2,404
Mortgage loans, multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	52,062	62,303
Mortgage loans, multi-family | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	50,275	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	1,787	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	323,496	312,525
Mortgage loans, commercial | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	304,358	292,756
Mortgage loans, commercial | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	8,363	8,411
Mortgage loans, commercial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	10,775	10,746
Mortgage loans, commercial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	612
Mortgage loans, construction - custom and owner/builder
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	53,548	52,029
Mortgage loans, construction - custom and owner/builder | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	53,181	51,432
Mortgage loans, construction - custom and owner/builder | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	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	367	368
Mortgage loans, construction - speculative one-to-four family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	3,118	4,074
Mortgage loans, construction - speculative one-to-four family | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	3,118	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	6,860	6,841
Mortgage loans, construction – commercial | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	6,860	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	15,457	11,539
Mortgage loans, construction - Multi-family | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	15,457	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	22,359	21,627
Mortgage loans, land | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	18,581	18,010
Mortgage loans, land | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,036	1,043
Mortgage loans, land | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,843	1,859
Mortgage loans, land | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	899	715
Consumer loans, home equity and second mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	37,602	39,727
Consumer loans, home equity and second mortgage | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	36,024	38,261
Consumer loans, home equity and second mortgage | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	588	590
Consumer loans, home equity and second mortgage | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	136	0
Consumer loans, home equity and second mortgage | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	854	876
Consumer loans, other
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	4,523	4,139
Consumer loans, other | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	4,463	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	60	61
Commercial business loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	42,657	41,837
Commercial business loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	42,620	41,797
Commercial business loans | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	37	40
Commercial business loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Commercial business loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	$ 0	$ 0

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