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Loans Receivable And Allowance For Loan Losses: Financing Receivable Credit Quality Indicators (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Sep. 30, 2017
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	$ 729,325	$ 702,383
Mortgage loans, one-to-four family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	114,148	118,147
Mortgage loans, multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	58,169	58,607
Mortgage loans, commercial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	345,543	328,927
Mortgage loans, construction - custom and owner/builder
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	66,651	63,538
Mortgage loans, construction - speculative one-to-four family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	5,312	4,639
Mortgage loans, construction – commercial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	21,640	11,016
Mortgage loans, construction - Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	6,526	6,912
Mortgage loans, construction - Land development
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	2,573
Mortgage loans, land
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	23,662	23,910
Consumer loans, home equity and second mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	38,143	38,420
Consumer loans, other
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	3,674	3,823
Commercial business loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	43,284	44,444
Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	711,085	682,391
Pass | Mortgage loans, one-to-four family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	110,784	115,481
Pass | Mortgage loans, multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	58,169	56,857
Pass | Mortgage loans, commercial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	335,497	318,717
Pass | Mortgage loans, construction - custom and owner/builder
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	65,739	63,210
Pass | Mortgage loans, construction - speculative one-to-four family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	5,312	4,639
Pass | Mortgage loans, construction – commercial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	21,640	11,016
Pass | Mortgage loans, construction - Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	6,526	6,912
Pass | Mortgage loans, construction - Land development
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	2,573
Pass | Mortgage loans, land
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	20,610	20,528
Pass | Consumer loans, home equity and second mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	37,559	37,828
Pass | Consumer loans, other
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	3,639	3,787
Pass | Commercial business loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	43,037	43,416
Watch
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	8,925	8,956
Watch | Mortgage loans, one-to-four family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	888	422
Watch | Mortgage loans, multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Watch | Mortgage loans, commercial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	5,961	6,059
Watch | Mortgage loans, construction - custom and owner/builder
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	912	328
Watch | Mortgage loans, construction - speculative one-to-four family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Watch | Mortgage loans, construction – commercial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Watch | Mortgage loans, construction - Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Watch | Mortgage loans, construction - Land development
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0
Watch | Mortgage loans, land
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	996	1,022
Watch | Consumer loans, home equity and second mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	144	152
Watch | Consumer loans, other
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Watch | Commercial business loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	24	973
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	5,596	7,783
Special Mention | Mortgage loans, one-to-four family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	587	644
Special Mention | Mortgage loans, multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	1,750
Special Mention | Mortgage loans, commercial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	3,199	3,540
Special Mention | Mortgage loans, construction - custom and owner/builder
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Special Mention | Mortgage loans, construction - speculative one-to-four family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Special Mention | Mortgage loans, construction – commercial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Special Mention | Mortgage loans, construction - Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Special Mention | Mortgage loans, construction - Land development
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0
Special Mention | Mortgage loans, land
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,761	1,794
Special Mention | Consumer loans, home equity and second mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Special Mention | Consumer loans, other
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Special Mention | Commercial business loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	49	55
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	3,719	3,253
Substandard | Mortgage loans, one-to-four family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,889	1,600
Substandard | Mortgage loans, multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Substandard | Mortgage loans, commercial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	886	611
Substandard | Mortgage loans, construction - custom and owner/builder
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Substandard | Mortgage loans, construction - speculative one-to-four family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Substandard | Mortgage loans, construction – commercial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Substandard | Mortgage loans, construction - Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Substandard | Mortgage loans, construction - Land development
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0
Substandard | Mortgage loans, land
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	295	566
Substandard | Consumer loans, home equity and second mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	440	440
Substandard | Consumer loans, other
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	35	36
Substandard | Commercial business loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	$ 174	$ 0

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