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Loans Receivable and Allowance for Loan Losses: Financing Receivable Credit Quality Indicators (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	$ 737,558	$ 702,383
Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	720,600	682,391
Watch
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	10,653	8,956
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	3,123	7,783
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	3,182	3,253
Mortgage loans, one-to-four family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	115,941	118,147
Mortgage loans, one-to-four family | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	113,148	115,481
Mortgage loans, one-to-four family | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	882	422
Mortgage loans, one-to-four family | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	581	644
Mortgage loans, one-to-four family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,330	1,600
Mortgage loans, multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	61,928	58,607
Mortgage loans, multi-family | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	61,928	56,857
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	0	1,750
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	345,113	328,927
Mortgage loans, commercial | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	334,908	318,717
Mortgage loans, commercial | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	8,375	6,059
Mortgage loans, commercial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	988	3,540
Mortgage loans, commercial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	842	611
Mortgage loans, construction - custom and owner/builder
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	67,024	63,538
Mortgage loans, construction - custom and owner/builder | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	66,720	63,210
Mortgage loans, construction - custom and owner/builder | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	304	328
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	0
Mortgage loans, construction - speculative one-to-four family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	7,107	4,639
Mortgage loans, construction - speculative one-to-four family | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	7,107	4,639
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	23,440	11,016
Mortgage loans, construction - commercial | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	23,440	11,016
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	5,983	6,912
Mortgage loans, construction - multi-family | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	5,983	6,912
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 - construction - land development
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,567
Mortgage loans - construction - land development | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,567
Mortgage loans - construction - land development | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0
Mortgage loans - construction - land development | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0
Mortgage loans - construction - land development | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0
Mortgage loans, land
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	25,546	23,910
Mortgage loans, land | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	22,810	20,528
Mortgage loans, land | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	988	1,022
Mortgage loans, land | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,505	1,794
Mortgage loans, land | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	243	566
Consumer loans, home equity and second mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	37,341	38,420
Consumer loans, home equity and second mortgage | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	36,697	37,828
Consumer loans, home equity and second mortgage | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	82	152
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	562	440
Consumer loans, other
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	3,515	3,823
Consumer loans, other | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	3,480	3,787
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	35	36
Commercial business loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	43,053	44,444
Commercial business loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	42,812	43,416
Commercial business loans | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	22	973
Commercial business loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	49	55
Commercial business loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	$ 170	$ 0

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