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Loans Receivable And Allowance For Loan Losses: Financing Receivable Credit Quality Indicators (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	$ 885,881	$ 737,558
Mortgage loans, one-to-four family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	130,413	115,941
Mortgage loans, multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	74,816	61,928
Mortgage loans, commercial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	417,223	345,113
Mortgage loans, construction - custom and owner/builder
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	66,622	67,024
Mortgage loans, construction - speculative one-to-four family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	11,296	7,107
Mortgage loans, construction – commercial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	27,752	23,440
Mortgage loans, construction - Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	13,595	5,983
Mortgage loans, construction - Land development
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	7,405	1,567
Mortgage loans, land
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	22,471	25,546
Consumer loans, home equity and second mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	41,609	37,341
Consumer loans, other
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	4,605	3,515
Commercial business loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	68,074	43,053
Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	867,027	720,600
Pass | Mortgage loans, one-to-four family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	127,202	113,148
Pass | Mortgage loans, multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	74,816	61,928
Pass | Mortgage loans, commercial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	406,675	334,908
Pass | Mortgage loans, construction - custom and owner/builder
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	66,391	66,720
Pass | Mortgage loans, construction - speculative one-to-four family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	11,296	7,107
Pass | Mortgage loans, construction – commercial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	27,752	23,440
Pass | Mortgage loans, construction - Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	13,595	5,983
Pass | Mortgage loans, construction - Land development
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	7,178	1,567
Pass | Mortgage loans, land
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	19,806	22,810
Pass | Consumer loans, home equity and second mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	40,994	36,697
Pass | Consumer loans, other
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	4,556	3,480
Pass | Commercial business loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	66,766	42,812
Watch
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	10,570	10,653
Watch | Mortgage loans, one-to-four family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	699	882
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	8,285	8,375
Watch | Mortgage loans, construction - custom and owner/builder
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	231	304
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	0
Watch | Mortgage loans, land
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	968	988
Watch | Consumer loans, home equity and second mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	79	82
Watch | Consumer loans, other
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	34	0
Watch | Commercial business loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	274	22
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	2,630	3,123
Special Mention | Mortgage loans, one-to-four family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	567	581
Special Mention | Mortgage loans, multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Special Mention | Mortgage loans, commercial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	696	988
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	0
Special Mention | Mortgage loans, land
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,236	1,505
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	131	49
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	5,654	3,182
Substandard | Mortgage loans, one-to-four family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,945	1,330
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	1,567	842
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	227	0
Substandard | Mortgage loans, land
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	461	243
Substandard | Consumer loans, home equity and second mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	536	562
Substandard | Consumer loans, other
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	15	35
Substandard | Commercial business loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	$ 903	$ 170

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Loans Receivable, Including Loans Held-For-Sale and Loans in Process, Gross

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