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Loans Receivable And Allowance For Loan Losses: Financing Receivable Credit Quality Indicators (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Sep. 30, 2018
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	$ 869,478	$ 737,558
Mortgage loans, one-to-four family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	130,219	115,941
Mortgage loans, multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	72,076	61,928
Mortgage loans, commercial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	426,144	345,113
Mortgage loans, construction - custom and owner/builder
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	64,313	67,024
Mortgage loans, construction - speculative one-to-four family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	9,221	7,107
Mortgage loans, construction – commercial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	25,883	23,440
Mortgage loans, construction - Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	9,333	5,983
Mortgage loans, construction - Land development
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	6,442	1,567
Mortgage loans, land
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	22,734	25,546
Consumer loans, home equity and second mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	40,468	37,341
Consumer loans, other
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	4,443	3,515
Commercial business loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	58,202	43,053
Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	852,556	720,600
Pass | Mortgage loans, one-to-four family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	127,116	113,148
Pass | Mortgage loans, multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	72,076	61,928
Pass | Mortgage loans, commercial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	416,329	334,908
Pass | Mortgage loans, construction - custom and owner/builder
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	64,094	66,720
Pass | Mortgage loans, construction - speculative one-to-four family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	9,221	7,107
Pass | Mortgage loans, construction – commercial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	25,883	23,440
Pass | Mortgage loans, construction - Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	9,333	5,983
Pass | Mortgage loans, construction - Land development
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	6,442	1,567
Pass | Mortgage loans, land
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	20,116	22,810
Pass | Consumer loans, home equity and second mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	39,802	36,697
Pass | Consumer loans, other
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	4,409	3,480
Pass | Commercial business loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	57,735	42,812
Watch
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	10,472	10,653
Watch | Mortgage loans, one-to-four family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	707	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	8,332	8,375
Watch | Mortgage loans, construction - custom and owner/builder
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	219	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	979	988
Watch | Consumer loans, home equity and second mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	82	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	119	22
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	2,515	3,123
Special Mention | Mortgage loans, one-to-four family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	574	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	649	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	1,243	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	49	49
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	3,935	3,182
Substandard | Mortgage loans, one-to-four family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,822	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	834	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	0	0
Substandard | Mortgage loans, land
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	396	243
Substandard | Consumer loans, home equity and second mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	584	562
Substandard | Consumer loans, other
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	35
Substandard | Commercial business loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	$ 299	$ 170

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

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