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Loans Receivable and Allowance for Loan Losses: Financing Receivable Credit Quality Indicators (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	$ 899,150	$ 737,558
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	877,552	720,600
Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	13,731	10,653
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	2,547	3,123
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	5,320	3,182
Mortgage loans, one-to-four family
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	132,661	115,941
Mortgage loans, one-to-four family | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	129,748	113,148
Mortgage loans, one-to-four family | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	296	882
Mortgage loans, one-to-four family | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	562	581
Mortgage loans, one-to-four family | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	2,055	1,330
Mortgage loans, multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	76,036	61,928
Mortgage loans, multi-family | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	76,036	61,928
Mortgage loans, multi-family | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0	0
Mortgage loans, multi-family | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0	0
Mortgage loans, multi-family | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0	0
Mortgage loans, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	419,117	345,113
Mortgage loans, commercial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	405,165	334,908
Mortgage loans, commercial | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	11,944	8,375
Mortgage loans, commercial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	683	988
Mortgage loans, commercial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	1,325	842
Mortgage loans, construction - custom and owner/builder
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	75,411	67,024
Mortgage loans, construction - custom and owner/builder | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	75,178	66,720
Mortgage loans, construction - custom and owner/builder | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	233	304
Mortgage loans, construction - custom and owner/builder | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0	0
Mortgage loans, construction - custom and owner/builder | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0	0
Mortgage loans, construction - speculative one-to-four family
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	10,779	7,107
Mortgage loans, construction - speculative one-to-four family | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	10,779	7,107
Mortgage loans, construction - speculative one-to-four family | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0	0
Mortgage loans, construction - speculative one-to-four family | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0	0
Mortgage loans, construction - speculative one-to-four family | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0	0
Mortgage loans, construction - commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	24,051	23,440
Mortgage loans, construction - commercial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	24,051	23,440
Mortgage loans, construction - commercial | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0	0
Mortgage loans, construction - commercial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0	0
Mortgage loans, construction - commercial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0	0
Mortgage loans, construction - multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	19,256	5,983
Mortgage loans, construction - multi-family | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	19,256	5,983
Mortgage loans, construction - multi-family | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0	0
Mortgage loans, construction - multi-family | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0	0
Mortgage loans, construction - multi-family | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0	0
Mortgage loans - construction - land development
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	1,803	1,567
Mortgage loans - construction - land development | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	1,659	1,567
Mortgage loans - construction - land development | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0	0
Mortgage loans - construction - land development | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0	0
Mortgage loans - construction - land development | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	144	0
Mortgage loans, land
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	30,770	25,546
Mortgage loans, land | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	28,390	22,810
Mortgage loans, land | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	952	988
Mortgage loans, land | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	1,217	1,505
Mortgage loans, land | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	211	243
Consumer loans, home equity and second mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	40,190	37,341
Consumer loans, home equity and second mortgage | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	39,364	36,697
Consumer loans, home equity and second mortgage | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	41	82
Consumer loans, home equity and second mortgage | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0	0
Consumer loans, home equity and second mortgage | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	785	562
Consumer loans, other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	4,312	3,515
Consumer loans, other | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	4,257	3,480
Consumer loans, other | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	33	0
Consumer loans, other | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0	0
Consumer loans, other | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	22	35
Commercial business loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	64,764	43,053
Commercial business loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	63,669	42,812
Commercial business loans | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	232	22
Commercial business loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	85	49
Commercial business loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	$ 778	$ 170

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