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Loans Receivable and Allowance for Loan Losses: Financing Receivable Credit Quality Indicators (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	$ 1,033,725	$ 899,150
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	1,012,666	877,552
Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	11,546	13,731
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	5,864	2,547
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	3,649	5,320
Mortgage loans, one-to-four family
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	118,580	132,661
Mortgage loans, one-to-four family | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	115,992	129,748
Mortgage loans, one-to-four family | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	1,369	296
Mortgage loans, one-to-four family | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	551	562
Mortgage loans, one-to-four family | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	668	2,055
Mortgage loans, multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	85,053	76,036
Mortgage loans, multi-family | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	85,053	76,036
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	453,574	419,117
Mortgage loans, commercial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	441,037	405,165
Mortgage loans, commercial | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	7,712	11,944
Mortgage loans, commercial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	3,447	683
Mortgage loans, commercial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	1,378	1,325
Mortgage loans, construction - custom and owner/builder
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	75,332	75,411
Mortgage loans, construction - custom and owner/builder | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	74,529	75,178
Mortgage loans, construction - custom and owner/builder | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	803	233
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	7,108	10,779
Mortgage loans, construction - speculative one-to-four family | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	7,108	10,779
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	20,927	24,051
Mortgage loans, construction - commercial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	19,525	24,051
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	1,402	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	10,832	19,256
Mortgage loans, construction - multi-family | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	10,832	19,256
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	4,739	1,803
Mortgage loans - construction - land development | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	4,701	1,659
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	38	144
Mortgage loans, land
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	25,571	30,770
Mortgage loans, land | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	23,290	28,390
Mortgage loans, land | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	1,518	952
Mortgage loans, land | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	370	1,217
Mortgage loans, land | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	393	211
Consumer loans, home equity and second mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	32,077	40,190
Consumer loans, home equity and second mortgage | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	31,344	39,364
Consumer loans, home equity and second mortgage | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	53	41
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	680	785
Consumer loans, other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	3,572	4,312
Consumer loans, other | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	3,531	4,257
Consumer loans, other | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	32	33
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	9	22
Commercial business loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	69,540	64,764
Commercial business loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	68,904	63,669
Commercial business loans | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	59	232
Commercial business loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	94	85
Commercial business loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	483	$ 778
SBA PPP Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	126,820
SBA PPP Loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	126,820
SBA PPP Loans | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0
SBA PPP Loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0
SBA PPP Loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	$ 0

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