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Loans Receivable and Allowance for Loan Losses: Financing Receivable Credit Quality Indicators (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable		$ 1,323,364
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	$ 1,299,220
Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	17,758
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	6,386
Mortgage loans, one-to-four family
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable		253,227
Mortgage loans, one-to-four family | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	252,859
Mortgage loans, one-to-four family | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0
Mortgage loans, one-to-four family | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0
Mortgage loans, one-to-four family | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	368
Mortgage loans, multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable		127,176
Mortgage loans, multi-family | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	127,176
Mortgage loans, multi-family | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0
Mortgage loans, multi-family | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0
Mortgage loans, multi-family | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0
Mortgage loans, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable		568,265
Mortgage loans, commercial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	551,669
Mortgage loans, commercial | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	11,143
Mortgage loans, commercial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0
Mortgage loans, commercial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	5,453
Mortgage loans, construction - custom and owner/builder
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable		73,239
Mortgage loans, construction - custom and owner/builder | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	68,181
Mortgage loans, construction - custom and owner/builder | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	5,058
Mortgage loans, construction - custom and owner/builder | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0
Mortgage loans, construction - custom and owner/builder | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0
Mortgage loans, construction - speculative one-to-four family
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable		9,361
Mortgage loans, construction - speculative one-to-four family | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	9,361
Mortgage loans, construction - speculative one-to-four family | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0
Mortgage loans, construction - speculative one-to-four family | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0
Mortgage loans, construction - speculative one-to-four family | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0
Mortgage loans, construction - commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable		26,030
Mortgage loans, construction - commercial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	25,063
Mortgage loans, construction - commercial | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	967
Mortgage loans, construction - commercial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0
Mortgage loans, construction - commercial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0
Mortgage loans, construction - multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable		45,890
Mortgage loans, construction - multi-family | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	45,890
Mortgage loans, construction - multi-family | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0
Mortgage loans, construction - multi-family | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0
Mortgage loans, construction - multi-family | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0
Mortgage loans - construction - land development
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable		16,129
Mortgage loans - construction - land development | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	16,129
Mortgage loans - construction - land development | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0
Mortgage loans - construction - land development | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0
Mortgage loans - construction - land development | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0
Mortgage loans, land
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable		26,726
Mortgage loans, land | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	26,226
Mortgage loans, land | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	500
Mortgage loans, land | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0
Mortgage loans, land | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0
Consumer loans, home equity and second mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable		38,281
Consumer loans, home equity and second mortgage | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	37,982
Consumer loans, home equity and second mortgage | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	34
Consumer loans, home equity and second mortgage | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0
Consumer loans, home equity and second mortgage | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	265
Consumer loans, other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable		2,772
Consumer loans, other | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	2,716
Consumer loans, other | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	56
Consumer loans, other | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0
Consumer loans, other | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0
Commercial business loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable		135,802
Commercial business loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	135,502
Commercial business loans | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0
Commercial business loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0
Commercial business loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	300
SBA PPP Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable		$ 466
SBA PPP Loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	466
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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