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Loans Receivable and Allowance for Loan Losses: Schedule of Allowance for Loan Losses (Details) - USD ($)	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	$ 17,478,000	$ 15,817,000	$ 13,703,000
Provision for credit losses - loans	853,000	1,254,000	2,132,000
Charge-offs	(247,000)	(101,000)	(19,000)
Recoveries	7,000	47,000	1,000
Allowance for loan losses, Ending Allowance	18,091,000	17,478,000	15,817,000
Impact of Adopting CECL (ASU 2016-13)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance		461,000
Allowance for loan losses, Ending Allowance			461,000
Mortgage loans, one-to-four family
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	2,632,000	2,417,000	1,658,000
Provision for credit losses - loans	260,000	580,000	759,000
Charge-offs	0	0	0
Recoveries	0	43,000	0
Allowance for loan losses, Ending Allowance	2,892,000	2,632,000	2,417,000
Mortgage loans, one-to-four family | Impact of Adopting CECL (ASU 2016-13)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance		(408,000)
Allowance for loan losses, Ending Allowance			(408,000)
Mortgage loans, multi-family
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	1,308,000	1,156,000	855,000
Provision for credit losses - loans	317,000	272,000	301,000
Charge-offs	0	0	0
Recoveries	0	0	0
Allowance for loan losses, Ending Allowance	1,625,000	1,308,000	1,156,000
Mortgage loans, multi-family | Impact of Adopting CECL (ASU 2016-13)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance		(120,000)
Allowance for loan losses, Ending Allowance			(120,000)
Mortgage loans, commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	6,934,000	7,209,000	6,682,000
Provision for credit losses - loans	213,000	219,000	527,000
Charge-offs	0	0	0
Recoveries	0	0	0
Allowance for loan losses, Ending Allowance	7,147,000	6,934,000	7,209,000
Mortgage loans, commercial | Impact of Adopting CECL (ASU 2016-13)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance		(494,000)
Allowance for loan losses, Ending Allowance			(494,000)
Mortgage loans, construction - custom and owner/builder
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	1,328,000	750,000	675,000
Provision for credit losses - loans	(60,000)	36,000	75,000
Charge-offs	0	0	0
Recoveries	0	0	0
Allowance for loan losses, Ending Allowance	1,268,000	1,328,000	750,000
Mortgage loans, construction - custom and owner/builder | Impact of Adopting CECL (ASU 2016-13)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance		542,000
Allowance for loan losses, Ending Allowance			542,000
Mortgage loans, construction - speculative one-to-four family
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	128,000	148,000	130,000
Provision for credit losses - loans	(16,000)	(4,000)	18,000
Charge-offs	0	0	0
Recoveries	0	0	0
Allowance for loan losses, Ending Allowance	112,000	128,000	148,000
Mortgage loans, construction - speculative one-to-four family | Impact of Adopting CECL (ASU 2016-13)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance		(16,000)
Allowance for loan losses, Ending Allowance			(16,000)
Mortgage loans, construction - commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	537,000	316,000	343,000
Provision for credit losses - loans	(189,000)	45,000	(27,000)
Charge-offs	0	0	0
Recoveries	0	0	0
Allowance for loan losses, Ending Allowance	348,000	537,000	316,000
Mortgage loans, construction - commercial | Impact of Adopting CECL (ASU 2016-13)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance		176,000
Allowance for loan losses, Ending Allowance			176,000
Mortgage loans, construction - multi-family
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	456,000	602,000	447,000
Provision for credit losses - loans	(56,000)	(350,000)	155,000
Charge-offs	0	0	0
Recoveries	0	0	0
Allowance for loan losses, Ending Allowance	400,000	456,000	602,000
Mortgage loans, construction - multi-family | Impact of Adopting CECL (ASU 2016-13)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance		204,000
Allowance for loan losses, Ending Allowance			204,000
Mortgage loans - construction - land development
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	335,000	274,000	233,000
Provision for credit losses - loans	77,000	36,000	41,000
Charge-offs	0	0	0
Recoveries	0	0	0
Allowance for loan losses, Ending Allowance	412,000	335,000	274,000
Mortgage loans - construction - land development | Impact of Adopting CECL (ASU 2016-13)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance		25,000
Allowance for loan losses, Ending Allowance			25,000
Mortgage loans, land
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	793,000	406,000	397,000
Provision for credit losses - loans	4,000	69,000	9,000
Charge-offs	0	0	0
Recoveries	0	0	0
Allowance for loan losses, Ending Allowance	797,000	793,000	406,000
Mortgage loans, land | Impact of Adopting CECL (ASU 2016-13)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance		318,000
Allowance for loan losses, Ending Allowance			318,000
Consumer loans, home equity and second mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	348,000	519,000	440,000
Provision for credit losses - loans	87,000	72,000	79,000
Charge-offs	0	0	0
Recoveries	0	0	0
Allowance for loan losses, Ending Allowance	435,000	348,000	519,000
Consumer loans, home equity and second mortgage | Impact of Adopting CECL (ASU 2016-13)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance		(243,000)
Allowance for loan losses, Ending Allowance			(243,000)
Consumer loans, other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	39,000	53,000	42,000
Provision for credit losses - loans	24,000	2,000	14,000
Charge-offs	(6,000)	(9,000)	(4,000)
Recoveries	1,000	0	1,000
Allowance for loan losses, Ending Allowance	58,000	39,000	53,000
Consumer loans, other | Impact of Adopting CECL (ASU 2016-13)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance		(7,000)
Allowance for loan losses, Ending Allowance			(7,000)
Commercial business loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	2,640,000	1,967,000	1,801,000
Provision for credit losses - loans	192,000	277,000	181,000
Charge-offs	(241,000)	(92,000)	(15,000)
Recoveries	6,000	4,000	0
Allowance for loan losses, Ending Allowance	$ 2,597,000	2,640,000	1,967,000
Commercial business loans | Impact of Adopting CECL (ASU 2016-13)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance		$ 484,000
Allowance for loan losses, Ending Allowance			$ 484,000

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- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

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Amount of writeoff of financing receivable, charged against allowance for credit loss.

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Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease.

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