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Loans Receivable And Allowance For Loan Losses: Past Due Status of Loans (Details) - USD ($) $ in Thousands		Mar. 31, 2025		Sep. 30, 2024
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		$ 1,442,928		$ 1,444,426
Loans receivable, Non-Accrual	[1]	2,327		3,885
One-to four-family
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		315,421		299,123
Loans receivable, Non-Accrual	[1]	47		49
Multi-family
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		178,590		177,350
Loans receivable, Non-Accrual	[1]	0		0
Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		602,248		599,219
Loans receivable, Non-Accrual	[1]	324		1,158
Construction-custom & owner/builder (1)
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		73,900		81,274
Loans receivable, Non-Accrual	[1]	0		0
Construction-speculative one-to four-family (1)
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		5,167		7,451
Loans receivable, Non-Accrual	[1]	0		0
Construction-commercial (1)
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		15,762		23,812
Loans receivable, Non-Accrual	[1]	0		0
Construction-multi-family (1)
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		24,767		20,757
Loans receivable, Non-Accrual	[1]	0		0
Construction-land development (1)
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		13,540		16,029
Loans receivable, Non-Accrual	[1]	0		0
Land
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		32,301		29,366
Loans receivable, Non-Accrual	[1]	0		0
Home equity and second mortgage
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		47,458		47,913
Loans receivable, Non-Accrual	[1]	575		618
Consumer loans, other
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		2,375		3,129
Loans receivable, Non-Accrual	[1]	0		0
Commercial business
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		131,243		138,743
Loans receivable, Non-Accrual		1,381	[1]	2,060
SBA PPP
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		156		260
Loans receivable, Non-Accrual	[1]	0		0
30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		996		424
30 to 59 Days Past Due | One-to four-family
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
30 to 59 Days Past Due | Multi-family
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
30 to 59 Days Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		976		0
30 to 59 Days Past Due | Construction-custom & owner/builder (1)
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
30 to 59 Days Past Due | Construction-speculative one-to four-family (1)
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
30 to 59 Days Past Due | Construction-commercial (1)
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
30 to 59 Days Past Due | Construction-multi-family (1)
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
30 to 59 Days Past Due | Construction-land development (1)
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
30 to 59 Days Past Due | Land
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
30 to 59 Days Past Due | Home equity and second mortgage
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
30 to 59 Days Past Due | Consumer loans, other
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
30 to 59 Days Past Due | Commercial business
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		20		424
30 to 59 Days Past Due | SBA PPP
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		170
60 to 89 Days Past Due | One-to four-family
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
60 to 89 Days Past Due | Multi-family
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
60 to 89 Days Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
60 to 89 Days Past Due | Construction-custom & owner/builder (1)
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
60 to 89 Days Past Due | Construction-speculative one-to four-family (1)
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
60 to 89 Days Past Due | Construction-commercial (1)
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
60 to 89 Days Past Due | Construction-multi-family (1)
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
60 to 89 Days Past Due | Construction-land development (1)
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
60 to 89 Days Past Due | Land
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
60 to 89 Days Past Due | Home equity and second mortgage
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
60 to 89 Days Past Due | Consumer loans, other
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		1
60 to 89 Days Past Due | Commercial business
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		169
60 to 89 Days Past Due | SBA PPP
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
Past Due 90 Days or More and Still Accruing
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Still Accruing		0		0
Past Due 90 Days or More and Still Accruing | One-to four-family
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Still Accruing		0		0
Past Due 90 Days or More and Still Accruing | Multi-family
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Still Accruing		0		0
Past Due 90 Days or More and Still Accruing | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Still Accruing		0		0
Past Due 90 Days or More and Still Accruing | Construction-custom & owner/builder (1)
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Still Accruing		0		0
Past Due 90 Days or More and Still Accruing | Construction-speculative one-to four-family (1)
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Still Accruing		0		0
Past Due 90 Days or More and Still Accruing | Construction-commercial (1)
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Still Accruing		0		0
Past Due 90 Days or More and Still Accruing | Construction-multi-family (1)
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Still Accruing		0		0
Past Due 90 Days or More and Still Accruing | Construction-land development (1)
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Still Accruing		0		0
Past Due 90 Days or More and Still Accruing | Land
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Still Accruing		0		0
Past Due 90 Days or More and Still Accruing | Home equity and second mortgage
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Still Accruing		0		0
Past Due 90 Days or More and Still Accruing | Consumer loans, other
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Still Accruing		0		0
Past Due 90 Days or More and Still Accruing | Commercial business
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Still Accruing		0		0
Past Due 90 Days or More and Still Accruing | SBA PPP
Financing Receivable, Past Due [Line Items]
Past Due 90 Days or More and Still Accruing		0		0
Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		3,323		4,479
Financial Asset, Past Due | One-to four-family
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		47		49
Financial Asset, Past Due | Multi-family
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
Financial Asset, Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		1,300		1,158
Financial Asset, Past Due | Construction-custom & owner/builder (1)
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
Financial Asset, Past Due | Construction-speculative one-to four-family (1)
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
Financial Asset, Past Due | Construction-commercial (1)
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
Financial Asset, Past Due | Construction-multi-family (1)
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
Financial Asset, Past Due | Construction-land development (1)
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
Financial Asset, Past Due | Land
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
Financial Asset, Past Due | Home equity and second mortgage
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		575		618
Financial Asset, Past Due | Consumer loans, other
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		1
Financial Asset, Past Due | Commercial business
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		1,401		2,653
Financial Asset, Past Due | SBA PPP
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		1,439,605		1,439,947
Financial Asset, Not Past Due | One-to four-family
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		315,374		299,074
Financial Asset, Not Past Due | Multi-family
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		178,590		177,350
Financial Asset, Not Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		600,948		598,061
Financial Asset, Not Past Due | Construction-custom & owner/builder (1)
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		73,900		81,274
Financial Asset, Not Past Due | Construction-speculative one-to four-family (1)
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		5,167		7,451
Financial Asset, Not Past Due | Construction-commercial (1)
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		15,762		23,812
Financial Asset, Not Past Due | Construction-multi-family (1)
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		24,767		20,757
Financial Asset, Not Past Due | Construction-land development (1)
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		13,540		16,029
Financial Asset, Not Past Due | Land
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		32,301		29,366
Financial Asset, Not Past Due | Home equity and second mortgage
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		46,883		47,295
Financial Asset, Not Past Due | Consumer loans, other
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		2,375		3,128
Financial Asset, Not Past Due | Commercial business
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		129,842		136,090
Financial Asset, Not Past Due | SBA PPP
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		$ 156		$ 260
[1] Includes non-accrual loans past due 90 days or more and other loans classified as non-accrual.(2) Net of construction LIP.

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Amortized cost excluding accrued interest, of financing receivable 90 days or more past due and still accruing. Excludes net investment in lease.

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Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

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