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Loans Receivable And Allowance For Loan Losses: Past Due Status of Loans (Details) - USD ($) $ in Thousands		Dec. 31, 2023		Sep. 30, 2023
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		$ 1,358,275		$ 1,323,364
Loans receivable, Non-Accrual	[1]	3,366		1,514
One-to four-family
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		263,122		253,227
Loans receivable, Non-Accrual	[1]	602		368
Multi-family
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		147,321		127,176
Loans receivable, Non-Accrual	[1]	0		0
Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		579,038		568,265
Loans receivable, Non-Accrual	[1]	683		683
Construction-custom & owner/builder
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		70,111		73,239
Loans receivable, Non-Accrual	[1]	150		0
Construction-speculative one-to four-family
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		9,403		9,361
Loans receivable, Non-Accrual	[1]	0		0
Construction-commercial
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		22,793		26,030
Loans receivable, Non-Accrual	[1]	0		0
Construction-multi-family
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		41,465		45,890
Loans receivable, Non-Accrual	[1]	0		0
Construction-land development
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		16,631		16,129
Loans receivable, Non-Accrual	[1]	0		0
Land
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		28,697		26,726
Loans receivable, Non-Accrual	[1]	0		0
Home equity
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		39,403		38,281
Loans receivable, Non-Accrual	[1]	171		177
Consumer loans, other
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		2,926		2,772
Loans receivable, Non-Accrual	[1]	0		0
Commercial business
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		136,942		135,802
Loans receivable, Non-Accrual		1,760	[1]	286
SBA PPP
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		423		466
Loans receivable, Non-Accrual		0		0	[1]
30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		66		151
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		0		0
30 to 59 Days Past Due | Construction-custom & owner/builder
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		151
30 to 59 Days Past Due | Construction-speculative one-to four-family
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
30 to 59 Days Past Due | Construction-commercial
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
30 to 59 Days Past Due | Construction-multi-family
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
30 to 59 Days Past Due | Construction-land development
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
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		66		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		0		0
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		171		0
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
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
60 to 89 Days Past Due | Construction-speculative one-to four-family
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
60 to 89 Days Past Due | Construction-commercial
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
60 to 89 Days Past Due | Construction-multi-family
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
60 to 89 Days Past Due | Construction-land development
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
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		0
60 to 89 Days Past Due | Commercial business
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		171		0
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
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
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
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
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
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
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		3,603		1,665
Financial Asset, Past Due | One-to four-family
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		602		368
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		683		683
Financial Asset, Past Due | Construction-custom & owner/builder
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		150		151
Financial Asset, Past Due | Construction-speculative one-to four-family
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
Financial Asset, Past Due | Construction-commercial
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
Financial Asset, Past Due | Construction-multi-family
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
Financial Asset, Past Due | Construction-land development
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
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		237		177
Financial Asset, Past Due | Consumer loans, other
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		0		0
Financial Asset, Past Due | Commercial business
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		1,931		286
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		1,354,672		1,321,699
Financial Asset, Not Past Due | One-to four-family
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		262,520		252,859
Financial Asset, Not Past Due | Multi-family
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		147,321		127,176
Financial Asset, Not Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		578,355		567,582
Financial Asset, Not Past Due | Construction-custom & owner/builder
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		69,961		73,088
Financial Asset, Not Past Due | Construction-speculative one-to four-family
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		9,403		9,361
Financial Asset, Not Past Due | Construction-commercial
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		22,793		26,030
Financial Asset, Not Past Due | Construction-multi-family
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		41,465		45,890
Financial Asset, Not Past Due | Construction-land development
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		16,631		16,129
Financial Asset, Not Past Due | Land
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		28,697		26,726
Financial Asset, Not Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		39,166		38,104
Financial Asset, Not Past Due | Consumer loans, other
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		2,926		2,772
Financial Asset, Not Past Due | Commercial business
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		135,011		135,516
Financial Asset, Not Past Due | SBA PPP
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		$ 423		$ 466
[1] Includes non-accrual loans past due 90 days or more and other loans classified as non-accrual.

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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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