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Loans Receivable And Allowance For Loan Losses: Past Due Status of Loans (Details) - USD ($) $ in Thousands		Mar. 31, 2024		Sep. 30, 2023
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		$ 1,381,113		$ 1,323,364
Loans receivable, Non-Accrual	[1]	3,605		1,514
One-to four-family
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		276,433		253,227
Loans receivable, Non-Accrual	[1]	380		368
Multi-family
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		167,275		127,176
Loans receivable, Non-Accrual	[1]	0		0
Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		577,373		568,265
Loans receivable, Non-Accrual	[1]	1,149		683
Construction-custom & owner/builder
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		70,901		73,239
Loans receivable, Non-Accrual	[1]	152		0
Construction-speculative one-to four-family
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		10,115		9,361
Loans receivable, Non-Accrual	[1]	0		0
Construction-commercial
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		24,320		26,030
Loans receivable, Non-Accrual	[1]	0		0
Construction-multi-family
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		27,125		45,890
Loans receivable, Non-Accrual	[1]	0		0
Construction-land development
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		14,596		16,129
Loans receivable, Non-Accrual	[1]	0		0
Land
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		31,821		26,726
Loans receivable, Non-Accrual	[1]	0		0
Home equity
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		42,357		38,281
Loans receivable, Non-Accrual	[1]	165		177
Consumer loans, other
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		2,925		2,772
Loans receivable, Non-Accrual	[1]	0		0
Commercial business
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		135,505		135,802
Loans receivable, Non-Accrual		1,759	[1]	286
SBA PPP
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		367		466
Loans receivable, Non-Accrual		0		0	[1]
30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		596		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		340		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		256		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		0		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		0		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		4,201		1,665
Financial Asset, Past Due | One-to four-family
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		380		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		1,149		683
Financial Asset, Past Due | Construction-custom & owner/builder
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		152		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		505		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		2,015		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		1,376,912		1,321,699
Financial Asset, Not Past Due | One-to four-family
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		276,053		252,859
Financial Asset, Not Past Due | Multi-family
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		167,275		127,176
Financial Asset, Not Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		576,224		567,582
Financial Asset, Not Past Due | Construction-custom & owner/builder
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		70,749		73,088
Financial Asset, Not Past Due | Construction-speculative one-to four-family
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		10,115		9,361
Financial Asset, Not Past Due | Construction-commercial
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		24,320		26,030
Financial Asset, Not Past Due | Construction-multi-family
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		27,125		45,890
Financial Asset, Not Past Due | Construction-land development
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		14,596		16,129
Financial Asset, Not Past Due | Land
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		31,821		26,726
Financial Asset, Not Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		41,852		38,104
Financial Asset, Not Past Due | Consumer loans, other
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		2,925		2,772
Financial Asset, Not Past Due | Commercial business
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		133,490		135,516
Financial Asset, Not Past Due | SBA PPP
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		$ 367		$ 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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