Loans Receivable And Allowance For Loan Losses: Schedule of Loans receivable and Loans held for sale (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Sep. 30, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	$ 1,385,685	$ 1,253,618
Undisbursed portion of construction loans in process	104,774	103,168
Deferred loan origination fees, net	4,957	4,321
Allowance for loan losses	15,307	13,703
Less: Loans in process, Deferred fees and Allowance for loan losses	125,038	121,192
Loans receivable, net	$ 1,260,647	$ 1,132,426	[1]
Ratio of loan category to total loans receivable (percent)	100.00%	100.00%
Mortgage loans excluded	$ 0	$ 748
Total mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 1,205,575	$ 1,090,263
Ratio of loan category to total loans receivable (percent)	87.00%	86.90%
Mortgage loans, one-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 229,274	$ 176,116
Ratio of loan category to total loans receivable (percent)	16.50%	14.10%
Mortgage loans, multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 111,777	$ 95,025
Ratio of loan category to total loans receivable (percent)	8.10%	7.60%
Mortgage loans, commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 557,015	$ 536,650
Ratio of loan category to total loans receivable (percent)	40.20%	42.80%
Mortgage loans, construction - custom and owner/builder
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 136,595	$ 119,240
Ratio of loan category to total loans receivable (percent)	9.80%	9.50%
Mortgage loans, construction - speculative one-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 12,522	$ 12,254
Ratio of loan category to total loans receivable (percent)	0.90%	1.00%
Mortgage loans, construction – commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 42,657	$ 40,364
Ratio of loan category to total loans receivable (percent)	3.10%	3.20%
Mortgage loans, construction - Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 73,859	$ 64,480
Ratio of loan category to total loans receivable (percent)	5.30%	5.10%
Mortgage loans, construction - Land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 15,968	$ 19,280
Ratio of loan category to total loans receivable (percent)	1.20%	1.50%
Mortgage loans, land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans	$ 25,908	$ 26,854
Ratio of loan category to total loans receivable (percent)	1.90%	2.10%
Total consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	$ 42,477	$ 37,315
Ratio of loan category to total loans receivable (percent)	3.10%	3.00%
Consumer loans, home equity and second mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	$ 40,008	$ 35,187
Ratio of loan category to total loans receivable (percent)	2.90%	2.80%
Consumer loans, other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	$ 2,469	$ 2,128
Ratio of loan category to total loans receivable (percent)	0.20%	0.20%
Commercial business loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial business loans	$ 137,114	$ 125,039
Ratio of loan category to total loans receivable (percent)	9.90%	10.00%
SBA PPP Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial business loans	$ 519	$ 1,001
Ratio of loan category to total loans receivable (percent)	0.00%	0.10%
Total Commercial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial business loans	$ 137,633	$ 126,040
Ratio of loan category to total loans receivable (percent)	9.90%	10.10%

[1] Derived from audited consolidated financial statements.