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Loans Receivable and Allowance for Loan Losses: Impaired Financing Receivables (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	$ 4,282	$ 4,568	$ 5,041
Impaired Financing Receivable, with Related Allowance, Recorded Investment	250	656	732
Impaired Financing Receivable, Recorded Investment	4,532	5,224	5,773
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off)	4,375	4,615	5,129
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off)	250	656	732
Impaired Financing Receivable, Unpaid Principal Balance (Loan Balance Plus Charge Off)	4,625	5,271	5,861
Impaired Financing Receivable, Related Allowance	127	247	41
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	4,567	4,750	5,251
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	413	454	681
Impaired Financing Receivable, Average Recorded Investment	4,980	5,204	5,932
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized	189	220	177
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized	0	0	16
Impaired Financing Receivable, Interest Income Recognized	189	220	193
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Impaired Financing Receivable, with No Related Allowance, Cash Basis Interest Income Recognized	159	182	141
Impaired Financing Receivable, with Related Allowance, Cash Basis Interest Income Recognized	0	0	8
Impaired Financing Receivable, Cash Basis Interest Income Recognized	159	182	149
Mortgage loans, one-to-four family
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	388	407	659
Impaired Financing Receivable, with Related Allowance, Recorded Investment		0	484
Impaired Financing Receivable, Recorded Investment	388	407	1,143
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off)	432	450	703
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off)		0	484
Impaired Financing Receivable, Unpaid Principal Balance (Loan Balance Plus Charge Off)	432	450	1,187
Impaired Financing Receivable, Related Allowance	0	0	3
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	470	655	1,127
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		97	194
Impaired Financing Receivable, Average Recorded Investment	470	752	1,321
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized	31	58	44
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized		0	16
Impaired Financing Receivable, Interest Income Recognized	31	58	60
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Impaired Financing Receivable, with No Related Allowance, Cash Basis Interest Income Recognized	31	52	34
Impaired Financing Receivable, with Related Allowance, Cash Basis Interest Income Recognized		0	8
Impaired Financing Receivable, Cash Basis Interest Income Recognized	31	52	42
Mortgage loans, commercial
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	2,988	3,143	3,242
Impaired Financing Receivable, Recorded Investment	2,988	3,143	3,242
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off)	2,988	3,143	3,242
Impaired Financing Receivable, Unpaid Principal Balance (Loan Balance Plus Charge Off)	2,988	3,143	3,242
Impaired Financing Receivable, Related Allowance	0	0	0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	3,041	3,039	3,236
Impaired Financing Receivable, Average Recorded Investment	3,041	3,039	3,236
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized	152	159	133
Impaired Financing Receivable, Interest Income Recognized	152	159	133
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Impaired Financing Receivable, with No Related Allowance, Cash Basis Interest Income Recognized	123	127	107
Impaired Financing Receivable, Cash Basis Interest Income Recognized	123	127	107
Mortgage loans, land
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	450	321	394
Impaired Financing Receivable, with Related Allowance, Recorded Investment		362	0
Impaired Financing Receivable, Recorded Investment	450	683	394
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off)	450	321	438
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off)		362	0
Impaired Financing Receivable, Unpaid Principal Balance (Loan Balance Plus Charge Off)	450	683	438
Impaired Financing Receivable, Related Allowance	0	76	0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	492	292	125
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		72	110
Impaired Financing Receivable, Average Recorded Investment	492	364	235
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized	0	2	0
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized		0	0
Impaired Financing Receivable, Interest Income Recognized	0	2	0
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Impaired Financing Receivable, with No Related Allowance, Cash Basis Interest Income Recognized	0	2	0
Impaired Financing Receivable, with Related Allowance, Cash Basis Interest Income Recognized		0	0
Impaired Financing Receivable, Cash Basis Interest Income Recognized	0	2	0
Consumer loans, home equity and second mortgage
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	394	516	555
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0
Impaired Financing Receivable, Recorded Investment	394	516	555
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off)	394	516	555
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off)	0
Impaired Financing Receivable, Unpaid Principal Balance (Loan Balance Plus Charge Off)	394	516	555
Impaired Financing Receivable, Related Allowance	0	0	0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	436	552	581
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	145
Impaired Financing Receivable, Average Recorded Investment	581	552	581
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized	6	1	0
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized	0
Impaired Financing Receivable, Interest Income Recognized	6	1	0
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Impaired Financing Receivable, with No Related Allowance, Cash Basis Interest Income Recognized	5	1	0
Impaired Financing Receivable, with Related Allowance, Cash Basis Interest Income Recognized	0
Impaired Financing Receivable, Cash Basis Interest Income Recognized	5	1	0
Consumer loans, other
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		17
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off)		17
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment		12
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized		0
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Impaired Financing Receivable, with No Related Allowance, Cash Basis Interest Income Recognized		0
Consumer loans, other
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	3
Impaired Financing Receivable, Recorded Investment	3	17
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off)	3
Impaired Financing Receivable, Unpaid Principal Balance (Loan Balance Plus Charge Off)	3	17
Impaired Financing Receivable, Related Allowance	0	0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	7
Impaired Financing Receivable, Average Recorded Investment	7	12
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized	0
Impaired Financing Receivable, Interest Income Recognized	0	0
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Impaired Financing Receivable, with No Related Allowance, Cash Basis Interest Income Recognized	0
Impaired Financing Receivable, Cash Basis Interest Income Recognized	0	0
Other
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment			9
Impaired Financing Receivable, with Related Allowance, Recorded Investment			0
Impaired Financing Receivable, Recorded Investment			9
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off)			9
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off)			0
Impaired Financing Receivable, Unpaid Principal Balance (Loan Balance Plus Charge Off)			9
Impaired Financing Receivable, Related Allowance			0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment			6
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment			7
Impaired Financing Receivable, Average Recorded Investment			13
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized			0
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized			0
Impaired Financing Receivable, Interest Income Recognized			0
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Impaired Financing Receivable, with No Related Allowance, Cash Basis Interest Income Recognized			0
Impaired Financing Receivable, with Related Allowance, Cash Basis Interest Income Recognized			0
Impaired Financing Receivable, Cash Basis Interest Income Recognized			0
Commercial business loans
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	59	164	182
Impaired Financing Receivable, with Related Allowance, Recorded Investment	250	294	248
Impaired Financing Receivable, Recorded Investment	309	458	430
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off)	108	168	182
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off)	250	294	248
Impaired Financing Receivable, Unpaid Principal Balance (Loan Balance Plus Charge Off)	358	462	430
Impaired Financing Receivable, Related Allowance	127	171	38
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	121	200	176
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	268	285	370
Impaired Financing Receivable, Average Recorded Investment	389	485	546
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized	0	0	0
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized	0	0	0
Impaired Financing Receivable, Interest Income Recognized	0	0	0
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Impaired Financing Receivable, with No Related Allowance, Cash Basis Interest Income Recognized	0	0	0
Impaired Financing Receivable, with Related Allowance, Cash Basis Interest Income Recognized	0	0	0
Impaired Financing Receivable, Cash Basis Interest Income Recognized	$ 0	$ 0	$ 0

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- Definition

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

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Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

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