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Loans Receivable And Allowance For Loan Losses: Schedule of Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	$ 16,818	$ 14,698	$ 15,817	$ 13,703
Provision for (Recapture of) Credit Losses	264	610	810	1,610
Charge- offs		(1)	(87)	(7)
Recoveries	45	0	45	1
Allowance for loan losses, Ending Allowance	17,046	15,307	17,046	15,307
Impact of Adopting CECL (ASU 2016-13)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance			461
One-to four-family
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	2,185	2,052	2,417	1,658
Provision for (Recapture of) Credit Losses	49	126	225	520
Charge- offs		0	0	0
Recoveries	43	0	43	0
Allowance for loan losses, Ending Allowance	2,277	2,178	2,277	2,178
One-to four-family | Impact of Adopting CECL (ASU 2016-13)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance			(408)
Multi-family
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	1,358	938	1,156	855
Provision for (Recapture of) Credit Losses	84	74	406	157
Charge- offs		0	0	0
Recoveries	0	0	0	0
Allowance for loan losses, Ending Allowance	1,442	1,012	1,442	1,012
Multi-family | Impact of Adopting CECL (ASU 2016-13)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance			(120)
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	6,954	6,904	7,209	6,682
Provision for (Recapture of) Credit Losses	241	125	480	347
Charge- offs		0	0	0
Recoveries	0	0	0	0
Allowance for loan losses, Ending Allowance	7,195	7,029	7,195	7,029
Commercial real estate | Impact of Adopting CECL (ASU 2016-13)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance			(494)
Construction-custom & owner/builder
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	1,215	726	750	675
Provision for (Recapture of) Credit Losses	76	73	(1)	124
Charge- offs		0	0	0
Recoveries	0	0	0	0
Allowance for loan losses, Ending Allowance	1,291	799	1,291	799
Construction-custom & owner/builder | Impact of Adopting CECL (ASU 2016-13)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance			542
Construction-speculative one-to four-family
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	142	121	148	130
Provision for (Recapture of) Credit Losses	(47)	(11)	(37)	(20)
Charge- offs		0	0	0
Recoveries	0	0	0	0
Allowance for loan losses, Ending Allowance	95	110	95	110
Construction-speculative one-to four-family | Impact of Adopting CECL (ASU 2016-13)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance			(16)
Construction-commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	451	267	316	343
Provision for (Recapture of) Credit Losses	(58)	24	(99)	(52)
Charge- offs		0	0	0
Recoveries	0	0	0	0
Allowance for loan losses, Ending Allowance	393	291	393	291
Construction-commercial | Impact of Adopting CECL (ASU 2016-13)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance			176
Construction-multi-family
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	478	662	602	447
Provision for (Recapture of) Credit Losses	(121)	30	(449)	245
Charge- offs		0	0	0
Recoveries	0	0	0	0
Allowance for loan losses, Ending Allowance	357	692	357	692
Construction-multi-family | Impact of Adopting CECL (ASU 2016-13)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance			204
Construction-land development
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	255	245	274	233
Provision for (Recapture of) Credit Losses	35	(12)	(9)	0
Charge- offs			0	0
Recoveries	0	0	0	0
Allowance for loan losses, Ending Allowance	290	233	290	233
Construction-land development | Impact of Adopting CECL (ASU 2016-13)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance			25
Land
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	840	363	406	397
Provision for (Recapture of) Credit Losses	(12)	26	104	(8)
Charge- offs		0	0	0
Recoveries	0	0	0	0
Allowance for loan losses, Ending Allowance	828	389	828	389
Land | Impact of Adopting CECL (ASU 2016-13)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance			318
Home equity
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	305	507	519	440
Provision for (Recapture of) Credit Losses	9	35	38	102
Charge- offs		0	0	0
Recoveries	0	0	0	0
Allowance for loan losses, Ending Allowance	314	542	314	542
Home equity | Impact of Adopting CECL (ASU 2016-13)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance			(243)
Consumer loans, other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	45	47	53	42
Provision for (Recapture of) Credit Losses	2	5	7	11
Charge- offs		(1)	(8)	(2)
Recoveries	0	0	0	0
Allowance for loan losses, Ending Allowance	45	51	45	51
Consumer loans, other | Impact of Adopting CECL (ASU 2016-13)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance			(7)
Commercial business
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance	2,590	1,866	1,967	1,801
Provision for (Recapture of) Credit Losses	6	115	145	184
Charge- offs		0	(79)	(5)
Recoveries	2	0	2	1
Allowance for loan losses, Ending Allowance	$ 2,519	$ 1,981	2,519	$ 1,981
Commercial business | Impact of Adopting CECL (ASU 2016-13)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance			484
SBA PPP
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Allowance			$ 0

X

- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

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Amount of writeoff of financing receivable, charged against allowance for credit loss.

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Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease.

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