Loans Receivable And Allowance For Loan Losses - Gross Charge-Offs (Details) - USD ($)	3 Months Ended
Jun. 30, 2024	Sep. 30, 2023
Total consumer loans held for investment
Total Loans Receivable	$ 1,419,469,000	$ 1,323,364,000
Current period gross charge-off
Total Loans Receivable	81,000
One-to four-family
Total consumer loans held for investment
Total Loans Receivable	288,611,000	253,227,000
Current period gross charge-off
Total Loans Receivable	0
Multi-family
Total consumer loans held for investment
Total Loans Receivable	177,950,000	127,176,000
Current period gross charge-off
Total Loans Receivable	0
Commercial real estate
Total consumer loans held for investment
Total Loans Receivable	597,865,000	568,265,000
Current period gross charge-off
Total Loans Receivable	0
Construction-custom & owner/builder
Total consumer loans held for investment
Total Loans Receivable	74,525,000	73,239,000
Current period gross charge-off
Total Loans Receivable	0
Construction-speculative one-to four-family
Total consumer loans held for investment
Total Loans Receivable	6,733,000	9,361,000
Current period gross charge-off
Total Loans Receivable	0
Construction-commercial
Total consumer loans held for investment
Total Loans Receivable	21,211,000	26,030,000
Current period gross charge-off
Total Loans Receivable	0
Construction-multi-family
Total consumer loans held for investment
Total Loans Receivable	20,282,000	45,890,000
Current period gross charge-off
Total Loans Receivable	0
Construction-land development
Total consumer loans held for investment
Total Loans Receivable	16,581,000	16,129,000
Current period gross charge-off
Total Loans Receivable	0
Land
Total consumer loans held for investment
Total Loans Receivable	32,384,000	26,726,000
Current period gross charge-off
Total Loans Receivable	0
Home equity
Total consumer loans held for investment
Total Loans Receivable	43,679,000	38,281,000
Current period gross charge-off
Total Loans Receivable	0
Other consumer
Total consumer loans held for investment
Total Loans Receivable	3,121,000	2,772,000
Current period gross charge-off
Total Loans Receivable	2,000
Commercial business
Total consumer loans held for investment
Total Loans Receivable	136,213,000	135,802,000
Current period gross charge-off
Total Loans Receivable	79,000
SBA PPP
Total consumer loans held for investment
Total Loans Receivable	314,000	$ 466,000
Other consumer
Total consumer loans held for investment
2024	99,610
2023	256,996
2022	352,658
2021	193,051
2020	118,854
Prior	314,457
Revolving Loans	83,843
Total Loans Receivable	1,419,469
Current period gross charge-off
2024	5,000
2023	80,000
2022	0
2021	0
2020	0
Prior	0
Revolving Loans	2,000
Total Loans Receivable	87,000
Other consumer \| One-to four-family
Total consumer loans held for investment
2024	7,097
2023	56,150
2022	116,235
2021	49,399
2020	19,427
Prior	40,303
Revolving Loans	0
Total Loans Receivable	288,611
Other consumer \| Multi-family
Total consumer loans held for investment
2024	13,134
2023	19,474
2022	39,836
2021	33,292
2020	27,002
Prior	44,042
Revolving Loans	1,170
Total Loans Receivable	177,950
Other consumer \| Commercial real estate
Total consumer loans held for investment
2024	21,105
2023	64,307
2022	128,334
2021	91,470
2020	61,548
Prior	218,464
Revolving Loans	12,637
Total Loans Receivable	597,865
Other consumer \| Construction-custom & owner/builder
Total consumer loans held for investment
2024	21,701
2023	42,271
2022	6,807
2021	2,878
2020	432
Prior	436
Revolving Loans	0
Total Loans Receivable	74,525
Other consumer \| Construction-speculative one-to four-family
Total consumer loans held for investment
2024	3,468
2023	2,747
2022	0
2021	518
2020	0
Prior	0
Revolving Loans	0
Total Loans Receivable	6,733
Other consumer \| Construction-commercial
Total consumer loans held for investment
2024	991
2023	17,882
2022	1,045
2021	1,293
2020	0
Prior	0
Revolving Loans	0
Total Loans Receivable	21,211
Other consumer \| Construction-multi-family
Total consumer loans held for investment
2024	2,033
2023	18,249
2022	0
2021	0
2020	0
Prior	0
Revolving Loans	0
Total Loans Receivable	20,282
Other consumer \| Construction-land development
Total consumer loans held for investment
2024	1,903
2023	2,760
2022	11,918
2021	0
2020	0
Prior	0
Revolving Loans	0
Total Loans Receivable	16,581
Other consumer \| Land
Total consumer loans held for investment
2024	10,272
2023	5,740
2022	8,573
2021	4,085
2020	768
Prior	2,531
Revolving Loans	415
Total Loans Receivable	32,384
Other consumer \| Home equity
Total consumer loans held for investment
2024	3,434
2023	4,873
2022	2,017
2021	315
2020	707
Prior	2,380
Revolving Loans	29,953
Total Loans Receivable	43,679
Other consumer \| Other consumer
Total consumer loans held for investment
2024	1,657
2023	459
2022	247
2021	60
2020	14
Prior	600
Revolving Loans	84
Total Loans Receivable	3,121
Current period gross charge-off
2024	5,000
2023	1,000
2022	0
2021	0
2020	0
Prior	0
Revolving Loans	2,000
Total Loans Receivable	8,000
Other consumer \| Commercial business
Total consumer loans held for investment
2024	12,815
2023	22,084
2022	37,646
2021	9,474
2020	8,909
Prior	5,701
Revolving Loans	39,584
Total Loans Receivable	136,213
Current period gross charge-off
2024	0
2023	79,000
2022	0
2021	0
2020	0
Prior	0
Revolving Loans	0
Total Loans Receivable	79,000
Other consumer \| SBA PPP
Total consumer loans held for investment
2024	0
2023	0
2022	0
2021	267
2020	47
Prior	0
Revolving Loans	0
Total Loans Receivable	314
Other consumer \| Pass
Total consumer loans held for investment
2024	99,610
2023	252,840
2022	349,578
2021	190,130
2020	113,891
Prior	291,653
Revolving Loans	83,048
Total Loans Receivable	1,380,750
Other consumer \| Pass \| One-to four-family
Total consumer loans held for investment
2024	7,097
2023	54,350
2022	116,235
2021	49,399
2020	19,427
Prior	40,249
Revolving Loans	0
Total Loans Receivable	286,757
Other consumer \| Pass \| Multi-family
Total consumer loans held for investment
2024	13,134
2023	19,474
2022	39,836
2021	33,292
2020	27,002
Prior	44,042
Revolving Loans	1,170
Total Loans Receivable	177,950
Other consumer \| Pass \| Commercial real estate
Total consumer loans held for investment
2024	21,105
2023	64,307
2022	128,334
2021	91,470
2020	57,322
Prior	197,318
Revolving Loans	12,637
Total Loans Receivable	572,493
Other consumer \| Pass \| Construction-custom & owner/builder
Total consumer loans held for investment
2024	21,701
2023	42,271
2022	3,937
2021	0
2020	0
Prior	0
Revolving Loans	0
Total Loans Receivable	67,909
Other consumer \| Pass \| Construction-speculative one-to four-family
Total consumer loans held for investment
2024	3,468
2023	2,747
2022	0
2021	518
2020	0
Prior	0
Revolving Loans	0
Total Loans Receivable	6,733
Other consumer \| Pass \| Construction-commercial
Total consumer loans held for investment
2024	991
2023	16,914
2022	1,045
2021	1,293
2020	0
Prior	0
Revolving Loans	0
Total Loans Receivable	20,243
Other consumer \| Pass \| Construction-multi-family
Total consumer loans held for investment
2024	2,033
2023	18,249
2022	0
2021	0
2020	0
Prior	0
Revolving Loans	0
Total Loans Receivable	20,282
Other consumer \| Pass \| Construction-land development
Total consumer loans held for investment
2024	1,903
2023	2,760
2022	11,918
2021	0
2020	0
Prior	0
Revolving Loans	0
Total Loans Receivable	16,581
Other consumer \| Pass \| Land
Total consumer loans held for investment
2024	10,272
2023	5,740
2022	8,573
2021	4,085
2020	768
Prior	2,045
Revolving Loans	415
Total Loans Receivable	31,898
Other consumer \| Pass \| Home equity
Total consumer loans held for investment
2024	3,434
2023	4,873
2022	2,017
2021	315
2020	674
Prior	2,297
Revolving Loans	29,338
Total Loans Receivable	42,948
Other consumer \| Pass \| Other consumer
Total consumer loans held for investment
2024	1,657
2023	459
2022	247
2021	60
2020	14
Prior	543
Revolving Loans	84
Total Loans Receivable	3,064
Other consumer \| Pass \| Commercial business
Total consumer loans held for investment
2024	12,815
2023	20,696
2022	37,436
2021	9,431
2020	8,637
Prior	5,159
Revolving Loans	39,404
Total Loans Receivable	133,578
Other consumer \| Pass \| SBA PPP
Total consumer loans held for investment
2024	0
2023	0
2022	0
2021	267
2020	47
Prior	0
Revolving Loans	0
Total Loans Receivable	314
Other consumer \| Watch
Total consumer loans held for investment
2024	0
2023	2,768
2022	3,080
2021	2,769
2020	4,963
Prior	11,736
Revolving Loans	180
Total Loans Receivable	25,496
Other consumer \| Watch \| One-to four-family
Total consumer loans held for investment
2024	0
2023	1,800
2022	0
2021	0
2020	0
Prior	0
Revolving Loans	0
Total Loans Receivable	1,800
Other consumer \| Watch \| Commercial real estate
Total consumer loans held for investment
2024	0
2023	0
2022	0
2021	0
2020	4,226
Prior	10,747
Revolving Loans	0
Total Loans Receivable	14,973
Other consumer \| Watch \| Construction-custom & owner/builder
Total consumer loans held for investment
2024	0
2023	0
2022	2,870
2021	2,726
2020	432
Prior	436
Revolving Loans	0
Total Loans Receivable	6,464
Other consumer \| Watch \| Construction-commercial
Total consumer loans held for investment
2024	0
2023	968
2022	0
2021	0
2020	0
Prior	0
Revolving Loans	0
Total Loans Receivable	968
Other consumer \| Watch \| Land
Total consumer loans held for investment
2024	0
2023	0
2022	0
2021	0
2020	0
Prior	486
Revolving Loans	0
Total Loans Receivable	486
Other consumer \| Watch \| Home equity
Total consumer loans held for investment
2024	0
2023	0
2022	0
2021	0
2020	33
Prior	0
Revolving Loans	0
Total Loans Receivable	33
Other consumer \| Watch \| Other consumer
Total consumer loans held for investment
2024	0
2023	0
2022	0
2021	0
2020	0
Prior	57
Revolving Loans	0
Total Loans Receivable	57
Other consumer \| Watch \| Commercial business
Total consumer loans held for investment
2024	0
2023	0
2022	210
2021	43
2020	272
Prior	10
Revolving Loans	180
Total Loans Receivable	715
Other consumer \| Special Mention
Total consumer loans held for investment
2024	0
2023	0
2022	0
2021	0
2020	0
Prior	4,401
Revolving Loans	0
Total Loans Receivable	4,401
Other consumer \| Special Mention \| Commercial real estate
Total consumer loans held for investment
2024	0
2023	0
2022	0
2021	0
2020	0
Prior	4,401
Revolving Loans	0
Total Loans Receivable	4,401
Other consumer \| Substandard
Total consumer loans held for investment
2024	0
2023	1,186
2022	0
2021	152
2020	0
Prior	6,667
Revolving Loans	615
Total Loans Receivable	8,620
Other consumer \| Substandard \| One-to four-family
Total consumer loans held for investment
2024	0
2023	0
2022	0

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

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-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 1: http://www.xbrl.org/2003/role/exampleRef
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