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Loans Receivable - Loan Delinquencies by Loan Portfolio and Class (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Sep. 30, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 21,265,023	$ 21,120,107
% based on $, past due	0.30%	0.25%
Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 21,200,581	$ 21,066,769
% based on $, current	99.70%	99.75%
Total Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 64,442	$ 53,338
% based on $, past due	0.30%	0.25%
30 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 17,519	$ 6,644
% based on $, past due	0.09%	0.03%
60 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 12,453	$ 14,174
% based on $, past due	0.05%	0.07%
90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 34,470	$ 32,520
% based on $, past due	0.16%	0.15%
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 12,284,931	$ 12,205,420
% based on $, past due	0.25%	0.16%
Commercial loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 12,254,016	$ 12,185,916
Commercial loans | Total Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	30,915	19,504
Commercial loans | 30 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	9,505	1,019
Commercial loans | 60 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	5,833	5,913
Commercial loans | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	15,577	12,572
Commercial loans | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 4,740,797	$ 4,556,200
% based on $, past due	0.50%	0.32%
Commercial loans | Multi-family | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 4,717,293	$ 4,541,527
Commercial loans | Multi-family | Total Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	23,504	14,673
Commercial loans | Multi-family | 30 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	8,539	0
Commercial loans | Multi-family | 60 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	2,520	4,890
Commercial loans | Multi-family | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	12,445	9,783
Commercial loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 3,610,758	$ 3,732,155
% based on $, past due	0.02%	0.02%
Commercial loans | Commercial real estate | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 3,610,088	$ 3,731,494
Commercial loans | Commercial real estate | Total Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	670	661
Commercial loans | Commercial real estate | 30 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	88	89
Commercial loans | Commercial real estate | 60 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	34	0
Commercial loans | Commercial real estate | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	548	572
Commercial loans | Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 2,403,719	$ 2,332,732
% based on $, past due	0.09%	0.09%
Commercial loans | Commercial & industrial | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 2,401,473	$ 2,330,686
Commercial loans | Commercial & industrial | Total Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	2,246	2,046
Commercial loans | Commercial & industrial | 30 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	256	0
Commercial loans | Commercial & industrial | 60 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	30	1,023
Commercial loans | Commercial & industrial | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	1,960	1,023
Commercial loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 1,383,048	$ 1,424,016
% based on $, past due	0.33%	0.14%
Commercial loans | Construction | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 1,378,553	$ 1,421,966
Commercial loans | Construction | Total Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	4,495	2,050
Commercial loans | Construction | 30 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	622	930
Commercial loans | Construction | 60 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	3,249	0
Commercial loans | Construction | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	624	1,120
Commercial loans | Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 146,609	$ 160,317
% based on $, past due	0.00%	0.05%
Commercial loans | Land - acquisition & development | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 146,609	$ 160,243
Commercial loans | Land - acquisition & development | Total Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	0	74
Commercial loans | Land - acquisition & development | 30 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	0	0
Commercial loans | Land - acquisition & development | 60 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	0	0
Commercial loans | Land - acquisition & development | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	0	74
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 8,980,092	$ 8,914,687
% based on $, past due	0.37%	0.38%
Consumer loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 8,946,565	$ 8,880,853
Consumer loans | Total Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	33,527	33,834
Consumer loans | 30 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	8,014	5,625
Consumer loans | 60 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	6,620	8,261
Consumer loans | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	18,893	19,948
Consumer loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 155,714	$ 182,415
% based on $, past due	0.54%	0.46%
Consumer loans | Construction | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 154,866	$ 181,567
Consumer loans | Construction | Total Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	848	848
Consumer loans | Construction | 30 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	0	0
Consumer loans | Construction | 60 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	0	0
Consumer loans | Construction | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	848	848
Consumer loans | Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 8,362,881	$ 8,280,300
% based on $, past due	0.35%	0.36%
Consumer loans | Single-family residential | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 8,333,284	$ 8,250,589
Consumer loans | Single-family residential | Total Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	29,597	29,711
Consumer loans | Single-family residential | 30 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	6,639	3,927
Consumer loans | Single-family residential | 60 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	6,107	7,540
Consumer loans | Single-family residential | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	16,851	18,244
Consumer loans | Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 106,489	$ 108,060
% based on $, past due	0.31%	0.00%
Consumer loans | Land - consumer lot loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 106,156	$ 108,060
Consumer loans | Land - consumer lot loans | Total Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	333	0
Consumer loans | Land - consumer lot loans | 30 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	326	0
Consumer loans | Land - consumer lot loans | 60 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	0	0
Consumer loans | Land - consumer lot loans | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	7	0
Consumer loans | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 279,039	$ 269,857
% based on $, past due	0.73%	0.93%
Consumer loans | HELOC | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 277,002	$ 267,347
Consumer loans | HELOC | Total Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	2,037	2,510
Consumer loans | HELOC | 30 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	916	1,387
Consumer loans | HELOC | 60 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	383	577
Consumer loans | HELOC | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	738	546
Consumer loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 75,969	$ 74,055
% based on $, past due	0.94%	1.03%
Consumer loans | Consumer | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 75,257	$ 73,290
Consumer loans | Consumer | Total Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	712	765
Consumer loans | Consumer | 30 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	133	311
Consumer loans | Consumer | 60 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	130	144
Consumer loans | Consumer | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 449	$ 310

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481628/310-20-40-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

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