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Loans Receivable - Loan Delinquencies by Loan Portfolio and Class (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Sep. 30, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 21,122,710	$ 21,120,107
% based on $, past due	0.27%	0.25%
Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 21,064,763	$ 21,066,769
% based on $, current	99.73%	99.75%
Total Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 57,947	$ 53,338
% based on $, past due	0.27%	0.25%
30 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 27,427	$ 6,644
% based on $, past due	0.13%	0.03%
60 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 7,893	$ 14,174
% based on $, past due	0.03%	0.07%
90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 22,627	$ 32,520
% based on $, past due	0.11%	0.15%
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 12,238,959	$ 12,205,420
% based on $, past due	0.16%	0.16%
Commercial loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 12,219,865	$ 12,185,916
Commercial loans | Total Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	19,094	19,504
Commercial loans | 30 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	13,063	1,019
Commercial loans | 60 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	2,879	5,913
Commercial loans | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	3,152	12,572
Commercial loans | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 4,867,340	$ 4,556,200
% based on $, past due	0.31%	0.32%
Commercial loans | Multi-family | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 4,852,120	$ 4,541,527
Commercial loans | Multi-family | Total Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	15,220	14,673
Commercial loans | Multi-family | 30 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	12,068	0
Commercial loans | Multi-family | 60 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	0	4,890
Commercial loans | Multi-family | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	3,152	9,783
Commercial loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 3,639,477	$ 3,732,155
% based on $, past due	0.10%	0.02%
Commercial loans | Commercial real estate | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 3,635,656	$ 3,731,494
Commercial loans | Commercial real estate | Total Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	3,821	661
Commercial loans | Commercial real estate | 30 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	942	89
Commercial loans | Commercial real estate | 60 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	2,879	0
Commercial loans | Commercial real estate | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	0	572
Commercial loans | Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 2,384,745	$ 2,332,732
% based on $, past due	0.00%	0.09%
Commercial loans | Commercial & industrial | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 2,384,692	$ 2,330,686
Commercial loans | Commercial & industrial | Total Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	53	2,046
Commercial loans | Commercial & industrial | 30 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	53	0
Commercial loans | Commercial & industrial | 60 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	0	1,023
Commercial loans | Commercial & industrial | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	0	1,023
Commercial loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 1,211,336	$ 1,424,016
% based on $, past due	0.00%	0.14%
Commercial loans | Construction | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 1,211,336	$ 1,421,966
Commercial loans | Construction | Total Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	0	2,050
Commercial loans | Construction | 30 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	0	930
Commercial loans | Construction | 60 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	0	0
Commercial loans | Construction | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	0	1,120
Commercial loans | Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 136,061	$ 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	$ 136,061	$ 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	$ 8,883,751	$ 8,914,687
% based on $, past due	0.44%	0.38%
Consumer loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 8,844,898	$ 8,880,853
Consumer loans | Total Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	38,853	33,834
Consumer loans | 30 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	14,364	5,625
Consumer loans | 60 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	5,014	8,261
Consumer loans | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	19,475	19,948
Consumer loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 137,501	$ 182,415
% based on $, past due	0.62%	0.46%
Consumer loans | Construction | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 136,653	$ 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	$ 8,264,318	$ 8,280,300
% based on $, past due	0.42%	0.36%
Consumer loans | Single-family residential | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 8,230,006	$ 8,250,589
Consumer loans | Single-family residential | Total Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	34,312	29,711
Consumer loans | Single-family residential | 30 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	12,099	3,927
Consumer loans | Single-family residential | 60 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	4,047	7,540
Consumer loans | Single-family residential | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	18,166	18,244
Consumer loans | Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 101,784	$ 108,060
% based on $, past due	0.17%	0.00%
Consumer loans | Land - consumer lot loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 101,609	$ 108,060
Consumer loans | Land - consumer lot loans | Total Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	175	0
Consumer loans | Land - consumer lot loans | 30 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	168	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	$ 288,228	$ 269,857
% based on $, past due	0.98%	0.93%
Consumer loans | HELOC | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 285,393	$ 267,347
Consumer loans | HELOC | Total Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	2,835	2,510
Consumer loans | HELOC | 30 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	1,820	1,387
Consumer loans | HELOC | 60 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	761	577
Consumer loans | HELOC | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	254	546
Consumer loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 91,920	$ 74,055
% based on $, past due	0.74%	1.03%
Consumer loans | Consumer | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 91,237	$ 73,290
Consumer loans | Consumer | Total Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	683	765
Consumer loans | Consumer | 30 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	277	311
Consumer loans | Consumer | 60 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	206	144
Consumer loans | Consumer | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 200	$ 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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