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Loans Receivable - Loans Receivable, Analysis of Age of Loans in Past Due Status (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 21,120,107	$ 17,653,757
% based on $, past due	0.25%	0.36%
Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 21,066,769	$ 17,590,442
Delinquency %, current	99.75%	99.64%
Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 53,338	$ 63,315
% based on $, past due	0.25%	0.36%
30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 6,644	$ 9,715
% based on $, past due	0.03%	0.06%
60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 14,174	$ 11,682
% based on $, past due	0.07%	0.07%
90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 32,520	$ 41,918
% based on $, past due	0.15%	0.24%
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 12,205,420	$ 10,507,610
% based on $, past due	0.16%	0.31%
Commercial loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 12,185,916	$ 10,474,752
Commercial loans | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	19,504	32,858
Commercial loans | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	1,019	878
Commercial loans | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	5,913	2,331
Commercial loans | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	12,572	29,649
Commercial loans | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 4,556,200	$ 2,886,594
% based on $, past due	0.32%	0.00%
Commercial loans | Multi-family | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 4,541,527	$ 2,886,462
Commercial loans | Multi-family | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	14,673	132
Commercial loans | Multi-family | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	0	0
Commercial loans | Multi-family | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	4,890	0
Commercial loans | Multi-family | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	9,783	132
Commercial loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 3,732,155	$ 3,310,101
% based on $, past due	0.02%	0.74%
Commercial loans | Commercial real estate | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 3,731,494	$ 3,285,673
Commercial loans | Commercial real estate | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	661	24,428
Commercial loans | Commercial real estate | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	89	848
Commercial loans | Commercial real estate | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	0	145
Commercial loans | Commercial real estate | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	572	23,435
Commercial loans | Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 2,332,732	$ 2,315,318
% based on $, past due	0.09%	0.36%
Commercial loans | Commercial & industrial | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 2,330,686	$ 2,307,020
Commercial loans | Commercial & industrial | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	2,046	8,298
Commercial loans | Commercial & industrial | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	0	30
Commercial loans | Commercial & industrial | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	1,023	2,186
Commercial loans | Commercial & industrial | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	1,023	6,082
Commercial loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 1,424,016	$ 1,838,936
% based on $, past due	0.14%	0.00%
Commercial loans | Construction | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 1,421,966	$ 1,838,936
Commercial loans | Construction | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	2,050	0
Commercial loans | Construction | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	930	0
Commercial loans | Construction | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	0	0
Commercial loans | Construction | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	1,120	0
Commercial loans | Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 160,317	$ 156,661
% based on $, past due	0.05%	0.00%
Commercial loans | Land - acquisition & development | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 160,243	$ 156,661
Commercial loans | Land - acquisition & development | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	74	0
Commercial loans | Land - acquisition & development | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	0	0
Commercial loans | Land - acquisition & development | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	0	0
Commercial loans | Land - acquisition & development | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	74	0
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 8,914,687	$ 7,146,147
% based on $, past due	0.38%	0.43%
Consumer loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 8,880,853	$ 7,115,690
Consumer loans | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	33,834	30,457
Consumer loans | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	5,625	8,837
Consumer loans | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	8,261	9,351
Consumer loans | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	19,948	12,269
Consumer loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 182,415	$ 324,451
% based on $, past due	0.46%	1.07%
Consumer loans | Construction | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 181,567	$ 320,987
Consumer loans | Construction | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	848	3,464
Consumer loans | Construction | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	0	760
Consumer loans | Construction | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	0	2,617
Consumer loans | Construction | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	848	87
Consumer loans | Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 8,280,300	$ 6,388,990
% based on $, past due	0.36%	0.37%
Consumer loans | Single-family residential | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 8,250,589	$ 6,365,065
Consumer loans | Single-family residential | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	29,711	23,925
Consumer loans | Single-family residential | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	3,927	6,441
Consumer loans | Single-family residential | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	7,540	6,068
Consumer loans | Single-family residential | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	18,244	11,416
Consumer loans | Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 108,060	$ 124,842
% based on $, past due	0.00%	0.49%
Consumer loans | Land - consumer lot loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 108,060	$ 124,231
Consumer loans | Land - consumer lot loans | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	0	611
Consumer loans | Land - consumer lot loans | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	0	358
Consumer loans | Land - consumer lot loans | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	0	245
Consumer loans | Land - consumer lot loans | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	0	8
Consumer loans | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 269,857	$ 237,754
% based on $, past due	0.93%	0.86%
Consumer loans | HELOC | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 267,347	$ 235,708
Consumer loans | HELOC | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	2,510	2,046
Consumer loans | HELOC | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	1,387	1,050
Consumer loans | HELOC | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	577	314
Consumer loans | HELOC | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	546	682
Consumer loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 74,055	$ 70,110
% based on $, past due	1.03%	0.59%
Consumer loans | Consumer | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 73,290	$ 69,699
Consumer loans | Consumer | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	765	411
Consumer loans | Consumer | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	311	228
Consumer loans | Consumer | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	144	107
Consumer loans | Consumer | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 310	$ 76

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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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