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LOANS RECEIVABLE - Loans Receivable, Analysis of Age of Loans in Past Due Status (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 20,288,338	$ 21,120,107
% based on $, past due	0.60%	0.25%
Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 20,165,753	$ 21,066,769
Delinquency %, current	99.40%	99.75%
Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 122,585	$ 53,338
% based on $, past due	0.60%	0.25%
30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 18,558	$ 6,644
% based on $, past due	0.09%	0.03%
60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 21,204	$ 14,174
% based on $, past due	0.10%	0.07%
90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 82,823	$ 32,520
% based on $, past due	0.41%	0.15%
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 11,851,657	$ 12,205,420
% based on $, past due	0.61%	0.16%
Commercial loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 11,778,787	$ 12,185,916
Commercial loans | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	72,870	19,504
Commercial loans | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	139	1,019
Commercial loans | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	14,482	5,913
Commercial loans | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	58,249	12,572
Commercial loans | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 4,631,321	$ 4,556,200
% based on $, past due	0.45%	0.32%
Commercial loans | Multi-family | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 4,610,677	$ 4,541,527
Commercial loans | Multi-family | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	20,644	14,673
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	12,482	4,890
Commercial loans | Multi-family | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	8,162	9,783
Commercial loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 3,588,950	$ 3,732,155
% based on $, past due	1.42%	0.02%
Commercial loans | Commercial real estate | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 3,537,909	$ 3,731,494
Commercial loans | Commercial real estate | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	51,041	661
Commercial loans | Commercial real estate | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	87	89
Commercial loans | Commercial real estate | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	912	0
Commercial loans | Commercial real estate | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	50,042	572
Commercial loans | Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 2,386,363	$ 2,332,732
% based on $, past due	0.05%	0.09%
Commercial loans | Commercial & industrial | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 2,385,178	$ 2,330,686
Commercial loans | Commercial & industrial | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	1,185	2,046
Commercial loans | Commercial & industrial | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	52	0
Commercial loans | Commercial & industrial | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	1,088	1,023
Commercial loans | Commercial & industrial | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	45	1,023
Commercial loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 1,105,101	$ 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, net of loans in process	$ 1,105,101	$ 1,421,966
Commercial loans | Construction | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	0	2,050
Commercial loans | Construction | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	0	930
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	0	1,120
Commercial loans | Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 139,922	$ 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, net of loans in process	$ 139,922	$ 160,243
Commercial loans | Land - acquisition & development | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	0	74
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	0	74
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 8,436,681	$ 8,914,687
% based on $, past due	0.59%	0.38%
Consumer loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 8,386,966	$ 8,880,853
Consumer loans | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	49,715	33,834
Consumer loans | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	18,419	5,625
Consumer loans | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	6,722	8,261
Consumer loans | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	24,574	19,948
Consumer loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 78,243	$ 182,415
% based on $, past due	0.97%	0.46%
Consumer loans | Construction | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 77,483	$ 181,567
Consumer loans | Construction | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	760	848
Consumer loans | Construction | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	0	0
Consumer loans | Construction | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	0	0
Consumer loans | Construction | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	760	848
Consumer loans | Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 7,936,931	$ 8,280,300
% based on $, past due	0.58%	0.36%
Consumer loans | Single-family residential | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 7,890,843	$ 8,250,589
Consumer loans | Single-family residential | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	46,088	29,711
Consumer loans | Single-family residential | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	16,639	3,927
Consumer loans | Single-family residential | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	6,176	7,540
Consumer loans | Single-family residential | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	23,273	18,244
Consumer loans | Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 88,696	$ 108,060
% based on $, past due	0.37%	0.00%
Consumer loans | Land - consumer lot loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 88,364	$ 108,060
Consumer loans | Land - consumer lot loans | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	332	0
Consumer loans | Land - consumer lot loans | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	249	0
Consumer loans | Land - consumer lot loans | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	60	0
Consumer loans | Land - consumer lot loans | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	23	0
Consumer loans | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 271,286	$ 269,857
% based on $, past due	0.80%	0.93%
Consumer loans | HELOC | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 269,104	$ 267,347
Consumer loans | HELOC | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	2,182	2,510
Consumer loans | HELOC | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	1,432	1,387
Consumer loans | HELOC | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	384	577
Consumer loans | HELOC | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	366	546
Consumer loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 61,525	$ 74,055
% based on $, past due	0.57%	1.03%
Consumer loans | Consumer | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 61,172	$ 73,290
Consumer loans | Consumer | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	353	765
Consumer loans | Consumer | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	99	311
Consumer loans | Consumer | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	102	144
Consumer loans | Consumer | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 152	$ 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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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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