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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
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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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