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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
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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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