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Loans Receivable - Loan Delinquencies by Loan Portfolio and Class (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 21,265,023 | $ 21,120,107
% based on $, past due | 0.30% | 0.25%
Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 21,200,581 | $ 21,066,769
% based on $, current | 99.70% | 99.75%
Total Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 64,442 | $ 53,338
% based on $, past due | 0.30% | 0.25%
30 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 17,519 | $ 6,644
% based on $, past due | 0.09% | 0.03%
60 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 12,453 | $ 14,174
% based on $, past due | 0.05% | 0.07%
90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 34,470 | $ 32,520
% based on $, past due | 0.16% | 0.15%
Commercial loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 12,284,931 | $ 12,205,420
% based on $, past due | 0.25% | 0.16%
Commercial loans | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 12,254,016 | $ 12,185,916
Commercial loans | Total Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 30,915 | 19,504
Commercial loans | 30 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 9,505 | 1,019
Commercial loans | 60 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 5,833 | 5,913
Commercial loans | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 15,577 | 12,572
Commercial loans | Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 4,740,797 | $ 4,556,200
% based on $, past due | 0.50% | 0.32%
Commercial loans | Multi-family | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 4,717,293 | $ 4,541,527
Commercial loans | Multi-family | Total Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 23,504 | 14,673
Commercial loans | Multi-family | 30 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 8,539 | 0
Commercial loans | Multi-family | 60 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 2,520 | 4,890
Commercial loans | Multi-family | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 12,445 | 9,783
Commercial loans | Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 3,610,758 | $ 3,732,155
% based on $, past due | 0.02% | 0.02%
Commercial loans | Commercial real estate | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 3,610,088 | $ 3,731,494
Commercial loans | Commercial real estate | Total Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 670 | 661
Commercial loans | Commercial real estate | 30 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 88 | 89
Commercial loans | Commercial real estate | 60 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 34 | 0
Commercial loans | Commercial real estate | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 548 | 572
Commercial loans | Commercial & industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 2,403,719 | $ 2,332,732
% based on $, past due | 0.09% | 0.09%
Commercial loans | Commercial & industrial | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 2,401,473 | $ 2,330,686
Commercial loans | Commercial & industrial | Total Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 2,246 | 2,046
Commercial loans | Commercial & industrial | 30 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 256 | 0
Commercial loans | Commercial & industrial | 60 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 30 | 1,023
Commercial loans | Commercial & industrial | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 1,960 | 1,023
Commercial loans | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 1,383,048 | $ 1,424,016
% based on $, past due | 0.33% | 0.14%
Commercial loans | Construction | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 1,378,553 | $ 1,421,966
Commercial loans | Construction | Total Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 4,495 | 2,050
Commercial loans | Construction | 30 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 622 | 930
Commercial loans | Construction | 60 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 3,249 | 0
Commercial loans | Construction | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 624 | 1,120
Commercial loans | Land - acquisition & development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 146,609 | $ 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 | $ 146,609 | $ 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 | $ 8,980,092 | $ 8,914,687
% based on $, past due | 0.37% | 0.38%
Consumer loans | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 8,946,565 | $ 8,880,853
Consumer loans | Total Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 33,527 | 33,834
Consumer loans | 30 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 8,014 | 5,625
Consumer loans | 60 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 6,620 | 8,261
Consumer loans | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 18,893 | 19,948
Consumer loans | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 155,714 | $ 182,415
% based on $, past due | 0.54% | 0.46%
Consumer loans | Construction | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 154,866 | $ 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 | $ 8,362,881 | $ 8,280,300
% based on $, past due | 0.35% | 0.36%
Consumer loans | Single-family residential | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 8,333,284 | $ 8,250,589
Consumer loans | Single-family residential | Total Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 29,597 | 29,711
Consumer loans | Single-family residential | 30 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 6,639 | 3,927
Consumer loans | Single-family residential | 60 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 6,107 | 7,540
Consumer loans | Single-family residential | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 16,851 | 18,244
Consumer loans | Land - consumer lot loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 106,489 | $ 108,060
% based on $, past due | 0.31% | 0.00%
Consumer loans | Land - consumer lot loans | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 106,156 | $ 108,060
Consumer loans | Land - consumer lot loans | Total Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 333 | 0
Consumer loans | Land - consumer lot loans | 30 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 326 | 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 | $ 279,039 | $ 269,857
% based on $, past due | 0.73% | 0.93%
Consumer loans | HELOC | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 277,002 | $ 267,347
Consumer loans | HELOC | Total Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 2,037 | 2,510
Consumer loans | HELOC | 30 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 916 | 1,387
Consumer loans | HELOC | 60 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 383 | 577
Consumer loans | HELOC | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 738 | 546
Consumer loans | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 75,969 | $ 74,055
% based on $, past due | 0.94% | 1.03%
Consumer loans | Consumer | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 75,257 | $ 73,290
Consumer loans | Consumer | Total Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 712 | 765
Consumer loans | Consumer | 30 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 133 | 311
Consumer loans | Consumer | 60 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 130 | 144
Consumer loans | Consumer | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 449 | $ 310

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