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Loans Receivable - Loan Delinquencies by Loan Portfolio and Class (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 21,077,743 | $ 17,653,757
% based on $, past due | 0.22% | 0.36%
Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 21,031,022 | $ 17,590,442
% based on $, current | 99.78% | 99.64%
Total Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 46,721 | $ 63,315
% based on $, past due | 0.22% | 0.36%
30 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 13,432 | $ 9,715
% based on $, past due | 0.06% | 0.06%
60 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 9,036 | $ 11,682
% based on $, past due | 0.04% | 0.07%
90 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 24,253 | $ 41,918
% based on $, past due | 0.12% | 0.24%
Commercial loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 12,246,080 | $ 10,507,610
% based on $, past due | 0.09% | 0.31%
Commercial loans | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 12,235,547 | $ 10,474,752
Commercial loans | Total Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 10,533 | 32,858
Commercial loans | 30 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 0 | 878
Commercial loans | 60 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 3,600 | 2,331
Commercial loans | 90 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 6,933 | 29,649
Commercial loans | Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 4,513,323 | $ 2,886,594
% based on $, past due | 0.15% | 0.00%
Commercial loans | Multi-family | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 4,506,711 | $ 2,886,462
Commercial loans | Multi-family | Total Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 6,612 | 132
Commercial loans | Multi-family | 30 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 0 | 0
Commercial loans | Multi-family | 60 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 2,651 | 0
Commercial loans | Multi-family | 90 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 3,961 | 132
Commercial loans | Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 3,746,945 | $ 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 | $ 3,746,356 | $ 3,285,673
Commercial loans | Commercial real estate | Total Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 589 | 24,428
Commercial loans | Commercial real estate | 30 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 0 | 848
Commercial loans | Commercial real estate | 60 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 589 | 145
Commercial loans | Commercial real estate | 90 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 0 | 23,435
Commercial loans | Commercial & industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 2,389,236 | $ 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 | $ 2,387,098 | $ 2,307,020
Commercial loans | Commercial & industrial | Total Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 2,138 | 8,298
Commercial loans | Commercial & industrial | 30 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 0 | 30
Commercial loans | Commercial & industrial | 60 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 0 | 2,186
Commercial loans | Commercial & industrial | 90 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 2,138 | 6,082
Commercial loans | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 1,440,152 | $ 1,838,936
% based on $, past due | 0.08% | 0.00%
Commercial loans | Construction | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 1,439,032 | $ 1,838,936
Commercial loans | Construction | Total Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 1,120 | 0
Commercial loans | Construction | 30 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 0 | 0
Commercial loans | Construction | 60 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 360 | 0
Commercial loans | Construction | 90 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 760 | 0
Commercial loans | Land - acquisition & development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 156,424 | $ 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 | $ 156,350 | $ 156,661
Commercial loans | Land - acquisition & development | Total Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 74 | 0
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 past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 74 | 0
Consumer loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 8,831,663 | $ 7,146,147
% based on $, past due | 0.41% | 0.43%
Consumer loans | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 8,795,475 | $ 7,115,690
Consumer loans | Total Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 36,188 | 30,457
Consumer loans | 30 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 13,432 | 8,837
Consumer loans | 60 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 5,436 | 9,351
Consumer loans | 90 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 17,320 | 12,269
Consumer loans | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 190,433 | $ 324,451
% based on $, past due | 0.45% | 1.07%
Consumer loans | Construction | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 189,585 | $ 320,987
Consumer loans | Construction | Total Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 848 | 3,464
Consumer loans | Construction | 30 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 760 | 760
Consumer loans | Construction | 60 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 0 | 2,617
Consumer loans | Construction | 90 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 88 | 87
Consumer loans | Single-family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 8,186,361 | $ 6,388,990
% based on $, past due | 0.39% | 0.37%
Consumer loans | Single-family residential | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 8,154,250 | $ 6,365,065
Consumer loans | Single-family residential | Total Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 32,111 | 23,925
Consumer loans | Single-family residential | 30 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 10,925 | 6,441
Consumer loans | Single-family residential | 60 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 4,937 | 6,068
Consumer loans | Single-family residential | 90 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 16,249 | 11,416
Consumer loans | Land - consumer lot loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 111,574 | $ 124,842
% based on $, past due | 0.63% | 0.49%
Consumer loans | Land - consumer lot loans | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 110,871 | $ 124,231
Consumer loans | Land - consumer lot loans | Total Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 703 | 611
Consumer loans | Land - consumer lot loans | 30 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 254 | 358
Consumer loans | Land - consumer lot loans | 60 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 213 | 245
Consumer loans | Land - consumer lot loans | 90 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 236 | 8
Consumer loans | HELOC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 258,833 | $ 237,754
% based on $, past due | 0.87% | 0.86%
Consumer loans | HELOC | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 256,582 | $ 235,708
Consumer loans | HELOC | Total Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 2,251 | 2,046
Consumer loans | HELOC | 30 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 1,366 | 1,050
Consumer loans | HELOC | 60 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 178 | 314
Consumer loans | HELOC | 90 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 707 | 682
Consumer loans | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 84,462 | $ 70,110
% based on $, past due | 0.33% | 0.59%
Consumer loans | Consumer | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 84,187 | $ 69,699
Consumer loans | Consumer | Total Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 275 | 411
Consumer loans | Consumer | 30 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 127 | 228
Consumer loans | Consumer | 60 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 108 | 107
Consumer loans | Consumer | 90 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 40 | $ 76

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