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Loans Receivable - Loan Delinquencies by Loan Portfolio and Class (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Sep. 30, 2024
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 21,122,710 | $ 21,120,107
% based on $, past due | 0.27% | 0.25%
Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 21,064,763 | $ 21,066,769
% based on $, current | 99.73% | 99.75%
Total Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 57,947 | $ 53,338
% based on $, past due | 0.27% | 0.25%
30 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 27,427 | $ 6,644
% based on $, past due | 0.13% | 0.03%
60 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 7,893 | $ 14,174
% based on $, past due | 0.03% | 0.07%
90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 22,627 | $ 32,520
% based on $, past due | 0.11% | 0.15%
Commercial loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 12,238,959 | $ 12,205,420
% based on $, past due | 0.16% | 0.16%
Commercial loans | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 12,219,865 | $ 12,185,916
Commercial loans | Total Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 19,094 | 19,504
Commercial loans | 30 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 13,063 | 1,019
Commercial loans | 60 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 2,879 | 5,913
Commercial loans | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 3,152 | 12,572
Commercial loans | Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 4,867,340 | $ 4,556,200
% based on $, past due | 0.31% | 0.32%
Commercial loans | Multi-family | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 4,852,120 | $ 4,541,527
Commercial loans | Multi-family | Total Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 15,220 | 14,673
Commercial loans | Multi-family | 30 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 12,068 | 0
Commercial loans | Multi-family | 60 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 0 | 4,890
Commercial loans | Multi-family | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 3,152 | 9,783
Commercial loans | Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 3,639,477 | $ 3,732,155
% based on $, past due | 0.10% | 0.02%
Commercial loans | Commercial real estate | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 3,635,656 | $ 3,731,494
Commercial loans | Commercial real estate | Total Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 3,821 | 661
Commercial loans | Commercial real estate | 30 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 942 | 89
Commercial loans | Commercial real estate | 60 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 2,879 | 0
Commercial loans | Commercial real estate | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 0 | 572
Commercial loans | Commercial & industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 2,384,745 | $ 2,332,732
% based on $, past due | 0.00% | 0.09%
Commercial loans | Commercial & industrial | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 2,384,692 | $ 2,330,686
Commercial loans | Commercial & industrial | Total Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 53 | 2,046
Commercial loans | Commercial & industrial | 30 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 53 | 0
Commercial loans | Commercial & industrial | 60 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 0 | 1,023
Commercial loans | Commercial & industrial | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 0 | 1,023
Commercial loans | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 1,211,336 | $ 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 | $ 1,211,336 | $ 1,421,966
Commercial loans | Construction | Total Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 0 | 2,050
Commercial loans | Construction | 30 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 0 | 930
Commercial loans | Construction | 60 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 0 | 0
Commercial loans | Construction | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 0 | 1,120
Commercial loans | Land - acquisition & development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 136,061 | $ 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 | $ 136,061 | $ 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 | $ 8,883,751 | $ 8,914,687
% based on $, past due | 0.44% | 0.38%
Consumer loans | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 8,844,898 | $ 8,880,853
Consumer loans | Total Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 38,853 | 33,834
Consumer loans | 30 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 14,364 | 5,625
Consumer loans | 60 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 5,014 | 8,261
Consumer loans | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 19,475 | 19,948
Consumer loans | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 137,501 | $ 182,415
% based on $, past due | 0.62% | 0.46%
Consumer loans | Construction | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 136,653 | $ 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 | $ 8,264,318 | $ 8,280,300
% based on $, past due | 0.42% | 0.36%
Consumer loans | Single-family residential | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 8,230,006 | $ 8,250,589
Consumer loans | Single-family residential | Total Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 34,312 | 29,711
Consumer loans | Single-family residential | 30 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 12,099 | 3,927
Consumer loans | Single-family residential | 60 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 4,047 | 7,540
Consumer loans | Single-family residential | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 18,166 | 18,244
Consumer loans | Land - consumer lot loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 101,784 | $ 108,060
% based on $, past due | 0.17% | 0.00%
Consumer loans | Land - consumer lot loans | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 101,609 | $ 108,060
Consumer loans | Land - consumer lot loans | Total Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 175 | 0
Consumer loans | Land - consumer lot loans | 30 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 168 | 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 | $ 288,228 | $ 269,857
% based on $, past due | 0.98% | 0.93%
Consumer loans | HELOC | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 285,393 | $ 267,347
Consumer loans | HELOC | Total Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 2,835 | 2,510
Consumer loans | HELOC | 30 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 1,820 | 1,387
Consumer loans | HELOC | 60 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 761 | 577
Consumer loans | HELOC | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 254 | 546
Consumer loans | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 91,920 | $ 74,055
% based on $, past due | 0.74% | 1.03%
Consumer loans | Consumer | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 91,237 | $ 73,290
Consumer loans | Consumer | Total Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 683 | 765
Consumer loans | Consumer | 30 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 277 | 311
Consumer loans | Consumer | 60 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 206 | 144
Consumer loans | Consumer | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 200 | $ 310

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